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    Mintaka (Delta Orionis)

    Mintaka
    Mintaka is at the upper left. Credit: Digitized Sky Survey, ESA/ESO/NASA FITS Liberator
    The seventh brightest star in the constellation Orion and the westernmost and faintest star in Orion's Belt; its Arabic name means "the belt of the Central One." Mintaka is a multiple star system, the main components of which are a hot (30,000 K) B star and an even hotter O star, each with a mass of over 20 solar masses and a luminosity 70,000 times that of the Sun. These bright stars form a compact visual binary, with a period of 5.73 days and a maximum separation of 0.3", and also an Algol star system showing a dip of about 0.2 magnitude during mid-partial eclipse. Two much dimmer and remote companions trek around the central O-B couple. A magnitude 6.8 B star orbits at a distance of about 0.25 light-year, while, closer in, circles a magnitude 14 component.

    Mintaka is famous as a background against which the thin gas of interstellar space was first detected, when the German astronomer Johannes Hartmann (1865-1936) in 1904 discovered absorption in the star's spectrum that could not be produced by the orbiting pair.


    Visual magnitude 2.25
    Absolute magnitude -4.99
    Spectral type O9.5II + B2V
    Distance 916 light-years
    Position R.A. 05h 32m 0.4s,
    Dec. -00° 17' 57"


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