(meteorobs) IMO Shower Circ.: 2004 Leonids updated

RainerArlt rarlt at aip.de
Thu Nov 25 07:35:21 EST 2004


           -------------------------------------
           I M O   S h o w e r   C i r c u l a r
           -------------------------------------

                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 predic-
tions 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 observa-
tions 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.


Rainer Arlt, 2004 Nov 25, 12:30 UT


-- 
Rainer Arlt  --  Astrophysikalisches Institut Potsdam -- www.aip.de
Visual Commission - International Meteor Organization -- www.imo.net
rarlt at aip.de --  phone: +49-331-7499-354  --  fax: +49-331-7499-526






 


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