IK Pegasi is a binary star system in the constellation Pegasus, luminous enough to be seen with the unaided eye.
The primary (IK Pegasi A) displays minor pulsations with a periodic cycle of luminosity variation that repeats itself about 23 times per day.
Its companion (IK Pegasi B) is a massive white dwarf—a star that has evolved past generating energy through nuclear fusion.
They orbit each other every 21.7 days with an average separation of about 31 million kilometres, smaller than the orbit of Mercury around the Sun.
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