17_Delphini
17 Delphini
Suspected variable star in Delphinus
17 Delphini is a solitary[11] star in the equatorial constellation Delphinus. It has an absolute magnitude of −0.64[7] and apparent magnitude of 5.18,[2] allowing it to be faintly seen with the naked eye. Located 517 light years away,[1] it is approaching the Solar System with a heliocentric radial velocity of −10.2 km/s.[6]
17 Delphini is an orange giant that is most likely on the horizontal branch (84% probability).[8] At present it has 2.33 times the mass of the Sun, but at an age of 832 million years — has expanded to 23.36 times the radius of the Sun.[8] It shines at 219 solar luminosities from its enlarged photosphere at an effective temperature of 4,616 K,[8] giving it an orange glow. 17 Del has an iron abundance 64% that of the Sun[9] and spins modestly with a projected rotational velocity of 3 km/s.[10]
17 Del is suspected to be a variable star of unknown type ranging from 5.16 to 5.27.[3]