Back Mirach Afrikaans جنب المرأة المسلسلة Arabic Mirach AST Beta Andromeda BS Mirach Catalan Mirach Czech Mirach German Mirach Spanish Beta Andromedae Basque جنبالمسلسله Persian
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| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Andromeda |
| Right ascension | 01h 09m 43.91s[1] |
| Declination | +35° 37′ 13.8″[1] |
| Apparent magnitude (V) | 2.067[1] (2.01 to 2.10)[2] |
| Characteristics | |
| Evolutionary stage | Asymptotic giant branch[3] |
| Spectral type | M0 III[4][5] |
| U−B color index | +1.96[6] |
| B−V color index | +1.57[6] |
| V−R color index | 0.9[7] |
| R−I color index | +1.00[8] |
| Variable type | Semiregular[2] |
| Astrometry | |
| Radial velocity (Rv) | 0.06±0.13[9] km/s |
| Proper motion (μ) | RA: 175.90[10] mas/yr Dec.: −112.20[10] mas/yr |
| Parallax (π) | 16.52 ± 0.56 mas[10] |
| Distance | 199.27±9.27 ly (61.12±2.84 pc)[1] |
| Absolute magnitude (MV) | −1.76[11] |
| Details[5] | |
| Mass | 2.49[12][5] M☉ |
| Radius | 86.4 R☉ |
| Luminosity | 1,675 L☉ |
| Surface gravity (log g) | 0.541 cgs |
| Temperature | 3,802 K |
| Metallicity [Fe/H] | −0.03 dex |
| Rotation | <7900 d (<21.6 years) |
| Rotational velocity (v sin i) | 6 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
Mirach/ˈmaɪræk/,[14][15] Bayer designation Beta Andromedae, Latinized from β Andromedae, is a prominent star in the northern constellation of Andromeda. It is northeast of the Great Square of Pegasus and is potentially visible to all observers north of latitude 54° S. It is commonly used by stargazers to find the Andromeda Galaxy. The galaxy NGC 404, also known as Mirach's Ghost, is seven arcminutes away from Mirach.[16]
This star has an apparent visual magnitude of around 2.07,[1] varying between 2.01 and 2.10,[2] which at times makes it the brightest star in the constellation. Based upon parallax measurements, it is roughly 197 light-years (60 parsecs) from the Sun.[10] Its apparent magnitude is reduced by 0.06 by extinction due to gas and dust along the line of sight.[9] The star has a negligible radial velocity of 0.1 km/s,[9] but with a relatively large proper motion, traversing the celestial sphere at 0.208″·yr−1.[17]
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