| Observation data EpochJ2000 EquinoxJ2000 | |
|---|---|
| Constellation | Andromeda[1] |
| Right ascension | 00h 05m 10.8892s[2] |
| Declination | +45° 47′ 11.640″[2] |
| Apparent magnitude (V) | 9.949[3] |
| Characteristics | |
| Evolutionary stage | main sequence[3] |
| Spectral type | dM1.8[3] |
| U−Bcolor index | +1.18[4] |
| B−Vcolor index | +1.50[4] |
| Astrometry | |
| Radial velocity (Rv) | −0.39±0.09[5] km/s |
| Proper motion (μ) | RA: 870.753±0.057[2]mas/yr Dec.: −151.267±0.036[2]mas/yr |
| Parallax (π) | 86.9567±0.0407 mas[2] |
| Distance | 37.51 ± 0.02 ly (11.500 ± 0.005 pc) |
| Absolute magnitude (MV) | +9.65[3] |
| Details | |
| Mass | 0.50[6] M☉ |
| Radius | 0.508±0.027[3] R☉ |
| Luminosity | 0.041[6] L☉ |
| Surface gravity (log g) | 4.76[6] cgs |
| Temperature | 3,674[3] K |
| Metallicity[Fe/H] | −0.14[6] dex |
| Rotation | 15.37±0.09[7] days |
| Rotational velocity (v sin i) | 2.76[8] km/s |
| Age | <1[9] Gyr |
| Other designations | |
| HIP 428,GJ 2,CCDM J00057+4548F,WDS J00057+4549F | |
| Database references | |
| SIMBAD | data |
Gliese 2 is ared dwarf star in the constellationAndromeda.[1] The star is located at 11.5parsecs (38light-years) from Earth. It is often associated with thebinary star systemADS 48, with a similar distance and proper motions with this system, suggesting both may be gravitationally bound. However, it is moving faster than theescape velocity of the system, and its velocity is much faster than expected for a bound star, and thus it is not considered a companion of ADS 48.[10]
