| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aries |
| Right ascension | 01h 50m 08.56984s[1] |
| Declination | +22° 16′ 31.2100″[1] |
| Apparent magnitude (V) | 5.86[2] (6.4/7.2)[3] |
| Characteristics | |
| Spectral type | K1 III + A6 V[3] |
| U−B color index | +0.5[2] |
| B−V color index | +0.74[2] |
| Astrometry | |
| Radial velocity (Rv) | 6.95±0.13[4] km/s |
| Proper motion (μ) | RA: –16.52[1] mas/yr Dec.: –8.25[1] mas/yr |
| Parallax (π) | 5.57 ± 0.75 mas[1] |
| Distance | approx. 590 ly (approx. 180 pc) |
| Absolute magnitude (MV) | −0.39[4] |
| Details | |
| Luminosity | 141.51[4] L☉ |
| Other designations | |
| 1 Ari A: HD 11154. | |
| 1 Ari B: HD 11155. | |
| Database references | |
| SIMBAD | data |
1 Arietis is a double star[3] in the northern constellation of Aries. 1 Arietis is the Flamsteed designation. The pair have a combined visual magnitude of 5.86,[2] making it faintly visible to the naked eye. Based upon an annual parallax shift of 5.57 mas,[1] the distance to the two stars is approximately 590 light-years (180 parsecs). As of 2016, the secondary had an angular separation of 2.90″ along a position angle of 165° from the primary.[6] They are moving further from the Earth with a heliocentric radial velocity of +7 km/s.[4]
The brighter star, designated component A, is a magnitude 6.40 giant star with a stellar classification of K1 III. The companion star, component B, is a magnitude 7.20 A-type main sequence star with a classification of A6 V.[3] Helmut Abt (1985) had this star classified as A3 IV,[7] matching a more evolved subgiant.
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