Kepler-4 b
Description: Kepler-4b, initially known as KOI 7.01, is an extrasolar planet first detected as a transit by the Kepler spacecraft. Its radius and mass are similar to that of Neptune; however, due to its proximity to its host star, it is substantially hotter than any planet in the Solar System. The planet's discovery was announced on January 4, 2010, in Washington, D.C., along with four other planets that were initially detected by the Kepler spacecraft and subsequently confirmed by telescopes at the W.M. Keck Observatory.
Physical Properties
Mass (Jupiter mass): 0.077 MJ
Radius (Jupiter radius): 0.357 RJ
Density: 1.91 g/cm³
Equilibrium Temperature: 1650.0 K
Orbital Parameters
Orbital Period: 3.21346 days
Semi-major Axis: 0.0456 AU
Eccentricity: Unknown
Inclination: 89.76°
Host Star Properties
Host Star: Kepler-4
Spectral Type: Unknown
Temperature: 5857.0 K
Stellar Mass: 1.22 M☉
Stellar Radius: 1.49 R☉
Discovery Information
Planet Letter: b
Object ID: 3.186
Host ID: 2.42198
Discovery Date: 2010-04
Discovery Year: 2009
Discovery Method: Transit
Discovery Locale: Space
Discovery Facility: Kepler
Discovery Instrument: Kepler CCD Array