UPSILON SCORPII

'Upsilon Scorpii' (υ Sco / υ Scorpii) is a star in the constellation Scorpius. It also has the traditional name 'Lesath' (alternative spellings 'Leschath', 'Lesuth'), from Arabic ''las'a'' = "pass (or bite) of a poisonous animal"; but this is a miscorrection by Scaliger (a European astronomer who knew Arabic) for earlier "Alascha", which came from Arabic ''al laţkha'' = "the foggy patch", referring to the nearby open cluster M7.
It has apparent magnitude +2.7 and belongs to spectral class B2. It is approximately 519 light years from Earth. The star's luminosity is 12,300 times that of the Sun while its surface temperature measure in at 22,400 kelvins. The star has a radius of 7.5 times solar and a mass of 10 solar masses. Given its mass it is likely that υ Sco will end its life as a massive white dwarf.

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External link

★ Lesath article on Jim Kaler's ''Stars'' website