GJ 1005

GJ 1005 is a system of two red dwarfs, located in constellation Cetus at 16.3 light-years from Earth.[5] The primary star is a M4V class star while the secondary is a class M7V.

GJ 1005

Observation data Epoch J2000      Equinox J2000
Constellation	Cetus
Right ascension	00^h 15^m 28.11090^s[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)	200.53 ± 9.41[1] mas
Distance	16.3 ± 0.8 ly (5.0 ± 0.2 pc)
Absolute magnitude (MV)	12.70 ± 0.01 / 15.12 ± 0.09[3]
Orbit[3]
Period (P)	1666.1 ± 2.5 d
Semi-major axis (a)	0.3037 ± 0.0005″
Eccentricity (e)	0.364 ± 0.001
Inclination (i)	146.1 ± 0.2°
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☉
GJ 1005 B
Mass	0.112 ± 0.001 M☉
Other designations
HIP 1242, G 158-50, G 266-76, LHS 1047, LP 764-87, LTT 114
Database references
SIMBAD	data
ARICNS	A
	B

Cetus Constellation map

The system was observed with the Hubble Space Telescope in the 1990s with its Fine Guidance Sensor.[5] This data helped determine the mass of each of the components of L722-22/ LHS 1047 / GJ 1005.[5]

References

1. van Leeuwen, F.; et al. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
2. Koen, C.; Kilkenny, D.; van Wyk, F.; Marang, F. (2010). "UBV(RI)_C JHK observations of Hipparcos-selected nearby stars". Monthly Notices of the Royal Astronomical Society. 403 (4): 1949–1968. Bibcode:2010MNRAS.403.1949K. doi:10.1111/j.1365-2966.2009.16182.x.
3. Benedict, G. F.; Henry, T. J.; Franz, O. G.; McArthur, B. E.; Wasserman, L. H.; Jao, Wei-Chun; Cargile, P. A.; Dieterich, S. B.; Bradley, A. J.; Nelan, E. P.; Whipple, A. L. (2016). "The Solar Neighborhood. XXXVII. The Mass–Luminosity Relation for Main-Sequence M Dwarfs". The Astronomical Journal. 152 (5): 141. arXiv:1608.04775. Bibcode:2016AJ....152..141B. doi:10.3847/0004-6256/152/5/141.
4. Nidever, David L.; et al. (2013). "Radial Velocities for 889 Late-Type Stars". The Astrophysical Journal Supplement Series. 141 (2): 503–522. arXiv:astro-ph/0112477. Bibcode:2002ApJS..141..503N. doi:10.1086/340570.
5. Hershey, John L.; Taff, L. G. (1998-01-01). "Hubble Space Telescope Fine Guidance Sensor Astrometry of the Low-Mass Binary L722-22". The Astronomical Journal. 116 (3): 1440. Bibcode:1998AJ....116.1440H. doi:10.1086/300516. ISSN 1538-3881.