Pr0211

Pr0211 (sometimes written Pr 0211, also 2MASS J08421149+1916373) is a Sun-like late G or early K-type main-sequence star in the Beehive Cluster, or Praesepe, located 600 light-years away in the constellation Cancer. It is rotationally variable and has a rotation period of 7.97 days, with its spin axis at an inclination of $11.926$ to the plane of the sky. Pr0211 hosts two known exoplanets, and was the first multi-planet system to be discovered in an open cluster.

Pr0211 forms a binary star system with a K-type main-sequence star known as NGC 2632 JC 280 or 2MASS J08421285+1916040.

Planetary system
Pr0211 b is a gas giant exoplanet, specifically a hot Jupiter, orbiting around Pr0211. Pr0211 b along with Pr0201 b are notable for being the first exoplanets discovered in the Beehive Cluster. Pr0211 b and Pr0201 b were discovered in 2012 by Sam Quinn and his colleagues while observing 53 stars in the Beehive Cluster using the 1.5 m telescope at the University of Georgia in the United States.

Pr0211 c is a gas giant exoplanet orbiting around Pr0211. Pr0211 c was discovered in 2016 by Luca Malavolta and his colleagues while observing its host star with the HARPS-N spectrograph on the 3.6 m Italian Telescopio Nazionale Galileo (TNG) in La Palma, and the Tillinghast Reflector Echelle Spectrograph (TRES) mounted at the 1.5 m telescope at the University of Georgia in the United States.