Mirach information

Mirach
	Location of Mirach (circled)
Observation data; Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Andromeda
Right ascension	01h 09m 43.91s
Declination	+35° 37′ 13.8″
Apparent magnitude (V)	2.067 (2.01 to 2.10)
Characteristics
Evolutionary stage	Asymptotic giant branch
Spectral type	M0 III
U−B color index	+1.96
B−V color index	+1.57
V−R color index	0.9
R−I color index	+1.00
Variable type	Semiregular
Astrometry
Radial velocity (Rv)	0.06±0.13 km/s
Proper motion (μ)	RA: 175.90 mas/yr ; Dec.: −112.20 mas/yr
Parallax (π)	16.52 ± 0.56 mas
Distance	199.27±9.27 ly ; (61.12±2.84 pc)
Absolute magnitude (MV)	−1.76
Details
Mass	2.49 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
	Mirach, Merach, Mirac, Mizar, β And, Beta Andromedae, Beta And, 43 Andromedae, 43 And, BD+34°198, FK5 42, GJ 53.3, 9044, HD 6860, HIP 5447, HR 337, SAO 54471, PPM 66010, WDS 01097+3537A, LTT 10420, NLTT 3848
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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[nsv-2] Cite error: The named reference nsv was invoked but never defined (see the help page).

[Eggen1992-3] Cite error: The named reference Eggen1992 was invoked but never defined (see the help page).

[araa11_29-4] Cite error: The named reference araa11_29 was invoked but never defined (see the help page).

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[Lepine2005-17] Cite error: The named reference Lepine2005 was invoked but never defined (see the help page).

Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Location of Mirach (circled)
Constellation	Andromeda
Right ascension	01^h 09^m 43.91^s^[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 (R_v)	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 (M_V)	−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
Mirach, Merach, Mirac, Mizar, β And, Beta Andromedae, Beta And, 43 Andromedae, 43 And, BD+34°198, FK5 42, GJ 53.3, 9044, HD 6860, HIP 5447, HR 337, SAO 54471, PPM 66010, WDS 01097+3537A, LTT 10420, NLTT 3848^[7]^[13]
Database references
SIMBAD	data

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