Orbital and Physical Characteristics of Meter-scale Impactors from Airburst Observations P. Brown*1,2, P. Wiegert1,2, D. Clark3 and E. Tagliaferri4 1Dept. of Physics and Astronomy, University of Western Ontario, London, Ontario, Canada N6A 3K7 2Centre for Planetary Science and Exploration, University of Western Ontario, London, Ontario, Canada N6A 5B8 3Dept of Earth Sciences, University of Western Ontario, London, Ontario, Canada N6A 5B7 4ET Space Systems, 5990 Worth Way, Camarillo, CA, 93012 USA *Corresponding authors email:
[email protected] 64 pages 6 tables 7 figures Submitted to Icarus: June 12, 2015 In revised form: September 23, 2015 Accepted: November 23, 2015 1 Proposed Running Head : meter-scale Earth impactors Editorial Correspondence to : Dr. Peter Brown Department of Physics and Astronomy University of Western Ontario London, ON N6A 3K7 CANADA Phone : 1-519-661-2111 x86458 Fax : 1-519-661-4085 E-mail address :
[email protected] 2 Abstract We have analysed the orbits and ablation characteristics in the atmosphere of 59 earth-impacting fireballs, produced by meteoroids one meter in diameter or larger, described here as meter-scale. Using heights at peak luminosity as a proxy for strength, we determine that there is roughly an order of magnitude spread in strengths of the population of meter-scale impactors at the Earth. We use fireballs producing recovered meteorites and well documented fireballs from ground-based camera networks to calibrate our ablation model interpretation of the observed peak height of luminosity as a function of speed. The orbits and physical strength of these objects are consistent with the majority being asteroidal bodies originating from the inner main asteroid belt.