Encyclopedia of Planetary Landforms

2015 Edition
| Editors: Henrik Hargitai, Ákos Kereszturi

Sesquinary Crater

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

Definition

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.)

Synonyms

Crater produced by planetocentric debris;  Poltorary crater

Description

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.

Formation

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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References

  1. Alvarrelos JL, Zahnle KJ, Dobrovolskis AR, Hamill P (2005) Fates of satellite ejecta in the Saturn system. Icarus 178(1):104–123Google Scholar
  2. Bierhaus EB, Dones L, Alvarellos JL, Zahnle K (2012) The role of ejecta in the small crater populations on the mid-sized saturnian satellites. 218(1):602–621Google Scholar
  3. Grady MM (2002) The catalogue of meteorites. Online edition. http://www.nhm.ac.uk/research-curation/research/projects/metcat/. Last updated 2002
  4. Meteoritical Bulletin Database (2013) Meridiani planum. http://www.lpi.usra.edu/meteor/metbull.php?code=32789
  5. Ramsey KR, Head JW III (2013) Mars impact ejecta in the regolith of Phobos: bulk concentration and distribution. Planet Space Sci 87:115–129CrossRefGoogle Scholar
  6. Schenk PM, Zahnle K (2007) On the negligible surface age of Triton. Icarus 192(1):135–149CrossRefGoogle Scholar
  7. Zahnle K, Alvarellos JL, Dobrovolskis A, Hamill P (2008) Secondary and sesquinary craters on Europa. Icarus 194(2):660–674CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  1. 1.NASA Ames Research Center/NPPMoffett FieldUSA