WASP-47
WASP-47 is a star similar in size and brightness to the Sun about 870 light-years away in the constellation Aquarius. It lies within the Kepler K2 campaign field 3. It was first noticed to have a hot Jupiter exoplanet orbiting every 4 days in 2012 by the Wide Angle Search for Planets (WASP) team. While it was thought to be a typical hot Jupiter system, three more planets were found in 2015: an outer gas giant within the habitable zone, a hot Neptune exterior to the hot Jupiter's orbit and a super-Earth interior to the hot Jupiter's orbit. WASP-47 is the only planetary system known to have both planets near the hot Jupiter and another planet much further out.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 22h 04m 48.7262s |
| Declination | −12° 01′ 08.001″ |
| Apparent magnitude (V) | 11.986 |
| Characteristics | |
| Evolutionary stage | Main sequence |
| Spectral type | G9V |
| Astrometry | |
| Proper motion (μ) | RA: 15.023±0.090 mas/yr Dec.: −41.309±0.092 mas/yr |
| Parallax (π) | 3.7496 ± 0.0679 mas |
| Distance | 870 ± 20 ly (267 ± 5 pc) |
| Details | |
| Mass | 1.11 (± 0.05) M☉ |
| Radius | 1.16 (± 0.26) R☉ |
| Luminosity | ~1.16 L☉ |
| Surface gravity (log g) | 4.354 (± 0.086) cgs |
| Temperature | 5576 (± 68) K |
| Metallicity [Fe/H] | +0.36 (± 0.05) dex |
| Rotation | 32.5±3.9 d |
| Age | 6.5 +2.6 −1.2 Gyr |
| Other designations | |
1SWASP J220448.72-120107.8, EPIC 206103150, WISE J220448.74-120108.4, K2-23, 2MASS J22044873-1201079 | |
| Database references | |
| SIMBAD | data |
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