sedna and venus are the two major planets of our solar system that have the most eccentric orbits.
sedna and venus are the two major planets of our solar system that have the most eccentric orbits.
which two major planets of our solar system have the most eccentric orbits?
sedna
as captured planets would have initially eccentric orbits dormand and woolfson in 1974 and 1977 and woolfson proposed the possibility of a collision. a filament is thrown out by a passing proto-star which is captured by the sun and planets form from it. in this there were 6 original planets, corresponding to 6 point-masses in the filament, with planets a and b, the 2 innermost, colliding, the former at twice the mass of neptune, and ejecting out of the solar system, and the latter at 1/3 the mass of uranus, and splitting into earth and venus. mars and the moon are former moons of a. mercury is either a fragment of b or an escaped moon of a. the collision also produced the asteroid belt and the comets.
history of solar system formation and evolution hypotheses
long-period comets have highly eccentric orbits and periods ranging from 200 years to thousands of years. an eccentricity greater than 1 when near perihelion does not necessarily mean that a comet will leave the solar system. for example, comet mcnaught had a heliocentric osculating eccentricity of 1.000019 near its perihelion passage epoch in january 2007 but is bound to the sun with roughly a 92,600-year orbit because the eccentricity drops below 1 as it moves farther from the sun. the future orbit of a long-period comet is properly obtained when the osculating orbit is computed at an epoch after leaving the planetary region and is calculated with respect to the center of mass of the solar system. by definition long-period comets remain gravitationally bound to the sun; those comets that are ejected from the solar system due to close passes by major planets are no longer properly considered as having "periods". the orbits of long-period comets take them far beyond the outer planets at aphelia, and the plane of their orbits need not lie near the ecliptic. long-period comets such as comet west and c/1999 f1 can have aphelion distances of nearly 70,000 au with orbital periods estimated around 6 million years.
comet