Leonids 2004, 3rd Circular

A total of 327 visual observing periods have been collected
for the 2004 Leonid meteor shower. A grand total of 1249 shower
meteors was reported. Dust trail computations gave predictions for Nov 8 ~23h30 (30-rev trail), Nov 17 ~9h20 (2-rev),
Nov 19 ~6h40 (20-rev), Nov 19 ~21h40 (8-rev), Nov 21 ~8h20
(26-rev), Nov 21 ~10h (25-rev). The encounter with the 8-rev
trail was expected to show ZHRs of several 10s to perhaps
65 per hour.

Since the predicted activity levels were not much exceeding
the general background activity of the Leonid meteor shower,
it was clear that the detection of individual dust trail
natures will not be easy. As a matter of fact, the observations do not show any peaks coinciding with one of the
encounter times.

The enhanced rates of November 8 are far from significant,
as they are based on very few shower meteors seen from Europe
at low radiant elevations. No reports from Asia are available
for that UT-evening.

  
  ------------------------------------------------------  
  Date (UT) Time Solarlong nINT nLEO ZHR  
  ------------------------------------------------------  
  Nov 08.939 22:32 226.802  11  4  10 +- 4  
  Nov 08.975 23:24 226.838  10  5  6 +- 2  
  Nov 09.021 00:30 226.885  6  5  8 +- 3  
  Nov 12.275 06:36 230.157  6  8  4 +- 1  
  Nov 14.175 04:12 232.070  4  13  6 +- 2  
  Nov 15.984 23:37 233.893  7  12  5 +- 1  
  Nov 16.862 20:41 234.778  9  51  17 +- 2  
  Nov 17.484 11:37 235.405  7  33  10 +- 2  
  Nov 17.795 19:05 235.719  10  89  36 +- 4  
  Nov 18.012 00:17 235.938  20  55  26 +- 3  
  Nov 18.077 01:51 236.003  18  62  22 +- 3  
  Nov 18.420 10:05 236.349  5  30  12 +- 2  
  Nov 18.941 22:35 236.875  22  97  35 +- 4  
  Nov 19.037 00:53 236.972  31 115  32 +- 3  
  Nov 19.094 02:15 237.029  12  35  26 +- 4  
  Nov 19.198 04:45 237.134  10  47  16 +- 2  
  Nov 19.441 10:35 237.380  10 161  24 +- 2  
  Nov 19.767 18:24 237.709  12  47  20 +- 3  
  Nov 19.865 20:46 237.808  10  46  23 +- 3  
  Nov 19.900 21:36 237.843  10  41  22 +- 3  
  Nov 19.944 22:39 237.887  14  56  24 +- 3  
  Nov 19.983 23:36 237.927  17  26  16 +- 3  
  Nov 20.016 00:23 237.960  22  58  27 +- 4  
  Nov 20.059 01:25 238.003  17  62  21 +- 3  
  Nov 20.143 03:26 238.088  13  37  10 +- 2  
  Nov 20.851 20:25 238.803  6  34  17 +- 3  
  Nov 21.363 08:43 239.320  8  20  4 +- 1  
  ------------------------------------------------------  
  

The activity profile is based on the observing periods by Harshad Abhyankar (India), Puya Ahmadifard (Iran), Alexandre Amorim (Brazil), Karl Antier (France), Lars Bakman (Denmark), Ricardas Balciunas (Lithania), Peter Bias (USA), Andreas Buchmann (Switzerland), Vladimir Burgic (Serbia), Tibor Csorgei (Slovakia), Charuta Deshpande (India), Shrikant Dhumal (India), David Dickinson (USA), Sietse Dijkstra (the Netherlands), Jelena Djuricin (Serbia), Lucio Furlanetto (Italy), George W. Gliba (USA), Robin Gray (USA), Madhura Gokhale (India), Pavol Habuda (Slovakia), Takema Hashimoto (Japan), Amir Hassanzadeh (Iran), Davood Hemati (Iran), Veli-Pekka Hentunen (Finland), Kamil Hornoch (Czech Republic), Greg Hudson (Australia), Robert Javer (Italy), Carl Johannink (the Netherlands), Jakub Kapus (Slovakia), Martin Kapus (Slovakia), Srdjan Keca (Serbia), Soheil Khoshbinfar (Iran), Ralf Koschack (Germany), Richard Kramer (USA), Mayuri Kulkarni (India), Rhishikesh Kulkarni (India), Peter van Leuteren (the Netherlands), Ming-hui Liang (China), Mike Linnolt (USA), Robert Lunsford (USA), Qiang Ma (China), Adam Marsh (Australia), Pierre Martin (Canada), Mikhail Maslov (Russia), Alastair McBeath (UK), Norman McLeod (USA), Huan Meng (China), Ivica Mihaljevic (Serbia), Koen Miskotte (the Netherlands), Amruta Modani (India), Markku Nissinen (Finland), Jens O. Olesen (Denmark), Carles Pineda Ferre (Spain), Nilesh Puntambekar (India), Pulin Raje (India), Jurgen Rendtel (Germany), Branislav Savic (Serbia), Nikhil Sharma (India), George Spalding (UK), Wesley Stone (USA), Ouyang Tianjing (China), Shigeo Uchiyama (Japan), Michel Vandeputte (Belgium), Valentin Velkov (Bulgaria), Nilesh Wani (India), Hao Wu (China), Quanzhi Ye (China), Ilkka Yrjola (Finland), Menglin Zhang (China), Jin Zhu (China).

The solar longitudes refer to equinox J2000.0, ZHRs are
computed with a population index of r=2.0 and a radiant
height correction of 1/sin(hR). nINT is the number of
observing periods in the average, nLEO the number of
Leonids involved.