Born: 25 July 1896, Clifton Road, Rugby, Warwickshire, England
Entered: 08 September 1913, St Stanislaus College, Tullabeg, County Offaly
Ordained: 31 July 1928, Milltown Park, Dublin
Final Vows: 15 August 1932
Died: 14 October 1982, Borgo Santo Spirito, Rome, Italy

Transcribed : HIB to ASL 05 April 1931

Father was a Surveyor in Custons & Excise and died in 1913. His mother died in 1907. After parents death his father had appointed his uncle D O’Connell of Eccles Street, Dublin and aunt Miss J Kelly as guardians.

Eldest of one sister and two brothers.

Early education initially and a private school and a convent school in London, he was sent to St Aloysius College, Hornsey Lane, Highgate, London for two years. In 1907-1908 he received private tuition in Leicester. He then got an Entrance Scholarship to St Flannan’s College in Ennis. In 1911 he went to Clongowes Wood College SJ

by 1921 at Valkenburg Netherlands (GER) studying
by 1924 in Australia - Regency

◆ Australian Dictionary of Biography, National Centre of Biography, Australian National University online :
O'Connell, Daniel Joseph Kelly (1896–1982)
by Nick Lomb
Nick Lomb, 'O'Connell, Daniel Joseph Kelly (1896–1982)', Australian Dictionary of Biography, National Centre of Biography, Australian National University, http://adb.anu.edu.au/biography/oconnell-daniel-joseph-kelly-15389/text26596, published first in hardcopy 2012

astronomer; Catholic priest; seismologist

Died : 14 October 1982, Rome, Italy

Daniel Joseph Kelly O’Connell (1896-1982), Jesuit priest, astronomer and seismologist, was born on 25 July 1896 at Rugby, England, one of four children of Irish-born Daniel O’Connell (d.1905), Inland Revenue officer, and his English wife Rosa Susannah Helena, née Kelly (d.1907). Soon after the death of his mother, Daniel was sent to Clongowes Wood College, Dublin. At 17 he joined the Society of Jesus at Tullabeg and in 1915 entered his juniorate at Rathfarnham Castle. He majored in experimental physics and mathematics at University College, Dublin (B.Sc., 1919; M.Sc., 1920; D.Sc., 1949, National University of Ireland). Subsequently he studied philosophy at St Ignatius’ College, Valkenburg, the Netherlands, where he began watching variable stars, especially eclipsing binaries that were to become the main focus of his astronomical research.

O’Connell planned to attend the University of Cambridge but, due to a lung condition, he was advised to leave Britain. In 1922 he arrived at St Ignatius’ College, Riverview, Sydney; he did his regency, taught physics and the next year became assistant-director at the college’s observatory. He returned to Ireland in 1926 to complete his theological studies at Milltown Park, Dublin. Ordained on 31 July 1928, he undertook his tertianship at St Bueno’s College, Wales. In 1931 he travelled to Cambridge, Massachusetts, United States of America, to study at the Harvard College Observatory with Harlow Shapley.

Back at Riverview Observatory in 1933, O’Connell became director in 1938. At the observatory his research included seismology and the measurement of time with various kinds of clocks, as well as astronomy in the field of variable stars using the newly developed technique of photographic photometry. In 1935 he was elected a fellow of the Royal Astronomical Society and a member of the Royal Society of New South Wales; he served on the RSNSW council (1946-49) and as vice-president (1950-52), and became an honorary member in 1953. He was chairman from 1946 of the board of visitors of Sydney Observatory. One of the friendships he established while in Australia was with (Sir) Richard Woolley, director of Mount Stromlo Observatory. O’Connell presented radio talks, including a series of three titled ‘According to Hoyle’ on the Australian Broadcasting Commission station 2BL-2NC in March and April 1952.

That year O’Connell was called to Rome as director of the Vatican Observatory. On 26 July he left Australia, arriving in time for the Rome meeting of the International Astronomical Union. He continued his work on eclipsing binary stars, again using photoelectric photometry. A leading expert in the field, he was president (1955-61) of the commission on photometric double stars of the IAU. He published The Green Flash and Other Low Sun Phenomena (1958), which included colour photographs proving that the phenomenon, sometimes seen at sunrise or sunset, was real and not subjective.

At the Vatican Observatory O’Connell built up the staff and installed a 60/90-cm Schmidt telescope that became the observatory’s largest instrument. As objective prisms were available, the telescope was used for spectroscopy. With leading scientists he organised two study weeks—one on stellar populations in 1957 and another on nuclei of galaxies in 1970—and published the proceedings. He had personal friendships with three popes, especially Pope Pius XII. In 1970 he retired from his observatory post but continued as president (1968-72) of the Pontifical Academy of Sciences.

O’Connell died on 14 October 1982 at the headquarters of the Society of Jesus in Rome. He is remembered mainly for his work on eclipsing binary stars and the ‘O’Connell effect’ that relates to the rotation of the major axis of the elliptical orbit of a double star.

Select Bibliography
D. Strong, The Australian Dictionary of Jesuit Biography 1848-1998 (1999)
Irish Astronomical Journal, vol 15, no 4, 1982, p 347
D. O’Connell personal file (Society of Jesus, Australian Province Archives, Melbourne)

◆ David Strong SJ “The Australian Dictionary of Jesuit Biography 1848-2015”, 2nd Edition, Halstead Press, Ultimo NSW, Australia, 2017 - ISBN : 9781925043280
Daniel O'Connell's secondary education was at Clongowes College, Dublin. He entered the Society at Tullabeg, Ireland, 8 September 1913, and juniorate followed at Rathfarnham, 1915-20. He received his diploma in experimental physics and a Master of Science in mathematics at the University of Dublin, and later a doctorate in science from the Irish National University At this time he came under the influence of William O'Leary, the Irish Jesuit astronomer and seismologist, who at that time was director of Rathfarnham Castle Observatory in Dublin.
O’Connell then studied philosophy at Valkenburg, 1920-22, and did further tertiary studies in science, gaining first class honours in most subjects. It was while in Holland that he also pursued spare time astronomical studies under world famous Jesuit scientists like Michael Esch, expert on variable stars, Xavier Kugler, world authority on Assyriology and Babylonian astronomy; and Theodor Wulf world ranking physicist.
Regency followed as assistant director of the Riverview observatory, 1922-26, as well as physics master and second division prefect. At this time he undertook to advance the local study of solar radiation.
He went to theology at Milltown Park, Dublin 1926-29, and to tertianship at St Beuno's, Wales.
O'Connell studied from 1931-33 at Harvard College Observatory, Cambridge, Massachusetts, and was subsequently to have studied with the famous Sir Arthur Eddington. However, because of a lung condition, he returned to Australia, and then worked first as assistant director and later as director of the Riverview observatory 1933-52. Then he was appointed moderator of the Vatican Observatory at Castel Gandolfo, Rome, 1953-70. He lived in the Jesuit Curia, Rome, and from 1974 was due president emeritus of the Pontifical Academy of Sciences.
During the years that O'Connell was at Harvard, the observatory was at the centre of major developments in astronomical research and especially those that were to lead within
the next few decades to the notion of the expanding universe of galaxies. He was thus associated with such eminent astronomers as Harlow Shapley, Cecilia Payne Gaposhkin, and others. His principal occupation at Harvard, and a pursuit which continued for the rest of his life, was the study of variable stars; but he also became known as a keen card player, especially bridge.
On his way back to Australia he visited Mount Wilson and Lick observatories in California, and then went to Japan, China, Java and the Philippines, where he visited leading observatories and advanced his practical studies.
While at the Riverview Observatory, working under William O'Leary, and in addition to his study of variable stars, he developed a keen interest in seismology and in the measurement of time with various types of clocks. This latter focus led him into a lifelong interest in the calendar and calendar reform, a study that served him well in later decades since he was asked to advise popes on both calendar reform and the cycle of ecclesiastical feasts.
In 1935 he initiated the “Riverview Observatory Publications” which enjoyed international reputation. Later, he founded the “Reprint Series” and the “Geophysical Papers” that became also well known. In the field of astronomy, O'Connell worked on eclipsing stars and Cepheid variables For the latter he used photo-electric equipment. About 15 ,000 plates on variable stars were on file at the observatory.
In the field of seismology the observatory's programme included the regional study of earthquake waves and the relationship between earthquake waves and the interior of the earth
During World War II, O'Connell collaborated with the United States government in the location of earthquakes in the Pacific zone in relation to war strategy. This work continued after the war. Each week a cabled report was sent to the United States from Riverview. The Imperial War Graves Commission also consulted him concerning possible earthquake damage to war cemetery sites in the Pacific area.
In his role as director of the Vatican Observatory, he began a career of unique service to the Church that spanned the reign of three popes, and saw immense developments in astronomical research from the initial concept of various stellar populations to an expanding universe containing active galactic nuclei and quasars. On a few occasions he organised study weeks of the Pontifical Academy of Sciences, at which these subjects were discussed, e.g. Stellar Populations in 1957, and Nuclei of Galaxies in 1970. As a result of these study weeks, two books were published, both edited by O'Connell, and they became classics of astronomical literature. From 1955-61 he was president of the Commission on Double Stars of the International Astronomical Union.
Of his many contacts with popes he served, his relationship with Pius XII was especially close. He frequently advised the Pope, himself a very keen and diligent student of the natural sciences, on topics of current scientific research. In was under Pius XII that the major modern research tool of the Vatican Observatory, the Schmidt telescope, planned under his predecessors but completed under O'Connell, was inaugurated and blessed. Pius XII often visited the observatory, and on one occasion viewed the launching of the Russian Sputnik.
Paul VI viewed the landing of the first man on the Moon with O'Connell over a specially installed television, and he advised the Pope on the technical details of the mission.
In the pursuit of his scientific research, O'Connell became a close friend and collaborator of an international community of astronomers. As director of the Riverview Observatory he went to Europe in 1948 to attend the first post-war meeting of the International Astronomical Union held at Zurich, and on that occasion visited many European observatories. His visit to Utrecht was noteworthy, for there he established a lifelong friendship with Professor Marcel Minnaert who later encouraged him to issue the now famous book on the Green Flash, which, published in collaboration with Brother Karl Trench SJ, provides excellent documentation on optical effects that occur in the Earth's atmosphere when the sun is rising or setting.
However, O'Connell was best known in the international community of astronomers for his research on double stars. He discovered an effect, since known as the “O'Connell Effect”,
concerning the rotation of the line of the apsides (the major aids of the double star's ellipticalorbit). The discovery of this effect was typical of the scientific work of O'Connell. lt required a long period of painstaking observations and careful analyses over many years.
In addition to his membership in the academies and institutes already mentioned, O’Connell was a member of the National Research Council of Australia, and an honorary member of the Royal Irish Academy He was also a member of the Royal Society of New South Wales, publishing three papers on earthquakes and the Galitzin seismograph. He served on council, 1946-49, and was vice-president, 1950-52. He became an honorary member of the Society in 1953.
O'Connell retired as director of the Vatican Observatory in 1970. He was president of the Pontifical Academy of Science, 1968-72. While he was an indefatigable worker and consequently very jealous of his time, he still treasured his friends immensely, and was always nurturing new friendships. Even during his last years, when he was largely bedridden, he developed new friendships among old and young alike. The students at Riverview remembered him for showing groups of boys the Moon, planets and the stars on clear nights and for his unfailing gracious word and cheery smile for staff and students.
Many were the nights that, under the then clear skies over Castel Gandolfo. O'Connell climbed the stairs to the telescope atop the papal palace passing die plaque inscribed “Deum Creatorurn Venite Adoremus. He was very intelligent, hardworking and always a gentleman genuine international Jesuit.

Note from Noel Burke-Gaffney entry
1950 He was appointed Director of the Observatory at Riverview after Daniel O’Connell was appointed to the Vatican Observatory

Note from William O’Leary Entry
He remained at Riverview until his death in 1939, directing the observatory until 1937 when Daniel O'Connell became director

Note from Edward Pigot Entry
His extremely high standards of scientific accuracy and integrity made it difficult for him to find an assistant he could work with, or who could work with him. George Downey, Robert McCarthy, and Wilfred Ryan, all failed to satisfy. However, when he met the young scholastic Daniel O'Connell he found a man after his own heart. When he found death approaching he was afraid, not of death, but because O’Connell was still only a theologian and not ready to take over the observatory. Happily, the Irish province was willing to release his other great friend, William O'Leary to fill the gap.

◆ Irish Province News
Irish Province News 23rd Year No 4 1948
Fr. Daniel O'Connell of the Vice-province visited Ireland after an absence of many years, early in September: He has had a very busy time since he left Australia : he did some astronomical work at Leyden before going to the Vatican Observatory where he spent 6 weeks ; he attended a Meeting at Zurich of the International Astronomical Union and then went on to Oslo for the Congress of the International Union of Geodesy and Geophysics. He has been invited to lecture to the Irish Astronomical Society at Armagh and to be the guest of Dr. Lindsay, Director of the Armagh Observatory, who is a good friend of his since the Harvard days when they spent two years together at that Observatory. Fr. O'Connell is due to sail for the United States from Southampton on 6th November and will spend some months at Harvard Observatory before returning to Australia.

Irish Province News 24th Year No 1 1949
On 6th November Fr. Daniel O'Connell, of the Vice-province, who during his stay in Ireland gave evidence in Fr. Sullivan's cause, left Southampton for U.S.A. on 6th November.
Irish Province News 58th Year No 1 1983
Obituary
Fr Daniel O'Connell (1896-1913-1982) (Australia)

I met Dan O'Connell for the first time when I went to the noviciate, then in Tullabeg. I found him a quiet novice but a very pleasant companion. We both went to Rathfarnham and were together in our First Arts year (1916-17). He was a brilliant and highly intelligent man. He took a keen interest in Fr William O’Leary's seismograph, which stood in Rathfarnham grounds, and frequently inspected it with him.
We parted company in 1920, when he went to Valkenburg for philosophy while I followed the subject in Milltown. Two years later we were both posted to Australia. We did not travel there together but met in Riverview College, Sydney, where we spent our regency. In Riverview was the Irish Jesuit, Fr Edward Pigot, who had an astronomical observatory, in which Dan became keenly interested, Fr Pigot himself had erected this observatory and fitted it out with a strong telescope for watching the various stars at night. He was also an accomplished pianist and taught Dan the piano.
In 1926 Dan followed me to Milltown for theology. Together we were ordained there by the Archbishop of Dublin, Dr Edward J. Byrne. Later, whenever Fr Dan came back to Dublin, he stayed with Dr Byrne's successor, Dr John Charles McQuaid, who was a great friend of his, as they had been classmates in Clongowes. Twenty or so years after Fr Dan's return to Riverview, he was called to Rome to take charge of the Vatican observatory, and ended his days in Rome.

The summary notice, taken from L'Osservatore Romano (16th October 1982) and transmitted by Frs Joseph Costelloe and John P. Leonard of the General Curia, fills in some of the external details of Fr O’Connell’s life:
"Yesterday evening, Thursday, 14th October, Fr Daniel O’Connell, former Director of the Vatican Observatory and ex-President Emeritus of the Pontifical Academy of Sciences, died after a long illness in the infirmary of the Jesuit General Curia in Rome.
Born in Rugby, Great Britain, in 1896, he had entered the Society of Jesus in Ireland in 1913. After completing his studies in physics and mathematics at the University College, Dublin, he spent two years of special studies at the Harvard College Observatory in Cam bridge, Massachusetts, between 1931 and 1933.
He then became Director of the Riverview College Observatory in Australia, where he remained until 1952, when he was appointed Director of the Vatican Observatory, which he directed until 1970. From 1968 until 1972, he was, by the appointment of Paul VI, President of the Pontifical Academy of Sciences.
Known for his scientific labours, especially for his researches on double stars - an area in which he discovered a particular effect named after him - Fr O'Connell was a member of many international societies, including The National Research Council of Australia, The Royal Academy of Ireland, and The Royal Society of New South Wales”

Frs George V Coyne and Martin F McCarthy SJ, of the Vatican Observatory brought out a glossy four-page printed leaflet (of A4-size page) as a memorial to their fellow-astronomer and fellow-Jesuit. Five of the photographs therein show Fr O’Connell greeting in turn four recent Popes, including the present one. An interesting account is also given of his astronomical work. The editor of IPN has at his disposal at least one photocopy of this leaflet, which he will gladly send to any contemporary of Fr Dan’s or to any other interested person who might like to have it.
Fr Dan O’Connell contributed two articles to the New Catholic Encyclopedia: “Calendar reform” and “Vatican Observatory”. He featured in past numbers of The Clongownian: 1953, pp. 9-12, “Astronomer and seismologist”; 1968, pp. 42-3; 1974, p. 33 (copy of an autographed letter to him from Paul VI).

◆ Interfuse
Interfuse No 86 : July 1996

Obituary
Fr Daniel O’Connell (1896-1982)
Like William Keane, Daniel O'Connell was a brilliant student who devoted his life to the Lord's work in the Society. He was born at Rugby, England, on 25th July to an Irish father and English mother, At the age of 12 when his parents died, he went to Ireland and completed his secondary education at Clongowes College; in view of his examination results, I presume that he was Dux of his class, as William Keane had been. One of his masters was Henry Johnston, and one of his fellow students was John Charles McQuaid, later a famous Archbishop of Dublin. At the age of 17, he entered the novitiate of the Irish Province at Tullabeg on August 8th, 1913. A fellow novice described him as 'quiet but a very pleasant companion', qualities noted in him throughout his later life which were to win him many friends.

It may be remarked, incidentally, that although he was related to the Liberator' he was called Daniel after another member of the family.
University Studies
University studies were at the National University of Ireland where he did a brilliant scientific course with first class honours in experimental physics and mathematics, ending with a Master of Science. With other scholastics he would have commuted to the University from Rathfarnham Castle, Juniorate residence and later retreat house. In its grounds was a seismograph, erected by Fr. William O'Leary, who was later to take over from Fr. Pigot as Director of the Riverview Observatory. Daniel took a keen interest in this, a fact which was not lost on Fr. O'Leary who was later to choose him as their designate'. For Philosophy, Daniel was sent to Valkenburg in Holland where the German Provinces had their house of studies, having been driven out of Germany by Bismarck's Kulturkampf. Here he pursued part-time studies in astronomy under important German Jesuit scientists. Arrangements had been made for him to enter Cambridge University to study relativity under Sir Arthur Eddington but he experienced a breakdown in health, had lung trouble, and was sent to Australia to recuperate and do Regency. He taught at the observatory in 1923 under Fr. Pigot. The latter was also a fine pianist and taught Daniel the piano.

In 1926 Daniel returned to Ireland for theology, studied at Milltown Park and was ordained on July 31st, 1928 by the then Archbishop of Dublin. Tertianship was at St. Beuno's, Wales(1930-1931).

Further Studies
Destined now to become a professional astronomer, Daniel returned to Australia and the Observatory but the following year went to Harvard for further studies and research at its Observatory, then a great centre of research under Howard Sharpley and others. His principal occupation there was the study of variable stars which he continued throughout life and through which he made his name as an astronomer. In 1948 he was awarded a doctorate in science from the National University of Ireland for outstanding services to astronomy, but he also became interested in seismology and the measurement of time with various types of clocks. (These and other scientific details are taken from a brief memorial bulletin published by the Vatican Observatory after Daniel's death in 1982.)

Riverview Observatory (1933-1952)
After visiting other observatories, he returned to Riverview as Assistant Director of the Observatory, taking over from Fr. O'Leary in 1938 when the latter died on the Riverview golf course. (Fr. O'Leary is remembered at Riverview as the inventor of a Free Pendulum clock of superb accuracy which used to stand in the corridor outside the Rector's room in the old building.)

The Observatory received a small grant (£450 in 1939) from the Australian government. When Daniel took over and for a number of years afterwards it had the only fully equipped seismological station in Australia and its reports appeared in the local papers whenever a major earthquake occurred. Its astronomical work consisted mainly in the photographing of variable stars, a work which Daniel carried out himself in the hours of darkness when others were asleep. The increasing illumination of the skies above Sydney rendered this more and more difficult but he managed to make 20,000 plates over the years.

During his years at the Observatory Daniel became a highly respected figure in astronomical circles in Australia and elsewhere, becoming, for instance, a Fellow of the Royal astronomical Society among other memberships. But he was no remote scholar. He had a gift for popularizing science when this was needed and he was called on occasionally by the ABC for broadcasts. When Fred Hoyle (of Steady State fame) delivered a number of lectures on the BBC on “The Nature of the Universe” Daniel was asked to give three lectures on the ABC on the same topic. He called his lectures “According to Hoyle” and made it very clear that his distinguished counterpart was wrong in dismissing the Creator from the origin of things. Hoyle, who must be a very old man now, is said to be now more in favour of creation, impressed by the 'fine tuning' of the universe.

Riverview
While Daniel did not teach, he was an object lesson to the boys that science and religion could be reconciled. He was also a familiar and friendly priest, whose sermons they listened to in the chapel with more than usual attention. He could get down to their level. There were occasional guided tours of the Observatory - I had some myself when I was at Riverview as a scholastic 1947-1949. He was also a 'good community man'. The only thing that annoyed him was noise, and most particularly the lowing of Brother O'Brien's cows which disturbed his sleep by day after a night of observation. But he did not have recourse to the 'ultimate deterrent' of shooting one or two. He bore it cheerfully enough as he did the loneliness of much of his work. I think of him as a very dedicated, kindly person.

Vatican Observatory
In 1952 news came that Daniel had been appointed Director of the Vatican Observatory located at the papal summer residence at Castelgandolfo in the hills 16 miles from Rome. His appointment was a 'most strict secret', which he observed most faithfully, but it was leaked out over in Rome so he was embarrassed by people asking him if it were true. Due to illness and the necessity of taking up the appointment quickly, he had little time to say goodbye to his many friends in Australia. He left by ship on July 26th, 1952, bringing to an end almost a quarter of a century at Riverview and its Observatory, both of which remained very dear to him.

From 1952 until his retirement in 1970 he was Director at the Vatican Observatory. He was President of the Pontifical Academy of Science from 1968 to 1972. He served three Popes and had close personal relations with them. Over the years he published a number of books (e.g. The Green Flash, Stellar Populations, Nuclear Galaxies) and many papers. The Vatican Observatory gave him much greater scope than he would have had at Riverview. He could do better work and was in contact with a wider group of scientists. There were times when he lamented that he had never given a retreat, but his was a full-time ministry.

Retirement (1970 - 1982)
His health, never very robust, gave him increasing problems so he had ultimately to retire from the Observatory and come to live in Rome at our Curia. The Pope wanted him to stay in Rome and keep in touch with the Pontifical Academy. In August 1973 he was allowed to make a trip to Australia to attend a conference and make contact. Of course, he had always kept in touch and delighted to meet Australian Jesuits studying in Rome. I have very happy memories of meeting with him during the 32nd General Congregation. He had a great memory for the Australian brethren and even for the boys he had known at Riverview.

His health became worse and worse so that for the last two years he was practically bed-ridden. He died in the infirmary at the Curia on October 13th, 1982. The notice in the Osservatore Romano mentioned that he had bore his long illness with marvellous serenity and was comforted by the special blessing of the Holy Father, John Paul II. One can only say that the papal blessing was richly deserved - Daniel O'Connell had been a very faithful servant of the Church in the difficult field of science.
With similar talents and in different ways, William Keane and Daniel O'Connell made very significant contributions to the work of the Province and the Society. As they were men who shared their wisdom with others we may trust that they will shine like stars for all eternity (Book of Daniel, 12:3)
John Begley
Australian Province Taken from “Jesuit Life” Newsletter

◆ The Clongownian, 1953
Astronomer and Seismologist
Father Daniel O’Connell SJ
THE appointment of Father Daniel O'Connell SJ, director of Riverview Observatory, New South Wales, Australia, since 1938, as Director of the Vatican Observatory in Rome, climaxes a long and eminent career as astronomer and seismologist.
Father O'Connell enjoys world repute as a scientist and he has contributed much to the high reputation enjoyed by the famous Jesuit observatory at Riverview.
He holds the Doctorate of Science of the National University of Ireland and the Docotrate of Philosophy of the Gregorian University of Rome, and is a Fellow of the Royal Astronomical Society.
He was born near Rugby, England, in 1896, of an Irish father, a civil servant and a native of County Limerick, and an English mother. He had two brothers and one sister, all of whom are still living. He went to Ireland as a boy of 12, following the death of his parents, completed his schooling at Clongowes Wood College, and entered the Society of Jesus at Tullabeg at the age of 17.
His family has a 600-years-old affinity with that of “The Liberator”. He was not, however, called after “The Liberator”. The Christian name, Daniel, was traditional in his family.

His first introduction to astronomy was a year's private study with the late Father W O'Leary SJ, a famous Irish Jesuit astronomer and seismologist, who at that stage was Director of the Rathfarnham Observatory from 1929 to 1938. He began by setting up some telescopes at Rathfarnham, largely as a hobby.

Father O'Connell completed his MSc degree at University College, Dublin, in 1920, after a brilliant course of study, specialising in Mathematics and Experimental Plıysics. He topped all his examinations, graduated with first-class honoura, and was awarded a travelling student ship in Mathematics. Whilst he was still an undergraduate he was in charge of the Rathfarnham station for several years after the departure of Father O'Leary.

He completed his philosophical studies at the Jesuit House at Valkenburg, in Holland, where he also pursued spare time astronomical studies under world famous Jesuit scientists like Father Michael Esch SJ, expert on variable stars; Father Franz Xavier Kugler SJ, world authority on Assyriology and Babylonian astronomy, and Father Theodor Wulfe SJ, world-ranking physicist.

Arrangements had been made for him to enter Cambridge University on a travelling scholarship where he would have studied relativity under Eddington, when he experienced a breakdown in health and was sent to Australia by his superiors to recuperate. Prior to this, he had never dreamt of going to Australia, had thought little about that country, and had few friends there.

An interesting and significant incident occurred whilst he was studying at Valkenburg. Seemingly for no apparent reason, Father Edward Pigot SJ, Founder of Riverview Observatory, appeared at the college one day during a visit to Europe. The young Jesuit student met the veteran and conversed with him. He was later invited to accompany him to the railway station to see him off. Just before he boarded his train, Father Pigot mentioned that his real reason for coming was to see the future Director of Riverview and to “look him over”. It was no surprise when he later sought him as his assistant.

Father O'Connell was appointed to St Ignatius College, Riverview as teacher of physics and assistant to the Director of the Observatory, Father Pigot. Father O'Connell is still happy to recall that another assignment in the early days was that of sports master at St Ignatius. In 1923 he was appointed assistant director of the observatory, and one of the first tasks he undertook in his new post was to advance the local study of solar radiation.

Father O'Connell returned to Dublin in 1926 to complete his theological studies and was ordained at Milltown Park by Archbishop Byrne in 1928. After two more years of theological studies he com pleted his tertianship in St Beuno's College, Wales.

During 1931 to 1933, Father O'Connell was a member of the staff of the Harvard University Observatory, renowned for its work on variable stars, where he completed post-graduate studies and research on variable stars and other aspects of astronomy. He published numerous papers in Harvard publications, and has since acknowledged that his work at Harvard was the foundation of his later contribution to astronomy.

During his stay in the United States Father O'Connell visited Mount Wilson and Lick Observatories in California before returning to Australia via Japan, China, Java and the Philippines, where he visited leading observatories and advanced his practical studies. The Lembang Observatory in Java was one that held special interest for him.

Father O'Connell resumed his work at Riverview Observatory at the end of 1933. In 1935 he initiated the “Riverview Observatory Publications”, which now enjoy an international reputation. Later he also founded the observatory's “Geophysical Papers” and “Reprint Series”, which are also known and used internationally. In 1948 Father O'Connell spent 10 months in Europe. He was the Australian delegate at the conference of the International Astronomical Union at Zurich and that of the International Union of Geodesy and Geophysics at Oslo. He spent six weeks at the Vatican Observatory and visited other leading observatories of Europe.

During World War II, Father O'Conneil, working at the Riverview Observatory collaborated with the United States Government in the location of earthquakes in the Pacific zone in relation to war strategy. This work was carried on in the post-war period and is still taking place. Each week a cabled report in code is sent to the United States from Riverview. He was also consulted by the Imperial War Graves Commission concerning possible earthquake damage to war cemetery sites in the Pacific area.

In 1948 Father O'Connell received his Doctorate of Science from the National University of Ireland in recognition of his outstanding contributions to science.

Father O'Connell is a member of leading Australian and overseas societies and other organisations, and has contributed numerous research papers and other writings to their publications and proceedings.

He is a member of the Royal Irish Academy and the international Astronomical Union, Fellow of the Royal Astromomical Society, Vice-President of the Royal Society of New South Wales, member of the National Research Council of Australia and the National Committee on Astronomy, Geophysics and Calendar reform; Chairman of the Board of Visitors of the Commonwealth Observatory, Mount Stromio; Australian representative on the Committee for Seismology of the Pacific Science Commission and member of many other scientific councils and committees in Australia. Father O'Connell resigned from 19.Boards and Committees..

Under Father O'Connell's direction, the Riverview Observatory has conducted a programme of continuous research that has been responsible for important discoveries. In the field of astronomy, eclipsing stars and cepheid variables have received special study. The photographic photometry of these stars has been one of the main aspects of the observatory's programme. Hundreds of new variable stars have been discovered, and much original research has been completed on known stars. About 15,000 plates are on file in the observatory.

Variable stars are those which are con stantly changing in brightness. Another star may move in front of them, they may expand or contract becoming hotter and brighter.

Knowledge of variable stars is highly important and basic to progress in modern astronomy. But for a knowledge of cepheid stars, for example, scientists would not have the faintest notion of the size of the universe,

One of Father O'Connell's latest activities was the use of photo-electric equipment in relation to variable stars.

Father O'Connell is reassured by the knowledge that this and other phases of the work at Riverview will continue and, naturally, it is his hope that necessary staff and equipment will be forthcoming. The fact that the direction will be in the hands of Father Burke-Gaffney gives Father O'Connell confidence in the future work and role of the observatory. Father O'Connell has taken some material on southern stars with him to Rome for completion.

In the field of seismology, the observatory's programme has included the regional study of earthquakes and the relation ship between earthquake waves and the interior of the earth.

The publications of Riverview Observatory are an important aspect of the work. They include four series - the “Seismological Bulletins”, which have appeared since 1909, the “Riverview Observatory Publications”, which began in 1935, the “Reprint” series, which date back to 1936, and the “Geophysical Papers”, which were founded in 1946. All of them are circulated and read all over the world.

The Riverview Observatory, which progressed under Father O'Connell, has never been anything but first-rate. It inherited this tradition from its founder and it was maintained by later directors. Complete accuracy has always been its aim, and all of its work has proved to be as careful and painstaking as human processes can ensure. Its equipment has always been the best available and its overhead has growii in dimension as well.

Father O'Connell left Sydney by slip for Rome on July 26 to take up his net post.

It distressed him that he was unable to make a personal farewell to many of his friends before he left Australia, due to the fact that he was confined to bed until the day before his ship sailed.
The Catholic Weekly (Sydney)

◆ The Clongownian, 1983
Obituary
Father Daniel Joseph Kelly O’Connell SJ
On October 14, 1982, the Jesuit order lost one of the best known of its modern scientists, the internationally acclaimed astronomer: Father Daniel J K O'Connell SJ. After several years of serious and confining sickness, Father O'Connell died peacefully among his Jesuit brothers at the order's headquarters in Rome, where he had settled after his retirement in 1970. In addition to directing the Vatican Observatory from 1952 to 1970, he was President of the Pontifical Academy of Sciences from 1968 to 1972 and President of the Commission on Double Stars of the International Astronomical Union from 1955 to 1961. He served three popes and had close personal relationships with all of them.

Born in Rugby, England, in 1896, he entered the Jesuit order in Ireland in 1913. He received his diploma in experimental physics and a Master of Science degree in mathematics at University College Dublin, and later a Doctorate in Science from the National University of Ireland. He studied from 1931 to 1933 at the Harvard College Observatory, Cambridge, Massachusetts, and was subsequently to have studied with the famous Sir Arthur Eddington. However, because of a lung condition, Jesuit superiors, in order to provide him with a more favourable climate, assigned him to the Riverview College Observatory, Sydney, Australia, where he became director in 1938.

During the years that Father O'Connell was at Harvard, the observatory was at the centre of the major developments in astronomical research and especially those which were to lead within the next few decades to the notion of the expanding universe of galaxies. He was thus associated with such eminent astronomers as Harlow Shapley, Cecilia Payne Gaposhkin, and others. His principal occupation at Harvard, a pursuit which he continued for the rest of his life, was the study of variable stars; but he also became known as a keen card player, especially at bridge. In fact, a story is told of how two young graduate students were duped into an evening of bridge against Father O'Connell and the famous cosmologist Abbé Georges Lemaitre on the occasion of a visit which the latter paid to the Harvard College Observatory. The students, not knowing the true identity of their challengers except that they gave a distinct impression of being neophytes at bridge, since they were overheard explaining to one another in broken English and French the names of the cards, were a bit embarrassed to accept the challenge for fear of crushing opponents to whom they were expected to show at least respectful deference. After a long evening of play the students, soundly defeated and thoroughly deflated, approached the famous Harlow Shapley for an explanation. His only remark to them was that the game must have been both an honest and an intelligent one, at least on the part of the two older gentlemen, since both of them were on the one hand Catholic priests and on the other eminent scientists.

While at the Riverview College Observatory, in addition to his study of variable stars, Father O'Connell, under the tutelage of the famous Father Wm O'Leary SJ, developed a keen interest in seismology and in the measurement of time with various types of clocks. This latter pursuit led him into a life long interest in the calendar and calendar reform, a study which served him well in later decades, since he was asked to advise popes on calendar reform and the cycle of ecclesiastical feasts.

Called to be director of the Vatican Observatory in 1952, Father O'Connell began a career of unique service to the Church which spanned the reign of three popes and saw immense developments in astronomical research from the initial concept of various stellar populations to an expanding universe containing active galactic nuclei and quasars, In fact, during his directorship, once near the beginning and once at the end, Father O'Connell organized Study Weeks of the Pontifical Academy of Sciences at which some of the world's most capable astronomers discussed the topics respectively of Stellar Populations (1957) and Nuclei of Galaxies (1970). As a result of these Study Weeks two books were published, both edited by Father O'Connell, which have become classics of astronomical literature.

Of his many contacts with the popes he served, his relationship with Pope Pius XII was an especially close one. He frequently advised the pope, himself a very keen and diligent student of the natural sciences, on topics of current scientific research. The International Astronomical Society held its triennial meeting in Rome in 1952, the same year that Father O'Connell came as director to the Vatican Observatory. At an audience and reception given by the Pope, the first opportunity was given to the pontiff to appreciate what a qualified representative the Church had in Father O'Connell as an interpreter of the Church's aspirations to the culture of science. It was under Pius XII that the major modern research tool of the Vatican Observatory, the Schmidt telescope, planned under his predecessors but completed under Father O'Connell, was inaugurated and blessed. Pope Pius XII often visited the observatory and, in fact, as a gesture of his interest, came to view through the Schmidt telescope with Father O'Connell on the night when the Space Age was born with the launching of the Russian Sputnik.

Pope John XXIII showed a special affection for Father O'Connell and the observatory staff and not infrequently paid visits to Father O'Connell's office, which was located directly above the Pope's private study. At the time of the landing of the first man on the moon, Father O'Connell had the privilege of viewing the event with Pope Paul VI over a specially installed television and he advised the Pope on the technical details of the mission.

In the pursuit of his scientific research, Father O'Connell was a close friend and collaborator of an international community of astronomers. As director of the Riverview College Observatory, he came to Europe in 1948 to attend the first postwar meeting of the International Astronomical Union held at Zurich, and on that occasion he visited many European observatories. His visit to Utrecht was noteworthy, for there he established a life long friendship with Professor Minnaert who later encouraged him to issue the now famous book on the Green Flash, which, published in collaboration with Brother Karl Treusch SJ, provides excellent documentation on optical effects which occur in the earth's atmosphere when the sun is rising or setting. However, Father O'Connell was best known in the inter national community of astronomers for his research on double stars. He discovered an effect - since known as the “O'Connell Effect”, concerning the rotation of the line of the apsides (the major axis of the double star's elliptical orbit). The discovery of this effect was typical of the scientific work of Father O'Connell. It required a long period of pains taking observations and careful analyses over many years.

In addition to his membership in the academies and institutes mentioned above, Father O'Connell was a member of the National Research Council of Australia, and an honorary member of both the Royal Society of New South Wales and of the Royal Irish Academy

While he was an indefatigable worker and consequently very jealous of his time, he still treasured immensely his friends and was, as a matter of fact, always nurturing new friend ships. Even during his last years, when he was largely bedridden, he developed new friend ships among old and young alike. There was never an international scientific conference attended by Vatican astronomers in the Rome area where the participants failed to request to pay a visit to Father O'Connell. Many were the nights that, under the then clear skies over Castle Gandolfo, Father O'Connell climbed the stairs to the telescope atop the papal palace passing the plaque inscribed thus: Deum Creatorem Venite Adoremus. In serving many, of high and low station alike, he was serving but One, the Creator of all that he observed. For that Daniel Joseph Kelly O'Connell, sj. has been called to his Father and we are happy for him.

George V Coyne SJ (Maryland) and Martin F McCarthy SJ (New England), Vatican Observatory.