Upsilon4 Eridani

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Upsilon4 Eridani
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Eridanus
Right ascension 04h 17m 53.66s[1]
Declination −33° 47′ 54.1″[1]
Apparent magnitude (V) 3.56[2]
Spectral type B8V + B9.5V[3]

Upsilon4 Eridani is a spectroscopic binary star system in the constellation Eridanus. Its apparent magnitude is 3.56.[2] Located around 54.56 parsecs (178.0 ly) distant,[1] the system is composed of two blue main-sequence stars one of spectral type B8V and the other B9.5V. It is possible that a nearby K-type star is also related.[3]


  1. ^ a b c van Leeuwen, F. (November 2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752free to read. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. 
  2. ^ a b Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237: 0. Bibcode:2002yCat.2237....0D. 
  3. ^ a b Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv:0806.2878free to read. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x.