Gliese 251
Location of Gliese 251 in the constellation Gemini | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Gemini |
| Right ascension | 06h 54m 48.95806s |
| Declination | +33° 16′ 05.4383″ |
| Apparent magnitude (V) | +10.11 |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | M3.0Ve |
| U−B color index | +1.20 |
| B−V color index | +1.60 |
| Astrometry | |
| Radial velocity (Rv) | 22.30±0.19 km/s |
| Proper motion (μ) | RA: -726.672 mas/yr Dec.: -398.102 mas/yr |
| Parallax (π) | 179.0629±0.0280 mas |
| Distance | 18.215 ± 0.003 ly (5.5846 ± 0.0009 pc) |
| Absolute magnitude (MV) | +11.12 |
| Details | |
| Mass | 0.360±0.015 M☉ |
| Radius | 0.364±0.011 R☉ |
| Luminosity | 0.01691±0.00028 L☉ |
| Surface gravity (log g) | 4.96±0.07 cgs |
| Temperature | 3451±51 K |
| Metallicity [Fe/H] | -0.03±0.16 dex |
| Rotation | 122.1+1.9 −2.2 d |
| Rotational velocity (v sin i) | ≤2 km/s |
| Age | 8.69 Gyr |
| Other designations | |
| GJ 251, HD 265866, HIP 33226, LHS 1879, LTT 11941, Wolf 294, 2MASS J06544902+3316058 | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| ARICNS | data |
Gliese 251, also known as HIP 33226 or HD 265866, is a star located 18.2 light-years away from the Solar System. Located in the constellation of Gemini, it is the nearest star in this constellation.: 84 It is located near the boundary with Auriga, 49 arcminutes away from the bright star Theta Geminorum; due to its apparent magnitude of +9.89 it cannot be observed with the naked eye. The closest star to Gliese 251 is QY Aurigae, which is located 3.5 light years away.
Gliese 251 is a red dwarf with a spectral type of M3V with an effective temperature of about 3300 K. Its mass has been measured to be around 0.36 solar masses and its radius is about 36% solar radii. Its metallicity is likely slightly less than that of the Sun. Observations at infrared wavelengths rule out the presence of a circumstellar disk around it.