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Lambda Orionis (λ Ori / λ Orionis) is a star in the constellation Orion. It also has the traditional names Meissa or Heka. Meissa is a blue spectral type O giant star and is part of the Collinder 69 star cluster. It has an apparent visible magnitude 3.39 and is one of the most luminous stars known. The traditional names are from Arabic maisan "sparkling" and haq’ah "white spot". Meissa is actually a binary star system. The fainter star is of magnitude 12 and is 4.4 seconds of arc away from the brighter. It is a hot blue-white dwarf of spectral type B0.5 V.
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