| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aries |
| Right ascension | 02h 06m 49.23558s[1] |
| Declination | +25° 42′ 16.3939″[1] |
| Apparent magnitude (V) | 6.01[2] |
| Characteristics | |
| Spectral type | B9 IV-Vn[3] |
| U−B color index | –0.26[4] |
| B−V color index | –0.04[4] |
| Astrometry | |
| Radial velocity (Rv) | –9[5] km/s |
| Proper motion (μ) | RA: +19.46[1] mas/yr Dec.: –14.31[1] mas/yr |
| Parallax (π) | 3.72 ± 0.38 mas[1] |
| Distance | approx. 880 ly (approx. 270 pc) |
| Details | |
| Radius | 2.8[6] R☉ |
| Rotational velocity (v sin i) | 249[7] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
11 Arietis (abbreviated 11 Ari) is a star in the northern constellation of Aries. 11 Arietis is the Flamsteed designation. It has an apparent visual magnitude of 6.01,[2] which makes it a challenging target to view with the naked eye in suitably dark skies. Based upon an annual parallax shift of 3.72 mas,[1] the distance to this star is approximately 880 light-years (270 parsecs).
11 Arietis has a stellar classification of B9 IV-Vn,[3] which may indicate that it is beginning to evolve away from the main sequence into a subgiant as the supply of hydrogen at its core becomes exhausted. At present, it has an estimated radius of 2.8[6] times that of the Sun, but this will increase as it continues to evolve into a giant star. 11 Arietis is spinning rapidly with a projected rotational velocity of 249 km/s.[7] This motion, combined with the Doppler effect, is causing the absorption lines in the spectrum to spread out and become 'nebulous', as indicated by the 'n' suffix in the classification.
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