Gomeisa
Star Gomeisa (β Canis Minoris) |
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AladinLite | |||||||||||||||||||||
Observation dates equinox : J2000.0 , epoch : J2000.0 |
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Constellation | Small dog | ||||||||||||||||||||
Right ascension | 07 h 27 m 9.05 s | ||||||||||||||||||||
declination | + 08 ° 17 ′ 21.5 ″ | ||||||||||||||||||||
Apparent brightness | 2.89 (2.84 to 2.92) mag | ||||||||||||||||||||
Typing | |||||||||||||||||||||
B − V color index | (−0.09) | ||||||||||||||||||||
U − B color index | (−0.28) | ||||||||||||||||||||
R − I index | (−0.06) | ||||||||||||||||||||
Spectral class | B8 Ve | ||||||||||||||||||||
Variable star type | GCAS | ||||||||||||||||||||
Astrometry | |||||||||||||||||||||
Radial velocity | (22.0 ± 2.5) km / s | ||||||||||||||||||||
parallax | (20.35 ± 1.22) mas | ||||||||||||||||||||
distance | (160 ± 10) ly (49) pc |
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Proper movement | |||||||||||||||||||||
Rec. Share: | (−59.4 ± 1.7) mas / a | ||||||||||||||||||||
Dec. portion: | (−35.0 ± 1.4) mas / a | ||||||||||||||||||||
Physical Properties | |||||||||||||||||||||
Effective temperature | 11500 K | ||||||||||||||||||||
Other names and catalog entries |
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Gomeisa is the name of the star β Canis Minoris (Beta Canis Minoris) in the constellation Little Dog . The name comes from Arabicالغميصاء / al-ġumaiṣāʾ / 'the little one with the cloudy eyes'. However, this name is not related to the name of the constellation and its mythology , but has other origins.
Gomeisa is a main sequence star with an apparent magnitude of +2.9 mag at a distance of 50 parsecs or about 160 light years . Its effective temperature is 11500 Kelvin. Its spectral class is B (more precisely B8Ve), which makes it one of the Be stars . Based on its spectrum , one assumes, like the sun, that it burns hydrogen in helium in its core.