53 Arietis
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 and mean apparent magnitude of 6.10, 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 |
| Declination | +17° 52′ 47.9696″ |
| Apparent magnitude (V) | 6.10 |
| Characteristics | |
| Spectral type | B1.5 V |
| U−B color index | 0.80 |
| B−V color index | −0.12 |
| Variable type | β Cep |
| Astrometry | |
| Radial velocity (Rv) | +21.2 km/s |
| Proper motion (μ) | RA: −23.733 mas/yr Dec.: +8.080 mas/yr |
| Parallax (π) | 3.1874 ± 0.0630 mas |
| Distance | 1,020 ± 20 ly (314 ± 6 pc) |
| Details | |
| Mass | 7.5±0.2 M☉ |
| Radius | 4.2 R☉ |
| Luminosity | 1,962 L☉ |
| Surface gravity (log g) | 3.99 cgs |
| Temperature | 19,065 K |
| Metallicity [Fe/H] | −0.18 dex |
| Rotational velocity (v sin i) | 5 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
53 Arietis is a Beta Cephei variable. It is a runaway star with a peculiar velocity of 48.1 km/s relative to its neighbors. The star was ejected from the Orion nebula some 4–5 million years ago, possibly when an orbiting companion exploded as a supernova.
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