Souradeep Essay

771 WordsSep 15, 20134 Pages
Parent star Star -Kepler-22 ; Constellation -Cygnus ; Right ascension:- (α) 19h 16m 52.2s ;Declination:- (δ) +47° 53′ 4.0″; Apparent magnitude:-(mV) 11.5 (B-band) ; Distance:-620 ly& (190 pc) Spectral type:-G5V ; Mass :- (m)0.97 M☉; Radius:-(r)0.98 R☉ ; Temperature:-(T)5518 ± 44 K; Orbital elements Semi major axis:-(a)0.85 AU(127 Gm); Orbital period:-(P)289.9 declination(i)89.764 +0.042−0.025 . Physical characteristics:- Mass:-(m)< 0.11 MJ; Radius:-(r)2.4 R⊕ ;Stellar flux:-(E)1.09 ⊕;Temperature:-(T)262 [5] K. Discovery information:- Discovery date:-12 May 2009 (first observed) 5 December 2011 (announced); Discoverer(s):- Kepler Science Team; Discovery:-Transit Discovery; site:-Kepler telescope; Discovery status:-Published. Orbit The only parameters of the planet's orbit that are currently available are its period, which is about 290 days, and its inclination, which is approximately 90°, so that it transits the disk of its star as seen from Earth. No information is available about the shape of the planet's orbit. Many extra solar planets are known to move in highly elliptical orbits. It is only known that its average orbital distance is within its host star's habitable zone. If Kepler-22b has a highly elongated orbit it may well only spend a small fraction of its time within this habitable zone, which would cause extreme temperature differences on the planet and might make it inhospitable. In order to obtain information about the shape of the planet's orbit, other methods of planetary detection, such as the radial velocity method, need to be used. While such methods have been performed on the planet after its discovery, they have not yet detected what the orbital eccentricity of the planet actually is, and have as of March 2012 only set an upper limit on the mass of the planet. Physical characteristics .Kepler-22b's radius is roughly 2.4 times

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