| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Cygnus |
| Right ascension | 19h 28m 59.3616s[1] |
| Declination | +47° 58′ 10.264″[1] |
| Apparent magnitude (V) | 10.46[1] |
| Characteristics | |
| Spectral type | F8[1] |
| Apparent magnitude (B) | ~10.90[1] |
| Apparent magnitude (V) | ~10.46[1] |
| Apparent magnitude (J) | 9.555 ±0.030[1] |
| Apparent magnitude (H) | 9.344 ±0.029[1] |
| Apparent magnitude (K) | 9.334 ±0.018[1] |
| Astrometry | |
| Proper motion (μ) | RA: -13.40[1] mas/yr Dec.: 12.90[1] mas/yr |
| Distance | 1044 (−130+163) ly (320 (−40+50) pc) |
| Details | |
| Mass | 1.47 (−0.5 +0.8) M☉ |
| Radius | 1.84 (−0.11 +0.23) R☉ |
| Temperature | 6350 ±80 K |
| Metallicity | 0.26 ±0.08 |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Extrasolar Planets Encyclopaedia |
data |
HAT-P-7 is a yellow white dwarf star located about 1044 light-years away in the constellation Cygnus. The apparent magnitude of this star is 10.5, which means it is not visible to the naked eye but can be seen with a small telescope on a clear dark night.[1]
Contents |
This star has one known planet, the extrasolar planet HAT-P-7b. This star system is within the field of view of the now-operational Kepler Mission planet-hunter spacecraft.[2]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity |
|---|---|---|---|---|
| b | 1.776 +0.077 −0.049 MJ |
0.0377 ± 0.0005 | 2.2047299 ± (4×10-6) | 0 |