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The orbital period (also revolution period) is the amount of time a given astronomical object takes to complete one orbit around another object. In astronomy , it usually applies to planets or asteroids orbiting the Sun , moons orbiting planets, exoplanets orbiting other stars , or binary stars .
The accuracy of this calculation requires that the two dates chosen be along the elliptical orbit's minor axis and that the midpoints of each half be along the major axis. As the two dates chosen here are equinoxes, this will be correct when perihelion, the date the Earth is closest to the Sun, falls on a solstice. The current perihelion, near ...
In astronomy, a resonant trans-Neptunian object is a trans-Neptunian object (TNO) in mean-motion orbital resonance with Neptune.The orbital periods of the resonant objects are in a simple integer relations with the period of Neptune, e.g. 1:2, 2:3, etc. Resonant TNOs can be either part of the main Kuiper belt population, or the more distant scattered disc population.
The long orbital period of Neptune means that the seasons last for forty Earth years. [109] Its sidereal rotation period (day) is roughly 16.11 hours. [ 12 ] Because its axial tilt is comparable to Earth's, the variation in the length of its day over the course of its long year is not any more extreme.
Venus rotates retrograde with a sidereal day lasting about 243.0 Earth days, or about 1.08 times its orbital period of 224.7 Earth days; hence by the retrograde formula its solar day is about 116.8 Earth days, and it has about 1.9 solar days per orbital period.
2001 KY 76, also written 2001 KY76, is a trans-Neptunian object from the Kuiper belt.It is classified as a plutino, a minor planet locked in a 2:3 mean-motion orbital resonance with the planet Neptune.
2006 QH 181 orbits the Sun beyond Neptune with an orbital period of 541 years. It has a highly elliptical orbit with a semi-major axis of 66.4 astronomical units (AU) and an orbital eccentricity of 0.42. In its eccentric orbit, 2006 QH 181 comes within 38.8 AU from the Sun at perihelion and 94.0 AU at aphelion.
The transiting planet Kepler-19b shows transit-timing variation with an amplitude of 5 minutes and a period of about 300 days, indicating the presence of a second planet, Kepler-19c, which has a period that is a near-rational multiple of the period of the transiting planet. [8] [9]