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ο Leonis (Latinised to Omicron Leonis) is the star's Bayer designation.The designations of the two constituents as Omicron Leonis A and B, and those of A's components—Omicron Leonis Aa and Ab—derive from the convention used by the Washington Multiplicity Catalog (WMC) for multiple star systems, and adopted by the International Astronomical Union (IAU).
The spectral class of a star is a short code primarily summarizing the ionization state, giving an objective measure of the photosphere's temperature. Most stars are currently classified under the Morgan–Keenan (MK) system using the letters O, B, A, F, G, K, and M, a sequence from the hottest (O type) to the coolest (M type).
This is a relatively fast rotating star that completes a full revolution approximately every 1.5 days. (Compare this to the Sun , which at only 22 percent of this star's diameter rotates only once every 25.4 days.)
Sigma Orionis or Sigma Ori (σ Orionis, σ Ori) is a multiple star system in the constellation Orion, consisting of the brightest members of a young open cluster.It is found at the eastern end of the belt, south west of Alnitak and west of the Horsehead Nebula which it partially illuminates.
Gacrux has the MK system stellar classification of M3.5 III. [3] It has evolved off of the main sequence to become a red giant star, but is most likely on the red giant branch rather than the asymptotic giant branch. [9] Although only 50% more massive than the Sun, [6] at this stage the star has expanded to 73 [7] times the Sun's radius.
Beta Scorpii (β Scorpii, abbreviated Beta Sco, β Sco) is a multiple star system in the southern zodiac constellation of Scorpius. It bore the traditional proper name of Acrab / ˈ æ k r æ b / , [ 8 ] though the International Astronomical Union now regards that name as applying only to the β Scorpii Aa component.
Its stellar classification is given as kA7VmF0/2III/IVSr, indicating an Am star with calcium K-lines similar to an A7 main sequence star and hydrogen lines more like an F0 giant or subgiant star. The distance of Acubens calculated from the Gaia Data Release 2 parallax is roughly 50 parsecs from Earth , or approximately 164 light-years away.
λ Herculis (Latinised to Lambda Herculis) is the star's Bayer designation.. It bore the traditional name Maasym, from the Arabic مِعْصَم miʽṣam "wrist". In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN) [12] to catalogue and standardize proper names for stars.