51 Andromedae

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**51 Andromedae**
Observation data Epoch J2000
Image:51 Andromedae.jpg 51 Andromedae
Constellation (pronunciation)	Andromeda
Right ascension	01h 37m 59.5561s
Declination	+48° 37' 41.567"'
Apparent magnitude (V)	3.57
Characteristics
Spectral type	K3III
U-B color index	1.45
B-V color index	1.28
Variable type	None
Astrometry
Radial velocity (R_v)	16.1 km/s
Proper motion (μ)	RA: 60.90 mas/yr Dec.: -112.42 mas/yr
Parallax (π)	18.76 ± 0.74 mas
Distance	174 ± 7 ly (53 ± 2 pc)
Absolute magnitude (M_V)	5.833
Details
Mass	0.8 M_☉
Radius	0.9 R_☉
Surface gravity (log g)	?
Luminosity	0.4 L_☉
Temperature	3.500–5.000 K
Metallicity	?
Rotation	?
Age	? years
Other designations
ups Per, 2MASS J01375956+4837417, HD 9927, N30 331, TD1 920, AG+48° 198, HIC 7607, PLX 335, UBV M 8305, BD+47° 467, HIP 7607, PMC 90-93 37, UBV 1666, FK5 52, HR 464, PPM 44238, USNO 796, GAT 819, IRAS 01349+4822, RAFGL 237, GC 1966, IRC +50041, ROT 228, GCRV 910, JP11 513, SAO 37375.
Database references
SIMBAD	data

51 Andromedae is a star in the constellation Andromeda. It is occasionally called by the proper name Anfal or El Enfal (Arabic الانفال al-anfal meaning "the spoils" or "the plundered goods"), derived from السيف و الانفال al-sa'if wa al-anfal, meaning "The Sword and the Spoils", which was the title of an ancient Arab asterism between Andromeda and Perseus. It was once believed that Johann Bayer originally designated this star as Upsilon Persei (υ Persei), but Flamsteed's 51 Andromedae is now its official designation.