Asteroids and TNOs with companions: component size ratio vs. primary size

compiled by Wm. Robert Johnston
last updated 13 October 2021

Component size ratio (Ds/Dp) is secondary diameter divided by primary diameter. Symbol sizes indicate component separation (a/Rp) expressed in terms of the radius of the primary. Some values are estimated based on assumed albedoes, densities, etc.

Binary dynamical types are based on taxonomy described by Pravec and Harris (2007) and by Lindsay et al. (2014); more discussion is available here. In summary, type codes are:

Some comments (under construction):


(older version:)

© 2014-2019, 2021 by Wm. Robert Johnston.
Last modified 13 October 2021.
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