# Gliese 357

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Red dwarf with low starspot activity in the Hydra constellation

Gliese 357 Artist concept of the Gliese 357 (GJ357) system. Credit: Jack Madden Observation data Epoch J2000 Equinox J2000 Constellation Hydra[1] Right ascension 09h 36m 01.63722s[2] Declination −21° 39′ 38.8776″[2] Apparent magnitude (V) 10.906[3] Characteristics Evolutionary stage main sequence[4] Spectral type M2.5V[5] Astrometry Radial velocity (Rv) −35.03±0.17[2] km/s Proper motion (μ) RA: 138.722(23) mas/yr[2] Dec.: −990.342(20) mas/yr[2] Parallax (π) 105.9789±0.0227 mas[2] Distance 30.776 ± 0.007 ly (9.436 ± 0.002 pc) Absolute magnitude (MV) +11.13[6] Details Mass 0.346±0.007[7] M☉ Radius 0.360±0.011[7] R☉ Luminosity 0.014[8] L☉ Surface gravity (log g) 4.86±0.03[7] cgs Temperature 3,488[4] K Metallicity [Fe/H] −0.12±0.12[7] dex Rotation 74.3±1.7 d[9] Rotational velocity (v sin i) 2.5[4] km/s Other designations HIP 47103, TOI-562, 2MASS 09360161-2139371 Database references SIMBAD data Exoplanet Archive data ARICNS data

**GJ 357** (**Gliese 357**) is an [M-type main sequence star](/source/M-type_main_sequence_star) with an unusually low star spot activity.[10] It is located 31 light-years from the [Solar System](/source/Solar_System),[11] in the [Hydra constellation](/source/Hydra_(constellation)).[11]

## Planetary system

The star has three confirmed [exoplanets](/source/Exoplanets) in its orbit. [12] One of these, [Gliese 357 d](/source/Gliese_357_d), is considered to be a "[super-Earth](/source/Super-Earth)" within the [circumstellar habitable zone](/source/Circumstellar_habitable_zone).[13][11][14][15]

Transmission spectroscopy of the planet b with [JWST](/source/James_Webb_Space_Telescope) in 2025 found no clear evidence for atmospheric molecules, although a secondary atmosphere is considered likely to exist.[16] Similarly, another 2025 analysis of the JWST transmission spectrum found no atmospheric molecules, but was able to rule out an atmosphere composed mainly of low-[molar mass](/source/Molar_mass) molecules (less than 8 g/mol) and an abundance of [metals](/source/Metallicity) less than 300 times that of the Sun.[17]

The Gliese 357 planetary system[18] Companion (in order from star) Mass Semimajor axis (AU) Orbital period (days) Eccentricity Inclination (°) Radius b 1.83±0.30[7] M🜨 0.035±0.002 3.93072+0.00008 −0.00006 0.047+0.059 −0.047 89.12+0.37 −0.31 1.21±0.05[7] R🜨 c ≥3.40±0.46 M🜨 0.061±0.004 9.1247+0.0011 −0.0010 0.072±0.053 — — d ≥6.1±1.0 M🜨 0.204±0.015 55.661±0.055 0.033+0.057 −0.033 — —

## References

1. **[^](#cite_ref-1)** [Roman, Nancy G.](/source/Nancy_Roman) (1987). ["Identification of a constellation from a position"](https://doi.org/10.1086%2F132034). *[Publications of the Astronomical Society of the Pacific](/source/Publications_of_the_Astronomical_Society_of_the_Pacific)*. **99** (617): 695. [Bibcode](/source/Bibcode_(identifier)):[1987PASP...99..695R](https://ui.adsabs.harvard.edu/abs/1987PASP...99..695R). [doi](/source/Doi_(identifier)):[10.1086/132034](https://doi.org/10.1086%2F132034). [Constellation record for this object](https://vizier.cds.unistra.fr/viz-bin/VizieR-4?source=VI%2F42%2Fout&%2F%2Ftables=VI%2F42%2Fout&-c=GJ+357&-c.eq=J2000&-c.r=++2&-c.u=arcmin&-c.geom=r&-source=&-source=VI%2F42%2Fout&-out=RA1875&-out=DE1875&-out=Cst) at [VizieR](/source/VizieR).

1. ^ [***a***](#cite_ref-GaiaDR3_2-0) [***b***](#cite_ref-GaiaDR3_2-1) [***c***](#cite_ref-GaiaDR3_2-2) [***d***](#cite_ref-GaiaDR3_2-3) [***e***](#cite_ref-GaiaDR3_2-4) Vallenari, A.; et al. (Gaia collaboration) (2023). ["*Gaia* Data Release 3. Summary of the content and survey properties"](https://doi.org/10.1051%2F0004-6361%2F202243940). *Astronomy and Astrophysics*. **674**: A1. [arXiv](/source/ArXiv_(identifier)):[2208.00211](https://arxiv.org/abs/2208.00211). [Bibcode](/source/Bibcode_(identifier)):[2023A&A...674A...1G](https://ui.adsabs.harvard.edu/abs/2023A&A...674A...1G). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/202243940](https://doi.org/10.1051%2F0004-6361%2F202243940). [S2CID](/source/S2CID_(identifier)) [244398875](https://api.semanticscholar.org/CorpusID:244398875). [Gaia DR3 record for this source](https://vizier.cds.unistra.fr/viz-bin/VizieR-4?-source=+I%2F355&-from=nav&-nav=cat%3AI%2F355%26tab%3A%7BI%2F355%2Fgaiadr3%7D%26key%3Asource%3D1355%2Fgaiadr3%26HTTPPRM%3A%26-out.add%3D.%26Source%3D%3D%3D5664814198431308288%26-go+%25%23Sesame%23%25%26) at [VizieR](/source/VizieR).

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1. ^ [***a***](#cite_ref-carmenes_4-0) [***b***](#cite_ref-carmenes_4-1) [***c***](#cite_ref-carmenes_4-2) Passegger, V. M.; Reiners, Ansgar; 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](/source/ArXiv_(identifier)):[1802.02946](https://arxiv.org/abs/1802.02946). [Bibcode](/source/Bibcode_(identifier)):[2018A&A...615A...6P](https://ui.adsabs.harvard.edu/abs/2018A&A...615A...6P). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201732312](https://doi.org/10.1051%2F0004-6361%2F201732312). [S2CID](/source/S2CID_(identifier)) [55639432](https://api.semanticscholar.org/CorpusID:55639432).

1. **[^](#cite_ref-nstars_5-0)** 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](/source/ArXiv_(identifier)):[astro-ph/0603770](https://arxiv.org/abs/astro-ph/0603770). [Bibcode](/source/Bibcode_(identifier)):[2006AJ....132..161G](https://ui.adsabs.harvard.edu/abs/2006AJ....132..161G). [doi](/source/Doi_(identifier)):[10.1086/504637](https://doi.org/10.1086%2F504637). [S2CID](/source/S2CID_(identifier)) [119476992](https://api.semanticscholar.org/CorpusID:119476992).

1. **[^](#cite_ref-houdebine_6-0)** 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"](https://doi.org/10.3847%2F0004-637X%2F822%2F2%2F97). *The Astrophysical Journal*. **822** (2): 97. [arXiv](/source/ArXiv_(identifier)):[1604.07920](https://arxiv.org/abs/1604.07920). [Bibcode](/source/Bibcode_(identifier)):[2016ApJ...822...97H](https://ui.adsabs.harvard.edu/abs/2016ApJ...822...97H). [doi](/source/Doi_(identifier)):[10.3847/0004-637X/822/2/97](https://doi.org/10.3847%2F0004-637X%2F822%2F2%2F97). [S2CID](/source/S2CID_(identifier)) [119118088](https://api.semanticscholar.org/CorpusID:119118088).

1. ^ [***a***](#cite_ref-Weisserman2026_7-0) [***b***](#cite_ref-Weisserman2026_7-1) [***c***](#cite_ref-Weisserman2026_7-2) [***d***](#cite_ref-Weisserman2026_7-3) [***e***](#cite_ref-Weisserman2026_7-4) [***f***](#cite_ref-Weisserman2026_7-5) Weisserman, Drew; Gromek, Nicole; Cloutier, Ryan; Bali, Komal; Cadieux, Charles; Plotnykov, Mykhaylo; L'Heureux, Alexandrine; Srivastava, Avidaan; Carmona, Andres (2026-04-08). "Super-Earth masses and stellar abundances from NIRPS reveal tentative evidence for water-rich formation around M dwarfs". *Astronomy & Astrophysics*. [arXiv](/source/ArXiv_(identifier)):[2604.07447](https://arxiv.org/abs/2604.07447).

1. **[^](#cite_ref-morales_8-0)** 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](/source/ArXiv_(identifier)):[0711.3523](https://arxiv.org/abs/0711.3523). [Bibcode](/source/Bibcode_(identifier)):[2008A&A...478..507M](https://ui.adsabs.harvard.edu/abs/2008A&A...478..507M). [doi](/source/Doi_(identifier)):[10.1051/0004-6361:20078324](https://doi.org/10.1051%2F0004-6361%3A20078324). [S2CID](/source/S2CID_(identifier)) [16238033](https://api.semanticscholar.org/CorpusID:16238033).

1. **[^](#cite_ref-9)** Suárez Mascareño, A.; Rebolo, R.; González Hernández, J. I.; Esposito, M. (2015). ["Rotation periods of late-type dwarf stars from time series high-resolution spectroscopy of chromospheric indicators"](https://doi.org/10.1093%2Fmnras%2Fstv1441). *Monthly Notices of the Royal Astronomical Society*. **452** (3): 2745–2756. [arXiv](/source/ArXiv_(identifier)):[1506.08039](https://arxiv.org/abs/1506.08039). [Bibcode](/source/Bibcode_(identifier)):[2015MNRAS.452.2745S](https://ui.adsabs.harvard.edu/abs/2015MNRAS.452.2745S). [doi](/source/Doi_(identifier)):[10.1093/mnras/stv1441](https://doi.org/10.1093%2Fmnras%2Fstv1441).

1. **[^](#cite_ref-10)** Modirrousta-Galian, D.; Stelzer, B.; Magaudda, E.; Maldonado, J.; Güdel, M.; Sanz-Forcada, J.; Edwards, B.; Micela, G. (2020). "A Super-Earth Orbiting an Extremely Inactive Host Star". *Astronomy & Astrophysics*. **A113**: 641. [arXiv](/source/ArXiv_(identifier)):[2007.10262](https://arxiv.org/abs/2007.10262). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/202038280](https://doi.org/10.1051%2F0004-6361%2F202038280). [S2CID](/source/S2CID_(identifier)) [220647396](https://api.semanticscholar.org/CorpusID:220647396).

1. ^ [***a***](#cite_ref-:0_11-0) [***b***](#cite_ref-:0_11-1) [***c***](#cite_ref-:0_11-2) Reddy, Francis; Center, NASA’s Goddard Space Flight (2019-07-31). ["TESS Discovers Habitable Zone Planet in GJ 357 System"](https://scitechdaily.com/tess-discovers-habitable-zone-planet-in-gj-357-system/). *SciTechDaily*. [Archived](https://web.archive.org/web/20190801162521/https://scitechdaily.com/tess-discovers-habitable-zone-planet-in-gj-357-system/) from the original on 2019-08-01. Retrieved 2019-08-01.

1. **[^](#cite_ref-12)** ["The Extrasolar Planet Encyclopaedia — Gj 357 b"](https://exoplanet.eu/catalog/gj_357_b--7109/). *[Extrasolar Planets Encyclopaedia](/source/Extrasolar_Planets_Encyclopaedia)*. 1995. [Archived](https://web.archive.org/web/20231107150843/https://exoplanet.eu/catalog/gj_357_b--7109/) from the original on 2023-11-07. Retrieved 2019-08-01.

1. **[^](#cite_ref-13)** Falconer, Rebecca, *[Newly uncovered super-Earth 31 light-years away may be habitable](https://www.axios.com/super-earth-31-light-years-away-may-support-life-d1d0298d-3c82-4f99-a4af-22774fc1ed70.html) [Archived](https://web.archive.org/web/20191218061126/https://www.axios.com/super-earth-31-light-years-away-may-support-life-d1d0298d-3c82-4f99-a4af-22774fc1ed70.html) 2019-12-18 at the [Wayback Machine](/source/Wayback_Machine)*, Axios, August 1, 2019

1. **[^](#cite_ref-14)** ["Potentially habitable 'super-Earth' discovered just 31 light-years away"](https://www.nbcnews.com/mach/science/potentially-habitable-super-earth-discovered-just-31-light-years-away-ncna1037491). *NBC News*. 31 July 2019. [Archived](https://web.archive.org/web/20190731230808/https://www.nbcnews.com/mach/science/potentially-habitable-super-earth-discovered-just-31-light-years-away-ncna1037491) from the original on 2019-07-31. Retrieved 2019-08-01.

1. **[^](#cite_ref-15)** Garner, Rob (2019-07-30). ["NASA's TESS Helps Find Intriguing New World"](https://www.nasa.gov/feature/goddard/2019/confirmation-of-toasty-tess-planet-leads-to-surprising-find-of-promising-world). *NASA*. [Archived](https://web.archive.org/web/20190801045621/https://www.nasa.gov/feature/goddard/2019/confirmation-of-toasty-tess-planet-leads-to-surprising-find-of-promising-world/) from the original on 2019-08-01. Retrieved 2019-08-01.

1. **[^](#cite_ref-16)** Taylor, Jake; Radica, Michael; Chatterjee, Richard D.; Hammond, Mark; Meier, Tobias; Aigrain, Suzanne; MacDonald, Ryan J.; Albert, Loic; Benneke, Björn; Coulombe, Louis-Philippe; Cowan, Nicolas B.; Dang, Lisa; Doyon, René; Flagg, Laura; Johnstone, Doug; Kaltenegger, Lisa; Lafrenière, David; Pelletier, Stefan; Piaulet-Ghorayeb, Caroline; Rowe, Jason F.; Roy, Pierre-Alexis (2025). ["JWST NIRISS Transmission Spectroscopy of the Super-Earth GJ 357b, a Favourable Target for Atmospheric Retention"](https://doi.org/10.1093%2Fmnras%2Fstaf894). *Monthly Notices of the Royal Astronomical Society*. **540** (4): 3677. [arXiv](/source/ArXiv_(identifier)):[2505.24462](https://arxiv.org/abs/2505.24462). [Bibcode](/source/Bibcode_(identifier)):[2025MNRAS.540.3677T](https://ui.adsabs.harvard.edu/abs/2025MNRAS.540.3677T). [doi](/source/Doi_(identifier)):[10.1093/mnras/staf894](https://doi.org/10.1093%2Fmnras%2Fstaf894).

1. **[^](#cite_ref-Redai2025_17-0)** Redai, Jea Adams; Wogan, Nicholas; Wallack, Nicole L.; Alam, Munazza K.; Aguichine, Artyom; Wolfgang, Angie; Wakeford, Hannah R.; Teske, Johanna; Scarsdale, Nicholas (2025-07-09). ["JWST COMPASS: A NIRSpec G395H Transmission Spectrum of the Super-Earth GJ 357 b"](https://doi.org/10.3847%2F1538-3881%2Fadee92). *The Astronomical Journal*. **170** (4): 219. [arXiv](/source/ArXiv_(identifier)):[2507.07165](https://arxiv.org/abs/2507.07165). [Bibcode](/source/Bibcode_(identifier)):[2025AJ....170..219A](https://ui.adsabs.harvard.edu/abs/2025AJ....170..219A). [doi](/source/Doi_(identifier)):[10.3847/1538-3881/adee92](https://doi.org/10.3847%2F1538-3881%2Fadee92).

1. **[^](#cite_ref-Luque2019_18-0)** Luque, R.; Pallé, E.; et al. (August 2019). "Planetary system around the nearby M dwarf GJ 357 including a transiting, hot, Earth-sized planet optimal for atmospheric characterization". *[Astronomy & Astrophysics](/source/Astronomy_%26_Astrophysics)*. **628**: A39. [arXiv](/source/ArXiv_(identifier)):[1904.12818](https://arxiv.org/abs/1904.12818). [Bibcode](/source/Bibcode_(identifier)):[2019A&A...628A..39L](https://ui.adsabs.harvard.edu/abs/2019A&A...628A..39L). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201935801](https://doi.org/10.1051%2F0004-6361%2F201935801). [S2CID](/source/S2CID_(identifier)) [139102184](https://api.semanticscholar.org/CorpusID:139102184).

v t e Constellation of Hydra List of stars in Hydra Hydra in Chinese astronomy Stars Bayer α (Alphard) β γ (Naga) δ ε (Ashlesha) ζ η θ ι (Ukdah) κ λ μ ν ξ ο π ρ σ (Minchir) τ1 τ2 υ1 (Zhang) υ2 φ1 φ2 φ3 χ1 χ2 ψ ω b1 b3 C F Flamsteed 1 2 3 6 (a) 9 10 12 (D) 14 15 17 19 20 21 23 24 25 26 27 (P) 28 29 33 (A) 34 37 44 47 48 50 51 (k) 52 (l) 54 (m) 55 56 57 58 (Solitaire) 59 60 10 Crt 17 Crt 20 Crt 2 Sex Variable R U V W TW EX HS KU LQ V361 V419 V421 V478 V484 HR 3378 3538 3749 (G) 3750 3858 (I) 3862 3919 3923 (Felis) 4162 4328 4339 (β Ant) 4445 5265 HD 72659 74156 82943 86226 86264 90156 (γ Ant) Other 2MASS 1114−2618 ESO 439-26 Gliese 328 Gliese 357 Gliese 433 Gliese 453 GJ 3634 HAT-P-30 HE 1256−2738 HE 1327−2326 LHS 2065 LHS 3003 LTT 3780 SDSS J090745.0+024507 WASP-25 WASP-36 WASP-84 WASP-166 (Filetdor) WISE 0855−0714 WISEA J1141−3326 Exoplanets Gliese 357 d HD 72659 b HD 74156 b c HD 82943 b c HD 86226 b HD 86264 b TW Hydrae b (unconfirmed) WASP-193b Star clusters Messier 48 Messier 68 NGC 5694 Price-Whelan 1 Nebulae Abell 33 Abell 35 NGC 3242 Southern Owl Nebula Galaxies Messier 83 NGC 2617 2642 2697 2708 2758 2835 2848 2865 2890 2935 2936 2937 2960 2962 2986 2992 3030 3052 3054 3081 3109 3124 3200 3285 3285B 3290 3305 3307 3308 3309 3311 3312 3313 3314 3315 3316 3336 3369 3383 3393 3402 3463 3464 3585 3621 3673 3717 3904 3923 3936 4980 4993 5042 5061 5078 5085 5101 5135 5260 5264 5495 5626 Other 3C 196.1 AM 1316−241 Arp 7 CTQ 327 ESO 510-G13 GAMA202627 GLEAM J0917−0012 Hydra A IC 535 MRC 1138−262 Peekaboo Galaxy PKS 1151−348 RX J0911.4+0551 SDSS J0841+0101 TN J0924−2201 Tololo 1247−232 ZwCl 1693 BCG Galaxy clusters Abell 754 Abell 3411 Abell 3412 Bullet Group Hickson 40 Astronomical events GW170817 Category

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Adapted from the Wikipedia article [Gliese 357](https://en.wikipedia.org/wiki/Gliese_357) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Gliese_357?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.