Alterf
λ (lambda) Leonis, a star of spectral type K5 with a magnitude of approximately 4.5. The Arabic-derived name means "the Glance of the Lion". It lies approximately 335 light years from Earth. The coordinates are:
Right ascension: 09h 31min 43.240s | Declination: +22° 58' 05.036"
Alterf was formerly a yellow giant of type K1 which became dangerously unstable approximately twenty-four thousand years ago, due to an unexpected in-system incursion by a black hole too large to be diverted. The graze pulled a dangerously large quantity of matter out of Alterf in passing, and the star could not afterwards be stabilized at anything like its previous energy levels. When Alterf's luminosity and other energy output subsequently dropped off sharply, the star's inhabited planets had to be evacuated and their inhabitants and technologies eventually rafted to other solar systems in nearby space, especially the volumes of space adjacent to Rirhath B.
Alterf subsided into its present state approximately a year and a half after the rafting was completed. The primary's planets (such as Alterf IV) and moons (such as Alterf IVa) remain, though they are now desolate of all but the hardiest of their life forms. (AWOM)