27 Canis Majoris
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| Observation data Epoch J2000.0 Equinox J2000.0 |
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|---|---|
| Constellation | Canis Major |
| Right ascension | 07h14m15.2s |
| Declination | −26°21′09″ |
| Apparent magnitude (V) | +4.42 (+4.9/+5.4) |
| Absolute magnitude (V) | -4.00 (-3.5/-3.0) |
| Distance | 1580 ± 450 ly (480 ± 140 pc) |
| Spectral type | B3IIIe |
| Other designations | |
27 Canis Majoris, also called 27 CMa, is a star system in the constellation Canis Major. It is approximately 1580 light years from Earth and has a mean apparent magnitude of +4.42.
The primary component, 27 Canis Majoris A, is a blue-white B-type giant with an apparent magnitude of +4.9. It is also a spectroscopic binary with an orbital period of 0.262 days.
The second component, 27 Canis Majoris B, is separated from the primary by 0.1 arcseconds and has an orbital period of 31 years. Its apparent magnitude is +5.4 and it is classified as a Gamma Cassiopeiae type variable star. Due to its variable nature, the brightness of the system varies from magnitude +4.42 to +4.82.
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