Volume 635, March 2020
|Number of page(s)||16|
|Section||Planets and planetary systems|
|Published online||27 March 2020|
A new method for measuring the meteor mass index: application to the 2018 Draconid meteor shower outburst★
Department of Earth Sciences, University of Western Ontario,
N6A 5B7, Canada
2 Department of Physics and Astronomy, University of Western Ontario, London, Ontario, N6A 3K7, Canada
3 Centre for Planetary Science and Exploration, University of Western Ontario, London, Ontario, N6A 5B8, Canada
Accepted: 6 February 2020
Context. Several authors predicted an outburst of the Draconid meteor shower in 2018, but with an uncertain level of activity.
Aims. Optical meteor observations were used to derive the population and mass indices, flux, and radiant positions of Draconid meteors.
Methods. We performed 90 min of multi-station observations after the predicted peak of activity using highly sensitive Electron Multiplying Charge Coupled Device cameras. The data calibration is discussed in detail. A novel maximum likelihood estimation method was developed to compute the population and mass index with robust error estimation. We applied the method to observed Draconids and used the values to derive the flux. Meteor trajectories were computed and compared to predicted radiant positions from meteoroid ejection models.
Results. We find a mass index of 1.74 ± 0.18 in the 30 min bin after the predicted peak, and 2.32 ± 0.27 in the subsequent 60 min. The location and the dispersion of the radiant are a good match to modeled values, but there is an offset of 0.4° in solar longitude.
Key words: meteorites, meteors, meteoroids / comets: individual: 21P/Giacobini-Zinner
The input data and the trajectory solutions are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (126.96.36.199) or via http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/635/A153
© ESO 2020
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.