Mu Andromedae
 Location of μ Andromedae (circled) |
|
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Andromeda |
| Right ascension | 00h 56m 45.21211s[1] |
| Declination | +38° 29′ 57.6380″[1] |
| Apparent magnitude (V) | 3.87[2] |
| Characteristics | |
| Spectral type | A5 V[3] |
| U−B color index | +0.15[2] |
| B−V color index | +0.12[2] |
| Astrometry | |
| Radial velocity (Rv) | +7.6[4] km/s |
| Proper motion (μ) | RA: +153.48[1] mas/yr Dec.: +36.49[1] mas/yr |
| Parallax (π) | 25.14 ± 0.86[1] mas |
| Distance | 130 ± 4 ly (40 ± 1 pc) |
| Details | |
| Mass | 2.0[5] M☉ |
| Radius | 2.4[5] R☉ |
| Luminosity | 21[5] L☉ |
| Surface gravity (log g) | 3.99[5] cgs |
| Temperature | 7,959[6] K |
| Metallicity [Fe/H] | +0.03[6] dex |
| Rotational velocity (v sin i) | 75[7] km/s |
| Age | 600[8] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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,[2] making it readily visible to the naked eye. Based upon parallax measurements, it is approximately 130 light-years (40 parsecs) from Earth.[1] 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.[9]
The spectrum of this star matches a stellar classification of A5 V,[3] 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.[5] The star is radiating about 21[5] times the luminosity of the Sun from its outer envelope at an effective temperature of 7,959 K,[6] giving it the characteristic white glow of an A-type star.[10] It is estimated to be about 600 million years old[8] with a relatively high projected rotational velocity of 75 km/s.[7]
Naming
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.)[11]
References
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- ↑ 2.0 2.1 2.2 2.3 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 3.0 3.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 5.0 5.1 5.2 5.3 5.4 5.5 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 6.0 6.1 6.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 7.0 7.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 8.0 8.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ (Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 19 日
