WASP-7
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]
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 |
Characteristics | |
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] |
Astrometry | |
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 |
Distance | 520 ± 20 ly (158 ± 6 pc) |
Details | |
Mass | 1.28 −0.19+0.09 M☉ |
Radius | 1.236 −0.046+0.059 R☉ |
Temperature | 6400 ± 100 K |
Metallicity | 0 ± 0.1 |
Other designations | |
Database references | |
SIMBAD | data |
Extrasolar Planets Encyclopaedia | 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 dense planet with Jupiter's mass orbiting very close to a hot star and thus emitting enough heat to shine.[3]
Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
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
- SuperWASP
- List of extrasolar planets
References
- 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. S2CID 1828208.Gaia Data Release 1 catalog entry
- "SIMBAD query result: HD 197286 -- Star". Centre de Données astronomiques de Strasbourg. Retrieved 2009-05-06.
- 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. S2CID 15962609.
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