HD 2638
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cetus |
| Right ascension | 00h 29m 59.87s[1] |
| Declination | –05° 45′ 50.4″[1] |
| Apparent magnitude (V) | 9.8 |
| Characteristics | |
| Spectral type | G5V |
| Astrometry | |
| Proper motion (μ) | RA: –105.63 ± 1.74[1] mas/yr Dec.: –223.46 ± 1.0[1] mas/yr |
| Parallax (π) | 20.03 ± 1.49[1] mas |
| Distance | 160 ± 10 ly (50 ± 4 pc) |
| Details | |
| Mass | 0.90 ± 0.10[2] M☉ |
| Radius | 0.80 ± 0.09[2] R☉ |
| Luminosity | 0.43[2] L☉ |
| Surface gravity (log g) | 4.38 ± 0.19[2] cgs |
| Temperature | 5,236 ± 70[2] K |
| Metallicity [Fe/H] | 0.22 ± 0.05[2] dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| Extrasolar Planets Encyclopaedia | data |
HD 2638 is a dim 10th magnitude star in the constellation of Cetus. It is a yellow dwarf and similar to our Sun. A small telescope is required to view the star.
Planetary system
In 2005 the discovery of an extrasolar planet HD 2638 b orbiting the star was announced by the Geneva Extrasolar Planet Search Team.[3]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | >0.48 MJ | 0.044 | 3.4442 ± 0.0002 | 0 | — | — |
See also
References
- 1 2 3 4 5 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
- 1 2 3 4 5 6 Ghezzi, L.; et al. (September 2010), "Stellar Parameters and Metallicities of Stars Hosting Jovian and Neptunian Mass Planets: A Possible Dependence of Planetary Mass on Metallicity", The Astrophysical Journal 720 (2): 1290–1302, arXiv:1007.2681, Bibcode:2010ApJ...720.1290G, doi:10.1088/0004-637X/720/2/1290.
- 1 2 Moutou, C.; et al. (2005). "The HARPS search for southern extra-solar planets IV. Three close-in planets around HD 2638, HD 27894 and HD 63454". Astronomy and Astrophysics 439 (1): 367–373. Bibcode:2005A&A...439..367M. doi:10.1051/0004-6361:20052826.
External links
Coordinates: 
00h 29m 59.87s, −05° 45′ 50.41″
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