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