Epoch J2000 Equinox J2000
|Right ascension||21h 57m 19.8477s|
|Declination||−37° 45′ 49.037″|
|Apparent magnitude (V)||7.48|
|Absolute magnitude (V)||4.25|
HD 208487 is a 7th magnitude G-type main sequence star located approximately 144 light-years away in the constellation of Grus. It has the same spectral type as our sun, G2V. However, it is probably slightly less massive and more luminous, indicating that it is slightly older. As of 2008, there is one known extrasolar planet confirmed to be orbiting the star.
The discovery of a second planet in the system was announced on September 13, 2005, by P.C. Gregory. The discovery was made using Bayesian analysis of the radial velocity dataset to determine the planetary parameters. However, further analysis revealed that an alternative 2-planet solution for the HD 208487 system was possible, with a planet in a 28-day orbit instead of the 908-day orbit postulated, and it was concluded that activity on the star is more likely to be responsible for the residuals to the one-planet solution than the presence of a second planet.
(in order from star)
|b||>0.520 ± 0.082 MJ||0.51 ± 0.02||130.08 ± 0.51||0.24 ± 0.16||—||—|
- Tinney, C. G.; et al. (2005). "Three Low-Mass Planets from the Anglo-Australian Planet Search". The Astrophysical Journal. 623 (2): 1171–1179. Bibcode:2005ApJ...623.1171T. doi:10.1086/428661.
- Gregory, P.C. (2006). "A Bayesian Kepler periodogram detects a second planet in HD 208487". MNRAS. 374 (4): 1321–1333. arXiv: . Bibcode:2007MNRAS.374.1321G. doi:10.1111/j.1365-2966.2006.11240.x.
- Wright, J.T.; et al. (2007). "Four New Exoplanets and Hints of Additional Substellar Companions to Exoplanet Host Stars". The Astrophysical Journal. 657 (1): 533–545. arXiv: . Bibcode:2007ApJ...657..533W. doi:10.1086/510553.
- "Notes for star HD 208487". The Extrasolar Planets Encyclopaedia. Retrieved 2008-08-29.
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