Zeta Arietis

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Zeta Arietis
Diagram showing star positions and boundaries of the Aries constellation and its surroundings
Cercle rouge 100%.svg
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]
Spectral type A1 V[3]
U−B color index –0.01[2]
B−V color index –0.02[2]
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)
Absolute magnitude (MV) +0.35[5]
Luminosity 73[5] L
Temperature 9,500[6] K
Rotational velocity (v sin i) 133[7] km/s
Other designations
ζ Ari, 58 Arietis, BD+20 527, FK5 1089, HD 20150, HIP 15110, HR 972, SAO 75810.[8]
Database references

Zeta Arietis, Latinized from 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.[7] The star is shining at an effective temperature of 9,500 K,[6] giving it the characteristic white-hued glow of an A-type star.[9]


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.[10] 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.[11]

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.[12] Consequently, ζ Arietis itself is known as 天陰二 (Lóu Su èr, English: the Second Star of Yin Force.)[13]


  1. ^ a b c d e f van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752Freely accessible, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357. 
  2. ^ a b c d Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99), Bibcode:1966CoLPL...4...99J. 
  3. ^ a b Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819. 
  4. ^ Wielen, R.; et al. (1999), Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions (35), Astronomisches Rechen-Institut Heidelberg, Bibcode:1999VeARI..35....1W. 
  5. ^ a b Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971Freely accessible, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015. 
  6. ^ a b Theodossiou, E.; Danezis, E. (September 1991), "The stellar temperature scale for stars of spectral types from O8 to F6 and the standard deviation of the MK spectral classification", Astrophysics and Space Science, 183 (1): 91–115, Bibcode:1991Ap&SS.183...91T, doi:10.1007/BF00643019. 
  7. ^ a b Royer, F.; Zorec, J.; Gómez, A. E. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics, 463 (2): 671–682, arXiv:astro-ph/0610785Freely accessible, Bibcode:2007A&A...463..671R, doi:10.1051/0004-6361:20065224 
  8. ^ "zet Ari". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-08-04. 
  9. ^ "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, retrieved 2012-01-16 
  10. ^ Allen, R. H. (1963), Star Names: Their Lore and Meaning (Reprint ed.), New York, NY: Dover Publications Inc, p. 83, ISBN 0-486-21079-0, retrieved 2010-12-12. 
  11. ^ Rhoads, Jack W. (November 15, 1971), Technical Memorandum 33-507-A Reduced Star Catalog Containing 537 Named Stars (PDF), Jet Propulsion Laboratory, California Institute of Technology. 
  12. ^ (in 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.
  13. ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 22 日