Recently, researchers have studied quite bizarre planetary system in which the exoplanet HAT-P-7b is moving in the opposite direction of its orbit around its star. The central star of this planetary system is located at a distance of 1.040 light-years from Earth in the constellation Cygnus.
Planet HAT-P-7 was found March 6, 2008. The orbit of the planet is close to the star HAT-P-7, the major axis of the orbit is slightly more than 5 million miles, and its orbital period is two days. The planet belongs to a rare class of short hot Jupiters. The planet's mass is 1.776 Jupiter masses, diameter — 1.363 diameter of Jupiter. This planet is extremely hot with daytime temperatures of about 2500 ° C, it is 45% of the surface temperature of the Sun, and therefore this exoplanet can be considered one of the hottest currently known exoplanets. The parent star of the planet has a spectral class F8. With the naked eye, this star is not visible. Declination star = 47 degrees, and the right ascension = 19 h 28 min.
Density of the planet is quite large: it is 930 kg/m3.
Now the study of the planetary system, Japanese scientists discovered another planet and called it the HAT-P-7c. Helped them in the Subaru telescope in Hawaii. Scientists suggest that this planet can be blamed for the strange orbit exoplanets HAT-P-7b.
At the time when all the planets in our solar system revolve around the Sun in the same direction, in the planetary system HAT-P-7, all is not so. Most likely, the newly confirmed planet HAT-P-7c makes the planet HAT-P-7b move in a retrograde orbit.