| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Pisces[a] |
| Right ascension | 23h 35m 00.27674s[1] |
| Declination | +01° 36′ 19.4347″[1] |
| Apparent magnitude (V) | 9.546[1] |
| Characteristics | |
| A | |
| Evolutionary stage | Main sequence |
| Spectral type | K5-7[2] |
| B−V color index | 1.35[3] |
| B | |
| Evolutionary stage | Main sequence |
| Spectral type | M3-4[2] |
| C | |
| Evolutionary stage | Main sequence |
| Spectral type | M5-6[2] |
| Astrometry | |
| Radial velocity (Rv) | −10.44±0.44[4] km/s |
| Proper motion (μ) | RA: 340.029 mas/yr[4] Dec.: 28.456 mas/yr[4] |
| Parallax (π) | 47.9641 ± 0.0236 mas[4] |
| Distance | 68.00 ± 0.03 ly (20.85 ± 0.01 pc) |
| Absolute magnitude (MV) | 7.95[b] |
| Details | |
| A | |
| Mass | 0.64 – 0.67[2] M☉ |
| Radius | 0.716±0.021[5] R☉ |
| Luminosity | 0.12±0.005[4] L☉ |
| Temperature | 4,079±180[2] K |
| Metallicity [Fe/H] | 0.02[6] dex |
| Rotation | 11.9[7] days |
| Age | 200±50[7] Myr |
| B | |
| Mass | 0.28 – 0.34[2] M☉ |
| C | |
| Mass | 0.16 – 0.24[2] M☉ |
| Orbit | |
| Primary | A |
| Companion | BC |
| Period (P) | ≈80[2] yr |
| Orbit[6] | |
| Primary | B |
| Companion | C |
| Period (P) | 36 yr |
| Semi-major axis (a) | 444 mas (9.217 AU)[c] |
| Eccentricity (e) | 0.136 |
| Inclination (i) | 82.21° |
| Argument of periastron (ω) (secondary) | 109.8° |
| Position (relative to A)[2] | |
| Epoch of observation | December 2006 |
| Angular distance | 751 (A–B) 708 (A–C) 51 (B–C) mas |
| Position angle | 342.5 (A–B) 344.7 (A–C) 130.3 (B–C)° |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
Gliese 900 (GJ 900, BD+00 5017) is a triple star system, located 68 light-years from Earth in the constellation Pisces. It is made up of three main sequence stars: one is a K-type star, the two others are M-dwarf stars. The two M-dwarfs form a binary system with a period of 36 years, and this system has a period of 80 years around the primary component. With an apparent magnitude of 9.546, Gliese 900 is not visible to the naked eye. A widely separated planet has been detected around the system.[7]
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