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Monitoring the meteoroid flux using worldwide volunteers

Monitoring the meteoroid flux using worldwide volunteers

Talk given at the dot Astronomy 3 meeting,
4 April 2011, Oxford.

Ff713719b643a54899ee88a284d320fd?s=128

Geert Barentsen

April 04, 2011
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Transcript

  1. Monitoring the meteoroid flux using worldwide volunteers Geert Barentsen (@GeertMcTwit)

    International Meteor Organization
  2. Who am I?

  3. PhD slave student: IPHAS Photometric Halpha Survey (Barentsen et al.

    2011)
  4. NGC Catalogue (Dreyer 1888) Armagh Observatory - Northern Ireland Cup

    Anemometer (Robinson 1846) Human Orrery
  5. OASES - Art & Astronomy for peace http://star.arm.ac.uk/~mdp/oases/ Contact: Miruna

    Popescu (mdp@arm.ac.uk)
  6. Crowdsourcing HR diagram Effort or training required to participate #Crowd

    Meteor counting Giants Dwarfs This talk 500 000 5 000 000 5 000 500
  7. 1) Human eyeball observations still important! 2) Motivate citizen observers

    with quicklook analysis. 3) Smartphones/Twitter: promising but tricky. (Perseids - Fred Bruenjes) Key points
  8. Who cares about meteoroids?!

  9. US Navy Transit Satellite (before being shot with a 5

    cm metal ball moving at 6 km/s) (Cooke 2010)
  10. Aftermath

  11. Hubble solar panels: hundreds of mm-sized impacts http://space-env.esa.int/madweb/

  12. Tunguska timing+direction = consistent with Taurid meteor shower from comet

    Encke (e.g. Kresak 1978, Jopek 2008) Several km-sized objects now found in Taurid stream: 2003 WP21, 2002 XM35, 2004 GT10 (Jenniskens 2008) 'Breaking' News: comets like to fragment 73P/Schwassman-Wachmann 3 (Spitzer)
  13. So what do we observe?

  14. Churyumov-Gerasimenko dust trails (model: Jeremie Vaubaillon) Meteoroid streams: complex! (Inferred

    from David Hogg's model of everything)
  15. Dust trail (~ 1 hour) Meteor Rate Meteoroid streams: complex!

    Flux profiles are the primary tool to constrain models.
  16. Citizen-run video camera network International Meteor Organization - http://www.imo.net

  17. 12 new meteor showers discovered (Molau 2009) Only in western

    countries
  18. Fast-readout CCD Human eye Resolution 1 ~ 2 megapixel 120

    megarod Sensitivity @ 50 fps 10-6 ~ 10-7 lux (1 - 4th magnitude) 10-8 lux (6th magnitude) Dynamic range 1 : 1 000 1 : 1 000 000 000 (delay) Challenge: meteors move at 10 - 100 pixels / second
  19. Interval Limiting magnitude Count Tape recorder (+ brightness distribution) Visual

    observations
  20. Perseid 2009 meteor shower - visual counts A B C

    2009 August 13 5:23 UT Landsat 5 loses attitude control (Cooke 2010) Human observations: best-available temporal+spatial coverage
  21. Realtime results - demonstrate the contribution of individuals Time Meteor

    activity #observers
  22. http://www.imo.net

  23. Can we use smartphones?

  24. (Hartwig Lüthen 2001) (Sirko Molau 1989)

  25. Faint (54) Pause Bright (26) Fireball (3) Recording 00:17:23 Meteors

    Prototype being developed under NASA contract (not shown)
  26. LCD screens always produce white light Problematic for flux observations

    Solution: red plastic cover?!
  27. Where did you first see the object? Where did you

    last see the object? Automated triangulation of crowd vectors to classify: meteors, thai balloons, satellites, kittens ... Q: „What did I see?!“ A: „Give us your vectors!“ Smartphones useful for single UFO-like events
  28. Can we use Twitter data?

  29. World's largest sensor network Optical detector Processor sensors dump output

    on Twitter ? Sound sensor Battery Tripod
  30. USGS Twitter Earthquake Detections (Earle 2010) Cost of project: less

    than 1 seismometer Epicenter 'Earthquake' Tweets
  31. Tweet: #meteorwatch [postcode] [country] [meteor count] (But: participants did not

    report interval or 'zero' meteors )
  32. Date curl --user l:p --data "track=meteor,meteors,meteorite,..." http://stream.twitter.com/1/statuses/filter.json #Tweets Feb 2010

    Mar 2011 Harvesting meteor tweets 1.1 million meteor tweets since Feb 2011
  33. @VeloVeggies: just saw a gigantic fireball over the southeast. brighter

    then the moon and blue green color. @sarahrattenborg: holy balls. meteor. @RobinLeaf: we just saw a freaking meteorite!!!! omg! @maggiedammit: holy cr*p a meteor just burned up so bright it woke us P(Fireball | Tweets) #expletives ∝
  34. 2010 April 14/15 Fireball News reports 10 am 10 pm

  35. Tweets largely driven by TV & newspaper media Soap (Classifier:

    yes, but needs more training data.)
  36. 1) Human eyeball observations still important! 2) Motivate citizen observers

    with quicklook analysis. 3) Smartphones/Twitter: promising but tricky. (Perseids - Fred Bruenjes) Key points
  37. Thank you