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Proper NameAludra
Bayer DesignationEta Canis Majoris
Flamsteed Number31 Canis Majoris
HR (BSC)2827
ConstellationCanis Major
Right Ascension7h 24m 6s
Declination-29° 18' 11"
Distancec.2,000 light years
c.600 parsecs
MagnitudeApparent: +2.5
Absolute: -6.47
Spectral ClassB5Ia Blue Supergiant
Optimum VisibilityJanuary / February
NotesThough it lies more than 2,000 light years from the Solar System, this brilliant pulsating supergiant star shines out against the backdrop of the Milky Way. At a distance of ten parsecs (the standard for calculating absolute magnitude) it would outshine even Venus at its brightest in the skies of Earth.


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