YBP 1194
YBP 1194 is a G-type main-sequence star, class G5V, in the open cluster M67 in the constellation Cancer. It is the best solar twin found to date, having the near exact temperature and mass as the Sun. YBP 1194 has a higher metallicity than the Sun and is 0.5 billion years younger at an age of 4.2 billion years old, but due to the distance, the error bar is high at ±1.6 billion years. On December 19, 2013, it was announced to have an extrasolar planet with a period of 6.9 days and a high eccentricity of 0.24 with a mass of 0.34 MJ. It is about 2,772 light-years (850 parsecs) from the Sun. It is packed in a small cluster, Messier 67, with a radius of 10 ly, with over 500 other stars. For comparison, the Sun has 17 stars at a distance of 10 ly and about 134 stars at a distance of 20 ly.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cancer |
| Right ascension | 08h 51m 00.807s |
| Declination | +11° 48′ 52.76″ |
| Apparent magnitude (V) | 14.676 |
| Characteristics | |
| Spectral type | G5V |
| B−V color index | 0.626 |
| Astrometry | |
| Radial velocity (Rv) | +36.5 ± 0.9 km/s |
| Proper motion (μ) | RA: -7.3 mas/yr Dec.: -4.3 mas/yr |
| Parallax (π) | 1.1164 ± 0.0369 mas |
| Distance | 2,920 ± 100 ly (900 ± 30 pc) |
| Details | |
| Mass | 1.01 ± 0.02 M☉ |
| Radius | 0.99 ± 0.02 R☉ |
| Surface gravity (log g) | 4.44 ± 0.035 cgs |
| Temperature | 5780 ± 27 K |
| Metallicity | 0.023 ± 0.015 |
| Age | 4.2 ± 1.6 Gyr |
| Other designations | |
NGC 2682 YBP 1194, ES 4063, ES IV-63, FBC 2867, MMJ 5357, SAND 770, 2MASS J08510080+1148527, Gaia DR2 604914949295282816 | |
| Database references | |
| SIMBAD | data |