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Available online 3 April 2012
In Press, Corrected Proof
Explaining why the uranian satellites have equatorial prograde orbits despite the large planetary obliquity
* A. Morbidelli a,
* K. Tsiganis b,
* K. Batygin c,
* A. Crida a,
* R. Gomes d,
* a Laboratoire Lagrange, UMR7293, Université de Nice Sophia-Antipolis, CNRS, Observatoire de la Côte d’Azur, Boulevard de l’Observatoire, 06304 Nice Cedex 4, France
* b Department of Physics, Section Astrophysics, Astronomy and Mechanics, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
* c California Institute of Technology, Division of Geological & Planetary Sciences, MC 170-25 1200 E. California Blvd., Pasadena, CA 91125, United States
* d Observatório Nacional José Cristino, Rua General José Cristino 77, CEP 20921-400 Rio de Janeiro, RJ, Brazil
* Received 16 November 2011. Revised 23 March 2012. Accepted 27 March 2012. Available online 3 April 2012.
We show that the existence of prograde equatorial satellites is consistent with a collisional tilting scenario for Uranus. In fact, if the planet was surrounded by a proto-satellite disk at the time of the tilting and a massive ring of material was temporarily placed inside the Roche radius of the planet by the collision, the proto-satellite disk would have started to precess incoherently around the equator of the planet, up to a distance greater than that of Oberon. Collisional damping would then have collapsed it into a thin equatorial disk, from which the satellites eventually formed. The fact that the orbits of the satellites are prograde requires Uranus to have had a non-negligible initial obliquity (comparable to that of Neptune) before it was finally tilted to 98°.
* Uranus, Satellites;
* Satellites, Formation;
* Satellites, Dynamics
Originally posted by blackmetalmist
reply to post by LifeInDeath
Is it possible for this planet to end up crashing into another? Somehow being pulled by a gravitational force?
Originally posted by jheated5
They say the planet happened to fly in here from other solar system? I'm not buying it..... The idea of planet just flying around and just happens to fall in orbit behind another planet doesn't sit well with me....
Originally posted by Dustytoad
reply to post by LifeInDeath
You know physics, and astronomy...
Is there any evidence of a yet unknown gravitational influence on outside planets?
Is there a chance of a nemesis star, as a companion to our star.?
Is there anything in the Oort cloud that is acting funny?
Originally posted by randyvs
reply to post by Phage
Isn't Niburu sopposed to be a dwarf star ? I don't think this would qualify as Niburu if it's a planet. I think the mainstream is guilty of so much fear mongering. Just the same thanks to OP for jumping up and bringing this forward.
Originally posted by Somethingintheclouds
reply to post by blackmetalmist
Well theres a surprise they are now saying there is a planet in our solar system and guess what its going to be called nibiru mainstream media make me sick we knew about it for ages
Originally posted by freakjive
I cannot comment on the Niburu thing, as I don't know.
However, I must commend you for abandoning the sensationalist title from MSN when you posted!
Secret rogue planet may be hiding behind Neptune