HAT-P-11
HAT-P-11, also designated GSC 03561-02092 and Kepler-3, is an orange dwarf metal rich star about 123 light-years away in the constellation Cygnus. This star is notable for its relatively large rate of proper motion. The magnitude of this star is about 9, which means it is not visible to the naked eye but can be seen with a medium-sized amateur telescope on a clear dark night. The age of this star is about 6.5 billion years.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 19h 50m 50.2473s |
| Declination | +48° 04′ 51.101″ |
| Apparent magnitude (V) | 9.473 9.59 |
| Characteristics | |
| Spectral type | K4 |
| Apparent magnitude (B) | 10.66±0.05 |
| Apparent magnitude (J) | 7.608±0.029 |
| Apparent magnitude (H) | 7.131±0.021 |
| Apparent magnitude (K) | 7.009±0.020 |
| Variable type | planetary transit |
| Astrometry | |
| Proper motion (μ) | RA: 126.095(13) mas/yr Dec.: 232.726(13) mas/yr |
| Parallax (π) | 26.4274 ± 0.0108 mas |
| Distance | 123.42 ± 0.05 ly (37.84 ± 0.02 pc) |
| Absolute magnitude (MV) | 6.57±0.09 |
| Details | |
| Mass | 0.81+0.03 −0.02 M☉ |
| Radius | 0.683±0.009 R☉ |
| Luminosity | 0.26±0.02 L☉ |
| Surface gravity (log g) | 4.59±0.03 cgs |
| Temperature | 4780±50 K |
| Metallicity [Fe/H] | 0.31±0.05 dex |
| Rotational velocity (v sin i) | 1.5±1.5 km/s |
| Age | 6.5+5.9 −4.1 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| KIC | data |
The star has active latitudes that generate starspots. The star appears to have a very small radius, which can be explained by the anomalously high helium fraction.
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