WASP-7
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Microscopium[1] |
| Right ascension | 20h 44m 10.2208s[2] |
| Declination | −39° 13′ 30.856″[2] |
| Apparent magnitude (V) | 9.50[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| 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 |
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]
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 low-density planet with Jupiter's mass orbiting very close to a hot star and thus emitting enough heat to glow.[6][7]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination (°) |
Radius |
|---|---|---|---|---|---|---|
| b | 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 |
References
[edit]- ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific. 99 (617): 695. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.
- 1 2 3 4 5 6 7 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- 1 2 3 4 5 6 7 8 9 "SIMBAD query result: HD 197286 -- Star". Centre de Données astronomiques de Strasbourg. Retrieved 2009-05-06.
- 1 2 Bonomo, A. S.; Desidera, S.; et al. (June 2017). "The GAPS Programme with HARPS-N at TNG. XIV. Investigating giant planet migration history via improved eccentricity and mass determination for 231 transiting planets". Astronomy & Astrophysics. 602: A107. arXiv:1704.00373. Bibcode:2017A&A...602A.107B. doi:10.1051/0004-6361/201629882.
- ↑ 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
- ↑ 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.
- ↑ Southworth, J.; Dominik, M.; et al. (March 2011). "A much lower density for the transiting extrasolar planet WASP-7". Astronomy & Astrophysics. 527: A8. arXiv:1012.5181. Bibcode:2011A&A...527A...8S. doi:10.1051/0004-6361/201016183.
External links
[edit]- "WASP-7". Exoplanets. Archived from the original on 2016-03-03. Retrieved 2009-05-06.
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