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  2. Betelgeuse - Wikipedia

    en.wikipedia.org/wiki/Betelgeuse

    Betelgeuse typically shows only small brightness changes near to magnitude +0.5, although at its extremes it can become as bright as magnitude 0.0 or as faint as magnitude +1.6. Betelgeuse is listed in the General Catalogue of Variable Stars with a possible period of 2,335 days. [ 8 ]

  3. Apparent magnitude - Wikipedia

    en.wikipedia.org/wiki/Apparent_magnitude

    seen from 1 AU away −40.17 star η Carinae A seen from 1 AU away −40.07: star Zeta 1 Scorpii: seen from 1 AU away −39.66: star R136a1: seen from 1 AU away −39.47 star P Cygni: seen from 1 AU away −38.00: star Rigel: seen from 1 AU away would be seen as a large, very bright bluish disk of 35° apparent diameter −37.42 star Betelgeuse