Gliese 908
Star in the constellation Pisces
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Gliese 908 is a red dwarf star, located in constellation Pisces at 19.3 light-years from Earth. It is a BY Draconis variable star with a variable star designation of BR Piscium. Its apparent magnitude varies between magnitude 8.93 and magnitude 9.03 as a result of starspots and varying chromospheric activity.
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Pisces |
| Right ascension | 23h 49m 12.52508s[2] |
| Declination | 02° 24′ 04.4055″[2] |
| Apparent magnitude (V) | 8.93 - 9.03[3] |
| Characteristics | |
| Spectral type | M1V Fe-1[4] |
| Variable type | BY Dra[3] |
| Astrometry | |
| Radial velocity (Rv) | −71.37±0.12[2] km/s |
| Proper motion (μ) | RA: +992.720 mas/yr[2] Dec.: −968.806 mas/yr[2] |
| Parallax (π) | 169.2163±0.0281 mas[2] |
| Distance | 19.275 ± 0.003 ly (5.9096 ± 0.0010 pc) |
| Absolute magnitude (MV) | +10.1[5] |
| Details | |
| Mass | 0.37[6] M☉ |
| Radius | 0.409±0.023[7] R☉ |
| Luminosity (bolometric) | 0.0253±0.0006[7] L☉ |
| Surface gravity (log g) | 4.86[8] cgs |
| Temperature | 3,600±100[7] K |
| Metallicity [Fe/H] | −0.51±0.05[9] dex |
| Rotation | 50.83±0.35[10] days |
| Rotational velocity (v sin i) | 2.25[11] km/s |
| Other designations | |
| BR Piscium, BD+01°4774, GJ 908[12], HIP 117473[13], SAO 128397, PPM 174453, G 29-68, G 31-6, LHS 550[14], LTT 17014, PLX 5763[15], TYC 586-610-1[16], GSC 00586-00610, IRAS 23466+0207, 2MASS J23491255+0224037, Lalande 46650 | |
| Database references | |
| SIMBAD | data |
  Gliese 908 Location of Gliese 908 in the constellation Pisces | |
The variability of Gliese 908 was confirmed in 1994, although no period could be detected in its brightness changes.[17] It was entered into the General Catalogue of Variable Stars in 1997.[18]
Gliese 908 is a cool main sequence star, a red dwarf, with a spectral class of M1V Fe-1. The suffix indicates a noticeable deficiency in heavy elements.[4]