Gliese 357#Planetary system

{{Short description|Red dwarf with low starspot activity in the Hydra constellation}}

{{Starbox begin}}

{{Starbox image

| image = File:GJ 357 system.png

| caption = Artist concept of the Gliese 357 (GJ357) system.

| credit = Jack Madden

}}

{{Starbox observe

| epoch=J2000

| constell = Hydra{{cite constellation|GJ 357}}

| ra = {{RA|09|36|01.63722}}

| dec = {{DEC|-21|39|38.8776}}

| appmag_v = 10.906{{cite journal |bibcode=2010MNRAS.403.1949K |title=UBV(RI)_C JHK observations of Hipparcos-selected nearby stars |journal=Monthly Notices of the Royal Astronomical Society |volume=403 |issue=4 |pages=1949 |last1=Koen |first1=C. |last2=Kilkenny |first2=D. |last3=Van Wyk |first3=F. |last4=Marang |first4=F. |year=2010 |doi=10.1111/j.1365-2966.2009.16182.x |doi-access=free }}

}}

{{Starbox character

| type = main sequence

| class = M2.5V{{cite journal |bibcode=2006AJ....132..161G |title=Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc-The Southern Sample |journal=The Astronomical Journal |volume=132 |issue=1 |pages=161–170 |last1=Gray |first1=R. O. |last2=Corbally |first2=C. J. |last3=Garrison |first3=R. F. |last4=McFadden |first4=M. T. |last5=Bubar |first5=E. J. |last6=McGahee |first6=C. E. |last7=O'Donoghue |first7=A. A. |last8=Knox |first8=E. R. |year=2006 |arxiv=astro-ph/0603770 |doi=10.1086/504637 |s2cid=119476992 }}

}}

{{Starbox astrometry

| radial_v = {{val|-35.03|0.17}}

| prop_mo_ra = {{val|138.722|0.023}}

| prop_mo_dec = {{val|-990.342|0.020}}

| pm_footnote =

| parallax = 105.9789

| p_error = 0.0227

| parallax_footnote =

| absmag_v = +11.13

}}

{{Starbox detail

| mass = 0.362{{cite journal |bibcode=2018A&A...615A...6P |title=The CARMENES search for exoplanets around M dwarfs. Photospheric parameters of target stars from high-resolution spectroscopy |journal=Astronomy and Astrophysics |volume=615 |pages=A6 |last1=Passegger |first1=V. M. |last2=Reiners |first2=Ansgar |last3=Jeffers |first3=S. V. |last4=Wende-von Berg |first4=S. |last5=Schöfer |first5=P. |last6=Caballero |first6=J. A. |last7=Schweitzer |first7=A. |last8=Amado |first8=P. J. |last9=Béjar |first9=V. J. S. |last10=Cortés-Contreras |first10=M. |last11=Hatzes |first11=A. P. |last12=Kürster |first12=M. |last13=Montes |first13=D. |last14=Pedraz |first14=S. |last15=Quirrenbach |first15=A. |last16=Ribas |first16=I. |last17=Seifert |first17=W. |year=2018 |arxiv=1802.02946 |doi=10.1051/0004-6361/201732312 |s2cid=55639432 }}

| radius = 0.333{{cite journal |bibcode=2016ApJ...822...97H |title=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 |journal=The Astrophysical Journal |volume=822 |issue=2 |pages=97 |last1=Houdebine |first1=E. R. |last2=Mullan |first2=D. J. |last3=Paletou |first3=F. |last4=Gebran |first4=M. |last5=Bubar |first5=E. J. |last6=McGahee |first6=C. E. |last7=O'Donoghue |first7=A. A. |last8=Knox |first8=E. R. |year=2016 |arxiv=1604.07920 |doi=10.3847/0004-637X/822/2/97 |s2cid=119118088 |doi-access=free }}

| temperature = 3,488

| luminosity = 0.014{{cite journal |bibcode=2008A&A...478..507M |title=The effect of activity on stellar temperatures and radii |journal=Astronomy and Astrophysics |volume=478 |issue=2 |pages=507 |last1=Morales |first1=J. C. |last2=Ribas |first2=I. |last3=Jordi |first3=C. |last4=McFadden |first4=M. T. |last5=Bubar |first5=E. J. |last6=McGahee |first6=C. E. |last7=O'Donoghue |first7=A. A. |last8=Knox |first8=E. R. |year=2008 |arxiv=0711.3523 |doi=10.1051/0004-6361:20078324 |s2cid=16238033 }}

| gravity = 4.96

| rotational_velocity = 2.5

| metal_fe = {{val|-0.14}}

| rotation = {{val|74.3|1.7|ul=d}}{{citation |arxiv=1506.08039 |doi=10.1093/mnras/stv1441 |title=Rotation periods of late-type dwarf stars from time series high-resolution spectroscopy of chromospheric indicators |year=2015 |last1=Suárez Mascareño |first1=A. |last2=Rebolo |first2=R. |last3=González Hernández |first3=J. I. |last4=Esposito |first4=M. |journal=Monthly Notices of the Royal Astronomical Society |volume=452 |issue=3 |pages=2745–2756 |doi-access=free |bibcode=2015MNRAS.452.2745S }}

| age_myr =

}}

{{Starbox catalog

| names= {{odlist |HIP=47103 |2MASS=09360161-2139371 |TOI=562}}

}}

{{Starbox reference

| Simbad = HIP+47103

| NSTED = GJ-357

}}

{{Starbox end}}

GJ 357 (Gliese 357) is an M-type main sequence star with an unusually low star spot activity.{{citation|arxiv=2007.10262|title=A Super-Earth Orbiting an Extremely Inactive Host Star|year=2020|doi=10.1051/0004-6361/202038280|last1=Modirrousta-Galian|first1=D.|last2=Stelzer|first2=B.|last3=Magaudda|first3=E.|last4=Maldonado|first4=J.|last5=Güdel|first5=M.|last6=Sanz-Forcada|first6=J.|last7=Edwards|first7=B.|last8=Micela|first8=G.|journal=Astronomy & Astrophysics|volume=A113|page=641|s2cid=220647396}} It is located 31 light-years from the Solar System,{{Cite web|url=https://scitechdaily.com/tess-discovers-habitable-zone-planet-in-gj-357-system/|title=TESS Discovers Habitable Zone Planet in GJ 357 System|last1=Reddy|first1=Francis|last2=Center|first2=NASA’s Goddard Space Flight|date=2019-07-31|website=SciTechDaily|language=en-US|access-date=2019-08-01|archive-date=2019-08-01|archive-url=https://web.archive.org/web/20190801162521/https://scitechdaily.com/tess-discovers-habitable-zone-planet-in-gj-357-system/|url-status=live}} in the Hydra constellation.