Phi2 Pavonis
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Pavo |
| Right ascension | 20h 40m 02.64s |
| Declination | −60° 32′ 40″ |
| Apparent magnitude (V) | +5.12 |
| Characteristics | |
| Spectral type | F8V |
| Astrometry | |
| Distance | 81.6 ly (25 pc) |
| Details | |
| Radius | 1.87 R☉ |
| Temperature | 6200 K |
| Metallicity | −0.44 Fe/H[1] |
| Rotation | 7 days? |
| Age | 5 Gyr years |
| Other designations | |
HD 196378, HIP 101983, HR 7875, Gl 794.2, GJ 9701 | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
Phi2 Pavonis (φ2 Pav, φ2 Pavonis), also known as HD 196378, is a yellow-white dwarf star approximately 82 light-years away in the constellation of Pavo (the Peacock). It is evolving into a subgiant.
This system was in 1991 a test case for the Zeta Herculis moving group, of low metallicity stars with 5 billion years of age. This group includes besides Zeta Herculis: δ Trianguli, ζ Reticuli, 1 Hydrae, Gl 456, Gl 678, and Gl 9079.[2]
In 1998, using the European Southern Telescope in Chile, a planet was announced to be orbiting the star.[3] This team retracted this claim in 2002, but found a different periodicity of 7 days possibly due to stellar rotation.[4]
See also
References
- ↑ Edvardsson, B.; Andersen, J.; Gustafsson, B.; et al. (1993). "The chemical evolution of the galactic disk I. Analysis and results". Astronomy and Astrophysics (275): 101.
- ↑ G. F. Porto de Mello; L. da Silva (1991). "On the physical existence of the Zeta HER moving group – A detailed analysis of Phi exp 2 Pavonis". Astronomical Journal. 102: 1816–1825. Bibcode:1991AJ....102.1816P. doi:10.1086/116006.
- ↑ M. Kürster (1998). "The ESO radial velocity planet search program". Workshop: Science with Gemini. CiteSeerX 10.1.1.53.4018
. - ↑ M. Endl; M. Kürster; et al. (2002). "The planet search program at the ESO Coudé Echelle spectrometer III. The complete Long Camera survey results". Astronomy & Astrophysics. 392 (2): 671–690. arXiv:astro-ph/0207512. Bibcode:2002A&A...392..671E. doi:10.1051/0004-6361:20020937.
External links
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