Skip to main content

Catastrophic Disruption of Hollow Ice Spheres

Harriss, K.H., Burchell, Mark J. (2020) Catastrophic Disruption of Hollow Ice Spheres. The Planetary Science Journal, 1 (1). p. 19. E-ISSN 2632-3338. (doi:10.3847/PSJ/ab8f34) (KAR id:81521)

PDF Publisher pdf
Language: English

Creative Commons Licence
This work is licensed under a Creative Commons Attribution 4.0 International License.
Download (3MB) Preview
Official URL


Catastrophic disruption is a possible outcome of high-speed collisions in the solar system. The critical energy density Q* (impact energy/mass of the target), which is taken to mark the onset of catastrophic disruption, occurs when the largest intact fragment post-impact is 50% of the original target mass. Studies of Q* usually suppose the target body is a solid, rigid object. However, what if the body has a rigid shell and a hollow interior? Here, hollow ice spheres (a diameter of 19–20 cm with an ice thickness of 2.5–3.6 cm) were impacted at speeds up to ∼5 km/s. Catastrophic disruption occurred at Q* ∼ 25.5 ± 0.5 J kg−1, greater than that for similar size solid, or water-filled ice spheres (16–18 J kg−1). However, while the Q* value has increased, the actual impact energy associated with the new value of Q* has not, and the change in Q* arises due to the lower mass of the hollow target bodies

Item Type: Article
DOI/Identification number: 10.3847/PSJ/ab8f34
Projects: [UNSPECIFIED] Planetary Science at the University of Kent
Uncontrolled keywords: Impact phenomena, Jovian and Saturnian satellites, catastrophic disruption
Subjects: Q Science > QB Astronomy > QB651 Planets, Minor
Divisions: Faculties > Sciences > School of Physical Sciences > Centre for Astrophysics and Planetary Sciences
Depositing User: Mark Burchell
Date Deposited: 04 Jun 2020 09:25 UTC
Last Modified: 14 Jul 2020 10:24 UTC
Resource URI: (The current URI for this page, for reference purposes)
Harriss, K.H.:
Burchell, Mark J.:
  • Depositors only (login required):


Downloads per month over past year