Events Calendar

Meteor shower predictions..., Auriane Egal

Date:
Thursday, October 11, 2018
Time:
1:30 pm - 2:30 pm
Location:
Physics & Astronomy Building (PAB)
Room: 100
Cost:
Free

Department of Physics and Astronomy

PHYSICS & ASTRONOMY COLLOQUIUM

Dr. Auriane Egal 

Department of Physics & Astronomy
Western University

“Meteor shower predictions: Future Draconid Outbursts”

ABSTRACT

With the development of computational resources, meteor predictions based on numerical modelling of meteoroid streams have become commonly exploited. Within a virtual solar system, millions of simulated meteoroids are ejected from their parent comet and followed through time—sometimes for centuries—to determine if they could produce future observable meteor showers on Earth. Though this approach has seen much success regarding the prediction of the time and origin of observed meteor outbursts, shower intensity estimates are still difficult to determine reliably from such numerical simulations.

In this presentation, we will explore the advantages and pitfalls of the meteoroid stream modelling through the specific case of the October Draconids meteor shower. Independent predictions of the 2018 Draconids on Earth and its surroundings were performed by the Western Meteor Physics Group (WMPG) and the NASA Meteoroid Environment Office. Despite limited knowledge of the physical and dynamical properties of the parent body, our simulations were successful in predicting the time and intensity of the main optical Draconids events. All the simulations performed point towards an expected low meteor activity on Earth around midnight the coming 9th of October. However, very strong activity (with an equivalent on Earth of a few thousands of meteors per hour) is expected at the L1 and L2 Lagrange points the next 8th of October. The meteoroid flux around the Gaia spacecraft, orbiting around the L2 region, is particularly significant; the satellite risks to be impacted by large Draconid meteoroids, travelling with a velocity of about 20 km/s.

The Canadian Meteor Observation Radar (CMOR), as well as the optical detection systems deployed by the WMPG will observe the skies on October 8-9, 2018. Measurements performed by these instruments will allow us to confirm or reject our model’s hypothesis and 2018 prediction.

STUDENTS – after the talk, you’re encouraged to return to the 2nd floor Atrium lounge to meet with the speaker.
COFFEE – coffee and cookies will be available in the 2nd floor Atrium lounge at 1:15 p.m.
CELL PHONES – as a courtesy to the speaker and audience, please set your cellphones to “silent” mode. Thanks!
Host:
Prof. P. G. Brown
Contact:
Jodi Guthrie - Assistant to the Chair
jodi@uwo.ca
519-661-2111 ext.86438
Event Type:


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