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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]
Distance19.58 ± 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
Mass0.179 ± 0.002 M☉
Temperature3341±224[6] K
Metallicity [Fe/H]-0.41[5] dex
GJ 1005 B
Mass0.112 ± 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
SIMBADdata
ARICNSA
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]


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. S2CID 18759600.
  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. S2CID 54029447.
  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.
  5. 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: 63, arXiv:1811.06938, doi:10.3847/1538-4357/aaf3bc, S2CID 119372932
  6. M dwarf spectral indices at moderate resolution: accurate Teff and [Fe/H] for 178 southern stars, 2021, arXiv:2110.01658
  7. 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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