Zeta Arietis
Star in the constellation Aries
From Wikipedia, the free encyclopedia
Zeta Arietis is a star in the northern constellation of Aries. Its name is a Bayer designation that is Latinized from ζ Arietis, and abbreviated Zeta Ari or ζ Ari. This star is dimly visible to the naked eye with an apparent visual magnitude of +4.87.[3] Based upon an annual parallax shift of 12.77 mas,[2] the distance to this star is approximately 255 light-years (78 parsecs). It is receding from the Sun with a radial velocity of +7 km/s.[6]
 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aries[1] |
| Right ascension | 03h 14m 54.098s[2] |
| Declination | +21° 02′ 40.01″[2] |
| Apparent magnitude (V) | +4.874±0.023[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | A1 V[4] |
| U−B color index | −0.01[5] |
| B−V color index | −0.02[5] |
| Astrometry | |
| Radial velocity (Rv) | +7.3±2.8[6] km/s |
| Proper motion (μ) | RA: −26.276 mas/yr[2] Dec.: −72.900 mas/yr[2] |
| Parallax (π) | 12.7708±0.3734 mas[2] |
| Distance | 255 ± 7 ly (78 ± 2 pc) |
| Absolute magnitude (MV) | +0.35[1] |
| Details | |
| Mass | 2.430±0.340[3] M☉ |
| Radius | 2.974±0.115[3] R☉ |
| Luminosity | 65.7±4.8[3] L☉ |
| Surface gravity (log g) | 3.88±0.07[3] cgs |
| Temperature | 9,528±117[3] K |
| Rotational velocity (v sin i) | 133[7] km/s |
| Age | 333[8] Myr |
| Other designations | |
| ζ Ari, 58 Arietis, BD+20 527, FK5 1089, GC 3872, HD 20150, HIP 15110, HR 972, SAO 75810, PPM 92319[9] | |
| Database references | |
| SIMBAD | data |
This is an A-type main sequence star with a stellar classification of A1 V.[4] It is an estimated 333[8] million years old and is spinning rapidly with a projected rotational velocity of 133 km/s.[7] Zeta Arietis has 2.4 times the mass of the Sun and 3.0 times the Sun's radius.[3] It is radiating 66 times the luminosity of the Sun from its photosphere at an effective temperature of 9,528 K,[3] giving it the characteristic white-hued glow of an A-type star.[10]
Name
This star, along with δ Ari, ε Ari, π Ari, and ρ3 Ari, were Al Bīrūnī's Al Buṭain (ألبطين), the dual of Al Baṭn, the Belly.[11] According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, Al Buṭain was the title for five stars: δ Ari as Botein, π Ari as Al Buṭain I, ρ3 Ari as Al Buṭain II, ε Ari as Al Buṭain III, and ζ Ari as Al Buṭain IV.[12]
In Chinese, 天陰 (Tiān Yīn), meaning Yin Force, refers to an asterism consisting of ζ Arietis, 63 Arietis, δ Arietis, τ Arietis and 65 Arietis.[13] Consequently, the Chinese name for ζ Arietis itself is 天陰二 (Lóu Su èr, English: the Second Star of Yin Force.)[14]