WASP-7

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]

WASP-7

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
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]

The WASP-7 planetary system^[4]

Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
WASP-7b	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

See also

• SuperWASP
• List of extrasolar planets