Kapteyn's Star

Kapteyn's Star (also known as GJ 191, HD 33793 or CD -45 1841) is a class M0 subdwarf discovered by Jacobus Kapteyn in 1897. It is 12.79 light years from Earth's Solar System, and is distinctive in a number of regards; it has a high radial velocity, orbits the Milky Way retrograde, and is the nearest halo star to the Sun. It is also known as HD33793, CD-45°1841, GCTP 1181.00, LHS 29 and UGPMF 628.

When discovered, it had the highest proper motion of any star known, dethroning Groombridge 1830. Later it dropped to second place after the discovery of Barnard's Star.

Contents

1 Some facts about Kapteyn's Star 2 See also 3 External links 3.1 Discovery announced

Some facts about Kapteyn's Star

• Parallax: 0.255 arcsecs
• Spectral type: M0 V
• Radial velocity: +246.3 km/s
• Proper Motion: 8.671 arcsecs/year
• Apparent Visual Magnitude: 8.86
• Absolute Visual Magnitude: 10.9
• Luminosity: 0.013 Solar Luminosities

See also

• List of nearest stars

External links

• SolStation.com: Kapteyn's Star

Discovery announced

• "Stern mit grösster bislang bekannter Eigenbewegung", AN 145 (1898) 159/160 (in German)