51 Andromedae

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51 Andromedae
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension 01h 37m 59.56s[1]
Declination +48° 37′ 41.6″[1]
Apparent magnitude (V) 3.57[2]
Spectral type K3-III[3]
U−B color index +1.44[2]
B−V color index +1.28[2]
Radial velocity (Rv) 18.41[4] km/s
Proper motion (μ) RA: 61.95 ± 0.17[1] mas/yr
Dec.: -112.15 ± 0.17[1] mas/yr
Parallax (π) 18.41 ± 0.18[1] mas
Distance 177 ± 2 ly
(54.3 ± 0.5 pc)
Absolute magnitude (MV) −0.04[5]
Mass 2.3[6] M
Radius 21.5 ± 0.9[7] R
Metallicity [Fe/H] 0.00[5] dex
Other designations
υ Per, HD 9927, BD+47° 467, HIP 7607, HR 464, SAO 37375.
Database references

51 Andromedae (abbreviated 51 And) is the 5th brighest (4th magnitude) star in the constellation Andromeda. 51 Andromedae is the Flamsteed designation. It is occasionally called by the proper name Nembus[8][9] in Bayer's Uranometria (1603)[10] and Bode's star atlas Uranographia (1801).[11]

Ptolemy included this star in Andromeda in the Almagest, but it was moved into Perseus by Johann Bayer, who designated it Upsilon Persei (υ Per). Flamsteed moved it back, and the International Astronomical Union made Flamsteed's 51 Andromedae its official designation in 1930.[12][13][14]

In Chinese, 天大將軍 (Tiān Dà Jiāng Jūn), meaning Heaven's Great General, refers to an asterism consisting of 51 Andromedae, γ Andromedae, φ Persei, 49 Andromedae, χ Andromedae, υ Andromedae, τ Andromedae, 56 Andromedae, β Trianguli, γ Trianguli and δ Trianguli.[15] Consequently, 51 Andromedae itself is known as 天大將軍三 (Tiān Dà Jiāng Jūn sān, English: the Third Star of Heaven's Great General.)[16]

51 Andromedae is an orange K-type giant with an apparent magnitude of +3.59. It is approximately 177 light years from the Earth.[1]


  1. ^ a b c d e f van Leeuwen, F. (2007). "HIP 7607". Hipparcos, the New Reduction. Retrieved 2010-04-02. 
  2. ^ a b c 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. 
  3. ^ Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars". Astrophysical Journal Supplement Series (ISSN 0067-0049). 71: 245. Bibcode:1989ApJS...71..245K. doi:10.1086/191373. 
  4. ^ Maldonado, J.; Villaver, E.; Eiroa, C. (2013). "The metallicity signature of evolved stars with planets". Astronomy & Astrophysics. 554: A84. Bibcode:2013A&A...554A..84M. arXiv:1303.3418Freely accessible. doi:10.1051/0004-6361/201321082. 
  5. ^ a b Cardini, D. (January 2005), "Mg II chromospheric radiative loss rates in cool active and quiet stars", Astronomy and Astrophysics, 430: 303−311, Bibcode:2005A&A...430..303C, arXiv:astro-ph/0409683Freely accessible, doi:10.1051/0004-6361:20041440. 
  6. ^ Gondoin, P. (December 1999), "Evolution of X-ray activity and rotation on G-K giants", Astronomy and Astrophysics, 352: 217–227, Bibcode:1999A&A...352..217G 
  7. ^ Nordgren, Tyler E.; et al. (December 1999), "Stellar Angular Diameters of Late-Type Giants and Supergiants Measured with the Navy Prototype Optical Interferometer", The Astronomical Journal, 118 (6): 3032–3038, Bibcode:1999AJ....118.3032N, doi:10.1086/301114 
  8. ^ Allen, R. H. (1899). Star-names and Their Meanings. New York: G. E. Stechart. , p.334.
  9. ^ p. 5, Astronomers' Stars, Patrick Moore, London, Routledge, 1987.
  10. ^ Scans of the plates of Uranometria by J. Bayer, 1603 Archived August 7, 2008, at the Wayback Machine. @Linda Hall Library
  11. ^ Scan of the plates of Uranographia by J.E. Bode, 1801 @Ian Ridpath's Star Tales
  12. ^ "Ephemerides – Report of Commissions", Transactions of the International Astronomical Union, 4: 20, 1932 
  13. ^ Allen, R. H. (1899). Star-names and Their Meanings. New York: G. E. Stechart. , p.34.
  14. ^ Wagman, Morton (2003) Lost Stars p.240, McDonald and Woodward, Blacksburg, Virginia. ISBN 0-939923-78-5.
  15. ^ (in Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.
  16. ^ (in Chinese) http://zh.wikipedia.org/zh-tw/%E5%A4%A9%E5%A4%A7%E5%B0%86%E5%86%9B%E4%B8%89

External links[edit]