V-type near-Earth asteroids: Dynamics, close encounters and impacts with terrestrial planets
- Autor(en)
- Mattia Galiazzo, E. A. Silber, David Bancelin
- Abstrakt
Background: Asteroids colliding with planets vary in composition and taxonomical type. Among Near-Earth Asteroids (NEAs) are the V-types, basaltic asteroids that are classified via spectroscopic observations. Materials and Methods: we performed numerical simulations and statistical analysis of close encounters and impacts between V-type NEAs and the terrestrial planets over the next 10 Myr. We study the probability of V- type NEAs colliding with Earth, Mars and Venus, as well as the Moon. We perform a correlational analysis of possible craters produced by V-type NEAs, using available catalogs for terrestrial impact craters. Results: The results suggest that V-type NEAs can have many close encounters below 1 LD and even some of them impacts with all the terrestrial planets, the Earth in particular. There are four candidate craters on Earth that were likely caused by V-type NEAs. Conclusion: At least 70% of the V-type NEAs can have close encounters with the terrestrial planets (and 58% with the Moon). They can collide with all the terrestrial planets. In particular for the Earth the average rate is one every ∼12 Myr. The two craters with the highest probability of being generated by an impact with a basaltic impactor are: the Strangways crater (24 km diameter) in Australia and the Nicholson crater (12.5 km diameter) in Canada.
- Organisation(en)
- Institut für Astrophysik
- Externe Organisation(en)
- University of Western Ontario
- Journal
- Astronomische Nachrichten
- Band
- 338
- Seiten
- 375 - 384
- Anzahl der Seiten
- 10
- ISSN
- 0004-6337
- DOI
- https://doi.org/10.1002/asna.201613273
- Publikationsdatum
- 05-2017
- Peer-reviewed
- Ja
- ÖFOS 2012
- 103003 Astronomie, 103004 Astrophysik
- Schlagwörter
- ASJC Scopus Sachgebiete
- Astronomy and Astrophysics, Space and Planetary Science
- Link zum Portal
- https://ucrisportal.univie.ac.at/de/publications/6f6812a5-014a-4251-b770-e58eda0a0dba