Algieba (Gamma Leonis)
The third brightest star in the constellation Leo.
Algieba is a magnificent binary system
with orange-red and yellow components visible through a modest telescope
under good atmospheric conditions; its Arabic name means "the forehead".
The brighter component (magnitude 2.6) is a giant K
star with a surface temperature of 4,400 K and a luminosity of 180 Lsun;
its partner is a magnitude 3.8 giant G star
with a temperature of 4,900 K and a luminosity of 50 Lsun. The
angular separation of just over 4" means that the two stars are at least
170 AU apart – four times the Pluto-Sun
distance – and have an orbital period of over 500 years.
| Gamma Leonis
Photo credit: Rainer Anton
||K0III + G7III
||126 light-years (39 pc)
||R.A. 10h 19m 58.3s,
Dec. +19° 50' 30"
||41 Leo, BD +20°2467, HD 89484,
LTT 12764/12765, GCTP 2423.00,
SAO 81298, ADS 7724, HIP 50583