Stars

Epsilon Sagittarii, also known as Kaus Australis, has an apparent visual magnitude of +1.85, making it the most luminous star in the southern sky constellation of Sagittarius. Along with the stars Gamma Sagittarii, Delta Sagittarii, …

Although the star is named after the famous American astronomer E.E. Barnard, he did not discover it. The star first appeared on plates taken by Harvard University in 1888 and 1898, but in 1916, Barnard …

Despite its “beta” designation, Beta Librae is the brightest star in the constellation Libra, with an apparent magnitude of +2.6. However, the debate about its true brightness dates back to antiquity; Eratosthenes (276-194 BC) was …

Castor, also known as Alpha Geminorum, is the second-brightest star in the constellation Gemini. Although it appears as a single white point of light beside Pollux, Castor is actually an extraordinary system of six stars …

Look up at the stars tonight, then look again at the same time tomorrow night, and they’ll appear to be in almost exactly the same places. But come back six months from now, at that …

Acrux (Alpha Crucis) is the brightest star in the constellation Crux, the 13th most luminous star in the entire night sky, and also the southernmost of all first-magnitude stars. However, Acrux is actually a multiple …

Mimosa (Beta Crucis) is the second most luminous star in the Southern Cross asterism that defines the constellation Crux, and the 20th most luminous star in the entire night sky. It is also a spectroscopic …

Fomalhaut, whose name means “mouth of the fish,” is the brightest star in the constellation Piscis Austrinus and the 18th-brightest star in the night sky. Located just 25 light-years from Earth, it is a young …

Deneb is the brilliant white star marking the tail of Cygnus the Swan. It forms one corner of the Summer Triangle and is one of the brightest stars in the night sky despite lying thousands …

Hadar (Beta Centauri) is a triple star system whose combined visual magnitude of +0.61 makes it the second-most luminous star in constellation of Centaurus, and the 11th most luminous stars in the entire sky. It …