Gliese 436
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| Observation data Equinox 2000 |
|
|---|---|
| Constellation | Leo |
| Right ascension | 11h 42m 11.09s |
| Declination | +26° 42' 23.65" |
| Apparent magnitude (V) | 10.68 |
| Distance | 33.48 ly (10.27 pc) |
| Spectral type | M2.5 V |
| Other designations | |
|
Ross 905, HIP 57087, G120-068, GCTP 2704.10, LHS 310, AC+27:28217,
Vyssotsky 616 |
|
Gliese 436 (Gl 436), is a dim 11th magnitude red dwarf star about 30 light years from Earth in the constellation of Leo. It is orbited by at least one planet with evidence from the Radial velocity measurements indicating a possible additional companion of unknown mass orbiting further out.
Contents |
[edit] Gliese 436 b
| Extrasolar planet | Lists of extrasolar planets | |
|---|---|---|
| Orbital elements | ||
| Semimajor axis | (a) | 0.0285 AU |
| Eccentricity | (e) | 0.16±0.019 |
| Orbital period | (P) | 2.64385±0.00009 d |
| Inclination | (i) | ?° |
| Longitude of periastron |
(ω) | 351±1.2° |
| Time of periastron | (τ) | 2,451,551.716 ±0.01 JD |
| Physical characteristics | ||
| Mass | (m) | >0.0713±0.006 MJ |
| Radius | (r) | ? RJ |
| Density | (ρ) | ? kg/m3 |
| Temperature | (T) | ? K |
| Discovery information | ||
| Discovery date | 2004 | |
| Discoverer(s) | Butler, Vogt, Marcy et al. |
|
| Detection method | Radial velocity | |
| Discovery status | Published | |
The planet, Gliese 436 b was discovered orbiting the star in 2004. It has a mass similar to Neptune's, but orbits very close to the star and may not be a small gas giant but a very massive terrestrial planet instead. It is one of the smallest extrasolar planets discovered so far. One orbit around the star takes only about 2 days 15.5 hours. The planet's surface temperature is high, but not as high as other planets in similar orbits because the star is so dim and cool.
[edit] See also
[edit] References
- Butler et al. (2004). "A Neptune-Mass Planet Orbiting the Nearby M Dwarf GJ 436". The Astrophysical Journal 617: 580-588.
- Maness et al. (2006). "The M Dwarf GJ 436 and its Neptune-Mass Planet". Submitted to Publications of the Astronomical Society of the Pacific.
[edit] External links
- LHS 310. SIMBAD. Retrieved on April 14, 2007.
- Notes for star GJ 436. The Extrasolar Planets Encyclopaedia. Retrieved on April 14, 2007.
- Scientists discover first of a new class of extrasolar planets – NASA Press Release (August 31, 2004)
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