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Motion interpolation of seven images of the HR 8799 system taken from the W. M. Keck Observatory over seven years, featuring four exoplanets. This is a list of extrasolar planets that have been directly observed, sorted by observed separations. This method works best for young planets that emit infrared light and are far from the glare of the star.
English: The diagram illustrates the orbits of Ceres (blue) and several planets (white/grey). The segments of orbits below the ecliptic are plotted in darker colours, and the orange plus sign is the Sun's location. The top left diagram is a polar view that shows the location of Ceres in the gap between Mars and Jupiter.
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Orbits Mercury in yellow; For reference a circular orbit with the same semi-major axis in grey; The orbit plotted in brighter colours above the ecliptic and darker below. Major axis drawn showing perihelion (q) and aphelion (Q) Mercury Positions show every 5 days before and after the perihelion on May 20, 2006
Mercury, the closest planet to the Sun at 0.4 astronomical units (AU), takes 88 days for an orbit, but the smallest known orbits of exoplanets have orbital periods of only a few hours, see Ultra-short period planet. The Kepler-11 system has five of its planets in smaller orbits than Mercury's.
This template is used to create the ==See also== section at the bottom of each minor planet list page. It also adds a " back to top " link to make the table of contents navigation bar more accessible.
They have highly eccentric orbits, generally a perihelion within the orbits of the inner planets and an aphelion far beyond Pluto. When a comet enters the inner Solar System, its proximity to the Sun causes its icy surface to sublimate and ionise , creating a coma : a long tail of gas and dust often visible to the naked eye.
The planet orbits a star named Kepler-62, orbited by a total of five planets. [1] The star has a mass of 0.69 M ☉ and a radius of 0.64 R ☉. It has a temperature of 4,925 K (4,652 °C; 8,405 °F) and is 7 billion years old. [1] In comparison, the Sun is 4.6 billion years old [6] and has a temperature of 5,778 K (5,505 °C; 9,941 °F). [7]