Stein 2051

{{Short description|Star in the constellation Camelopardalis}}

{{Sky|04|31|11.52059|+|58|58|37.4806|17.993}}

{{Starbox begin

| name=Stein 2051}}

{{Starbox image

| image = 350px

| caption = Image of Stein 2051 B and a background star taken by the Hubble Space Telescope.{{cite web|title=Einstein revisited|url=https://www.spacetelescope.org/images/potw1724a/|website=www.spacetelescope.org|access-date=12 June 2017}}

| credit = NASA, ESA, and K. Sahu (STScI)

}}

{{Starbox observe 2s

| epoch = J2000

| constell = Camelopardalis

| component1 = Stein 2051 A

| ra1 = {{RA|04|31|11.5181}}{{cite simbad|title=NAME Stein 2051 A|access-date=26 December 2016}}

| dec1 = {{DEC|+58|58|37.461}}

| appmag_v1 = 10.977

| component2 = Stein 2051 B

| ra2 = {{RA|04|31|12.570}}{{cite simbad|title=NAME Stein 2051 B|access-date=20 December 2016}}

| dec2 = {{DEC|+58|58|41.15}}

| appmag_v2 = 11.19

}}

{{Starbox character

| component1 = Stein 2051 A

| class = M4.0Ve

| b-v = +1.65{{cite journal|author1=Hardie, R. H.|title=UBV Photometry of the Lowell Proper Motion Object G175-34|journal=Publications of the Astronomical Society of the Pacific|volume=78|number=462|page=171|date=1966|bibcode=1966PASP...78..171H|doi=10.1086/128321|doi-access=free}}

| u-b = +1.21

| component2 = Stein 2051 B

| class2 = DC5

| b-v2 = +0.31

| u-b2 = -0.53

}}

{{Starbox astrometry

| component1 = Stein 2051 A

| radial_v = 29

| prop_mo_ra = 1300.365

| prop_mo_dec = -2046.106

| pm_footnote =

| parallax = 181.2438

| p_error = 0.0499

| parallax_footnote = {{cite Gaia EDR3|470826482637310080}}

| component2 = Stein 2051 B

| radial_v2 = 2.0

| prop_mo_ra2 = {{val|1334.780|0.021}}

| prop_mo_dec2 = {{val|-1947.638|0.019}}

| parallax2 = 181.2730

| p_error2 = 0.0203

| parallax_footnote2 = {{cite Gaia EDR3|470826482637310848}}

}}

{{Starbox detail

| source = {{citation|arxiv=2008.01186|year=2020|title=The CARMENES search for exoplanets around M dwarfs|doi=10.1051/0004-6361/202038787 |last1=Passegger |first1=V. M. |last2=Bello-García |first2=A. |last3=Ordieres-Meré |first3=J. |last4=Caballero |first4=J. A. |last5=Schweitzer |first5=A. |last6=González-Marcos |first6=A. |last7=Ribas |first7=I. |last8=Reiners |first8=A. |last9=Quirrenbach |first9=A. |last10=Amado |first10=P. J. |last11=Azzaro |first11=M. |last12=Bauer |first12=F. F. |last13=Béjar |first13=V. J. S. |last14=Cortés-Contreras |first14=M. |last15=Dreizler |first15=S. |last16=Hatzes |first16=A. P. |last17=Henning |first17=Th. |last18=Jeffers |first18=S. V. |last19=Kaminski |first19=A. |last20=Kürster |first20=M. |last21=Lafarga |first21=M. |last22=Marfil |first22=E. |last23=Montes |first23=D. |last24=Morales |first24=J. C. |last25=Nagel |first25=E. |last26=Sarro |first26=L. M. |last27=Solano |first27=E. |last28=Tabernero |first28=H. M. |last29=Zechmeister |first29=M. |journal=Astronomy & Astrophysics |volume=642 |pages=A22 |bibcode=2020A&A...642A..22P }}

| component1=Stein 2051 A

| mass = 0.252{{±|0.013}}{{citation|arxiv=2002.05762|year=2020|title=Understanding the physical properties of young M dwarfs: NIR spectroscopic studies|doi=10.1093/mnras/staa427 |last1=Ghosh |first1=Samrat |last2=Ghosh |first2=Supriyo |last3=Das |first3=Ramkrishna |last4=Mondal |first4=Soumen |last5=Khata |first5=Dhrimadri |journal=Monthly Notices of the Royal Astronomical Society |volume=493 |issue=3 |pages=4533–4550 |doi-access=free |bibcode=2020MNRAS.493.4533K }}

| radius = 0.292{{±|0.031}}

| luminosity = 0.0081

| luminosity_bolometric =

| luminosity_visual =

| gravity = 4.80{{±|0.13|0.10}}

| temperature = 3277{{±|42|75}}

| metal_fe = 0.26{{±|0.06|0.22}}

| rotation =

| rotational_velocity = 5.2{{±|1.7|2.7}}

| age_gyr =

| component2=Stein 2051 B

| mass2 = 0.675{{±|0.051}}

| radius2 = 0.0114{{±|0.0004}}

| temperature2 = 7122{{±|181}}

}}

{{Starbox catalog

|names=Stein 2051, G 175-34, HIP 21088,{{cite web|url=http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-source=I/239/hip_main&HIP=21088|title=HIP 21088|work=The Hipparcos and Tycho Catalogues|author=Perryman|year=1997|display-authors=etal|access-date=2014-11-23}} WDS J04312+5858AB, GJ 169.1,{{cite web|url=http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-source=V/70A&Name=Gl%20169.1|title=Gl 169.1|work=Preliminary Version of the Third Catalogue of Nearby Stars|author1=Gliese, W. |author2=Jahreiß, H. |name-list-style=amp |year=1991|access-date=2014-11-23}} PLX 986.01{{r|van Altena1995}}

|component1=Stein 2051 A

|names1=LHS 26, NLTT 13373, TYC 3744-412-1, 2MASS J04311147+585837, WISE J043113.20+585816.7

|component2=Stein 2051 B

|names2= EGGR 180, LHS 27, NLTT 13375, TYC 3744-2062-1, 2MASS J04311201+5858476, WD 0426+58, WD2 0426+585, WD3 0426+588

}}

{{Starbox reference

|Simbad=HIP+21088

|sn=The system

|Simbad2=GJ+169.1+A

|sn2=A

|Simbad3=GJ+169.1+B

|sn3=B

}}

{{Starbox image

|image={{Location map|100x100|AlternativeMap=Camelopardalis_constellation_map.svg

|alt=Stein 2051 is located in the constellation Camelopardalis

|caption=Location of Stein 2051 in the constellation Camelopardalis|border=infobox|mark=Red_pog.png|width=350

|label=Stein 2051

|lat=18.3

|long=67.9

}}|caption=

}}

{{Starbox end}}

Stein 2051 (Gliese 169.1, G 175-034, LHS 26/27) is a nearby binary star system, containing a red dwarf (component A) and a degenerate star (white dwarf) (component B), located in constellation Camelopardalis at about 18 ly from Earth.{{cite web|url=http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-source=I/238A/picat&GCTP=986.01|title=GCTP 986.01|work=The General Catalogue of Trigonometric Stellar Parallaxes |edition=Fourth |author1=Van Altena W. F. |author2=Lee J. T. |author3=Hoffleit E. D. |year=1995|access-date=2014-11-23}}

Stein 2051 is the nearest (red dwarf + white dwarf) separate binary system (40 Eridani BC is located closer at 16.26 light-years,{{cite web|url=http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-source=I/239/hip_main&HIP=19849|title=HIP 19849|work=The Hipparcos and Tycho Catalogues|author=Perryman|year=1997|display-authors=etal|access-date=2014-11-21}} but it is a part of a triple star system).

Stein 2051 B is the 6th nearest white dwarf after Sirius B, Procyon B, van Maanen's star, LP 145-141 and 40 Eridani B.