Theta1 Orionis A

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Theta1 Orionis A
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Orion
Right ascension 05h 35m 15.84743s [1]
Declination −05° 23′ 14.3441″ [1]
Spectral type B0.5V [1]

Theta1 Orionis A (θ1 Ori A) is a variable trinary star in the constellation Orion. Its apparent magnitude range is 6.72 to 7.65 with a period of 65.432 days.[2] It is one of the main stars in The Trapezium in Orion, with the others being B, C, D and E.[3]


  1. ^ a b c SIMBAD, V1016 Orionis (accessed 4 January 2013)
  2. ^ "Trapezium (Theta1 Orionis)". The Worlds of David Darling. Retrieved 31 July 2014. 
  3. ^ "Theta-1 Orionis". Retrieved 31 July 2014.