Encyclopedia of Planetary Landforms

2015 Edition
| Editors: Henrik Hargitai, Ákos Kereszturi

Sesquinary Crater

  • Henrik Hargitai
Reference work entry
DOI: https://doi.org/10.1007/978-1-4614-3134-3_402


A crater produced by impact ejecta that went into a temporary orbit about a body and subsequently impacted onto another body in the same planetary system. (If ejecta leaves the system and impacts another body in another system, it produces a primary crater; if it re-impacts onto the same body, it makes a secondary crater.)


Crater produced by planetocentric debris;  Poltorary crater


Sesquinary craters may have a character intermediate between primary craters and conventional secondary craters. It may be possible to distinguish sesquinaries from primary and secondary craters on the basis of morphology.


Some ejecta from a primary impact may exceed the target’s escape speed and escape the planet. If it enters the heliocentric orbit, it will become a primary projectile and eventually re-impacts the target or another planet, as do Martian SNC meteorites. The majority of the ejecta have a speed less than the body’s escape velocity. Such ejecta will be...

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  1. 1.NASA Ames Research Center/NPPMoffett FieldUSA