- Thomas James Henderson
Thomas James Henderson (
28 December 1798– 23 November 1844) was a Scottish astronomer noted for being the first person to measure the distance to Alpha Centauri, the major component of the nearest stellar system to Earth, and for being the first Astronomer Royal for Scotland.
Dundee, Scotland, he was educated at the High School of Dundee, after which he trained as a lawyer, working his way up through the profession as an assistant to a variety of nobles. However, his major hobbies were astronomy and mathematics, and after coming up with a new method for using lunar occultationto measure longitudehe came to the attention of Thomas Young, superintendent of the Royal Navy's "Nautical Almanac". Young helped Henderson enter the larger world of astronomical science, and on his death a posthumous letter recommended to the Admiralty that Henderson take his place.
Henderson was passed over for that position, but the recommendation was enough to get him a position as the British observatory at the
Cape of Good Hopein South Africa. There he made a considerable number of stellar observations between April 1832 and May 1833, including those for which he is remembered today. It was pointed out to him that the bright southern star Alpha Centauri had a large proper motion, and Henderson concluded that it might be a close star.
The 1830s version of the "space race" was to be the first person to measure the distance to a star using
parallax, a task which is easier the closer the star. Henderson was thus in a good position to be this person. After retiring back to the United Kingdom due to bad health, he began analysing his measurements and eventually came to the conclusion that Alpha Centauri was just slightly less that one parsecaway, 3.25 light years. This figure is reasonably accurate, being 33.7% too small.
Doubts about the accuracy of his instruments kept him from publishing, however (there had been previous, discredited attempts to claim a measurement of stellar parallax), and eventually he was beaten to the punch by
Friedrich Wilhelm Bessel, who published a parallax of 10.4 light years (9.6% too small) for 61 Cygniin 1838. Henderson published his results in 1839, but was relegated to second place because of his lack of confidence.
In the meantime, his measurement work at the Cape had led him to be appointed the first
Astronomer Royal for Scotlandin 1834. The vacant chair of astronomy at the University of Edinburghwas given to him on the advice of Prime Minister Lord Melbourne.
From 1834 he worked at the
City Observatory, Edinburghuntil his death. He is buried in Greyfriars Kirkyard. He also claimed a right to different types of astronomy.
# [http://www.astronomyedinburgh.org/publications/journals/38/hend.html Astronomical Society of Edinburgh - journal 38]
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Thomas James Henderson — (* 28. Dezember 1798 in Dundee, Schottland; † 23. November 1844) war ein schottischer Astronom. Er war dafür bekannt, dass er als Erster die Distanz von Alpha Centauri zur Erde berechnete und dafür, dass er der erste Astronomer Royal for Scotland … Deutsch Wikipedia
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