Gliese 282
| Observation data Epoch J2000 Equinox 2000 | |
|---|---|
| Constellation | Monoceros |
| Right ascension | 07h 39m 59.329s |
| Declination | −03° 35′ 51.03″ |
| Apparent magnitude (V) | 7.30 + 9.01 + 9.87 |
| Characteristics | |
| Spectral type | K2V + K7V + M1.5Ve |
| Variable type | A: BY Dra |
| Astrometry | |
| A | |
| Radial velocity (Rv) | −18.40±0.14 km/s |
| Proper motion (μ) | RA: +70.078 mas/yr Dec.: −278.117 mas/yr |
| Parallax (π) | 71.0323±0.0243 mas |
| Distance | 45.92 ± 0.02 ly (14.078 ± 0.005 pc) |
| Absolute magnitude (MV) | +6.42 |
| Orbit | |
| Primary | Ca |
| Companion | Cb |
| Period (P) | 18.254+0.116 −0.117 yr |
| Eccentricity (e) | 0.227±0.001 |
| Inclination (i) | 93.137+0.087 −0.086° |
| Longitude of the node (Ω) | 136.616+0.165 −0.167° |
| Argument of periastron (ω) (secondary) | 181.395+0.738 −0.736° |
| Details | |
| Gl 282 A | |
| Radius | 0.78 R☉ |
| Luminosity | 0.29 L☉ |
| Surface gravity (log g) | 4.40 cgs |
| Temperature | 4,956 K |
| Metallicity [Fe/H] | −0.12 dex |
| Rotational velocity (v sin i) | 1.77 km/s |
| Age | 300−350 Myr |
| Gl 282 B | |
| Mass | 0.64 M☉ |
| Radius | 0.73 R☉ |
| Luminosity | 0.11 L☉ |
| Surface gravity (log g) | 4.47 cgs |
| Temperature | 3,874 K |
| Metallicity [Fe/H] | −0.25 dex |
| Age | 680−720 Myr |
| Gl 282 Ca | |
| Mass | 0.539+0.008 −0.007 M☉ |
| Radius | 0.51±0.05 R☉ |
| Luminosity | 0.044±0.01 L☉ |
| Rotation | 12.2±0.1 days |
| Age | 740±100 Myr |
| Gl 282 Cb | |
| Mass | 0.185±0.001 M☉ |
| Other designations | |
| Gl 282, HD 61606, HIP 37349, WDS J07400-0336, 2MASS J07395932-0335506, V869 Mon | |
| Gl 282 A: BD−03°2001, SAO 134954 | |
| Gl 282 B: BD−03°2002, SAO 134958 | |
| Gl 282 C: G 112-29, NLTT 18149 | |
| Database references | |
| SIMBAD | AB |
| A | |
| B | |
| C | |
| ARICNS | A |
| B | |
| C | |
Gliese 282 is a star system composed of four stars in the equatorial constellation of Monoceros. At a distance of 46 light years, this star has an apparent magnitude of 7.26 when viewed from Earth. It is not visible to the naked eye.
The Gl 282AB star system is composed of two K- type main-sequence stars. The primary component, Gliese 282A, is a BY Draconis type variable star with a stellar classification of K2V. It has an effective temperature of 4,956 K. The companion, Gliese 282B, is a smaller, class K5V star. As of 2003, the pair had an angular separation of 58.30 arc seconds along a position angle of 113°. This is equivalent to a projected physical separation of 824 AU.
There is a distant common proper motion companion (G 112-29) at an angular separation of 1.09°. At the estimated distance of Gl 282AB, this corresponds to a projected separation of 55,733 AU (0.88128 light-years), making it one of the widest known physical companions. Initially believed to be a red dwarf star with a stellar classification of M1.5Ve, it turned out to be a pair of red dwarfs (Ca and Cb) with masses 0.55M☉ and 0.19M☉, orbiting each other on 6591+136
−177 days orbit.