The printable version is no longer supported and may have rendering errors. Please update your browser bookmarks and please use the default browser print function instead.
G-type asteroids are a relatively uncommon type of carbonaceousasteroid that makes up approximately 5% of asteroids. The most notable asteroid in this class is 1 Ceres.
Characteristics
Generally similar to the C-type objects, but contain a strong ultraviolet absorption feature below 0.5 μm. An absorption feature around 0.7 μm may also be present, which is indicative of phyllosilicate minerals such as clays or mica.
In the SMASS classification
the G-type corresponds to the Cgh and Cg types, depending on the presence or absence (respectively) of the absorption feature at 0.7 μm. The G-type, C-type and some rare types are sometimes collected together into a wider C-group of carbonaceous asteroids.