# Anisotropic Ejection from Active Asteroid P/2010 A2: An Implication of Impact Shattering on an Asteroid

## TL;DR

This study models anisotropic dust ejection from asteroid P/2010 A2, showing impact shattering as the cause, consistent with laboratory impact experiments, and explaining observed dust and fragment motions over three years.

## Contribution

The paper introduces a novel anisotropic ejection model that successfully reproduces the observed features of P/2010 A2, providing evidence of impact shattering in the main asteroid belt.

## Key findings

- The anisotropic ejection model explains dust morphology and fragment motions.
- Impact energy Q* <~ 350 J/kg caused the asteroid shattering.
- Laboratory impact experiments support the impact shattering scenario.

## Abstract

We revisited a mass ejection phenomenon that occurred in asteroid P/2010 A2 in terms of the dynamical properties of the dust particles and large fragments. We constructed a model assuming anisotropic ejection within a solid cone-shaped jet and succeeded in reproducing the time-variant features in archival observational images over ~3 years from 2010 January to 2012 October. When we assumed that the dust particles and fragments were ejected in the same direction from a point where no object had been detected in any observations, the anisotropic model can explain all of the observations including (i) the unique dust cloud morphology, (ii) the trail surface brightness and (iii) the motions of the fragments. Our results suggest that the original body was shattered by an impact with the specific energy of Q* <~ 350 J/kg, and remnants of slow antipodal ejecta (i.e., anisotropic ejection in our model) were observed as P/2010 A2. The observed quantities are consistent with those obtained through laboratory impact experiments, supporting the idea that the P/2010 A2 event is the first evidence of the impact shattering occurred in the present main asteroid belt.