List of Solar System objects by mass
- List of Solar System objects by mass
This is a list of Solar System objects by mass, in decreasing order. This list is incomplete because the masses of many minor planets are not accurately known. The ordering is similar to the order of a list of Solar System objects by radius. Some objects are smaller, but denser, than others. Neptune, for example, is more massive than Uranus despite being smaller. Likewise, Mercury is much more massive than both Ganymede and Titan despite being smaller.
:"Note: Satellites have been designated by an asterisk."
Yottagram range
Following is a list of Solar System objects more massive than 1021 kilograms (one [kilogram#SI multiples|yottagram [Yg] ). All of them are known or expected to be approximately spherical. [Astronomical bodies form into rounded shapes (oblate spheroids) when the gravity of their own mass is sufficient to overcome the structural stength of their intrinsic materials and the friction between those materials. This is called gravitational collapse. ] See also List of planetary bodies.:"Photographs of objects are on a black background; artists' impressions are on a grey background."
Petagram range
Objects of mass between 1012 kg to 1015 kg (less than 1000 Petagrams (Pg) ). A few of the smallest of the irregular satellites of the gas planets are listed here, as well as the largest near-Earth asteroids due to unusual interest for their nearness. (See also: list of NEAs by distance from Sun.) Other NEOs that are not asteroids (e. g. inner-solar-system comets) are almost always less massive than 1 Pg.
Omissions
Many of these values were taken directly from the appropriate Wikipedia article. Some were taken from the [http://nssdc.gsfc.nasa.gov/planetary/planetfact.html Planetary Fact Sheets] . The mass of 20000 Varuna was estimated based on values given at [http://www.ifa.hawaii.edu/faculty/jewitt/varuna.html] for its diameter and density. Several large objects (please list them here) are not listed because their masses are not yet given on their main articles. 24 Themis is not listed because of controversy about its density (see ). Eris has been given an estimate based on its size, the orbit of Dysnomia, and likely composition.
References
See also
*List of planetary bodies
*List of noteworthy asteroids
*Definition of planet
*Mesoplanet
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