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Anything that would be comprised of THIS 'planetoid' would be a bigger planet, itself
Most cometary nuclei are thought to be no more than about 10 miles (16 kilometers) across. But we do know of cometary nuclei up to 40km across.
The asteroid belt.... (skip)....
More than half the mass of the main belt is contained in the four largest objects: Ceres, 4 Vesta, 2 Pallas, and ....10 Hygiea. These have mean diameters of more than 400 km, while Ceres, the main belt's only dwarf planet, is about 950 km in diameter.
The remaining bodies range down to the size of a dust particle. The asteroid material is so thinly distributed that multiple unmanned spacecraft have traversed it without incident. Nonetheless, collisions between large asteroids do occur, and these can form an asteroid family whose members have similar orbital characteristics and compositions. Collisions also produce a fine dust that forms a major component of the zodiacal light. Individual asteroids within the main belt are categorized by their spectra, with most falling into three basic groups: carbonaceous (C-type), silicate (S-type), and metal-rich (M-type).
The asteroid belt formed from the primordial solar nebula as a group of planetesimals, the smaller precursors of the planets. Between Mars and Jupiter, however, gravitational perturbations from the giant planet imbued the planetesimals with too much orbital energy for them to accrete into a planet. Collisions became too violent, and instead of sticking together, the planetesimals shattered. As a result, most of the main belt's mass has been lost since the formation of the Solar System. Some fragments can eventually find their way into the inner Solar System, leading to meteorite impacts with the inner planets. Asteroid orbits continue to be appreciably perturbed whenever their period of revolution about the Sun forms an orbital resonance with Jupiter. At these orbital distances, a Kirkwood gap occurs as they are swept into other orbits.
Originally posted by stereologist
reply to post by SquirrelNutz
You begin by starting with a sub-planet sized mass, much, much less than a planet sized mass and then you cook up some numbers and then you end up with up with what - the destruction of an object.
The problem is that you began with an object that was not a planet. It was a lunar mass object. At least that larger than Pluto.
Originally posted by SquirrelNutz
Originally posted by stereologist
reply to post by SquirrelNutz
You begin by starting with a sub-planet sized mass, much, much less than a planet sized mass and then you cook up some numbers and then you end up with up with what - the destruction of an object.
The problem is that you began with an object that was not a planet. It was a lunar mass object. At least that larger than Pluto.
Okay. I'll agree with that. Now, what.