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.)
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