Saiph (Kappa Orionis)
Though at about the same distance as Rigel, Saiph looks fainter because its much higher temperature causes it to radiate much of its light in the ultraviolet part of the spectrum. Confusingly, its luminosity and temperature place it close to the region of hydrogen-fusion stability, as if it were just in the process of developing into a supergiant. Although it has a slightly variable spectrum, it makes a good background source of light with which the interstellar medium can be studied.
Related category NOTABLE STARS
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