10 Years IMO Video Meteor Network. Data Set and Analysis Procedure
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1 International Meteor Conference, Porec, Croatia, September 24-27, Years IMO Video Meteor Network Data Set and Analysis Procedure Sirko Molau Arbeitskreis Meteore e.v. (AKM), Germany IMC 2009 Sirko Molau: 10 Years IMO Video Meteor Network Data Set an Analysis Procedure 1/16
2 Agenda MetRec Data Set Analysis Procedure IMC 2009 Sirko Molau: 10 Years IMO Video Meteor Network Data Set an Analysis Procedure 2/16
3 MetRec 5 (I) Latest Development All cameras in the IMO Network use the MetRec software, which so far supports only DOS In 2008, D. Koschny presented the work of ESA programmer H. Smith to port MetRec to Windows Starting from February 2009, Hans and me have cooperated intensively on this issue (~20 code iterations since then)» The code base for DOS and Win has been combined, all OS specific functions were moved to specific modules» Some core routines (frame handling, time determination) underwent a significant redesign and simplification» A number of bugs that went unnoticed under DOS were identified and corrected» New features requested by different observer were implemented on the new code base The new version will be MetRec 5 IMC 2009 Sirko Molau: 10 Years IMO Video Meteor Network Data Set an Analysis Procedure 3/16
4 MetRec 5 (II) New Features Grab/GrabSeq/GrabStrm: date & time stamp can be inserted MetRec: a background image may be saved after a predefined amount of time; DST correction; Ref2Txt & Txt2Kml: create KML files in a comfortable way RadFind & StrmFind: implementation of the new radiant and meteor shower search algorithm (observability function, Laplace distribution, recomputed meteor shower assignment, meteor altitude formula); shower identification based on the MDC working list with >300 showers RefStars: combined measurement of several reference images MetRec, PostProc & Co: extension of PosDat header IDs 000-ZZZ, the frame grabber device number can be chosen if more than one grabber is installed (not yet fully tested) IMC 2009 Sirko Molau: 10 Years IMO Video Meteor Network Data Set an Analysis Procedure 4/16
5 MetRec 5 (III) Current Status Both OS versions can be compiled error-free from the same source code with two different compilers (Watcom and MS VC++) All keys combinations are working in both environments The code has been tested and is running on both platforms A few minor functions are not yet available under Windows (e.g. support of DCF clocks) D. Koschny has been using the Win version for almost a year now, the Polish observers have tested the program as well, but more field tests are still required test users are welcome MetRec 5 will be released later in 2009 IMC 2009 Sirko Molau: 10 Years IMO Video Meteor Network Data Set an Analysis Procedure 5/16
6 2009 Data Set (I) Motivation for a New Analyses The IMO Video Meteor Database has further grown since the last analyses: 188,000 met. (2006) 360,000 met. (2008) 450,000 met. (2009) >680 meteors per solar longitude interval The meteor shower detection algorithm has stand the practice test all showers newly found by the SonotaCo network could be confirmed with IMO data To the automated shower extraction was augmented with a manual refinement and plausibility check Provide input for the rework of the MDC meteor shower list in 2009 Last but not least: 10th Anniversary of the IMO Video Meteor Network IMC 2009 Sirko Molau: 10 Years IMO Video Meteor Network Data Set an Analysis Procedure 6/16
7 2009 Data Set (II) # Observing Nights Effective Observing Time [h] Per Ori Leo Gem Qua 5000 Lyr Solar Longitude IMC 2009 Sirko Molau: 10 Years IMO Video Meteor Network Data Set an Analysis Procedure 7/16 # Meteors # Meteors
8 2009 Data Set (III) Observer Country IMO Code Nights Teff Meteors Sirko Molau DE MOLSI , Jörg Strunk DE STRJO , Javor Kac SL KACJA , Ilkka Yrjölä FI YRJIL , Stane Slavec SL SLAST , Flavio Castellani IT CASFL , Orlando Benitez-Sanchez ES BENOR , Jürgen Rendtel DE RENJU , Bernd Brinkmann DE BRIBE , Detlef Koschny NL KOSDE , Mihaela Triglav SL TRIMI , Robert Lunsford US LUNRO , Enrico Stomeo IT STOEN , Stephen Evans UK EVAST , Wolfgang Hinz DE HINWO , Carl Hergenrother US HERCA , Steve Quirk AU QUIST , Rui Goncalves PT GONRU , Biondani Roberto IT ROBBI , Stefano Crivello IT CRIST , Mirko Nitschke DE NITMI , David Przewozny DE PRZDA , Stefan Ueberschaer DE UEBST , Ulrich Sperberg IT SPEUL , Maurizio Eltri DE ELTMA , Paolo Ochner IT OCHPA , Rosta Stork CZ STORO , Rob McNaught AU MCNRO , Andre Knöfel DE KNOAN ,0 648 Klaas Jobse NL JOBKL , Milos Weber SL WEBMI 29 49, Mitja Govedic HU GOVMI ,7 489 Antal Igaz CZ IGAAN ,7 369 other - OTHER , Overall , Data from Jan 1993 Jun 2009 >70 cameras >30 observers 12 countries (Australia, Czech Republic, Finland, Germany, Hungary, Italy, Portugal, Slovenia, Spain, the Netherlands, UK, USA) 12.3 years of continuous observations and 1.5 days of continuous meteors IMC 2009 Sirko Molau: 10 Years IMO Video Meteor Network Data Set an Analysis Procedure 8/16
9 Analysis Procedure (I) Radiant Search Find the set of radiants R that maximizes the conditional probability P (M R) given the set of meteors M: P (M R) = [exp (-0.8 D) * exp (-V/(0.4+V/50)] with: D... Radiant miss distance [ ] V... Velocity deviation [ /s] Cut the observations into solar longitude slices of 2 length, 1 shift Step size ½ in position and 1 km/s in velocity Iterative radiant search: Start: Accumulate P (M R) over all possible R Loop: Select the radiant R` with largest probability P (M R`) Determine all meteors M` belonging to R` Accumulate P (M R) over all possible R and subtract it from the original distribution End: Reassign the meteors to the meteor showers and recompute the shower parameters IMC 2009 Sirko Molau: 10 Years IMO Video Meteor Network Data Set an Analysis Procedure 9/16
10 Analysis Procedure (II) IMO Network Each dot one radiant radiants with met. Radiant velocity color coded Radiants strength intensity coded SonotaCo Network Each dot one orbit orbits Radiant velocity color coded IMC 2009 Sirko Molau: 10 Years IMO Video Meteor Network Data Set an Analysis Procedure 10/16
11 Analysis Procedure (III) IMO Network Ecliptical minus solar longitude vs. ecliptical latitude of radiant SonotaCo Network Ecliptical minus solar longitude vs. ecliptical latitude of radiant IMC 2009 Sirko Molau: 10 Years IMO Video Meteor Network Data Set an Analysis Procedure 11/16
12 Analysis Procedure (IV) IMO Network With observability correction IMO Network Without observability correction IMC 2009 Sirko Molau: 10 Years IMO Video Meteor Network Data Set an Analysis Procedure 12/16
13 Analysis Procedure (V) Meteor Shower Search Connect radiants with similar position/velocity in consecutive solar longitude intervals Minimum shower duration: 5 solar longitude (in further steps reduced to 3 ) Maximum shift in position: 7 Maximum shift in velocity: 7 km/s Compute shower parameters: Radiant position, drift, velocity Comparison against the MDC list and known sporadic sources for shower identification Compute the VR (video rate) profile Observability corrected shower counts Ratio of shower and sporadic meteors Correct for annual sporadic activity variation Scale to give ETA a VR max of 50 IMC 2009 Sirko Molau: 10 Years IMO Video Meteor Network Data Set an Analysis Procedure 13/16
14 Analysis Procedure (VI) Manual Refinement Omit uncertain intervals at the begin or end of meteor shower activity where The radiant position does not yield a consistent drift The shower velocity is not consistent with the average value The video rate falls below a certain limit Omit showers that have no consistent drift, velocity or a sufficient VR at all Split merged and combine splitted meteor showers Recompute shower parameters by weighted linear regression from the reduced activity interval Shower maximum Average radiant position and drift Average shower velocity and possibly drift Resulting accuracy (estimated for VR>2): <1 in position <1 km/s in velocity IMC 2009 Sirko Molau: 10 Years IMO Video Meteor Network Data Set an Analysis Procedure 14/16
15 Analysis Procedure (VII) Example: kappa-cygnids Boundaries obtained from the 2009 data set Maximum deviation in position between consecutive solar longitude intervals: 3 Minimum video rate: 0.7 1,4 1,2 1 Video Rate 0,8 0,6 0,4 0, Solar Longitude IMC 2009 Sirko Molau: 10 Years IMO Video Meteor Network Data Set an Analysis Procedure 15/16
16 The End Thanks for your attention! Questions? IMC 2009 Sirko Molau: 10 Years IMO Video Meteor Network Data Set an Analysis Procedure 16/16
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