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2009 Orionids - Radio results

David Entwistle (UK)

My radio results suggest Orionid activity built steadily from the early hours of the October 18th through to the October 20th. Activity appears to have continued at elevated rates, though possibly declining slightly, through to the morning of the October 25th. There is no indication of a strong early peak, on October 17-18, but clearly this only covers the intervals when the radiant is significantly above my horizon.

Entwistle 2009 Orionid radio results

Steve Roush (USA)

For an observer in the USA, the Orionid radiant is above the horizon for a different period of time than for a European observer. The radio meteor results from Steve Roush suggest that there may have been a modest early peak in Orionid rates between 2009 10 17 08:00 UT and 2009 10 17 16:00 UT. This would have occurred with an unfavourable radiant position for European radio observers.

Roush Orionid 2009 data

 

 

2006 Orionids - Radio results

The following information is based on the radio results obtained for the 2006 Orionids. A detailed analysis of the 2006 Orionid visual results is presented in WGN35:2**. This work indicates that the 2006 Orionid shower ZHR-profile had a complex multi-peaked nature. This characteristic violates one of the assumption used when performing the SBV analysis of a meteor stream and may explain the differences obtained analysing the different observer's results.

The following information is based on the contents of Meteor Observation Bulletin No.159.

Radio Orionids 2006 Peak Time (UT)

Radio Orionids 2006 Peak Solar Longitude (J2000)

Gaspard DeWilde (Belgium)

Data

Analysis

Tmax = 2006 October 21, 13:51 UT +? h , width a = 18, b = 28

Felix Verbelen (Belgium)

Data

Analysis

Tmax = 2006 October 22, 07:15 UT +19 h, width a = 55, b = 49

Acknowledgements

I am grateful to the following persons for their efforts in recording meteor counts: Enric Fraile Algeciras (Spain), Orlando Benitez Sanchez (Gran Canaria), Michael Boschat (Canada), Jeff Brower (Canada), Gaspard De Wilde (Belgium), David Entwistle (England), Pierre De Groote (Belgium), Patrice Guerin (France), Peter Knol (The Netherlands), Stan Nelson (USA), Sadao Okamoto (Japan), Valter Gennoro (Italy), Mike Otte (USA), Andy Smith (England), Dave Swan (England), Istvan Tepliczky (Hungary), Felix Verbelen (Belgium). I'm especially grateful to Christian Steyaert for his efforts in collecting, collating and distributing the rmobs data and to Pierre Terrier for his work in supporting this effort.

References

* 'A numerical method to aid in the combined determination of stream activity and Observability Function', by Christian Steyaert, Jeffrey Brower, and Felix Verbelen. Taken from WGN, the Journal of the IMO 34:3 (2006).

** 'Three days of enhanced Orionid activity in 2006 - Meteoroids from a resonance region?', by Jürgen Rentel. WGN, the Journal of the IMO 35:2 (2006).

2005 Orionids - Radio results

The following information is based on the contents of Meteor Observation Bulletin No.147.

Radio Orionids 2005 Peak Time (UT)

 

Radio Orionids 2005 Peak Solar Longitude (J2000)

 

Enric Algeciras (Spain)

Data

Analysis

Tmax = 2006 October 21, 13:51 UT +? h , width a = 18, b = 28