Gliese 251

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Gliese 251
Observation data
Epoch J2000      Equinox J2000
Constellation Gemini
Right ascension  06h 54m 48.96009s[1]
Declination +33° 16′ 05.4393″[1]
Apparent magnitude (V) +10.11[2]
Spectral type M3.0Ve[3]
U−B color index +1.20[4]
B−V color index +1.60[4]
Radial velocity (Rv)22.91[5] km/s
Proper motion (μ) RA: -723.99[1] mas/yr
Dec.: -398.40[1] mas/yr
Parallax (π)179.01 ± 1.60[1] mas
Distance18.2 ± 0.2 ly
(5.59 ± 0.05 pc)
Absolute magnitude (MV)11.23[6]
Mass0.372 ± 0.002[7] M
Radius0.446[8] R
Surface gravity (log g)5.0[3] cgs
3245[7] K
Metallicity [Fe/H]-0.18[7] dex
Rotational velocity (v sin i)≤2.4[7] km/s
Other designations
Gliese 251, HD 265866, HIP 33226, LHS 1879, LTT 11941, Ross 578, Wolf 294[9]
Database references

Gliese 251, also known as HIP 33226 or HD 265866, is a star located about 18 light years away from the Solar System. Located in the constellation of Gemini, it is the nearest star in this constellation.[10] It is located near the boundary with Auriga, 49 arcminutes away from the bright star Theta Geminorum; due to its apparent magnitude of +9.89 it cannot be observed with the naked eye.[2] The closest star to Gliese 251 is QY Aurigae, which is located 3.5 light years away.[11]

Gliese 251 is a red dwarf with a spectral type of M3V[3] with an effective temperature of about 3300 K.[3] Its mass has been measured to be around 0.35 solar masses[7] and its radius is about 45% solar radii.[8] Its metallicity is less than that of the Sun, and is only 70% compared to that of the Sun. Observations at infrared wavelengths rule out the presence of a circumstellar disk around it.[12]


  1. ^ a b c d e van Leeuwen, F.; et al. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
  2. ^ a b Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H.
  3. ^ a b c d e Lépine, Sébastien (2013). "A Spectroscopic Catalog of the Brightest (J < 9) M Dwarfs in the Northern Sky". The Astronomical Journal. 145 (4). arXiv:1206.5991. Bibcode:2013AJ....145..102L. doi:10.1088/0004-6256/145/4/102.
  4. ^ a b Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Bibcode:1986EgUBV........0M.
  5. ^ Nidever, David L.; et al. (2013). "Radial Velocities for 889 Late-Type Stars". The Astrophysical Journal Supplement Series. 141 (2): 503–522. arXiv:astro-ph/0112477. Bibcode:2002ApJS..141..503N. doi:10.1086/340570.
  6. ^ "ARICNS 4C00526". ARICNS. Retrieved 8 February 2017.
  7. ^ a b c d e Jenkins, J. S.; Ramsey, L. W.; Jones, H. R. A.; Pavlenko, Y.; Gallardo, J.; Barnes, J. R.; Pinfield, D. J. (2009). "Rotational Velocities for M Dwarfs". The Astrophysical Journal. 704 (2): 975–988. arXiv:0908.4092. Bibcode:2009ApJ...704..975J. doi:10.1088/0004-637X/704/2/975.
  8. ^ a b Pasinetti Fracassini, L. E.; et al. (2001). "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics". Astronomy & Astrophysics. 367: 521–24. arXiv:astro-ph/0012289. Bibcode:2001A&A...367..521P. doi:10.1051/0004-6361:20000451.
  9. ^ "GJ 251". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 8 February 2017.
  10. ^ "Closest Stars". Retrieved 8 February 2017.
  11. ^ "Stars within 15 light-years of Wolf 294". The Internet Stellar Database. Retrieved 7 February 2017.
  12. ^ Beichman, C. A.; et al. (2006). "New Debris Disks around Nearby Main-Sequence Stars: Impact on the Direct Detection of Planets". The Astrophysical Journal. 652 (2): 1674–1693. arXiv:astro-ph/0611682. Bibcode:2006ApJ...652.1674B. doi:10.1086/508449.