Zeta Arietis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aries |
| Right ascension | 03h 14m 54.098s |
| Declination | +21° 02′ 40.01″ |
| Apparent magnitude (V) | +4.874±0.023 |
| Characteristics | |
| Spectral type | A1 V |
| U−B color index | −0.01 |
| B−V color index | −0.02 |
| Astrometry | |
| Radial velocity (Rv) | +7.3±2.8 km/s |
| Proper motion (μ) | RA: −26.276 mas/yr Dec.: −72.900 mas/yr |
| Parallax (π) | 12.7708±0.3734 mas |
| Distance | 255 ± 7 ly (78 ± 2 pc) |
| Absolute magnitude (MV) | +0.35 |
| Details | |
| Mass | 2.430±0.340 M☉ |
| Radius | 2.974±0.115 R☉ |
| Luminosity | 65.7±4.8 L☉ |
| Surface gravity (log g) | 3.88±0.07 cgs |
| Temperature | 9,528±117 K |
| Rotational velocity (v sin i) | 133 km/s |
| Age | 333 Myr |
| Other designations | |
| ζ Ari, 58 Arietis, BD+20 527, FK5 1089, GC 3872, HD 20150, HIP 15110, HR 972, SAO 75810, PPM 92319 | |
| Database references | |
| SIMBAD | data |
Zeta Arietis is a star in the northern constellation of Aries. Its name is a Bayer designation that is Latinized from ζ Arietis, and abbreviated Zeta Ari or ζ Ari. This star is dimly visible to the naked eye with an apparent visual magnitude of +4.87. Based upon an annual parallax shift of 12.77 mas, the distance to this star is approximately 255 light-years (78 parsecs). It is receding from the Sun with a radial velocity of +7 km/s.
This is an A-type main sequence star with a stellar classification of A1 V. It is an estimated 333 million years old and is spinning rapidly with a projected rotational velocity of 133 km/s. Zeta Arietis has 2.4 times the mass of the Sun and 3.0 times the Sun's radius. It is radiating 66 times the luminosity of the Sun from its photosphere at an effective temperature of 9,528 K, giving it the characteristic white-hued glow of an A-type star.