Theta Arietis
 Location of θ Arietis (circled) |
|
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Aries |
| Right ascension | 02h 18m 07.53838s[1] |
| Declination | +19° 54′ 04.1862″[1] |
| Apparent magnitude (V) | 5.58[2] |
| Characteristics | |
| Spectral type | A1 Vn[3] |
| U−B color index | +0.02[4] |
| B−V color index | +0.01[4] |
| Astrometry | |
| Radial velocity (Rv) | +6.0[2] km/s |
| Proper motion (μ) | RA: –13.19[1] mas/yr Dec.: +0.72[1] mas/yr |
| Parallax (π) | 7.29 ± 0.29[1] mas |
| Distance | 450 ± 20 ly (137 ± 5 pc) |
| Details | |
| Radius | 1.9–2.5[5] R☉ |
| Rotational velocity (v sin i) | 186[6] km/s |
| Other designations | |
Theta Arietis (θ Ari, θ Arietis) is the Bayer designation ]for a star in the northern constellation of Aries. It is faintly visible to the naked eye with an apparent visual magnitude of 5.58.[2] With an annual parallax shift of 7.29 mas,[1] the distance to this star is an estimated 450 light-years (140 parsecs) with a 20 light-year margin of error.
This is a white-hued, A-type main sequence star with a stellar classification of A1 Vn.[3] It is spinning at a rapid pace as shown by the projected rotational velocity of 186 km/s.[6] This is causing the "nebulous" appearance of the absorption lines indicated by the 'n' suffix in the classification.
References
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