(meteorobs) IMO Shower Circ.: Leonids 2004

[RainerArlt]

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           I M O   S h o w e r   C i r c u l a r
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                    LEONIDS 2004, VISUAL


The 2004 Leonids were not expected to show strong activity.
Yet predictions have been given by various authors for
encounters chiefly with the 8-revolution dust trail of
parent comet 55P/Tempel-Tuttle on November 19. Slight 
chances of activity enhancement were were found for the 
old 30-revolution dust trail on November 8.

Very few observations have been reported so far. An overview
of the results deduced from these observations is given 
in the table below.

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Date (UT)   Time  Solarlong   nINT   nLEO    ZHR
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Nov 8.9710  23:18   226.834      8      3      7  +-  4
Nov 9.0210  00:30   226.885      6      5      8  +-  3
Nov 12.097  02:20   229.978      4      7      4  +-  1
Nov 14.230  05:31   232.125      1      2    (13) +-  8
Nov 15.984  23:37   233.893      7     12      5  +-  1
Nov 16.916  21:59   234.832      5     25     20  +-  4
Nov 17.652  15:39   235.575     10     97     20  +-  2
Nov 18.513  12:19   236.443      7     52     16  +-  2
Nov 18.920  22:05   236.854      5     69     38  +-  5
Nov 19.235  05:38   237.172      6     23     13  +-  3
Nov 19.480  11:31   237.419      6    114     23  +-  2
Nov 19.970  23:17   237.914      4     15     16  +-  4
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At the moment, a broad background activity component is found
from the data. No clear peaks of activity are detected for
Nov 8 and Nov 19. Nevertheless, they may still be detected
from the full data set once it is utilized.

This tentative activity profile is based on the observing
periods by

  Alexandre Amorim (Brazil)
  Lars Bakman (Denmark)
  Ricardas Balciunas (Lithania)
  Pete Bias (USA)
  Andreas Buchmann (Switzerland)
  Robert Javer (Italy)
  Ralf Koschack (Germany)
  Peter van Leuteren (the Netherlands)
  Ming-hui Liang (China)
  Robert Lunsford (USA)
  Adam Marsh (Australia)
  Pierre Martin (Canada)
  Mikhail Maslov (Russia)
  Alastair McBeath (UK)
  Norman McLeod (USA)
  Jens O. Olesen (Denmark)
  Carles Pineda Ferre (Spain)
  Jurgen Rendtel (Germany)
  George Spalding (UK)
  Wesley Stone (USA)
  Michel Vandeputte (Belgium)
  Quanzhi Ye (China)
  Jin Zhu (China).

The solar longitudes refer to equinox J2000.0, ZHRs are
computed with a population index of r=2.0.


Rainer Arlt, 2004 Nov 21, 10:30 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