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Encyclopedia > Groombridge 1830
Groombridge 1830
Star listing of all stars

Groombridge 1830 is a star.


Also known as GJ 451, HD 103095, BD+38 2285, SAO 62738, it is a class G8 subdwarf catalogued by Stephen Groombridge in the 1830s. Its high proper motion was noted by Friedrich Wilhelm Argelander in 1842.


It is 29.7 light years from Earth's Solar System, which means its absolute magnitude is almost equal to its apparent magnitude. It is a halo star; such stars account for only 0.1 to 0.2 percent of the stars near the Sun. It is in Ursa Major.


It is a binary star with a period of 175 days.


When discovered, it had the highest proper motion of any star known, replacing 61 Cygni in that department. Later it dropped to second place after the discovery of Kapteyn's Star, and still later to third place after the discovery of Barnard's Star. It is considerably farther away than either of those stars, however, which means its transverse velocity is greater.


Actually, it is the Sun which is following the motion of galaxy rotation by revolving around the center of the Milky Way; halo stars like Groombridge 1830 do not follow this galaxy rotation and thus are "standing still" and appear to be moving in "retrograde direction" at high speed.

Contents

Some facts about Groombridge 1830

See also

External links

  • SolStation.com: Groombridge 1830 (http://www.solstation.com/stars/groo1830.htm)

Discovery of high proper motion

  • AN 19 (1842) 393/394 (http://adsabs.harvard.edu//full/seri/AN.../0019//0000202.000.html) (in German)
  • AN 20 (1843) 163/164 (http://adsabs.harvard.edu//full/seri/AN.../0020//0000091.000.html) (in German)
  • AN 20 (1843) 279/280 (http://adsabs.harvard.edu//full/seri/AN.../0020//0000155.000.html)

  Results from FactBites:
 
Stephen Groombridge - Wikipedia, the free encyclopedia (201 words)
Stephen Groombridge (January 7, 1755 – March 30, 1832) was a British astronomer.
In 1806, using a transit circle, he began compiling a star catalogue of stars down to about 8th or 9th magnitude.
A few years later in 1842, one of the stars in his catalogue, Groombridge 1830, was discovered by Friedrich Wilhelm Argelander to have a very high proper motion.
  More results at FactBites »

 
 

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