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ζ Arae
	Location of ζ Arae (circled)
Observation data; Epoch J2000 Equinox J2000
Constellation	Ara
Right ascension	16h 58m 37.21217s
Declination	–55° 59′ 24.5203″
Apparent magnitude (V)	3.13
Characteristics
Spectral type	K3 III
U−B color index	+1.96
B−V color index	+1.60
Astrometry
Radial velocity (Rv)	–6.0 km/s
Proper motion (μ)	RA: –17.80 mas/yr ; Dec.: –36.67 mas/yr
Parallax (π)	5.7725 ± 0.1727 mas
Distance	570 ± 20 ly ; (173 ± 5 pc)
Absolute magnitude (MV)	–3.95
Details
Mass	7-8 M☉
Radius	114 R☉
Luminosity	3,800 L☉
Surface gravity (log g)	1.20 cgs
Temperature	4,246 K
Metallicity [Fe/H]	–0.40 dex
Age	40~50 Myr
Other designations
	Tseen Yin, GJ 9581, SAO 244315, HD 152786, FK5 631, HIP 83081, HR 6285, CPD−55° 7766
Database references
SIMBAD	data
ARICNS	data

Zeta Arae (ζ Ara, ζ Arae) is the third-brightest star in the southern constellation Ara.^[10] The apparent visual magnitude of this star is 3.1,^[2] which can be seen from suburban skies in the southern hemisphere. From the parallax measurements, it is located at a distance of 490 light-years (150 parsecs) from Earth.^[1]

The spectrum of this star matches a stellar classification of K3 III.^[3] The luminosity class of 'III' indicates this is a giant star that has exhausted the hydrogen at its core and evolved away from the main sequence. It is radiating energy from its outer atmosphere at an effective temperature of 4,246 K which is what gives it the orange hue of a K-type star.^[11] This star displays an excess of infrared emission that may indicate circumstellar matter.^[12]

In Chinese, 龜 (Guī), meaning Tortoise, refers to an asterism consisting of ζ Arae, ε¹ Arae, γ Arae, δ Arae and η Arae.^[13] Consequently, the Chinese name for ζ Arae itself is 龜五 (Guī wǔ, English: the Fifth Star of Tortoise.)^[14]

Allen called it Tseen Yin /ˌsiːnˈjɪn/, together with δ Arae, from the Chinese 天陰 (Mandarin pronunciation tiānyīn) "dark sky".^[15] However, 天陰 is in Aries.^[16]^[17] so Allen probably confused constellation "Ara" with "Ari".

References

^ ^a ^b ^c ^d ^e van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600
^ ^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): 99, Bibcode:1966CoLPL...4...99J
^ ^a ^b Houk, Nancy (1978), "Michigan catalogue of two-dimensional spectral types for the HD stars", University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations -90_ to -53_ƒ0, 1, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1975mcts.book.....H
^ Wielen, R.; et al. (1999), "Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions", Veröff. Astron. Rechen-Inst. Heidelb, 35 (35), Astronomisches Rechen-Institut Heidelberg: 1, Bibcode:1999VeARI..35....1W
^ Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
^ Jasniewicz, G.; et al. (February 1999), "Late-type giants with infrared excess. I. Lithium abundances", Astronomy and Astrophysics, 342: 831–838, Bibcode:1999A&A...342..831J
^ ^a ^b ^c ^d ^e Cruzalèbes, P.; Jorissen, A.; Rabbia, Y.; Sacuto, S.; Chiavassa, A.; Pasquato, E.; Plez, B.; Eriksson, K.; Spang, A.; Chesneau, O. (2013). "Fundamental parameters of 16 late-type stars derived from their angular diameter measured with VLTI/AMBER". Monthly Notices of the Royal Astronomical Society. 434 (1): 437. arXiv:1306.3288. Bibcode:2013MNRAS.434..437C. doi:10.1093/mnras/stt1037. S2CID 49573767.
^ Jones, K. L.; et al. (June 1992), "Spectroscopic investigation of cool giants and the authenticity of their reported microwave emission", Monthly Notices of the Royal Astronomical Society, 256 (3): 535–544, Bibcode:1992MNRAS.256..535J, doi:10.1093/mnras/256.3.535
^ "zet Ara -- Star", SIMBAD, Centre de Données astronomiques de Strasbourg, retrieved 2012-01-05
^ Kaler, Jim (13 July 2012). "Zeta Arae". Stars. University of Illinois. Retrieved 12 September 2019.
^ "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on 2013-12-03, retrieved 2012-01-16
^ Plets, H.; et al. (July 1997), "Giants with infrared excess", Astronomy and Astrophysics, 323: 513–523, Bibcode:1997A&A...323..513P
^ (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.
^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 1 日 Archived 2011-09-28 at the Wayback Machine
^ Allen, R. H. (1963). Star Names: Their Lore and Meaning (Reprint ed.). New York, NY: Dover Publications Inc. p. 64. ISBN 0-486-21079-0.
^ Chevalier, S., and Tsuchihashi, P., (1911): "Catalogue d'Étoiles fixes, observés a Pekin sous l'Empereur Kien Long (Qianlong (Chien-Lung)), XVIII^e siecle", Annales de l'Observatoire Astronomique de Zô-Sé.
^ 伊世同 (Yi Shi Tong) (1981): 『中西対照恒星図表』科学出版社.(in Chinese)