The star Alpha Leonis, magnitude 1.36, the faintest of the first-magnitude stars. It is a B7 (i.e. blue-white) dwarf 77 light years away and has a wide companion of magnitude 7.7.
Adapted from the entry by Ian Ridpath in the Oxford Dictionary of Astronomy.
Below: Regulus in Leo, from Norton’s Star Atlas, 20th edition.
© Pearson Education and Charles Nix