Magnitude 5.71 | Constellation Delphinus | |
 | ||
People also search for Eta Delphini, Iota Delphini, Zeta 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.
Iota Delphini's spectral type is K3Ib, meaning it is an K-type supergiant. These types of stars form when relatively massive (10 to 30 M☉) stars like B-type main sequence stars run out of hydrogen to fuse and start cooling down.
References
Theta Delphini Wikipedia(Text) CC BY-SA