Gliese 282

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^{[citation needed]} when viewed from Earth. It is not visible to the naked eye.

Gliese 282

Observation data Epoch J2000      Equinox 2000
Constellation	Monoceros[1]
Right ascension	07h 39m 59.329s[2]
Declination	−03° 35′ 51.03″[2]
Apparent magnitude (V)	7.30[3] + 9.01[3] + 9.87[4]
Characteristics
Spectral type	K2V[5] + K7V[6] + M1.5Ve[7]
Variable type	A: BY Dra[8]
Astrometry
A
Radial velocity (Rv)	−18.40±0.14[2] km/s
Proper motion (μ)	RA: +70.078[2] mas/yr Dec.: −278.117[2] mas/yr
Parallax (π)	71.0323±0.0243 mas[2]
Distance	45.92 ± 0.02 ly (14.078 ± 0.005 pc)
Absolute magnitude (MV)	+6.42[1]
Orbit[9]
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[2] R☉
Luminosity	0.29[2] L☉
Surface gravity (log g)	4.40[10] cgs
Temperature	4,956[10] K
Metallicity [Fe/H]	−0.12[10] dex
Rotational velocity (v sin i)	1.77[8] km/s
Age	300−350[7] Myr
Gl 282 B
Mass	0.64[11] M☉
Radius	0.73[11] R☉
Luminosity	0.11[11] L☉
Surface gravity (log g)	4.47[11] cgs
Temperature	3,874[11] K
Metallicity [Fe/H]	−0.25[12] dex
Age	680−720[7] Myr
Gl 282 Ca
Mass	0.539+0.008 −0.007[9] M☉
Radius	0.51±0.05[9] R☉
Luminosity	0.044±0.01[9] L☉
Rotation	12.2±0.1[9] days
Age	740±100[9] Myr
Gl 282 Cb
Mass	0.185±0.001[9] M☉
Other designations
Gl 282, HD 61606, HIP 37349, WDS J07400-0336, 2MASS J07395932-0335506, V869 Mon[13]
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

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°.^[3] This is equivalent to a projected physical separation of 824 AU.^[7]

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,^[7] 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.^[14]