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27 papers
A cornucopia of null results: A statistical analysis of fireballs reported to the American Meteor Society
Althea V. Moorhead
In March 2026, the American Meteor Society announced that a "surge" of large fireballs had been reported to their website in the first quarter of the year, and that these fireballs…
Meteor statistics I: The distribution of instrumental magnitudes
Althea V. Moorhead, Peter G. Brown, Margaret D. Campbell-Brown +2
The distribution of meteor magnitudes is known to follow an exponential distribution, where the base of this distribution is called the population index. The distribution of observ…
Modeling the meteoroid environment far from the ecliptic plane
Althea V. Moorhead, Petr Pokorný, Marcus A. Holden +1
We describe a new version (numbered 3.1) of NASA's Meteoroid Engineering Model (MEM) in which we extend the model to handle locations that lie more than a few degrees in latitude o…
The threshold at which a meteor shower becomes hazardous to spacecraft
Althea V. Moorhead, William J. Cooke, Peter G. Brown +1
Although the risk posed to spacecraft due to meteoroid impacts is dominated by sporadic meteoroids, meteor showers can raise this risk for short periods of time. NASA's Meteoroid E…
A library of meteoroid environments encountered by spacecraft in the inner solar system
Althea V. Moorhead, Katie Milbrandt, Aaron Kingery
NASA's Meteoroid Engineering Model (MEM) is designed to provide aerospace engineers with an accurate description of potentially hazardous meteoroids. It accepts a spacecraft trajec…
A reference meteor magnitude for intercomparable fluxes
Althea V. Moorhead, Denis Vida, Peter G. Brown +1
The rate at which meteors pass through Earth's atmosphere has been measured or estimated many times over; existing flux measurements span at least 12 astronomical magnitudes, or ro…