Binary star system in the Pegasus constellation
78 Pegasi is abinary star system in the northernconstellation ofPegasus . It is visible to the naked eye as a faint, orange-hued point of light with anapparent visual magnitude of 4.93.[ 2] light years from the Sun based onparallax ,[ 1] radial velocity of −8 km/s.[ 6] A. G. Clark in 1862. The components of this system orbit each other over a 630-yearperiod with aneccentricity of 0.11.[ 10]
The primary member, designated component A, is a magnitude 5.07[ 3] giant star with astellar classification of K0III,[ 4] core and expanded to 10[ 7] Sun's radius . It is ared clump giant,[ 11] horizontal branch and is generating energy through corehelium fusion . It has 1.5[ 7] mass of the Sun and is radiating 57[ 2] Sun's luminosity from its enlargedphotosphere at aneffective temperature of 4,898 K.[ 7] [ 3]
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