S Orionis

From Wikipedia, the free encyclopedia
Jump to: navigation, search
S Orionis
Observation data
Epoch J2000      Equinox J2000
Constellation Orion
Right ascension 05h 29m 00.8948s[1]
Declination −04° 41′ 32.748″[1]
Apparent magnitude (V) 9.20[1]
Spectral type M7e
U−B color index +0.15[1]
B−V color index +1.73[1]
Variable type Mira variable
Proper motion (μ) RA: 14.77 mas/yr
Dec.: -10.87 mas/yr
Parallax (π) 0.32 ± 2.56 mas
Radius 400—500 R
Other designations

S Orionis is a red giant star in the constellation Orion. It is a Mira variable that pulsates with a 420–day cycle, and varies in radius from 1.9 to 2.3 astronomical units.[2]


  1. ^ a b c d e f "SIMBAD query result: V* S Ori -- Emission-line Star". Centre de Données astronomiques de Strasbourg. Retrieved 2007-06-15. 
  2. ^ "Chronicle of a Death Foretold". ESO. May 31, 2007. Retrieved 2007-06-15.