Beta Eridani

Beta Eridani
β Eridani
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Eridanus
Right ascension 05h 07m 50.9851s[1]
Declination −05° 05′ 11.206″[1]
Apparent magnitude (V) 2.72 to 2.80[2]
Characteristics
Spectral type A3III[1]
U−B color index +0.10[3]
B−V color index +0.13[3]
R−I color index +0.08[3]
Astrometry
Other designations
Cursa, Dhalim, Kursa, β Eri, Beta Eridani, Beta Eri, 67 Eridani, 67 Eri, BD−05 1162, CCDM J05079-0506A, FK5 188, GC 6274, GJ 9175, HD 33111, HIP 23875, HR 1666, IDS 05030-0513 A, PPM 187729, SAO 131794, WDS 05078-0505A.[1][3][4]
Database references
SIMBAD data

Beta Eridani (Beta Eri, β Eridani, β Eri) is the second brightest star in the constellation of Eridanus, located in the northeast end of this constellation. It has the traditional names Cursa.[3][5]

The term Cursa is derived from Al Kursiyy al Jauzah, "the Chair (or "Footstool") of the Central One". This is the name of star association consisting this star, along with λ Eri, ψ Eri and τ Ori[6]

According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, Al Kursiyy al Jauzah were the title for three stars :β Eri as Cursa, ψ Eridani as Al Kursiyy al Jauzah I and λ Eridani as Al Kursiyy al Jauzah II (exclude τ Orionis)[7]

In Chinese, 玉井 (Yù Jǐng), meaning Jade Well, refers to an asterism consisting of β Eridani, λ Eridani, ψ Eridani and τ Orionis.[8] Consequently, β Eridani itself is known as 玉井三 (Yù Jǐng sān, English: the Third Star of Jade Well.).[9] From this Chinese name, the name Yuh Tsing was appeared.[10]

Properties

β Eridani has an apparent visual magnitude which varies between 2.72 and 2.80 and a spectral type of A3III. It is approximately 90 light-years from the Earth.[1][2] It may be a member of the proposed Sirius Supercluster, along with other scattered stars such as Sirius itself, Beta Aurigae, Alpha Coronae Borealis, Zeta Crateris, and Beta Serpentis.[11]

Visual companion

CCDM J05079-0506B
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Eridanus
Right ascension 05h 07m 55.8s[12]
Declination −05° 06′ 38″[12]
Apparent magnitude (V) 10.9[12]
Position (relative to A)
Epoch of observation 1998
Angular distance 117.1″ [4]
Position angle 137° [4]
Other designations
BD−05 1162B, IDS 05030-0513 B, WDS 05078-0505B.[4][12]
Database references
SIMBAD data

β Eridani has a visual companion, CCDM J05079-0506B, which has an apparent visual magnitude of approximately 10.9.[12]

References

  1. ^ a b c d e SV* ZI 351 -- Variable Star, database entry, SIMBAD. Accessed on line September 17, 2008.
  2. ^ a b NSV 1841, database entry, New Catalogue of Suspected Variable Stars, the improved version, Sternberg Astronomical Institute, Moscow, Russia. Accessed on line September 17, 2008.
  3. ^ a b c d e HR 1666, 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 17, 2008.
  4. ^ a b c d Entry 05078-0505, The Washington Double Star Catalog, United States Naval Observatory. Accessed on line September 17, 2008.
  5. ^ Cursa, Stars, Jim Kaler. Accessed on line September 17, 2008.
  6. ^ Allen, R. H. (1963). Star Names: Their Lore and Meaning (Reprint ed.). New York, NY: Dover Publications Inc. p. 218. ISBN 0486210790. http://penelope.uchicago.edu/Thayer/E/Gazetteer/Topics/astronomy/_Texts/secondary/ALLSTA/Eridanus*.html. Retrieved 2010-12-12. 
  7. ^ Jack W. Rhoads - Technical Memorandum 33-507-A Reduced Star Catalog Containing 537 Named Stars, Jet Propulsion Laboratory, California Institute of Technology; November 15, 1971
  8. ^ (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 9789867332257.
  9. ^ (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.
  10. ^ Richard Hinckley Allen: Star Names — Their Lore and Meaning: Eridanus
  11. ^ Eggen, Olin J. (1992). "The Sirius supercluster in the FK5". Astronomical Journal 104 (4): 1493–1504. Bibcode 1992AJ....104.1493E. doi:10.1086/116334. 
  12. ^ a b c d e BD-05 1162B -- Star in double system, database entry, SIMBAD. Accessed on line September 17, 2008.

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