10 Years IMO Video Meteor Network Impact on working lists
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1 10 Years IMO Video Meteor Network Impact on working lists Jürgen Rendtel International Meteor Organization & Astrophysical Institute Potsdam International Meteor Conference 2009, Porec, Croatia September 24-27
2 Outline - Introduction - Outer regions of showers: ORI & QUA - Comae Berenicids or/and December Leonis Minorids - Meteoroid velocity variations - New recent detections - Annual updates of the IMO working list?
3 Search for showers early target W.F. Denning Memoirs of the Royal Astron. Soc. 53, 1899, ies MNRAS 50, 1890,
4 Catalogue there are considerably more than 50 showers in play on any and every night of the year - based on single station visual meteors - poor criteria
5 Current shower compilations IAU Meteor Data Center Currently 360 showers 64 established 296 working status
6 Current shower compilations IMO Working List Currently 33 showers +ANT source (IMO Shower Calendar 2010)
7 Ejection from the parent and orbit distribution: different orbits slow = small orbit Perseids Sun Jupiter orbit in flight direction very fast may leave planetary system outer regions more dispersed Sun Earth orbit Quadrantids
8 Orionids: longer activity period? Radiant position varies significantly at start & end
9 Orionids: longer activity period? Radiant position varies significantly at start & end Obviously still ORI - but defining a source? Consequence for a new detection: Δα, Δδ < 3 / 1 solar long.
10 Orionids: longer activity period? Radiant position varies significantly at start & end rate low approaching detection limit ORI remain above threshold VR=0.7
11 Orionids: longer activity period? Radiant position varies significantly at start & end rate low approaching detection limit only outside the shown period Conclusion: rate above detection limit and radiant well defined extended period deg (Oct 04-Nov 15) [Oct 02-Nov 07]
12 Quadrantids Almost vertical orbital plane Very short activity period Calculations (Vaubaillon, if 2003 EH1 belongs to Machholz complex) Radiant position varies by >3 per 1 sol.long. at both ends
13 Quadrantids extended activity? Activity only in central bins high Wide peak because of binning data and peak time variations Uncertain radiants very likely QUA + VR>1 (above threshold) Conclusion: Activity period (Jan 02-10) [Jan 01-05]
14 Quadrantids extended activity? Activity only in central bins high Wide peak because of binning data and peak time variations Uncertain radiants very likely QUA + VR>1 (above threshold) Conclusion: Activity period (Jan 02-10) [Jan 01-05]
15 Mysterious Comae Berenicids? Radiant found at the COM position VR>2.0 well above threshold
16 Another shower! Radiant further NW DLM (Dec. Leonis Minorids) VR>4.0 (almost 2x COM) much longer period
17 Conclusion from video data: 2 showers DLM: (Dec 5-Feb 4) COM: (Dec 12-23)
18 Velocity shift during the stream passage: Orionids Systematic shift of the meteoroid entry velocity over the activity period: km/s per 1 sol.long km/s
19 Velocity shift during the stream passage: Orionids... Systematic shift of the meteoroid entry velocity over the activity period: km/s per 1 sol.long km/s Opposite shift direction Over ETA profile: km/s per 1 sol.long.
20 Velocity shift during the stream passage: Results Shower Period Sol.long. 6 V_inf (Peak) Shift per 1 km/s km/s LYR ETA JPE (July Pegasids) 1 CAP SDA KCG STA ORI NTA NOO (Nov. Orionids) 16 HYD QUA
21 New detections from the video data (total sample > video meteors!) Shower Period Radiant 409 NCY nu-cygnids DPI delta-piscids V_inf VR #meteors 42 km/s MUL mu-lyrids ATR alpha-triang SLY Sep. Lyncids SIC Sep iota-cas ETT eta-taurids beta-herculids CAN c-andromedids 412 FOP f-ophiuchids 73 ZDR zeta-draconids 415 AUP August Piscids
22 New detections from the video data (total sample > video meteors!)
23 New detections Most are very weak showers Exceptions: 410 delta-piscids (Jun 20-25) 414 alpha-triangulids (Jul 22-27)
24 Conclusions: Video data provide limits of shower activity radiant position + drift velocity data new detections working status IMO shower list includes established showers (aim: coordinate data collection) only few updates per year further work: Showers in Aur-Per (Sep-Oct), Antihelion source(s)
25 Thank you for your attention!
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