Beta Andromedae
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| Observation data Equinox J2000 |
|
|---|---|
| Constellation | Andromeda |
| Right ascension | 01h 09m 43.9s |
| Declination | +35° 37′ 14″ |
| Apparent magnitude (V) | 2.07 |
| Characteristics | |
| Spectral type | M0 IIa |
| U-B color index | 1.96 |
| B-V color index | 1.58 |
| Variable type | Semiregular |
| Astrometry | |
| Radial velocity (Rv) | 3 km/s |
| Proper motion (μ) | RA: 177 mas/yr Dec.: -109 mas/yr |
| Parallax (π) | 16.36 ± 0.76 mas |
| Distance | 199 ± 9 ly (61 ± 3 pc) |
| Absolute magnitude (MV) | -1.87 |
| Details | |
| Mass | 3–4 M☉ |
| Radius | 130 R☉ |
| Luminosity | 1,900 L☉ |
| Temperature | 3,350 K |
| Metallicity | ? |
| Rotation | ? |
| Age | ? years |
| Other designations | |
Beta Andromedae (β And / β Andromedae) is a star in the constellation Andromeda. It also has the traditional name Mirach.
Mirach is a red giant of spectral class M0, approximately 200 light years away, with a mean apparent magnitude of 2.07. It is classified as a semiregular variable star and its brightness varies from magnitude +2.01 to +2.10.
Close by (in terms of celestial coordinates) is the galaxy known as Mirach's Ghost.
[edit] Location
The star's location is shown in the following chart of the Andromeda constellation:
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