Iota Canis Majoris

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ι Canis Majoris
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Canis Major
Right ascension 06h 56m 08.2s
Declination −17° 03′ 15″
Apparent magnitude (V) +4.36
Distance 3100 ± 1900 ly
(940 ± 580 pc)
Spectral type B3Ib
Other designations
20 Canis Majoris, HR 2596, HD 51309, BD −16° 1661, FK5 2536, HIP 33347, SAO 152126, GC 9107

Iota Canis Majoris (ι CMa, ι Canis Majoris) is a star in the constellation Canis Major.

Iota Canis Majoris is a blue-white B-type bright giant with a mean apparent magnitude of +4.36. It is approximately 3100 light years from Earth. This star has 24.9 times the radius of the Sun.[1] It is classified as a Beta Cephei type variable star and its brightness varies from magnitude +4.36 to +4.40 with a period of 1.92 hours.[2]


  1. ^ Underhill, A. B. et al. (November 1979), "Effective temperatures, angular diameters, distances and linear radii for 160 O and B stars", Monthly Notices of the Royal Astronomical Society 189: 601–605, Bibcode:1979MNRAS.189..601U, doi:10.1093/mnras/189.3.601 
  2. ^ Watson, Christopher (4 January 2010). "Iota Canis Majoris". AAVSO Website. American Association of Variable Star Observers. Retrieved 2 March 2014.