11 Andromedae

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11 Andromedae
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension  23h 19m 29.80701s[1]
Declination +48° 37′ 31.1615″[1]
Apparent magnitude (V) 5.44[2]
Spectral type K0 III[3]
U−B color index +0.82[4]
B−V color index +1.014±0.003[2]
Radial velocity (Rv)+9.99±0.14[1] km/s
Proper motion (μ) RA: +22.597[1] mas/yr
Dec.: +52.689[1] mas/yr
Parallax (π)11.5097 ± 0.0858[1] mas
Distance283 ± 2 ly
(86.9 ± 0.6 pc)
Absolute magnitude (MV)0.73[2]
Mass2.57[5] M
Radius12[6] R
Luminosity62.86[2] L
Surface gravity (log g)2.61[5] cgs
Temperature4,874[5] K
Metallicity [Fe/H]−0.13±0.07[7] dex
Rotational velocity (v sin i)1.0[8] km/s
Other designations
11 And, BD+47° 4110, GC 32476, HD 219945, HIP 115152, HR 8874, SAO 52907, PPM 64074[9]
Database references

11 Andromedae, abbreviated 11 And, is a single,[10] orange-hued star in the northern constellation of Andromeda. 11 Andromedae is the Flamsteed designation. It has an apparent visual magnitude of 5.44,[2] which is bright enough to be faintly visible to the naked eye. An annual parallax shift of 11.5 mas[1] yields a distance estimate of 283 light years. It is moving further from the Earth with a heliocentric radial velocity of +10 km/s.[1]

This is an evolved giant star with a stellar classification of K0 III,[3] which means it has exhausted the supply of hydrogen at its core and turned off the main sequence, it has an estimated 2.57[5] times the mass of the Sun and has expanded to around 12[6] times the Sun's radius. It is radiating 63[2] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,874 km/s.[5]


  1. ^ a b c d e f g h 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 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.
  3. ^ a b Griffin, R. F.; Redman, R. O. (1960), "Photoelectric measurements of the lambda 4200 A CN band and the G band in G8-K5 spectra", Monthly Notices of the Royal Astronomical Society, 120: 287, Bibcode:1960MNRAS.120..287G, doi:10.1093/mnras/120.4.287.
  4. ^ Hoffleit, D.; Warren Jr., W. H., "HR 8874, database entry", The Bright Star Catalogue (5th Revised (Preliminary Version) ed.), CDS. ID V/50. Accessed on line August 21, 2008.
  5. ^ a b c d e Liu, Y. J.; et al. (April 2014), "The Lithium Abundances of a Large Sample of Red Giants", The Astrophysical Journal, 785 (2): 12, arXiv:1404.1687, Bibcode:2014ApJ...785...94L, doi:10.1088/0004-637X/785/2/94, 94.
  6. ^ a b Pasinetti Fracassini, L. E.; Pastori, L.; Covino, S.; Pozzi, A. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics (Third ed.), 367: 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451
  7. ^ Gáspár, András; et al. (2016), "The Correlation between Metallicity and Debris Disk Mass", The Astrophysical Journal, 826 (2): 171, arXiv:1604.07403, Bibcode:2016ApJ...826..171G, doi:10.3847/0004-637X/826/2/171.
  8. ^ De Medeiros, J. R.; et al. (November 2000), "Rotation and lithium in single giant stars", Astronomy and Astrophysics, 363: 239–243, arXiv:astro-ph/0010273, Bibcode:2000A&A...363..239D.
  9. ^ "11 And". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved September 18, 2018.
  10. ^ 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.