53 Arietis
Star in the constellation Aries
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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).
| 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 | |
| Evolutionary stage | main sequence[1] |
| Spectral type | B1.5 V[3] |
| U−B color index | +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] |
| Distance | 1,020 ± 20 ly (314 ± 6 pc) |
| Details | |
| Mass | 7.5±0.2[6] M☉ |
| Radius | 4.2[1] R☉ |
| Luminosity | 1,962[1] L☉ |
| Surface gravity (log g) | 3.99[1] cgs |
| Temperature | 19,065[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 | |
| SIMBAD | data |
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] Barnard's Loop is believed to be the remnant of the supernova that launched the star. [12]