53 Arietis

53 Arietis
Observation data
Epoch J2000      Equinox J2000
Constellation Aries
Right ascension 03h 07m 25.67315s[1]
Declination +17° 52′ 47.9696″[1]
Apparent magnitude (V) 6.10[2]
Characteristics
Spectral type B1.5 V[3]
U−B color index [4] 0.80[2]
B−V color index −0.12[2]
Variable type β Cep[4]
Astrometry
Radial velocity (Rv)+21.2[5] km/s
Proper motion (μ) RA: −23.733[1] mas/yr
Dec.: +8.080[1] mas/yr
Parallax (π)3.1874 ± 0.0630 mas[1]
Distance1,020 ± 20 ly
(314 ± 6 pc)
Details
Mass7.5±0.2[6] M☉
Radius4.2[1] R☉
Luminosity1,962[1] L☉
Surface gravity (log g)3.99[1] cgs
Temperature19,065[1] K
Metallicity [Fe/H]−0.18[1] dex
Rotational velocity (v sin i)5[7] km/s
Other designations
UW Arietis, BD+17°493, HD 19374, HIP 14514, HR 938, SAO 93284.[8]
Database references
SIMBADdata

53 Arietis (abbreviated 53 Ari) is a variable star in the northern constellation of Aries. 53 Arietis is the Flamsteed designation; it also bears the variable star designation UW Arietis. It is a B-type main sequence star with a stellar classification of B1.5 V[3] and mean apparent magnitude of 6.10,[2] which is near the lower limit for naked eye visibility. Based upon an annual parallax shift of 3.2 mas, the estimated distance to this star is roughly 1,020 light-years (314 parsecs).

The claimed variability of 53 Arietis has not been confirmed.[4][9] [10] It is a runaway star with a peculiar velocity of 48.1 km/s relative to its neighbors.[6] The star was ejected from the Orion nebula some 4–5 million years ago, possibly when an orbiting companion exploded as a supernova.[11]

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