| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 19h 28m 59.3539s[1] |
| Declination | +47° 58′ 10.217″[1] |
| Apparent magnitude (V) | 10.46[2] |
| Characteristics | |
| Spectral type | F6V[3] |
| Apparent magnitude (B) | ~10.90[2] |
| Apparent magnitude (V) | ~10.46[2] |
| Apparent magnitude (J) | 9.555 ± 0.030[2] |
| Apparent magnitude (H) | 9.344 ± 0.029[2] |
| Apparent magnitude (K) | 9.334 ± 0.018[2] |
| Variable type | planetary transit[4] |
| Astrometry | |
| Proper motion (μ) | RA: −18.325(14)mas/yr[1] Dec.: 8.851(14)mas/yr[1] |
| Parallax (π) | 2.9991±0.0114 mas[1] |
| Distance | 1,088 ± 4 ly (333 ± 1 pc) |
| Details | |
| Mass | 1.47+0.8 −0.5 M☉ |
| Radius | 1.84+0.23 −0.11 R☉ |
| Surface gravity (log g) | 4.02 ± 0.01[5] cgs |
| Temperature | 6441 ± 69[5] K |
| Metallicity [Fe/H] | 0.15 ± 0.08[5] dex |
| Rotational velocity (v sin i) | 5.0 ± 1.2[5] km/s |
| Other designations | |
| BD+47°2846,KOI-2,KIC 10666592,TYC 3547-1402-1,GSC 03547-01402,2MASS J19285935+4758102[2] | |
| Database references | |
| SIMBAD | data |
HAT-P-7 is aF-type main sequence star located about 1088light-years away in theconstellationCygnus. Theapparent magnitude of this star is 10.5, which means it is not visible to thenaked eye but can be seen with a smalltelescope on a clear dark night.[2]
This star has only one known planet,HAT-P-7b. This star system was within the initialfield of view of theKepler planet-hunting spacecraft[4] and was given the designation KOI-2 and later Kepler-2.
| Companion (in order from star) | Mass | Semimajor axis (AU) | Orbital period (days) | Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 1.806±0.036 MJ | 0.03813±0.00036 | 2.20473539167±0.00000001654[9] | <0.0040 | — | 1.64±0.11 RJ |
