Gliese 393
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Sextans |
| Right ascension | 10h 28m 55.551s |
| Declination | +00° 50′ 27.60″ |
| Apparent magnitude (V) | 9.65 |
| Characteristics | |
| Spectral type | M2V |
| U−B color index | 1.192 |
| B−V color index | 1.507±0.014 |
| Astrometry | |
| Radial velocity (Rv) | +8.34±0.10 km/s |
| Proper motion (μ) | RA: −602.992 mas/yr Dec.: −731.882 mas/yr |
| Parallax (π) | 142.0951±0.0212 mas |
| Distance | 22.953 ± 0.003 ly (7.038 ± 0.001 pc) |
| Absolute magnitude (MV) | 10.40 |
| Details | |
| Mass | 0.432±0.011 M☉ |
| Radius | 0.4459±0.0073 R☉ |
| Luminosity | 0.02687±0.00054 L☉ |
| Surface gravity (log g) | 4.88±0.07 cgs |
| Temperature | 3,579±51 K |
| Metallicity [Fe/H] | −0.09±0.16 dex |
| Rotation | 34.15±0.22 d |
| Rotational velocity (v sin i) | 1.5 km/s |
| Age | 3.28 Gyr |
| Other designations | |
| BD+01°2447, GJ 393, HIP 51317, LTT 12805, 2MASS J10285555+0050275 | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
Gliese 393, or GJ 393, is a single star with an orbiting exoplanet companion in the equatorial constellation of Sextans, positioned about 1.5° to the NNW of Beta Sextantis. At an apparent visual magnitude of 9.65, it is much too faint to be seen with the unaided eye. This star is located at a distance of 22.9 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +8.3 km/s. It has a large proper motion, traversing the celestial sphere at the rate of 0.950″ per year. The net velocity of this star relative to the Sun is 32.9 km/s. It shares a similar space motion as members of the AB Doradus moving group, but is considered a random interloper.
The stellar classification of GJ 393 is M2V, indicating this is a small red dwarf star that is generating energy through core hydrogen fusion. It is rotating slowly and appears to be chromospherically inactive, suggesting it is an older star; perhaps as much as 10 billion years old. The star has 43% of the mass of the Sun and 44.6% of the Sun's radius. The metallicity, what astronomers term the abundance of heavy elements, is lower than in the Sun. It is radiating just 2.7% of the Sun's luminosity from its photosphere at an effective temperature of 3,579 K.