HD 2638
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| 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 | 0.89 ± 0.02[2] M☉ |
| Radius | 0.8 ± 0.01[2] R☉ |
| Luminosity | 0.407 ± 0.004[2] L☉ |
| Surface gravity (log g) | 4.58 ± 0.02[2] cgs |
| Temperature | 5160 ± 24[2] K |
| Metallicity [Fe/H] | 0.12 ± 0.05[3] dex |
| Age | 1.9 ± 2.6[2] Gyr |
| 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. HD 2638 is in a system with multiple stars, including at least HD 2567 and HD 2638 C. HD 2638 is 175.2 light-years (53.7parsec) from the Sun.[4]
Planetary system[edit]
In 2005 the discovery of an extrasolar planet HD 2638 b orbiting the star was announced by the Geneva Extrasolar Planet Search Team. The planet has a mass 0.48 of Jupiter and 152.6 the mass of Earth.[5]
| 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 | 0.0407 | — | — |
Sun comparison[edit]
This chart compares the Sun to HD 2638.
| Identifier | J2000 Coordinates | Distance (ly) |
Stellar Class |
Temperature (K) |
Metallicity (dex) |
Age (Gyr) |
Notes | |
|---|---|---|---|---|---|---|---|---|
| Right ascension | Declination | |||||||
| Sun | — | — | 0.00 | G2V | 5,778 | +0.00 | 4.6 | [6] |
| HD 2638 [7] | 00h 29m 59.87s | –05° 45′ 50.4″ | 175 | G5V | 5169 | 0.12 | 4.0 ± 3.8 | [3] |
See also[edit]
References[edit]
- ^ a b c d e 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 - ^ a b c d e f Bonfanti, A.; et al. (2015). "Revising the ages of planet-hosting stars". Astronomy and Astrophysics. 575. A18. arXiv:1411.4302. Bibcode:2015A&A...575A..18B. doi:10.1051/0004-6361/201424951.
- ^ a b M. Tsantaki1,2, S. G. Sousa1,3, V. Zh. Adibekyan1, N. C. Santos1,2, A. Mortier1,2, and G. Israelian (April 2013). "Deriving precise parameters for cool solar-type stars Optimizing the iron line list?" (PDF): page 4.
- ^ Open Exoplanet Catalogue, HD 2638
- ^ a b 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.
- ^ Williams, D.R. (2004). "Sun Fact Sheet". NASA. Retrieved 2009-06-23.
- ^ HD 2638 at SIMBAD - Ids - Bibliography - Image.
External links[edit]
Coordinates: 
00h 29m 59.87s, −05° 45′ 50.41″
 |
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