description Adhara Overview
Adhara is a binary star system located approximately 430 light-years away in the constellation Canis Major. The primary component is a blue-white giant or supergiant star that ranks as the second-brightest star in the constellation after Sirius. Historically significant for its ultraviolet emissions, it was the strongest source of ultraviolet light in the sky known to early space-based observatories. The star is of interest to professional astronomers studying stellar evolution and amateur observers charting the winter sky.
insights Ranking position
Adhara ranks #70 of 212 in the Star ranking, behind Gacrux, ahead of Kepler-452.
help Adhara FAQ
What constellation is Adhara in?
Adhara is located in the constellation Canis Major, the Greater Dog. It is the second-brightest star in the constellation after Sirius, which is the brightest star in the entire night sky. Adhara is visible primarily from the Southern Hemisphere and lower northern latitudes.
How far away is Adhara from Earth?
Adhara is approximately 430 light-years from Earth. Its blue-white light has traveled over four centuries to reach us. Despite its great distance, it appears as one of the brighter stars in the sky because of its intrinsic luminosity.
What type of star is Adhara?
Adhara is a blue-white giant star, specifically classified as a B-type star on the main sequence or giant branch. It is significantly hotter and more massive than the Sun. Blue-white stars of this type are known for their high surface temperatures and strong ultraviolet output.
Why is Adhara notable for ultraviolet emissions?
Adhara is one of the strongest ultraviolet sources in the sky, due to its high surface temperature and luminosity as a B-type giant star. At the time of its discovery in ultraviolet surveys, it was among the brightest UV-emitting stars detected. This property has made it a subject of interest in ultraviolet stellar astronomy.
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