37 Tauri


37 Tauri
Observation data
Epoch J2000      Equinox J2000
Constellation Taurus
Right ascension 04h 04m 41.71484s[1]
Declination +22° 04′ 54.9243″[1]
Apparent magnitude (V) 4.36[2]
Spectral type K0 III-IIIb[3]
U−B color index 0.95[4]
B−V color index 1.07[5]
R−I color index 0.53[4]
Radial velocity (Rv)+9.52±0.11[6] km/s
Proper motion (μ) RA: +90.53[1] mas/yr
Dec.: −59.47[1] mas/yr
Parallax (π)17.43 ± 0.21[1] mas
Distance187 ± 2 ly
(57.4 ± 0.7 pc)
Absolute magnitude (MV)0.57[2]
Mass1.99[5] M
Radius10.15±0.69[7] R
Luminosity60±6[7] L
Surface gravity (log g)2.77[7] cgs
Temperature4,732±26[5] K
Metallicity [Fe/H]+0.01[7] dex
Rotational velocity (v sin i)2.8[6] km/s
Age1.39[5] Gyr
Other designations
37 Tau, BD+21° 585, FK5 1112, HD 25604, HIP 19038, HR 1256, SAO 76430, WDS J04047+2205A[8]
Database references

37 Tauri is a single,[9] orange-hued star in the zodiac constellation of Taurus. It can be seen with the naked eye, having an apparent visual magnitude of 4.36.[2] A magnitude 10.01 visual companion has an angular separation of 134.30 on a position angle of 138.6°, as of 2003.[10] Based on an annual parallax shift of 17.43±0.21 mas,[1] 37 Tauri is about 187 light years away. It is moving further from the Sun with a heliocentric radial velocity of 9.5 km/s.[6]

This is an evolved K-type giant star with a stellar classification of K0 III-IIIb.[3] At the age of 1.39[5] billion years, it has become a red clump giant, indicating that it is generating energy through helium fusion at its core.[11] The star has around double the mass of the Sun and has expanded to 10[7] times the Sun's radius. It is radiating roughly 60[7] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,732 K.[5]

Chinese astronomy

In Chinese astronomy, 37 Tauri is called 月, Pinyin: Yuè, meaning Moon, because this star is marking itself and stand alone in Moon asterism, Hairy Head mansion (see : Chinese constellation).[12]


  1. ^ a b c d e f 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, S2CID 18759600.
  2. ^ a b c Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
  3. ^ a b Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.
  4. ^ a b Ducati, J. R. (2002), "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system", CDS/ADC Collection of Electronic Catalogues, 2237, Bibcode:2002yCat.2237....0D.
  5. ^ a b c d e f Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal, 150 (3), 88, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88, S2CID 118505114.
  6. ^ a b c Massarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 Hipparcos Giants and the Role of Binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209.
  7. ^ a b c d e f Piau, L.; et al. (2010), "Surface convection and red-giants radii measurements", Astronomy and Astrophysics, 526: 12, arXiv:1010.3649, Bibcode:2011A&A...526A.100P, doi:10.1051/0004-6361/201014442, S2CID 118533297, A100.
  8. ^ "37 Tau". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-03-22.
  9. ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
  10. ^ Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466, Bibcode:2001AJ....122.3466M, doi:10.1086/323920
  11. ^ Puzeras, E.; et al. (October 2010), "High-resolution spectroscopic study of red clump stars in the Galaxy: iron-group elements", Monthly Notices of the Royal Astronomical Society, 408 (2): 1225–1232, arXiv:1006.3857, Bibcode:2010MNRAS.408.1225P, doi:10.1111/j.1365-2966.2010.17195.x, S2CID 44228180.
  12. ^ Ian Ridpath's Star Tales - Taurus the Bull