Xi Arietis
Star in the constellation Aries
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Xi Arietis is a binary star[9] system in the northern constellation of Aries. Its name is a Bayer designation that is Latinized from ξ Arietis, and abbreviated Xi Ari or ξ Ari. This system has an apparent visual magnitude of 5.46,[2] and so is dimly visible to the naked eye. Based upon an annual parallax shift of 3.74±0.29 mas as seen from Earth, it is 770 ± 30 light-years (236.1 ± 9.2 parsecs) distant from the Sun. At that distance, the visual magnitude is diminished by an extinction factor of 0.24 due to interstellar dust.[5] The proximity of this system to the ecliptic means it is subject to lunar occultations.[10]
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Aries |
| Right ascension | 02h 24m 49.058s[1] |
| Declination | +10° 36′ 38.01″[1] |
| Apparent magnitude (V) | +5.46[2] |
| Characteristics | |
| Spectral type | B7 IV[3] |
| U−B color index | −0.48[2] |
| B−V color index | −0.10[2] |
| Astrometry | |
| Radial velocity (Rv) | −0.5±2.8[4] km/s |
| Proper motion (μ) | RA: +20.979 mas/yr[1] Dec.: −15.022 mas/yr[1] |
| Parallax (π) | 4.2483±0.1511 mas[1] |
| Distance | 770 ± 30 ly (235 ± 8 pc) |
| Absolute magnitude (MV) | −0.43[5] |
| Details | |
| Mass | 4.85±0.13[6] M☉ |
| Luminosity | 1,000+186 −157[6] L☉ |
| Surface gravity (log g) | 3.897±0.017[7] cgs |
| Temperature | 13,627±100[7] K |
| Rotational velocity (v sin i) | 164±8[7] km/s |
| Age | 195[5] Myr |
| Other designations | |
| ξ Ari, ψ Ceti, 24 Arietis, BD+09°316, FK5 2164, GC 2901, HD 14951, HIP 11249, HR 702, SAO 92932, PPM 118200[8] | |
| Database references | |
| SIMBAD | data |
This is a double-lined spectroscopic binary.[9] The spectrum matches a stellar classification of B7 IV,[3] which suggests a subgiant star that has exhausted the supply of hydrogen at its core and is in the process of evolving into a giant star. Xi Arietis was once a designation for Psi Ceti (ψ Cet, ψ Ceti), and was later recognized to be a duplicate by Bayer.[11]