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Observation data
Epoch J2000      Equinox J2000
Constellation Microscopium
Right ascension 20h 44m 10.2208s[1]
Declination −39° 13′ 30.850″[1]
Apparent magnitude (V) 9.51
Spectral type F5V[2]
Apparent magnitude (B) ~9.96[2]
Apparent magnitude (V) ~9.54[2]
Apparent magnitude (J) 8.648 ± 0.027[2]
Apparent magnitude (H) 8.414 ± 0.042[2]
Apparent magnitude (K) 8.396 ± 0.023[2]
Proper motion (μ) RA: 30.480±0.677[1] mas/yr
Dec.: 57.998±0.753[1] mas/yr
Parallax (π)6.32 ± 0.25[1] mas
Distance520 ± 20 ly
(158 ± 6 pc)
Mass1.28 −0.19+0.09 M
Radius1.236 −0.046+0.059 R
Temperature6400 ± 100 K
Metallicity0 ± 0.1
Other designations
HD 197286, CPD-39 8759, PPM 300547, CD-39 13941, GSC 07963-01570, TYC 7963-1570-1, CPC 18 10732, 2MASS J20441022-3913309[2]
Database references
Extrasolar Planets

WASP-7, also identified as HD 197286, is a type F star located about 520 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 the star cannot be seen by the naked eye but is visible through a small telescope.[2]

Planetary system[edit]

The SuperWASP project announced an extrasolar planet, WASP-7b, orbiting this star in 2008. The planet appears to be another hot Jupiter, a dense planet with Jupiter's mass orbiting very close to a hot star and thus emitting enough heat to shine.[3]

The WASP-7 planetary system
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
WASP-7b 0.96 −0.18+0.12 MJ 0.0618 −0.0033+0.0014 4.954658 −4.3e-05+5.5e-05 0

See also[edit]


  1. ^ a b c d e Brown, A. G. A; et al. (2016). "Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties". Astronomy and Astrophysics. 595. A2. arXiv:1609.04172. Bibcode:2016A&A...595A...2G. doi:10.1051/0004-6361/201629512.Gaia Data Release 1 catalog entry
  2. ^ a b c d e f g h "SIMBAD query result: HD 197286 -- Star". Centre de Données astronomiques de Strasbourg. Retrieved 2009-05-06.
  3. ^ Hellier, Coel; Anderson, D. R.; Gillon, M.; Lister, T. A.; Maxted, P. F. L.; Queloz, D.; Smalley, B.; Triaud, A. H. M. J.; et al. (2008). "Wasp-7: A Bright Transiting-Exoplanet System in the Southern Hemisphere". The Astrophysical Journal Letters. 690 (1): L89–L91. arXiv:0805.2600. Bibcode:2009ApJ...690L..89H. doi:10.1088/0004-637X/690/1/L89.

External links[edit]

  • "WASP-7". Exoplanets. Retrieved 2009-05-06.

Coordinates: Sky map 20h 44m 10.2190s, −39° 13′ 30.894″