Gomeisa
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Star Gomeisa (β Canis Minoris) |
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| AladinLite | |||||||||||||||||||||
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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 | ||||||||||||||||||||
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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.