As an update of the first preliminary analysis of the 2004 Perseids based on visual observations, this is a refined graph with almost 500 observing periods.
The peak time of the 1-revolution dust trail pre- dicted by Lyytinen can be narrowed down to the period 20:45 UT to 21:10 UT. This encloses the predicted time of 20:54 UT on August 11. A plateau- like maximum of 20-25 minutes duration has not changed anymore after adding the last 100 observing periods. The activity level was ZHR=170.
The traditional maximum is not yet well covered. The dip of ZHR=75 may not be significant since systematical errors may exceed the given statistical error greatly (very small number of observers).
Until now, the following observers contribute to the curve (forgive me if you are missing; I am working on):
Rainer Arlt (Germany), Roberto Bacci (Italy), Lukas Bolz (Germany), Michael Boschat (Canada), Dustin Brown (USA), Sietse Dijkstra (the Netherlands), Audrius Dubietis (Lithuania), Daniel Grun (Germany), Amir Hasanzadeh (Iran), Takema Hashimoto (Japan), Jan Hattenbach (Germany), Andre Knofel (Germany), Dovile Kraulaidiene (Lithuania), Ralf Kuschnik (Germany), Marco Langbroek (the Netherlands), Peter van Leuteren (the Netherlands), Mike Linnolt (USA), Robert Lunsford (USA), Vladimir Lukic (USA), Hartwig Luthen (Germany), Christophe Marlot (France), Felix A. Martinez (USA), Mikhail Maslov (Russia), Bruce McCurdy (Canada), Huan Meng (China), Sirko Molau (Germany), Thom Morgan (USA), Norman W. McLeod (USA), Sven Nather (Germany), Daniel van Os (the Netherlands), Jurgen Rendtel (Germany), Petra Rendtel (Germany), Eini Shlomi (Israel), Shigeo Uchiyama (Japan), Oliver Wusk (Germany), Jurga Zieniute (Lithuania)
------------------------------------------------------- Date (UT) Time Solarlong nINT nPER ZHR ------------------------------------------------------- Aug 11.353 08:28 138.946 6 137 37 +- 3 Aug 11.723 17:21 139.301 10 120 86 +- 8 Aug 11.780 18:43 139.356 11 69 71 +- 8 Aug 11.834 20:01 139.408 12 69 122 +- 15 Aug 11.850 20:24 139.423 19 136 154 +- 13 Aug 11.860 20:38 139.433 18 139 128 +- 11 Aug 11.865 20:46 139.438 22 141 176 +- 15 Aug 11.872 20:56 139.445 20 146 165 +- 14 Aug 11.879 21:06 139.451 27 197 173 +- 12 Aug 11.886 21:16 139.458 22 112 118 +- 11 Aug 11.893 21:26 139.465 24 114 105 +- 10 Aug 11.900 21:36 139.471 18 129 105 +- 9 Aug 11.909 21:49 139.480 33 101 63 +- 6 Aug 11.928 22:16 139.498 28 218 81 +- 5 Aug 11.949 22:47 139.518 24 224 83 +- 6 Aug 11.969 23:15 139.538 29 348 95 +- 5 Aug 11.991 23:47 139.559 26 334 109 +- 6 Aug 12.012 00:17 139.579 19 219 103 +- 7 Aug 12.033 00:48 139.599 24 336 121 +- 7 Aug 12.053 01:16 139.618 20 304 132 +- 8 Aug 12.079 01:54 139.643 22 339 128 +- 7 Aug 12.210 05:02 139.769 8 123 75 +- 7 Aug 12.347 08:20 139.901 12 683 110 +- 4 Aug 12.495 11:53 140.043 11 88 103 +- 11 ------------------------------------------------------- r = 2.0 was assumed, solar longitudes refer to J2000.0.
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