Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Aries |
Right ascension | 03h 11m 37.76465s[1] |
Declination | +19° 43′ 36.0397″[1] |
Apparent magnitude (V) | 4.349[2] |
Characteristics | |
Spectral type | K2 III[3] |
U−B color index | +0.914[2] |
B−V color index | +1.035[2] |
R−I color index | 0.51 |
Variable type | Suspected[4] |
Astrometry | |
Radial velocity (Rv) | 23.05 ± 0.20[3] km/s |
Proper motion (μ) | RA: +153.33[1] mas/yr Dec.: –8.28[1] mas/yr |
Parallax (π) | 19.22 ± 0.19 mas[1] |
Distance | 170 ± 2 ly (52.0 ± 0.5 pc) |
Absolute magnitude (MV) | +0.77[5] |
Details | |
Mass | 1.91[3] M☉ |
Radius | 10.42 ± 0.97[6] R☉ |
Luminosity | 45 ± 6[6] L☉ |
Surface gravity (log g) | 2.93[6] cgs |
Temperature | 4,810[6] K |
Metallicity [Fe/H] | –0.03[6] dex |
Rotational velocity (v sin i) | 4.3[7] km/s |
Other designations | |
Database references | |
SIMBAD | data |
Delta Arietis (δ Arietis, abbreviated Delta Ari, δ Ari), officially named Botein /ˈboʊtiːn/,[9] is a star in the northern constellation of Aries, 1.8 degrees north of the ecliptic. The apparent visual magnitude is 4.35,[2] so it is visible to the naked eye. It has an annual parallax shift of 19.22 mas;[1] corresponding to a distance of about 170 ly (52 pc) from the Sun.
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