Meissa
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Double star Meissa (λ Orionis) |
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| Meissa is the blue star in the middle of the red cloud | |||||||||||||||||||||
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| AladinLite | |||||||||||||||||||||
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Observation dates equinox : J2000.0 , epoch : J2000.0 |
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| Constellation | Orion | ||||||||||||||||||||
| Right ascension | 05 h 35 m 8.28 s | ||||||||||||||||||||
| declination | + 09 ° 56 ′ 3 ″ | ||||||||||||||||||||
| Apparent brightness | 3.38 to 3.54 mag | ||||||||||||||||||||
| Typing | |||||||||||||||||||||
| Spectral class | O8 IIIf + B0.5 V | ||||||||||||||||||||
| Astrometry | |||||||||||||||||||||
| Radial velocity | (30.1 ± 1.4) km / s | ||||||||||||||||||||
| parallax | ~ 3 mas | ||||||||||||||||||||
| distance | (~ 1100) ly | ||||||||||||||||||||
| Physical Properties | |||||||||||||||||||||
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Other names and catalog entries |
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Meissa ("the glow") is the name of the double star λ Orionis (Lambda Orionis) in the constellation Orion , located between Betelgeuse and Bellatrix . The star has an apparent brightness of a maximum of +3.38 mag and belongs to the spectral class O8III. The distance from Meissa is approximately 1,100 light years . Meissa has a +5.61 mag bright companion of the spectral type B0.5V at an angular distance of 4.4 "at a position angle of 43 degrees, which can be seen in telescopes from an objective aperture of about 6 centimeters.
The star is also under the historical proper name Heka (from Arabic الهقعة, DMG al-haqʿa 'white spot').
The IAU Working Group on Star Names (WGSN) established the proper name Meissa as the standardized proper name for this star on July 20, 2016 .
