Gliese 581
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| Observation data Epoch J2000.0 |
|
|---|---|
| Constellation | Libra |
| Right ascension | 15h 19m 26s |
| Declination | -07° 43' 20" |
| Apparent magnitude (V) | +10.55 |
| Distance | 20.40 ly (6.26 pc) |
| Spectral type | M2.5V |
| Other designations | |
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HO Librae, HIP 74995
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Gliese 581 is an M2.5V red dwarf star located 20.40 ly away in the constellation Libra. It has the variable star designation HO Librae. In 2005, an exoplanet was found around the star.
[edit] Planetary system
Gliese 581 b is a Neptune-mass planet. It was the fifth planet to be discovered around a red dwarf star. Little is known about it besides some of its orbital parameters and a lower limit on its mass.
| Companion (In order from star) |
Mass (MJ) |
Orbital period (days) |
Semimajor axis (AU) |
Eccentricity |
|---|---|---|---|---|
| b | >0.056 | 5.366 | 0.041 | 0.00 |
[edit] References
- Bonfils et al. (2005). "The HARPS search for southern extra-solar planets, VI. A Neptune-mass planet around the nearby M dwarf Gl 581". Astronomy and Astrophysics 443: L15-L18.
[edit] External links
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