HAT-P-7b
| Extrasolar planet | List of extrasolar planets | |
|---|---|---|
 |
||
| Parent star | ||
| Star | GSC 03547-01402 | |
| Constellation | Cygnus | |
| Right ascension | (α) | 19h 28m 59s |
| Declination | (δ) | +47° 58′ 10″ |
| Distance | 1044+163 −130 ly (320+50 −40 pc) |
|
| Spectral type | F8 | |
| Orbital elements | ||
| Semimajor axis | (a) | 0.0377 ± 0.0005 AU |
| Eccentricity | (e) | 0 |
| Orbital period | (P) | 2.2047299 (± 4×10−6) d |
| Inclination | (i) | 85.7+3.5 −3.1° |
| Time of transit | (Tt) | 2453790.2593±0.001 JD |
| Physical characteristics | ||
| Mass | (m) | 1.776+0.077 −0.049 MJ |
| Radius | (r) | 1.363+0.195 −0.087 RJ |
| Density | (ρ) | 930 kg m-3 |
| Surface gravity | (g) | 24.75 m/s² (2.524 g) |
| Temperature | (T) | 2730+150 −100 K |
| Discovery information | ||
| Discovery date | March 6, 2008 | |
| Discoverer(s) | HATNet Project | |
| Detection method | Transit | |
| Discovery status | Published | |
| Database references | ||
| Extrasolar Planets Encyclopaedia |
data | |
| SIMBAD | data | |
HAT-P-7b (or Kepler-2b) is an extrasolar planet discovered in 2008. It orbits very close to its parent star GSC 03547-01402, and is both larger and more massive than Jupiter. Due to the extreme heat it receives from its star, the dayside temperature is predicted to be 2730+150
−100 K. The GSC 03547-01402 system is within the field of view of the now operational Kepler Mission spacecraft,[1] which confirmed the transit and orbital properties of the planet with significantly improved confidence and observed occultation and light curve characteristics consistent with a strongly absorbing atmosphere with limited advection to the night side. In testing itself on HAT-P-7b, Kepler proved it was sensitive enough to detect Earth-like planets.[2]
In August 2009, it was announced that HAT-P-7b may have a retrograde orbit, based upon measurements of the Rossiter-McLaughlin effect.[3][4][5] This announcement came only a day after the announcement of the first planet discovered with such an orbit, WASP-17b.
On July 4, 2011, HAT-P-7b was the subject of the Hubble Space Telescope's one millionth science observation.[6]
[edit] See also
[edit] References
- ^ Pal et al.; Bakos, G. Á.; Torres, G.; Noyes, R. W.; Latham, D. W.; Kovács, Géza; Marcy, G. W.; Fischer, D. A. et al. (2008). "HAT-P-7b: An Extremely Hot Massive Planet Transiting a Bright Star in the Kepler Field". The Astrophysical Journal 680 (2): 1450–1456. arXiv:0803.0746. Bibcode 2008ApJ...680.1450P. doi:10.1086/588010.
- ^ Borucki, W.J.; D. Koch,1 J. Jenkins, D. Sasselov, R. Gilliland, N. Batalha, D. W. Latham,3 D. Caldwell, G. Basri, T. Brown,7 J. Christensen-Dalsgaard, W. D. Cochran, E. DeVore, E. Dunham, A. K. Dupree, T. Gautier, J. Geary, A. Gould, S. Howell, H. Kjeldsen, J. Lissauer, G. Marcy, S. Meibom, D. Morrison, J. Tarter (2009-08-07). "Kepler’s Optical Phase Curve of the Exoplanet HAT-P-7b". Science 325 (5941): 709. Bibcode 2009Sci...325..709B. doi:10.1126/science.1178312. PMID 19661420. http://www.sciencemag.org/cgi/content/full/sci;325/5941/709. Retrieved 2009-08-07.
- ^ Second backwards planet found, a day after the first
- ^ HAT-P-7: A Retrograde or Polar Orbit, and a Second Planet
- ^ First Evidence of a Retrograde Orbit of Transiting Exoplanet HAT-P-7b
- ^ NASA'S Hubble Makes One Millionth Science Observation
[edit] External links
Media related to HAT-P-7b at Wikimedia Commons
- HAT-P-7b light curve using differential photometry
- Kepler Shows Exoplanet Is Unlike Anything in Our Solar System
- "HAT-P-7 b". Exoplanets. http://media4.obspm.fr/exoplanets/base/planete.php?etoile=HAT-P-7&planete=b. Retrieved 2010-01-20.
Coordinates: 
19h 28m 59s, +47° 58′ 10″
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