(meteorobs) IMO Shower Circ.: updated 2004 LEONIDS

[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, update

A total of 179 visual observing periods have been collected 
for the 2004 Leonid meteor shower. An updated activity pro-
file is given below. The data indicate a broad background 
component with ZHRs of the order of 20-30. More data will
be necessary to decide upon the significance of the ZHRs
above 30 near Nov 17, 22h UT and Nov 18, 23h UT.

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Date (UT)   Time  Solarlong   nINT   nLEO    ZHR
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Nov 08.971  23:18   226.834      8      3      7  +-  4
Nov 09.021  00:30   226.885      6      5      8  +-  3
Nov 12.208  04:60   230.089      5      8      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 16.862  20:41   234.778      9     51     17  +-  2
Nov 17.484  11:37   235.405      5     28      9  +-  2
Nov 17.916  21:59   235.841     20    120     36  +-  3
Nov 18.066  01:35   235.992     22     55     20  +-  3
Nov 18.420  10:05   236.349      5     30     12  +-  2
Nov 18.962  23:05   236.896     22    120     34  +-  3
Nov 19.073  01:45   237.008     25    100     28  +-  3
Nov 19.367  08:48   237.305     14    177     21  +-  2
Nov 19.826  19:49   237.768      5     22     20  +-  4
Nov 19.895  21:29   237.838      4     24     26  +-  5
Nov 20.010  00:14   237.954      8     33     25  +-  4
Nov 20.080  01:55   238.025      7     42     18  +-  3
Nov 20.800  19:12   238.751      2     16     22  +-  5
Nov 21.487  11:41   239.445      4      4      2  +-  1
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The activity profile is based on the observing periods by

  Alexandre Amorim (Brazil)
  Lars Bakman (Denmark)
  Ricardas Balciunas (Lithania)
  Pete Bias (USA)
  Andreas Buchmann (Switzerland)
  Vladimir Burgic (Serbia)
  Tibor Csorgei (Slovakia)
  Jelena Djuricin (Serbia)
  Robin Gray (USA)
  Takema Hashimoto (Japan)
  Robert Haver (Italy)
  Srdjan Keca (Serbia)
  Ralf Koschack (Germany)
  Rhishikesh Kulkarni (India)
  Peter van Leuteren (the Netherlands)
  Ming-hui Liang (China)
  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)
  Jens O. Olesen (Denmark)
  Carles Pineda Ferre (Spain)
  Jurgen Rendtel (Germany)
  Branislav Savic (Serbia)
  George Spalding (UK)
  Wesley Stone (USA)
  Ouyang Tianjing (China)
  Shigeo Uchiyama (Japan)
  Michel Vandeputte (Belgium)
  Quanzhi Ye (China)
  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.


Rainer Arlt, 2004 Nov 22, 9:30 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