GJ 1002

GJ 1002 (or Gliese 1002) is a nearby red dwarf star, located 15.8 light-years (4.8 parsecs) away from the Solar System in the constellation of Cetus. The star has 12% the mass and 14% the radius of the Sun, and a temperature of 3,024 K (2,751 °C; 4,984 °F). It hosts a system of two known exoplanets.[4]

GJ 1002

A light curve for GJ 1002, plotted from TESS data[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Cetus[2]
Right ascension 00h 06m 43.19732s[3]
Declination −07° 32 17.0191[3]
Apparent magnitude (V) 13.837±0.003[4]
Characteristics
Evolutionary stage Main sequence
Spectral type M5.5V[4]
Apparent magnitude (V) 13.837±0.003[4]
Apparent magnitude (G) 11.774±0.003[3]
Apparent magnitude (J) 8.323±0.019[4]
Apparent magnitude (H) 7.792±0.034[5]
Apparent magnitude (K) 7.439±0.021[5]
Astrometry
Radial velocity (Rv)−40.46±0.30[3] km/s
Proper motion (μ) RA: −811.566 mas/yr[3]
Dec.: −1893.251 mas/yr[3]
Parallax (π)206.3500 ± 0.0474 mas[3]
Distance15.806 ± 0.004 ly
(4.846 ± 0.001 pc)
Details[4]
Mass0.120±0.010 M
Radius0.137±0.005 R
Luminosity (bolometric)0.001406±0.000019 L
Surface gravity (log g)5.10±0.06 cgs
Temperature3024±52 K
Metallicity [Fe/H]−0.25±0.19 dex
Rotation126±15 d
Other designations
NSV 15022, GJ 1002, G 158-27, LHS 2, NLTT 248, PLX 9.01, PM 00042-0747, TIC 176287658, 2MASS J00064325-0732147[5]
Database references
SIMBADdata

Planetary system

Two planetary companions to GJ 1002 were discovered in 2022 via radial velocity. Both have minimum masses close to that of Earth and orbit within the habitable zone of their star. While these planets do not transit their host star, it may be possible to determine the presence and composition of atmospheres with future instruments such as the ANDES spectrograph for the Extremely Large Telescope.[4]

The GJ 1002 planetary system[4]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b ≥1.08±0.13 M🜨 0.0457±0.0013 10.3465±0.027
c ≥1.36±0.17 M🜨 0.0738±0.0021 21.202±0.013

See also

References

  1. "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 28 May 2023.
  2. "Finding the constellation which contains given sky coordinates". djm.cc. 2 August 2008.
  3. Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  4. Suárez Mascareño, A.; González-Alvarez, E.; et al. (December 2022). "Two temperate Earth-mass planets orbiting the nearby star GJ 1002". Astronomy & Astrophysics. 670: A5. arXiv:2212.07332. Bibcode:2023A&A...670A...5S. doi:10.1051/0004-6361/202244991. S2CID 254353639.
  5. "GJ 1002". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 28 November 2022.
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