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υ2 Eridani
Observation dataEpoch J2000.0 Equinox J2000.0 (ICRS )
Constellation
Eridanus
Right ascension 04h 35m 33.0385s [ 1]
Declination
−30° 33′ 44.429″[ 1]
Apparent magnitude (V)3.817[ 1]
Characteristics
Spectral type
G8IIIa[ 1]
U−B color index
+0.72[ 2]
B−V color index
+0.98[ 2]
R−I color index
+0.49[ 2]
Astrometry Radial velocity (Rv )−4.0 ± 0.9[ 1] Proper motion (μ) RA: −48.92[ 1] mas /yr Dec.: −12.75[ 1] mas /yr Parallax (π)15.62 ± 0.63 mas [ 1] Distance 209 ± 8 ly pc ) Absolute magnitude (MV )0.91 ± 0.07 [ 3] Details Mass 1.38 ± 0.19 [ 3] M ☉ Radius 11.4 ± 0.6 [ 3] R ☉ Surface gravity (log g )2.43 ± 0.09 [ 3] cgs Temperature 4522[ 3] K Metallicity +0.24[ 3] dex Age 3.12 ± 1.15 [ 3] Gyr Other designations Theemim, Theemin, Beemin, υ
2 Eri, Upsilon
2 Eridani, Upsilon
2 Eri,
52 Eridani , 52 Eri,
CD −30° 1901,
CPD −30 631,
FK5 170,
GC 5614,
HD 29291,
HIP 21393,
HR 1464,
PPM 280424,
SAO 195148.
[ 1] [ 2] [ 4] Database references SIMBAD data
Upsilon2 Eridani (Upsilon2 Eri , υ2 Eridani , υ2 Eri ) is a G-type giant star in the constellation of Eridanus .[ 1] apparent visual magnitude of approximately 3.817 and is approximately 209 light-years from the Earth .[ 1] Theemim (also Theemin ) and Beemin .[ 2] [ 4]
In Chinese , 天園 Tiān Yuán Celestial Orchard 2 Eridani, χ Eridani , φ Eridani , κ Eridani , HD 16754 , HD 23319 , θ Eridani , HD 24072 , HD 24160 , υ4 Eridani , 43 Eridani and υ1 Eridani .[ 5] 2 Eridani itself is known as 天園十二 Tiān Yuán shíèr Template:Lang-en .)[ 6]
References
^ a b c d e f g h i j k * 52 Eri -- Star , database entry, SIMBAD . Accessed on line September 25, 2008.^ a b c d e HR 1464 , database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50 . Accessed on line September 25, 2008.^ a b c d e f g da Silva, L.; et al. (November 2006), "Basic physical parameters of a selected sample of evolved stars", Astronomy and Astrophysics , 458 (2): 609–623, arXiv :astro-ph/0608160 Bibcode :2006A&A...458..609D , doi :10.1051/0004-6361:20065105 ^ a b p. 123, The Cambridge Guide to the Constellations , Michael E. Bakich, Cambridge University Press, 1995, ISBN 0-521-44921-9.
^ Template:Zh icon 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.^ Template:Zh icon 香港太空館 - 研究資源 - 亮星中英對照表 , Hong Kong Space Museum. Accessed on line November 23, 2010.
