About HR 3921
HR 3921 is a trash star. It lies about 497.9 light-years from Earth, sits in the constellation Hya, shines at apparent magnitude 6.23 and has spectral type A2/A3III.
Its spectrum reads A2/A3III — an A-type star: white-hot, typically about twice the Sun's mass, and the class most of the sky's famous bright stars belong to.