Addition information to look up the star yourself in the night sky.
Stars Peg (Markab), β Peg, and γ Peg, together with α Andromedae (Alpheratz or Sirrah) form the large asterism known as the Square of Pegasus. 51 Pegasi, a star in this constellation, is the first Sun-like star known to have an extrasolar planet. IK Pegasi is the nearest supernova candidate. Spectroscopic analysis of HD 209458 b, an extrasolar planet in this constellation has provided the first evidence of atmospheric water vapor beyond the solar system, while extrasolar planets orbiting the star HR 8799 also in Pegasus are the first to be directly imaged.
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