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Barring detailed mass determinations, [4] the mass can be estimated from the diameter and assumed density values worked out as below. = Besides these estimations, masses can be obtained for the larger asteroids by solving for the perturbations they cause in each other's orbits, [5] or when the asteroid has an orbiting companion of known orbital radius.
Asteroids are classified by their characteristic emission spectra, with the majority falling into three main groups: C-type, M-type, and S-type. These describe carbonaceous (carbon-rich), metallic, and silicaceous (stony) compositions, respectively. The physical composition of asteroids is varied and in most cases poorly understood.
B-type asteroids are a relatively uncommon type of carbonaceous asteroid, falling into the wider C-group; the 'B' indicates these objects are spectrally blue. [1] In the asteroid population, B-class objects can be found in the outer asteroid belt , and also dominate the high- inclination Pallas family which includes the third-largest asteroid 2 ...
Over 200 asteroids are known to be larger than 100 km, [63] and a survey in the infrared wavelengths has shown that the asteroid belt has between 700,000 and 1.7 million asteroids with a diameter of 1 km or more. [64] The number of asteroids in the main belt steadily increases with decreasing size.
Archival data on the physical properties of comets and minor planets are found in the PDS Asteroid/Dust Archive. [28] This includes standard asteroid physical characteristics such as the properties of binary systems, occultation timings and diameters, masses, densities, rotation periods, surface temperatures, albedoes, spin vectors, taxonomy ...
Asteroids in the leading ... Little is known about the masses, chemical composition, rotation or other physical properties of the Jupiter trojans. [5] Rotation
135 Hertha is an asteroid from the inner region of the asteroid belt, approximately 77 kilometers (48 miles) in diameter.Discovered on 18 February 1874 by German–American astronomer Christian Peters at the Litchfield Observatory near Clinton, New York, [1] it was named after the Teutonic and Scandinavian goddess of fertility, Hertha, also known as Nerthus. [2]
In 1975, astronomers Clark R. Chapman, David Morrison, and Ben Zellner developed a simple taxonomic system for asteroids based on color, albedo, and spectral shape.The three categories were labelled "C" for dark carbonaceous objects, "S" for stony (siliceous) objects, and "U" for those that did not fit into either C or S. [2] This basic division of asteroid spectra has since been expanded and ...