Groombridge 1830
NASA
Groombridge 1830 is an older and dimmer,
yellow-orange star than our Sun, Sol. (See a
Digitized Sky Survey image of Groombridge
1830 from the Nearby Stars Database.) ...
Groombridge 1830 is a star in the constellation Ursa Major.
It is a yellow-orange class G8 subdwarf catalogued by Stephen Groombridge in the 1830s. Its high proper motion was noted by Friedrich Wilhelm Argelander in 1842.
Groombridge 1830
A famous halo star that lies 28 light-years away in the constellation Ursa Major. Its proper motion, discovered in 1841, was then the largest known, displacing that of 61 Cygni.
Grotrian Diagram ...
Groombridge 1830 and Lalande 21185, both of which require a finder's chart, and 47 Ursae Majoris, which has recently been found to have a planet which could theoretically support water.
per second, but of these the only one reliably determined is Groombridge 1830, whose speed is found to be about 150 m. per second. Probably the velocity of Arcturus is also over 100 m.
Only a few years later, however, Groombridge 1830 was discovered to have a larger proper motion. 61 Cygni retains the distinction of having the largest proper motion of any star visible with the unaided eye (although Groombridge 1830 at magnitude 6.
produced by the grating is deflected by the prism to remain on the optical axis and the apex angle of the prism is chosen to get a certain wavelength in the center of the detector. Grisms can be placed in a filter wheel. [McL97]
Groombridge 1830 ...
 See also: Star, Sun, Light, Dwarf, Distance
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