GJ 1005

GJ 1005 is a system of two red dwarfs, located in constellation Cetus at 19.6 light-years from Earth.^[7] The primary star is a M4V class star while the secondary is a class M7V.^{[citation needed]}

GJ 1005

Observation data Epoch J2000      Equinox J2000
Constellation	Cetus
Right ascension	00h 15m 28.11090s[1]
Declination	−16° 08′ 01.6303″[1]
Apparent magnitude (V)	11.483[2]
Characteristics
Spectral type	M3.5V[3]
Astrometry
Radial velocity (Rv)	-26.43 ± 0.1[4] km/s
Proper motion (μ)	RA: 731.83[1] mas/yr Dec.: -607.73[1] mas/yr
Parallax (π)	166.6±0.3 mas[3]
Distance	19.58 ± 0.04 ly (6.00 ± 0.01 pc)
Absolute magnitude (MV)	12.70 ± 0.01 / 15.12 ± 0.09[3]
Orbit[3]
Period (P)	4.55726+0.00075 −0.00074 y.[5]
Semi-major axis (a)	0.3037 ± 0.0005″
Eccentricity (e)	0.36136+0.00097 −0.00098[5]
Inclination (i)	143.93+0.25 −0.24[5]°
Longitude of the node (Ω)	62.8 ± 0.4°
Periastron epoch (T)	JD 2449850.4 ± 0.8
Argument of periastron (ω) (secondary)	166.6 ± 0.5°
Details[3]
GJ 1005 A
Mass	0.179 ± 0.002 M☉
Radius	0.23 R☉
Temperature	3341±224[6] K
Metallicity [Fe/H]	-0.41[5] dex
GJ 1005 B
Mass	0.112 ± 0.001 M☉
Other designations
Gaia DR2 2368293487260807040, HIP 1242, G 158-50, G 266-76, LHS 1047, LP 764-87, LTT 114, 2MASS J00152799-1608008
Database references
SIMBAD	data
ARICNS	A
	B
GJ 1005 Location of GJ 1005 in the constellation Cetus

The system was observed with the Hubble Space Telescope in the 1990s with its Fine Guidance Sensor.^[7] This data helped determine the mass of each of the components of L722-22/ LHS 1047 / GJ 1005.^[7]