Zeta Arietis
 Location of ζ Arietis (circled) |
|
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Aries |
| Right ascension | 03h 14m 54.09731s[1] |
| Declination | +21° 02′ 40.0103″[1] |
| Apparent magnitude (V) | +4.89[2] |
| Characteristics | |
| Spectral type | A1 V[3] |
| U−B color index | –0.01[2] |
| B−V color index | –0.02[2] |
| Astrometry | |
| Radial velocity (Rv) | +7.0[4] km/s |
| Proper motion (μ) | RA: –27.83[1] mas/yr Dec.: –74.59[1] mas/yr |
| Parallax (π) | 12.44 ± 0.73[1] mas |
| Distance | 260 ± 20 ly (80 ± 5 pc) |
| Details | |
| Temperature | 9,500[5] K |
| Rotational velocity (v sin i) | 133[6] km/s |
| Other designations | |
Zeta Arietis (ζ Ari, ζ Arietis) is the Bayer designation for a star in the northern constellation of Aries. It is dimly visible to the naked eye with an apparent visual magnitude of +4.89.[2] Based upon an annual parallax shift of 12.44 mas,[1] the distance to this star is 260 ± 20 light-years (79.7 ± 6.1 parsecs). This is an A-type main sequence star with a stellar classification of A1 V.[3] It has a high rate of rotation with a projected rotational velocity of 133 km/s.[6] The star is shining at an effective temperature of 9,500 K,[5] giving it the characteristic white-hued glow of an A-type star.[8]
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.[9] According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, Al Buṭain were 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 dan ζ Ari as Al Buṭain IV.[10]
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.[11] Consequently, ζ Arietis itself is known as 天陰二 (Lóu Su èr, English: the Second Star of Yin Force.)[12]
References
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- ↑ (Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.
- ↑ (Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 22 日
