WASP-7
| 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 mas[1] |
| 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 |
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]
| 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
[edit]References
[edit]- ^ 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. S2CID 1828208.Gaia Data Release 1 catalog entry
- ^ a b c d e f g h "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.
- ^ Wallack, Nicole L.; Knutson, Heather A.; Deming, Drake (2021), "Trends in Spitzer Secondary Eclipses", The Astronomical Journal, 162 (1): 36, arXiv:2103.15833, Bibcode:2021AJ....162...36W, doi:10.3847/1538-3881/abdbb2, S2CID 232417602
External links
[edit]- "WASP-7". Exoplanets. Archived from the original on 2016-03-03. Retrieved 2009-05-06.
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