World Library  
Flag as Inappropriate
Email this Article

Upsilon2 Eridani

Article Id: WHEBN0003113332
Reproduction Date:

Title: Upsilon2 Eridani  
Author: World Heritage Encyclopedia
Language: English
Subject: Upsilon1 Eridani, Upsilon4 Eridani, Upsilon3 Eridani, Eridanus (constellation), HR 1614
Publisher: World Heritage Encyclopedia

Upsilon2 Eridani

υ2 Eridani
Observation data
Epoch 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]
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]
Radial velocity (Rv) −4.0 ± 0.9[1] km/s
Proper motion (μ) RA: −48.92[1] mas/yr
Dec.: −12.75[1] mas/yr
Parallax (π) 15.62 ± 0.63[1] mas
Distance 209 ± 8 ly
(64 ± 3 pc)
Absolute magnitude (MV) 0.91 ± 0.07[3]
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 [Fe/H] +0.24[3] dex
Age 3.12 ± 1.15[3] Gyr
Other designations
Theemim, Theemin, Beemin, υ2 Eri, Upsilon2 Eridani, Upsilon2 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

Upsilon2 Eridani (Upsilon2 Eri, υ2 Eridani, υ2 Eri) is a G-type giant star in the constellation of Eridanus.[1] It has an apparent visual magnitude of approximately 3.817 and is approximately 209 light-years from the Earth.[1] It also has the names Theemim (also Theemin) and Beemin.[2][4]

In Chinese, 天園 (Tiān Yuán), meaning Celestial Orchard, refers to an asterism consisting of υ2 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] Consequently, υ2 Eridani itself is known as 天園十二 (Tiān Yuán shíèr, English: the Twelfth Star of Celestial Orchard.)[6]


  1. ^ a b c d e f g h i j k , database entry, SIMBAD. Accessed on line September 25, 2008.
  2. ^ 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.
  3. ^ a b c d e f g
  4. ^ a b p. 123, The Cambridge Guide to the Constellations, Michael E. Bakich, Cambridge University Press, 1995, ISBN 0-521-44921-9.
  5. ^ (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.
  6. ^ (Chinese) 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.

This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.

Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.