6 Geminorum

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6 Geminorum
Gemini constellation map.svg
Red circle.svg
Location of 6 Geminorum (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Gemini
Right ascension 06h 12m 19.09863s[1]
Declination +22° 54′ 30.6424″[1]
Apparent magnitude (V) 5.74 - 8.10[2]
Spectral type M1-2Ia-Iab[2]
U−B color index +1.93[3]
B−V color index +1.63[3]
Variable type LC[2]
Radial velocity (Rv)27.16 km/s
Proper motion (μ) RA: -0.40[1] mas/yr
Dec.: -3.12[1] mas/yr
Parallax (π)-0.52 ± 0.69 mas
Absolute magnitude (MV)-6.32[4]
Mass~20[5] M
Radius670[4] R
Diameter670[4] D
Luminosity86,000[6] L
Surface gravity (log g)0.0[4] cgs
Temperature3,789[7] K
Other designations
6 Gem, BU Gem, HR 2197, BD+22° 1220, HD 42543, HIP 29450, SAO 78098, GC 7896, TYC 1877-1719-1, 2MASS J06121911+2254305
Database references

6 Geminorum, also designated BU Geminorum (abbrev: BU Gem), is a red supergiant, located in the constellation Gemini. BU Geminorum is a semiregular variable star, found southwest of M 35, below WY Geminorum, with magnitudes +5.7 to +7.5 v over a period of 325 days. At its brightest the star is barely visible to the naked eye but visible with binoculars. It has been given the sub-classification of Lc "Irregular variable supergiants of late spectral types having amplitudes of about 1 mag. in V.O".[8]


  1. 1.0 1.1 1.2 1.3 van Leeuwen, F. (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. http://www.aanda.org/index.php?option=com_article&access=bibcode&Itemid=129&bibcode=2007A%2526A...474..653VFUL. Vizier catalog entry
  2. 2.0 2.1 2.2 Samus, N. N.Expression error: Unrecognized word "etal". (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S 1. Bibcode 2009yCat....102025S.
  3. 3.0 3.1 Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV data. Bibcode 1986EgUBV........0M. http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?1986EgUBV........0M&db_key=AST&nosetcookie=1.
  4. 4.0 4.1 4.2 Levesque, Emily M. (2005). "The Effective Temperature Scale of Galactic Red Supergiants: Cool, but Not As Cool As We Thought". The Astrophysical Journal 628 (2): 973–985. arXiv:astro-ph/0504337. Bibcode 2005ApJ...628..973L. doi:10.1086/430901.
  5. Lua error in Module:Citation/CS1 at line 379: attempt to call method 'match' (a nil value).
  6. Mauron, N; Josselin, E (2011). "The mass-loss rates of red supergiants and the de Jager prescription". Astronomy and Astrophysics 526: A156. arXiv:1010.5369. Bibcode 2011A&A...526A.156M. doi:10.1051/0004-6361/201013993.
  7. Mármol-Queraltó, E; Cardiel, N; Cenarro, A. J; Vazdekis, A; Gorgas, J; Pedraz, S; Peletier, R. F; Sánchez-Blázquez, P (2008). "A new stellar library in the region of the CO index at 2.3 μm. New index definition and empirical fitting functions". Astronomy and Astrophysics 489 (2): 885–909. arXiv:0806.0581. Bibcode 2008A&A...489..885M. doi:10.1051/0004-6361:200810044. http://eprints.ucm.es/28210/1/cardiel29libre.pdf.
  8. Variable Star Type Designations in VSX- Retrieved 2016-11-06

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