Gliese 317
Gliese 317 is a small red dwarf star with two exoplanetary companions in the southern constellation of Pyxis. It is located at a distance of 49.6 light-years from the Sun based on parallax measurements, and is drifting further away with a radial velocity of +87.8 km/s. This star is too faint to be viewed with the naked eye, having an apparent visual magnitude of 11.98 and an absolute magnitude of 11.06.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Pyxis |
| Right ascension | 08h 40m 59.2056s |
| Declination | −23° 27′ 22.5986″ |
| Apparent magnitude (V) | 11.98 |
| Characteristics | |
| Spectral type | M2.5V |
| V−R color index | 0.338 |
| Astrometry | |
| Radial velocity (Rv) | 87.8 km/s |
| Proper motion (μ) | RA: −461.162±0.139 mas/yr Dec.: 805.571±0.126 mas/yr |
| Parallax (π) | 65.7744 ± 0.0557 mas |
| Distance | 49.59 ± 0.04 ly (15.20 ± 0.01 pc) |
| Absolute magnitude (MV) | 11.06±0.04 |
| Details | |
| Mass | 0.42±0.05 M☉ |
| Radius | 0.4170±0.0013 R☉ |
| Luminosity | 0.02175±0.00034 L☉ |
| Temperature | 3,510±50 K |
| Metallicity [Fe/H] | +0.3 dex |
| Rotation | 69 days |
| Age | ~5 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
This is an M-type main-sequence star with a stellar classification of M2.5V. Photometric calibrations and infrared spectroscopic measurements indicate that the star is enriched in heavy elements compared to the Sun. The star is estimated to be roughly five billion years old and has a low activity level for a star of its class. It has 42% of the mass and radius of the Sun and is spinning with a rotation period of 69 days. The star is radiating 2.2% of the Sun's luminosity from its photosphere at an effective temperature of 3,510 K.