GJ 1005

GJ 1005
Observation data; Epoch J2000 Equinox J2000
Constellation	Cetus
Right ascension	00h 15m 28.11090s
Declination	−16° 08′ 01.6303″
Apparent magnitude (V)	11.483
Characteristics
Spectral type	M3.5V
Astrometry
Radial velocity (Rv)	-26.43 ± 0.1 km/s
Proper motion (μ)	RA: 731.83 mas/yr ; Dec.: -607.73 mas/yr
Parallax (π)	166.6±0.3 mas
Distance	19.58 ± 0.04 ly ; (6.00 ± 0.01 pc)
Absolute magnitude (MV)	12.70 ± 0.01 / 15.12 ± 0.09
Orbit
Period (P)	4.55726+0.00075; −0.00074 y.
Semi-major axis (a)	0.3037 ± 0.0005″
Eccentricity (e)	0.36136+0.00097; −0.00098
Inclination (i)	143.93+0.25; −0.24°
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
GJ 1005 A
Mass	0.179 ± 0.002 M☉
Radius	0.23 R☉
Temperature	3341±224 K
Metallicity [Fe/H]	-0.41 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 ;

Last updated June 24, 2025

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 ]}

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]

References

1 2 3 4 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. S2CID 18759600.
↑ 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 .
1 2 3 4 5 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 . S2CID 54029447.
↑ 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. S2CID 51814894.
1 2 3 4 Mann, Andrew W.; Dupuy, Trent; Kraus, Adam L.; Gaidos, Eric; Ansdell, Megan; Ireland, Michael; Rizzuto, Aaron C.; Hung, Chao-Ling; Dittmann, Jason; Factor, Samuel; Feiden, Gregory; Martinez, Raquel A.; Ruíz-Rodríguez, Dary; Chia Thao, Pa (2019), "How to Constrain Your M Dwarf. II. The Mass–Luminosity–Metallicity Relation from 0.075 to 0.70 Solar Masses", The Astrophysical Journal, 871 (1): 63, arXiv: 1811.06938 , Bibcode:2019ApJ...871...63M, doi: 10.3847/1538-4357/aaf3bc , S2CID 119372932
↑ Costa-Almeida, Ellen; De Mello, Gustavo F Porto; Giribaldi, Riano E.; Lorenzo-Oliveira, Diego; Ubaldo-Melo, Maria L. (2021), "M dwarf spectral indices at moderate resolution: Accurate Teff and [Fe/H] for 178 southern stars", Monthly Notices of the Royal Astronomical Society, 508 (4): 5148–5162, arXiv: 2110.01658 , doi: 10.1093/mnras/stab2831
1 2 3 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.

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[HIP-1] 1 2 3 4 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. S2CID 18759600.

[Koen-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 .

[Benedict-3] 1 2 3 4 5 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 . S2CID 54029447.

[Nidever-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. S2CID 51814894.

[Mann2018-5] 1 2 3 4 Mann, Andrew W.; Dupuy, Trent; Kraus, Adam L.; Gaidos, Eric; Ansdell, Megan; Ireland, Michael; Rizzuto, Aaron C.; Hung, Chao-Ling; Dittmann, Jason; Factor, Samuel; Feiden, Gregory; Martinez, Raquel A.; Ruíz-Rodríguez, Dary; Chia Thao, Pa (2019), "How to Constrain Your M Dwarf. II. The Mass–Luminosity–Metallicity Relation from 0.075 to 0.70 Solar Masses", The Astrophysical Journal, 871 (1): 63, arXiv: 1811.06938 , Bibcode:2019ApJ...871...63M, doi: 10.3847/1538-4357/aaf3bc , S2CID 119372932

[6] Costa-Almeida, Ellen; De Mello, Gustavo F Porto; Giribaldi, Riano E.; Lorenzo-Oliveira, Diego; Ubaldo-Melo, Maria L. (2021), "M dwarf spectral indices at moderate resolution: Accurate Teff and [Fe/H] for 178 southern stars", Monthly Notices of the Royal Astronomical Society, 508 (4): 5148–5162, arXiv: 2110.01658 , doi: 10.1093/mnras/stab2831

[Hershey-7] 1 2 3 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.

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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 (R_v)	-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 (M_V)	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