41 Andromedae

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41 Andromedae
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension  01h 08m 00.84955s[1]
Declination +43° 56′ 31.5158″[1]
Apparent magnitude (V) 5.04[2]
Spectral type A2IIIvs[3] (kA2hA6mA6[4])
U−B color index +0.14[2]
B−V color index +0.11[2]
Radial velocity (Rv)+9.5±0.7[5] km/s
Proper motion (μ) RA: +161.612[1] mas/yr
Dec.: −59.843[1] mas/yr
Parallax (π)18.3680 ± 0.2627[1] mas
Distance178 ± 3 ly
(54.4 ± 0.8 pc)
Absolute magnitude (MV)1.19[6]
Mass2.27[7] M
Luminosity5.00[6] L
Surface gravity (log g)4.04[2] cgs
Temperature8,511[2] K
Rotational velocity (v sin i)84[8] km/s
Age450[7] Gyr
Other designations
41 And, BD+43° 234, HD 6658, HIP 5317, HR 324, SAO 36950[9]
Database references

41 Andromedae is a single[10] star in the northern constellation of Andromeda. 41 Andromedae is the Flamsteed designation. It is bright enough to be faintly visible to the naked eye, having an apparent visual magnitude of 5.04.[2] Based upon an annual parallax shift of 18.4 mas,[1] it is located 178 light years away. The star is moving further from the Earth with a heliocentric radial velocity of +10 km/s[5] and it has a relatively high rate of proper motion, traversing the celestial sphere at the rate of 0.171 per year.[11]

The stellar classification for this star is A2IIIvs,[3] matching an A-type giant star with narrow (sharp) absorption lines. Abt and Levy (1985) classed it as a kA2hA6mA6[4] star, which indicates the spectrum has the calcium K line of an A2 star, the hydrogen lines of an A6 star, and the metal lines of an A6 star, it is around 450[7] million years old and is spinning with a projected rotational velocity of 84 km/s.[8] The star has 2.27[7] times the mass of the Sun and is radiating five[6] times the Sun's luminosity from its photosphere at an effective temperature of 8,511 K.[2]


  1. ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051.
  2. ^ a b c d e f g Baines, Ellyn K.; et al. (2018), "Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer", The Astronomical Journal, 155 (1), 30, arXiv:1712.08109, Bibcode:2018AJ....155...30B, doi:10.3847/1538-3881/aa9d8b.
  3. ^ a b Barry, Don C. (1970). "Spectral Classification of a and F Stars". Astrophysical Journal Supplement. 19: 281. Bibcode:1970ApJS...19..281B. doi:10.1086/190209.
  4. ^ a b Abt, H. A.; Levy, S. G. (1985), "Improved study of metallic-line binaries", The Astrophysical Journal Supplement Series, 59: 229, Bibcode:1985ApJS...59..229A, doi:10.1086/191070.
  5. ^ a b de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, A61.
  6. ^ 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.
  7. ^ a b c d De Rosa, R. J.; et al. (January 2014), "The VAST Survey - III. The multiplicity of A-type stars within 75 pc", Monthly Notices of the Royal Astronomical Society, 437 (2): 1216–1240, arXiv:1311.7141, Bibcode:2014MNRAS.437.1216D, doi:10.1093/mnras/stt1932.
  8. ^ a b Royer, F.; et al. (October 2002), "Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i", Astronomy and Astrophysics, 393 (3): 897–911, arXiv:astro-ph/0205255, Bibcode:2002A&A...393..897R, doi:10.1051/0004-6361:20020943.
  9. ^ "HD 6658". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 24 August 2018.
  10. ^ Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
  11. ^ Lépine, Sébastien; Shara, Michael M. (March 2005), "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)", The Astronomical Journal, 129 (3): 1483–1522, arXiv:astro-ph/0412070, Bibcode:2005AJ....129.1483L, doi:10.1086/427854.