A constellation is an area on the celestial sphere in which a group of visible stars forms a perceived outline or pattern, typically representing an animal, mythological person or creature, or an inanimate object

Orion, in astronomy, is a major constellation lying at about 5 hours 30 minutes right ascension and 0° declination in the sky, named after the Greek mythological hunter. Orion is one of the most conspicuous constellations and contains many bright stars.

Rigel designated "β Orionis", is a blue supergiant star in the constellation of Orion, approximately 860 light-years from Earth. Rigel is the brightest and most massive component—and the eponym—of a star system of at least four stars that appear as a single blue-white point of light to the naked eye. A star of spectral type "B8Ia", Rigel is calculated to be anywhere from 61,500 to 363,000 times as luminous as the Sun, and 18 to 24 times as massive, depending on the method and assumptions used. Its radius is over 70 times that of the Sun, and its surface temperature is 12,100 K.

Rigel's mass-loss due to its stellar wind is estimated to be 10 million times more than that of the Sun. With an estimated age of 7 to 9 million years, Rigel has exhausted its core hydrogen fuel, expanded and cooled to become a supergiant. It will end its life as a type II supernova.

More Info: en.wikipedia.org