GJ 357

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GJ 357
Observation data
Epoch J2000      Equinox J2000
Constellation Hydra
Right ascension  09h 36m 01.6373s[1]
Declination −21° 39′ 38.878″[1]
Apparent magnitude (V) 10.906[2]
Evolutionary stage main sequence
Spectral type M2.5V[3]
Radial velocity (Rv)−34.58[4] km/s
Proper motion (μ) RA: 138.694[1] mas/yr
Dec.: −990.311[1] mas/yr
Parallax (π)105.8830 ± 0.0569[1] mas
Distance30.80 ± 0.02 ly
(9.444 ± 0.005 pc)
Absolute magnitude (MV)+11.13[5]
Mass0.362[6] M
Radius0.333[5] R
Luminosity0.014[7] L
Surface gravity (log g)4.96[6] cgs
Temperature3,488[6] K
Metallicity [Fe/H]−0.14[6] dex
Rotational velocity (v sin i)2.5[6] km/s
Other designations
HIP 47103, 2MASS 09360161-2139371
Database references

GJ 357 (also designated Gliese 357) is an M-type main sequence star. Located 31 light-years from the Solar System,[8] the star has three confirmed exoplanets in its orbit,[9] one of which, GJ 357 d, is considered to be a "super-Earth" within the circumstellar habitable zone.[10][8][11][12] The system is part of the Hydra constellation.[8]


  1. ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  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. Bibcode:2010MNRAS.403.1949K. doi:10.1111/j.1365-2966.2009.16182.x.
  3. ^ Gray, R. O.; Corbally, C. J.; Garrison, R. F.; McFadden, M. T.; Bubar, E. J.; McGahee, C. E.; O'Donoghue, A. A.; Knox, E. R. (2006). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc-The Southern Sample". The Astronomical Journal. 132 (1): 161–170. arXiv:astro-ph/0603770. Bibcode:2006AJ....132..161G. doi:10.1086/504637.
  4. ^ Nidever, David L.; Marcy, Geoffrey W.; Butler, R. Paul; Fischer, Debra A.; Vogt, Steven S.; McGahee, C. E.; O'Donoghue, A. A.; Knox, E. R. (2002). "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. ^ a b Houdebine, E. R.; Mullan, D. J.; Paletou, F.; Gebran, M.; Bubar, E. J.; McGahee, C. E.; O'Donoghue, A. A.; Knox, E. R. (2016). "Rotation-Activity Correlations in K and M Dwarfs. I. Stellar Parameters and Compilations of v sin I and P/Sin I for a Large Sample of Late-K and M Dwarfs". The Astrophysical Journal. 822 (2): 97. arXiv:1604.07920. Bibcode:2016ApJ...822...97H. doi:10.3847/0004-637X/822/2/97.
  6. ^ a b c d e Passegger, V. M.; Reiners, A.; Jeffers, S. V.; Wende-von Berg, S.; Schöfer, P.; Caballero, J. A.; Schweitzer, A.; Amado, P. J.; Béjar, V. J. S.; Cortés-Contreras, M.; Hatzes, A. P.; Kürster, M.; Montes, D.; Pedraz, S.; Quirrenbach, A.; Ribas, I.; Seifert, W. (2018). "The CARMENES search for exoplanets around M dwarfs. Photospheric parameters of target stars from high-resolution spectroscopy". Astronomy and Astrophysics. 615: A6. arXiv:1802.02946. Bibcode:2018A&A...615A...6P. doi:10.1051/0004-6361/201732312.
  7. ^ Morales, J. C.; Ribas, I.; Jordi, C.; McFadden, M. T.; Bubar, E. J.; McGahee, C. E.; O'Donoghue, A. A.; Knox, E. R. (2008). "The effect of activity on stellar temperatures and radii". Astronomy and Astrophysics. 478 (2): 507. arXiv:0711.3523. Bibcode:2008A&A...478..507M. doi:10.1051/0004-6361:20078324.
  8. ^ a b c Reddy, Francis; Center, NASA’s Goddard Space Flight (2019-07-31). "TESS Discovers Habitable Zone Planet in GJ 357 System". SciTechDaily. Retrieved 2019-08-01.
  9. ^ "The Extrasolar Planet Encyclopaedia — Gj 357 b". exoplanet.eu. Retrieved 2019-08-01.
  10. ^ Falconer, Rebecca, Newly uncovered super-Earth 31 light-years away may be habitable, Axios, August 1, 2019
  11. ^ "Potentially habitable 'super-Earth' discovered just 31 light-years away". NBC News. Retrieved 2019-08-01.
  12. ^ Garner, Rob (2019-07-30). "NASA's TESS Helps Find Intriguing New World". NASA. Retrieved 2019-08-01.