WASP-7
Star in the constellation Microscopium
From Wikipedia, the free encyclopedia
WASP-7, also identified as HD 197286, is a type F star located about 527 light-years away in the constellation Microscopium. This star is a little larger and about 28% more massive than the Sun and is also brighter and hotter. At magnitude 9.5 the star cannot be seen by the naked eye but is visible through a small telescope.[3]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Microscopium[1] |
| Right ascension | 20h 44m 10.2208s[2] |
| Declination | −39° 13′ 30.856″[2] |
| Apparent magnitude (V) | 9.50[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | F5V[3] |
| Apparent magnitude (B) | ~9.96[3] |
| Apparent magnitude (V) | ~9.54[3] |
| Apparent magnitude (J) | 8.648 ± 0.027[3] |
| Apparent magnitude (H) | 8.414 ± 0.042[3] |
| Apparent magnitude (K) | 8.396 ± 0.023[3] |
| Astrometry | |
| Radial velocity (Rv) | −29.09±0.20[2] km/s |
| Proper motion (μ) | RA: 30.394 mas/yr[2] Dec.: −57.587 mas/yr[2] |
| Parallax (π) | 6.1902±0.0176 mas[2] |
| Distance | 527 ± 1 ly (161.5 ± 0.5 pc) |
| Details[4] | |
| Mass | 1.285±0.063 M☉ |
| Radius | 1.466±0.094 R☉ |
| Temperature | 6520±70[5] K |
| Metallicity [Fe/H] | 0.00±0.10 dex |
| Rotational velocity (v sin i) | 17.0±2.0 km/s |
| Age | 2.5+0.8 −0.9 Gyr |
| Other designations | |
| CD−39 13941, CPD−39 8759, HD 197286, PPM 300547, TOI-2197, TIC 389352124, WASP-7, TYC 7963-1570-1, GSC 07963-01570, 2MASS J20441022-3913309, CPC 18 10732[3] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
Planetary system
The SuperWASP project announced an extrasolar planet, WASP-7b, orbiting this star in 2008. The planet appears to be another hot Jupiter, a low-density planet with Jupiter's mass orbiting very close to a hot star and thus emitting enough heat to glow.[6][7]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 1.083+0.093 −0.088 MJ |
0.06188+0.00098 −0.0010 |
4.9546416(35) | <0.049 | 87.03±0.93° | 1.363±0.093 RJ |
