Stein 2051

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Star in the constellation Camelopardalis

title: "Stein 2051" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["camelopardalis", "binary-stars", "m-type-main-sequence-stars", "white-dwarfs", "gliese-and-gj-objects", "wise-objects", "hipparcos-objects", "population-i-stars"] description: "Star in the constellation Camelopardalis" topic_path: "science/astronomy" source: "https://en.wikipedia.org/wiki/Stein_2051" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Star in the constellation Camelopardalis ::

| name=Stein 2051}} | image = [[File:Potw1724b.jpg|350px]] | caption = Annotated Hubble Space Telescope image of the Stein 2051 components and a background star ("source") used to measure the bending of starlight | credit = NASA, ESA, and K. Sahu (STScI) | epoch = J2000 | constell = Camelopardalis | component1 = Stein 2051 A | ra1 = | dec1 = | appmag_v1 = 10.98 | component2 = Stein 2051 B | ra2 = | dec2 = | appmag_v2 = 12.43 | component1 = Stein 2051 A | type = main sequence | class = M4.0Ve | b-v = +1.65 | u-b = +1.21 | component2 = Stein 2051 B | type2 = white dwarf | class2 = DC5 | b-v2 = +0.31 | u-b2 = -0.53 | component1 = Stein 2051 A | radial_v = +29 | prop_mo_ra = +1,300.365 | prop_mo_dec = −2,046.106 | pm_footnote = | parallax = 181.2438 | p_error = 0.0499 | parallax_footnote = | absmag_v = +12.36 | component2 = Stein 2051 B | radial_v2 = +2.0 | prop_mo_ra2 = | prop_mo_dec2 = | parallax2 = 181.2730 | p_error2 = 0.0203 | parallax_footnote2 = | absmag_v2 = +13.71 | source =
| component1=Stein 2051 A | mass = 0.252 | radius = 0.292 | luminosity = 0.0081 | luminosity_bolometric =
| luminosity_visual =
| gravity = 4.80 | temperature = 3277 | metal_fe = 0.26 | rotation =
| rotational_velocity = 5.2 | age_gyr = 1.9 - 3.6 | component2=Stein 2051 B | mass2 = 0.675 | radius2 = 0.0114 | gravity2 = 8.153 | temperature2 = 7122 | luminosity2 = 0.00003 | age_gyr2 = 1.9±0.4 (cooling age) |names=Stein 2051, G 175-34, HIP 21088, WDS J04312+5858AB, GJ 169.1, PLX 986.01 |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 |Simbad=GJ+169.1+A |sn=A |Simbad3=GJ+169.1+B |sn3=B |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

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.

Stein 2051 is the nearest (red dwarf + white dwarf) separate binary system (40 Eridani BC is located closer at 16.26 light-years, 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.

Properties

The brighter of these two stars is A (a red dwarf), but the more massive is component B (a white dwarf).

In 2017, Stein 2051 B was observed passing in front of a more distant star. The bending of starlight by the gravitational field of the nearer star allowed its mass to be directly measured. The estimated mass of Stein 2051 B is , which fits the expected range of a white dwarf with a carbon-oxygen core.{{cite journal | title=Relativistic deflection of background starlight measures the mass of a nearby white dwarf star | display-authors=1 | last1=Sahu | first1=Kailash C. | last2=Anderson | first2=Jay | last3=Casertano | first3=Stefano | last4=Bond | first4=Howard E. | last5=Bergeron | first5=Pierre | last6=Nelan | first6=Edmund P. | last7=Pueyo | first7=Laurent | last8=Brown | first8=Thomas M. | last9=Bellini | first9=Andrea | last10=Levay | first10=Zoltan G. | last11=Sokol | first11=Joshua | last12=Dominik | first12=Martin | last13=Calamida | first13=Annalisa | last14=Kains | first14=Noé | last15=Livio | first15=Mario | journal=Science | volume=356 | issue=6342 | pages=1046–1050 | date=June 2017 | arxiv=1706.02037 | doi=10.1126/science.aal2879 | pmid=28592430 | bibcode=2017Sci...356.1046S | s2cid=206654918 }}

Notes

References

References

  1. {{cite constellation. Stein 2051
  2. (2012). "VizieR Online Data Catalog: UCAC4 Catalogue (Zacharias+, 2012)". Vizier Online Data Catalog.
  3. (2016). "The 25 parsec local white dwarf population". Monthly Notices of the Royal Astronomical Society.
  4. (2013). "A Spectroscopic Catalog of the Brightest (J < 9) M Dwarfs in the Northern Sky". The Astronomical Journal.
  5. (1966). "UBV Photometry of the Lowell Proper Motion Object G175-34". Publications of the Astronomical Society of the Pacific.
  6. (1984). "Spectrophotometry of the white dwarfs". The Astrophysical Journal.
  7. (2018). "SPIRou Input Catalogue: Global properties of 440 M dwarfs observed with ESPaDOnS at CFHT". Monthly Notices of the Royal Astronomical Society.
  8. {{cite Gaia DR3. 470826482637310080
  9. (2019). "The Mass-Activity Relationships in M and K Dwarfs. I. Stellar Parameters of Our Sample of M and K Dwarfs". The Astronomical Journal.
  10. (2002). "Wide Binary Systems and the Nature of High-Velocity White Dwarfs". The Astronomical Journal.
  11. {{cite Gaia DR3. 470826482637310848
  12. (2015). "Physical Properties of the Current Census of Northern White Dwarfs within 40 pc of the Sun". The Astrophysical Journal Supplement Series.
  13. (2020). "The CARMENES search for exoplanets around M dwarfs". Astronomy & Astrophysics.
  14. (2020). "Understanding the physical properties of young M dwarfs: NIR spectroscopic studies". Monthly Notices of the Royal Astronomical Society.
  15. Perryman. (1997). "HIP 21088". The Hipparcos and Tycho Catalogues.
  16. (1991). "Gl 169.1". Preliminary Version of the Third Catalogue of Nearby Stars.
  17. "NAME Stein 2051 A".
  18. "NAME Stein 2051 B".
  19. (1995). "GCTP 986.01". The General Catalogue of Trigonometric Stellar Parallaxes.
  20. Perryman. (1997). "HIP 19849". The Hipparcos and Tycho Catalogues.

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camelopardalisbinary-starsm-type-main-sequence-starswhite-dwarfsgliese-and-gj-objectswise-objectshipparcos-objectspopulation-i-stars