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Such eccentricity is sufficient for Mercury to receive twice as much solar irradiation at perihelion compared to aphelion. Before its demotion from planet status in 2006, Pluto was considered to be the planet with the most eccentric orbit (e = 0.248). Other Trans-Neptunian objects have significant eccentricity, notably the dwarf planet Eris (0.44).
The eccentricity of Mercury's orbit makes this resonance stable—at perihelion, when the solar tide is strongest, the Sun is nearly stationary in Mercury's sky. [ 130 ] The 3:2 resonant tidal locking is stabilized by the variance of the tidal force along Mercury's eccentric orbit, acting on a permanent dipole component of Mercury's mass ...
This is due to the high eccentricity of Mercury's orbit around the Sun. [1] A 19th century depiction of the apparent size of the Sun as seen from the Solar System's planets (incl. 72 Feronia and the then most outlying known asteroid, here called Maximiliana and now called 65 Cybele).
In the case of Mercury, half of the greater axis is about 5.79 × 10 10 m, the eccentricity of its orbit is 0.206 and the period of revolution 87.97 days or 7.6 × 10 6 s. From these and the speed of light (which is ~ 3 × 10 8 m/s ), it can be calculated that the apsidal precession during one period of revolution is ε = 5.028 × 10 −7 ...
Numerical simulations have suggested that the eventual formation of a perihelion secular resonance between Mercury and Jupiter (g 1 = g 5) has the potential to greatly increase Mercury's eccentricity and possibly destabilize the inner Solar System several billion years from now. [23] [24]
Although the eccentricity is 1, this is not a parabolic orbit. Radial parabolic orbit: An open parabolic orbit where the object is moving at the escape velocity. Radial hyperbolic orbit: An open hyperbolic orbit where the object is moving at greater than the escape velocity. This is a hyperbolic orbit with semi-minor axis = 0 and eccentricity = 1.
The eccentricity of an orbit is a measure of how elliptical (elongated) it is. All the planets of the Solar System except for Mercury have near-circular orbits (e<0.1). [8] Most exoplanets with orbital periods of 20 days or less have near-circular orbits, i.e. very low eccentricity.
A Mercury crosser or Mercury grazer is an asteroid whose orbit crosses that of Mercury. ... Eccentricity Absolute magnitude (H) Orbit class Notes 16960 1998 QS 52: 0 ...