Astronomy:GJ 357
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Hydra |
| Right ascension | 09h 36m 01.6373s[1] |
| Declination | −21° 39′ 38.878″[1] |
| Apparent magnitude (V) | 10.906[2] |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | M2.5V[3] |
| Astrometry | |
| 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 |
| Distance | 30.80 ± 0.02 ly (9.444 ± 0.005 pc) |
| Absolute magnitude (MV) | +11.13[5] |
| Details | |
| Mass | 0.362[6] M☉ |
| Radius | 0.333[5] R☉ |
| Luminosity | 0.014[7] L☉ |
| Surface gravity (log g) | 4.96[6] cgs |
| Temperature | 3,488[6] K |
| Metallicity [Fe/H] | −0.14[6] dex |
| Rotational velocity (v sin i) | 2.5[6] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
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]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 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. doi:10.1111/j.1365-2966.2009.16182.x. Bibcode: 2010MNRAS.403.1949K.
- ↑ 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. doi:10.1086/504637. Bibcode: 2006AJ....132..161G.
- ↑ 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. doi:10.1086/340570. Bibcode: 2002ApJS..141..503N.
- ↑ 5.0 5.1 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. doi:10.3847/0004-637X/822/2/97. Bibcode: 2016ApJ...822...97H.
- ↑ 6.0 6.1 6.2 6.3 6.4 Passegger, V. M.; Reiners, A.; Jeffers, S. V.; Wende-von Berg, S.; Schöfer, P.; Caballero, J. A.; Schweitzer, A.; Amado, P. J. et al. (2018). "The CARMENES search for exoplanets around M dwarfs. Photospheric parameters of target stars from high-resolution spectroscopy". Astronomy and Astrophysics 615: A6. doi:10.1051/0004-6361/201732312. Bibcode: 2018A&A...615A...6P.
- ↑ 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. doi:10.1051/0004-6361:20078324. Bibcode: 2008A&A...478..507M.
- ↑ 8.0 8.1 8.2 Reddy, Francis; Center, NASA’s Goddard Space Flight (2019-07-31). "TESS Discovers Habitable Zone Planet in GJ 357 System" (in en-US). https://scitechdaily.com/tess-discovers-habitable-zone-planet-in-gj-357-system/.
- ↑ "The Extrasolar Planet Encyclopaedia — Gj 357 b". http://exoplanet.eu/catalog/gj_357_b/.
- ↑ Falconer, Rebecca, Newly uncovered super-Earth 31 light-years away may be habitable, Axios, August 1, 2019
- ↑ "Potentially habitable 'super-Earth' discovered just 31 light-years away" (in en). https://www.nbcnews.com/mach/science/potentially-habitable-super-earth-discovered-just-31-light-years-away-ncna1037491.
- ↑ Garner, Rob (2019-07-30). "NASA's TESS Helps Find Intriguing New World". http://www.nasa.gov/feature/goddard/2019/confirmation-of-toasty-tess-planet-leads-to-surprising-find-of-promising-world.
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