Theta Delphini [SEP] constellation
Theta Delphini
Theta Delphini (θ Del, θ Delphini) is a star in the constellation Delphinus. It has an apparent magnitude of about 5.7, meaning that it is just barely visible to the naked eye under excellent viewing conditions. Based upon parallax measurements made by the Hipparcos spacecraft, this star is around 1300 light years away from the Sun.
Theta Delphini's spectral type is K3Ib, meaning it is a K-type supergiant. These types of stars form when relatively massive (10 to ) stars like B
Theta Gruis
Theta Gruis, Latinized from θ Gruis, is a triple star system in the southern constellation of Grus. Its combined apparent visual magnitude is 4.28, which is bright enough to be seen with the naked eye. The system contains a magnetic Delta Delphini-like F5 star with a close fainter companion, plus a more distant G2 main sequence star.