| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Pyxis |
| Right ascension | 08h 40m 59.21s |
| Declination | –23° 27′ 22.6″ |
| Apparent magnitude (V) | 12.0 |
| Distance | 49.9 ly (15.3 pc) |
| Spectral type | M3.5V |
| Other designations | |
| Database references | |
| SIMBAD | data |
Gliese 317 is a red dwarf star approximately 50 light-years away in the constellation of Pyxis. The star has an apparent magnitude of 12, an absolute magnitude of 12.2, and corresponding to visual luminosity of 0.1% Sun. As of 2007, at least one extrasolar planet has been confirmed to be orbiting the star.
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Announced in 2007, a jovian planet (designated Gliese 317 b) was confirmed to orbit the star.[1] The planet orbits about 95% the distance between Earth to the Sun. Despite of this, it takes about 1.9 years, corresponding to slow orbital velocity of 14.82 km/s.
There is a possible second planet in the system; if it exists, the orbital parameters would change for the first planet. It would have an orbital period of 673.4 days and eccentricity of 0.25. A stability analysis on this putative system constrained its orbits to a 4:1 mean motion resonance.[2]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity |
|---|---|---|---|---|
| b | >1.2 MJ | 0.95 | 692.9 ± 4 | 0.193 ± 0.06 |
| c (unconfirmed) | 0.83 MJ | ~2.4[3] | ~2700 | ~0.42 |
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