HD 2638
From Wikipedia, the free encyclopedia
| Observation data Epoch 2000 |
|
|---|---|
| Constellation | Cetus |
| Right ascension | 0h 29m 59.87s |
| Declination | -5° 45' 50.41" |
| Apparent magnitude (V) | 9.8 |
| Distance | 175.18 ly (53.71 pc) |
| Spectral type | G5 |
| Other designations | |
|
BD-06°82, HIP 2350
|
|
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.
In 2005 the discovery of an extrasolar planet orbiting the star was announced by the Geneva Extrasolar Planet Search Team.
[edit] HD 2638 b
| Extrasolar planet | Lists of extrasolar planets | |
|---|---|---|
| Orbital elements | ||
| Semimajor axis | (a) | 0.044 AU |
| Eccentricity | (e) | 0 |
| Orbital period | (P) | 3.4442 ± 0.0002 d |
| Inclination | (i) | ?° |
| Longitude of periastron |
(ω) | 0° |
| Time of periastron | (τ) | 2,453,323.206 ± 0.002 JD |
| Physical characteristics | ||
| Mass | (m) | >0.48 MJ |
| Radius | (r) | ? RJ |
| Density | (ρ) | ? kg/m3 |
| Temperature | (T) | ? K |
| Discovery information | ||
| Discovery date | 2005 | |
| Discoverer(s) | Moutou, Mayor, Bouchy et al. |
|
| Detection method | Radial velocity | |
| Discovery status | Confirmed | |
HD 2638 b is a planet of the star HD 2638. It is a typical "hot Jupiter", a planet that orbits its parent star in a very tight "torch orbit". Distance to the star is less than 1/20th Earth's distance from the Sun. One orbital revolution lasts only about three and half days.
[edit] References
- Moutou 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: 367-373.
[edit] External links
 |
This main sequence star-related article is a stub. You can help Wikipedia by expanding it. |
