Omicron Cassiopeiae

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ο Cassiopeiae
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cassiopeia
Right ascension 00h44m43.51867s[1]
Declination +48°17′03.7136″[1]
Apparent magnitude (V) +4.50[1]
Distance 910 ± 210 ly
(278 ± 63 pc)
Spectral type B5IIIe[1]
Other designations
22 Cassiopeiae, HR 193, HD 4180, BD+47°183, FK5 25, HIP 3504, SAO 36620, GC 882, ADS 622, CCDM J00447+4817
Map of the Bayer-designated stars in Cassiopeia. Omicron Cassiopeiae is circled.

Omicron Cassiopeiae (ο Cas, ο Cassiopeiae) is a triple star system in the constellation Cassiopeia. It is approximately 910 light years from Earth.

The primary component, ο Cassiopeiae A, is a blue-white B-type giant with a mean apparent magnitude of +4.54 and a mass of 9.4.[2] It is classified as a Gamma Cassiopeiae type variable star and its brightness varies from magnitude +4.50 to +4.62. The primary is a spectroscopic binary, and its close companion completes one orbit every 2.83 years (1,031.3 days).[2] A more distant companion, ο Cassiopeiae B, lies 33.6 arcseconds away. It is an eleventh magnitude, yellow-white F-type main sequence dwarf.[2]


  1. ^ a b c d "Simbad". Results for Omicron Cassiopeiae. Retrieved December 27, 2016. 
  2. ^ a b c "The Be star omicron Cassiopeiae". Koubský, P., Ak, H., Harmanec, P., Yang, S., & Božić, H. Retrieved December 27, 2016.