Astronomy:WASP-7
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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 |
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
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+0.12−0.18 MJ | 0.0618+0.0014−0.0033 | 4.954658+0.000055−0.000043 | 0.0173+0.0009−0.0011[4] | — | — |
See also
- SuperWASP
- List of extrasolar planets
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A et al. (2016). "Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties". Astronomy and Astrophysics 595: A2. doi:10.1051/0004-6361/201629512. Bibcode: 2016A&A...595A...2G. https://www.aanda.org/articles/aa/full_html/2016/11/aa29512-16/aa29512-16.html.Gaia Data Release 1 catalog entry
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 "SIMBAD query result: HD 197286 -- Star". Centre de Données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-id?Ident=WASP-7. 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. doi:10.1088/0004-637X/690/1/L89. Bibcode: 2009ApJ...690L..89H.
- ↑ Wallack, Nicole L.; Knutson, Heather A.; Deming, Drake (2021), "Trends in Spitzer Secondary Eclipses", The Astronomical Journal 162 (1): 36, doi:10.3847/1538-3881/abdbb2, Bibcode: 2021AJ....162...36W
External links
- "WASP-7". Exoplanets. http://media4.obspm.fr/exoplanets/base/etoile.php?nom=WASP-7. Retrieved 2009-05-06.
Coordinates: 
20h 44m 10.2190s, −39° 13′ 30.894″
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