HR 7722

HR 7722, or Gliese 785 is a star in the constellation Capricornus. It is located in the solar neighborhood at a distance of just under 29 light years, and is just within the range of luminosity needed to be viewed from the Earth with the unaided eye. HR 7722 is suspected of being a variable star, but this is unconfirmed.

HR 7722 has about 78% of the Sun's mass.[2] The proportion of elements other than hydrogen and helium, known as the metallicity, is similar to that of the Sun.[3]

The space velocity components of this star are (U, V, W) = (–69, –13, –14) km/s. It is following an orbit through the Milky Way galaxy that has an orbital eccentricity of 0.18 at a mean galactocentric distance of 8.1 kpc.[4]

Planetary system

The system has a planet "b", discovered in 2010.[5]

References

1. ^ a b Mamajek, Eric E.; Hillenbrand, Lynne A. (November 2008). "Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics". The Astrophysical Journal 687 (2): 1264–1293. doi:10.1086/591785. Bibcode: 2008ApJ...687.1264M.
2. ^ a b Santos, N. C.; Israelian, G.; Mayor, M. (July 2001). "The metal-rich nature of stars with planets". Astronomy and Astrophysics 373: 1019–1031. doi:10.1051/0004-6361:20010648. Bibcode: 2001A&A...373.1019S.
3. ^ a b c d Ecuvillon, A.; Israelian, G.; Santos, N. C.; Mayor, M.; García López, R. J.; Randich, S. (May 2004). "Nitrogen abundances in planet-harbouring stars". Astronomy and Astrophysics 418: 703–715. doi:10.1051/0004-6361:20035717. Bibcode: 2004A&A...418..703E.
4. ^ Porto de Mello, Gustavo; del Peloso, Eduardo F.; (April 2006). "Astrobiologically Interesting Stars Within 10 Parsecs of the Sun". Astrobiology 6 (2): 308–331. doi:10.1089/ast.2006.6.308. PMID 16689649. Bibcode: 2006AsBio...6..308P.
5. ^ [1]

External links

* "CD-27 14659 / HR 7722". SolStation. http://www.solstation.com/stars/hr7722.htm. Retrieved 2007-05-11.