Epoch J2000 Equinox J2000
|Right ascension||00h 56m 45.21211s|
|Declination||+38° 29′ 57.6380″|
|Apparent magnitude (V)||3.87|
|Spectral type||A5 V|
|U−B color index||+0.15|
|B−V color index||+0.12|
|Radial velocity (Rv)||+7.6 km/s|
|Proper motion (μ)||RA: +153.48 mas/yr
Dec.: +36.49 mas/yr
|Parallax (π)||25.14 ± 0.86 mas|
|Distance||130 ± 4 ly
(40 ± 1 pc)
|Surface gravity (log g)||3.99 cgs|
|Metallicity [Fe/H]||+0.03 dex|
|Rotational velocity (v sin i)||75 km/s|
Mu Andromedae (Mu And, μ Andromedae, μ And) is the Bayer designation for a star in the northern constellation of Andromeda. It has an apparent visual magnitude of 3.87, making it readily visible to the naked eye. Based upon parallax measurements, it is approximately 130 light-years (40 parsecs) from Earth. In the constellation, the star is situated about half way between the bright star Mirach to the southwest and the Andromeda Galaxy (M31) to the northeast.
The spectrum of this star matches a stellar classification of A5 V, indicating that it is an A-type main sequence star. It has double the mass of the Sun and 2.4 times the Sun's radius. The star is radiating about 21 times the luminosity of the Sun from its outer envelope at an effective temperature of 7,959 K, giving it the characteristic white glow of an A-type star. It is estimated to be about 600 million years old with a relatively high projected rotational velocity of 75 km/s.
In Chinese, 奎宿 (Kuí Sù), meaning Legs (asterism), refers to an asterism consisting of μ Andromedae, η Andromedae, 65 Piscium, ζ Andromedae, ε Andromedae, δ Andromedae, π Andromedae, ν Andromedae, β Andromedae, σ Piscium, τ Piscium, 91 Piscium, υ Piscium, φ Piscium, χ Piscium and ψ¹ Piscium. Consequently, μ Andromedae itself is known as 奎宿八 (Kuí Sù bā, English: the Eighth Star of Legs.)
- van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
- Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99), Bibcode:1966CoLPL...4...99J.
- Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.
- Wilson, R. E. (1953), General Catalogue of Stellar Radial Velocities, Carnegie Institute of Washington D.C., Bibcode:1953GCRV..C......0W.
- Malagnini, M. L.; Morossi, C. (November 1990), "Accurate absolute luminosities, effective temperatures, radii, masses and surface gravities for a selected sample of field stars", Astronomy and Astrophysics Supplement Series, 85 (3): 1015–1019, Bibcode:1990A&AS...85.1015M.
- Gardiner, R. B.; Kupka, F.; Smalley, B. (July 1999), "Testing convection theories using Balmer line profiles of A, F, and G stars", Astronomy and Astrophysics, 347: 876–890, Bibcode:1999A&A...347..876G.
- Royer, F.; Zorec, J.; Gómez, A. E. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics, 463 (2): 671–682, arXiv:, Bibcode:2007A&A...463..671R, doi:10.1051/0004-6361:20065224.
- Rieke, G. H.; et al. (February 2005), "Decay of Planetary Debris Disks", The Astrophysical Journal, 620 (2): 1010–1026, Bibcode:2005ApJ...620.1010R, doi:10.1086/426937.
- Reddy, Francis (2011), Celestial Delights: The Best Astronomical Events Through 2020 (3rd ed.), Springer, p. 236, ISBN 1461406099.
- "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, retrieved 2012-01-16.
- (Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 19 日