Pr0211
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Cancer |
Right ascension | 08h 42m 11.49887s |
Declination | +19° 16′ 37.2375″ |
Apparent magnitude (V) | 12.143 |
Characteristics | |
Evolutionary stage | Main sequence |
Spectral type | K1V or late G |
Apparent magnitude (G) | 11.926±0.003 |
Apparent magnitude (J) | 10.660±0.022 |
Apparent magnitude (H) | 10.242±0.019 |
Apparent magnitude (K) | 10.173±0.016 |
Astrometry | |
Radial velocity (Rv) | 35.37±0.42 km/s |
Proper motion (μ) | RA: -36.820 mas/yr Dec.: -12.384 mas/yr |
Parallax (π) | 5.4387 ± 0.0184 mas |
Distance | 600 ± 2 ly (183.9 ± 0.6 pc) |
Details | |
Mass | 0.935±0.013 M☉ |
Radius | 0.827±0.012 R☉ |
Surface gravity (log g) | 4.51±0.05 cgs |
Temperature | 5300±30 K |
Metallicity [Fe/H] | 0.18±0.02 dex |
Rotation | 7.97 days |
Rotational velocity (v sin i) | 5.1±0.3 km/s |
Age | 578±12 or 790±30 Myr |
Other designations | |
Database references | |
SIMBAD | data |
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 76°±11° 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 metres (4.9 ft; 1.6 yd) 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 metres (12 ft; 3.9 yd) Italian Telescopio Nazionale Galileo (TNG) in La Palma, and the Tillinghast Reflector Echelle Spectrograph (TRES) mounted at the 1.5 metres (4.9 ft; 1.6 yd) telescope at the University of Georgia in the United States.
Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | ≥1.88±0.03 MJ | 0.03176±0.00015 | 2.14610±0.00003 | 0.011+0.012 −0.008 |
— | — |
c | ≥7.79±0.33 MJ | 5.5+3.0 −1.4 |
4850+4560 −1750 |
0.71±0.11 | — | — |