James Craig Watson

For other people named James Watson, see James Watson (disambiguation).

"J. C. Watson" redirects here. For the Australian Prime Minister John Christian Watson, see Chris Watson.

James Craig Watson
File:James Craig Watson (1838-1880).jpg Portrait of James Craig Watson James Craig Watson (1838–1880)
Born	(1838-01-28)January 28, 1838 Fingal, Ontario
Died	Madison, Wisconsin
Cause of death	peritonitis
Nationality	Canadian
Education	University of Michigan
Occupation	Professor, physicist, astronomer
Known for	Discovery of comets and asteroids
Awards	Lalande Prize

Asteroids discovered: 22

79 Eurynome	September 14, 1863
93 Minerva	August 24, 1867
94 Aurora	September 6, 1867
100 Hekate	July 11, 1868
101 Helena	August 15, 1868
103 Hera	September 7, 1868
104 Klymene	September 13, 1868
105 Artemis	September 16, 1868
106 Dione	October 10, 1868
115 Thyra	August 6, 1871
119 Althaea	April 3, 1872
121 Hermione	May 12, 1872
128 Nemesis	November 25, 1872
132 Aethra	June 13, 1873
133 Cyrene	August 16, 1873
139 Juewa	October 10, 1874
150 Nuwa	October 18, 1875
161 Athor	April 19, 1876
168 Sibylla	September 28, 1876
174 Phaedra	September 2, 1877
175 Andromache	October 1, 1877
179 Klytaemnestra	November 11, 1877

James Craig Watson (January 28, 1838 – November 22, 1880) was a Canadian-American astronomer born in the village of Fingal, Ontario Canada. His family relocated to Ann Arbor, Michigan in 1850.

At age 15 he was matriculated at the University of Michigan, where he studied the classical languages. He graduated with a BA in 1857 and received a master's degree on examination after two years' study in astronomy under professor Franz Brünnow. He became Professor of Physics and instructor in Mathematics, and in 1863, succeeded him as professor of Astronomy and director of the Detroit Observatory. He wrote the textbook Theoretical Astronomy in 1868.

He discovered 22 asteroids, beginning with 79 Eurynome in 1863. One of his asteroid discoveries, 139 Juewa was made in Beijing when Watson was there to observe the 1874 transit of Venus. The name Juewa was chosen by Chinese officials (瑞華, or in modern pinyin, ruìhuá). Another was 121 Hermione in 1872, from Ann Arbor, Michigan, and this asteroid was found to have a small asteroid moon in 2002.

He was a member of the most important expeditions for astronomical observation sent out by the United States Government during his time. The first was an expedition to observe the eclipse of the sun at Mount Pleasant, Iowa, in 1869; the second of a similar expedition to Sicily, in 1870; the third to Beijing, China, to observe the transit of Venus in 1874; the fourth to Wyoming, to observe the total eclipse of the sun in 1878. He was a strong believer in the existence of the planet Vulcan, a hypothetical planet closer to the Sun than Mercury, which is now known not to exist (however the existence of small Vulcanoid planetoids remains a possibility). He believed he had seen such two such planets during his observation of the 1878 solar eclipse.

In 1879 he resigned his professorship at Ann Arbor to accept a call to the University of Wisconsin, where he hoped to find superior apparatus and instruments for the difficult observations which he had planned. He died of peritonitis at the age of only 42 and was buried at Forest Hill, Ann Arbor. He had amassed a considerable amount of money through non-astronomical business activities. By bequest he established the James Craig Watson Medal, awarded every two years by the National Academy of Sciences for contributions to astronomy.

Watson won the Lalande Prize given by the French Academy of Sciences for 1869. He was a member of the National Academy of Sciences and the American Philosophical Society. He received the honorary degree of Doctor of Philosophy from the University of Leipzig in 1870, and from Yale College in 1871, and the degree of Doctor of Laws from Columbia in 1877. The asteroid 729 Watsonia is named in his honour, as is the lunar crater Watson.