A total of 16536 Perseids is now comprised by 1567 individual observing periods as used for the analysis given below. A short-lived peak of activity was observed at 20h56m UT +-4 min on August 11, 2004. The precise moment was derived from various samplings of the data into averages, so it is not directly visible in the activity table below.
The time predicted by Esko Lyytinen was 20h54m, and it cannot be excluded that observers’ pre- judice has ‘helped’ match this forecast. The study of meteor timings on video recordings may clarify this. Any difference is most likely below 10 minutes though.
If we assume a background activity of 80-90 during the peak, we can derive the full width at half maximum (FWHM) to be about 55 minutes (20h25m – 21h20m).
Enhanced Perseid ZHRs were observed during the entire nights Aug 11/12 and 12/13. This is also in line with Esko’s comment that “because Jupiter lowers the ecliptic crossing radii in general this year, there may be enhanced general activity as well.”
------------------------------------------------------- Date (UT) Time Solarlong nINT nPER ZHR ------------------------------------------------------- Aug 9.2490 05:59 136.928 6 36 27 +- 4 Aug 11.054 01:18 138.659 20 228 34 +- 2 Aug 11.404 09:42 138.995 19 236 41 +- 3 Aug 11.726 17:25 139.304 26 193 68 +- 5 Aug 11.788 18:55 139.364 36 159 63 +- 5 Aug 11.824 19:47 139.398 45 240 85 +- 5 Aug 11.844 20:15 139.418 38 281 106 +- 6 Aug 11.852 20:27 139.425 34 274 161 +- 10 Aug 11.862 20:41 139.435 54 486 174 +- 8 Aug 11.865 20:46 139.438 51 412 176 +- 9 Aug 11.871 20:54 139.444 54 437 187 +- 9 Aug 11.877 21:03 139.449 72 665 185 +- 7 Aug 11.884 21:13 139.456 64 431 147 +- 7 Aug 11.891 21:23 139.463 66 490 134 +- 6 Aug 11.899 21:35 139.470 72 574 119 +- 5 Aug 11.909 21:49 139.480 104 581 94 +- 4 Aug 11.927 22:15 139.497 91 724 99 +- 4 Aug 11.949 22:47 139.518 87 640 82 +- 3 Aug 11.969 23:15 139.538 80 759 93 +- 3 Aug 11.991 23:47 139.559 59 690 105 +- 4 Aug 12.012 00:17 139.579 52 656 109 +- 4 Aug 12.032 00:46 139.598 59 763 125 +- 5 Aug 12.052 01:15 139.617 65 904 134 +- 4 Aug 12.073 01:45 139.637 46 671 127 +- 5 Aug 12.099 02:23 139.662 31 524 148 +- 6 Aug 12.163 03:55 139.724 37 465 98 +- 5 Aug 12.249 05:59 139.806 19 366 89 +- 5 Aug 12.319 07:39 139.874 29 1066 102 +- 3 Aug 12.390 09:22 139.942 14 562 118 +- 5 Aug 12.510 12:14 140.057 20 241 101 +- 6 Aug 12.726 17:25 140.264 21 294 110 +- 6 Aug 12.836 20:04 140.370 21 212 90 +- 6 Aug 12.876 21:01 140.408 20 344 84 +- 5 Aug 12.943 22:38 140.473 22 491 72 +- 3 Aug 13.120 02:53 140.643 15 230 47 +- 3 Aug 14.015 00:22 141.503 11 156 30 +- 2 Aug 15.417 10:00 142.850 7 55 10 +- 1 ------------------------------------------------------- r = 2.0; solar longitudes refer to J2000.0
If you have not yet submitted your observing report, it is still worth doing so as a final analysis will be done in early September.
If you have submitted preliminary data, please send your final report also very soon. Note that a break- down into small observing periods (5-min around the peak) is appreciated. Magnitude distributions of the Perseids should also be broken down into small periods, because short-lived features in the mass distribution of Perseid particles may be detected.
The current activity profile is based on the data by the following observers, to whom we are most grateful:
Maxim Andreev (Russia), Rainer Arlt (Germany), Joseph D. Assmus (USA), Morteza Azizi (Iran), Roberto Bacci (Italy), Lukas Bolz (Germany), Michael Boschat (Canada), Dustin Brown (USA), Andreas Buchmann (Switzerland), Jens Th. Carlsen (Denmark), Gu Chan (China), Danijela Cuic (Serbia), Zolfaqar Daneshi (Iran), Luigi D’Argliano (Italy), Sietse Dijkstra (the Netherlands), Dariusz Dorosz (Poland), Audrius Dubietis (Lithuania), Garry Dymond (Canada), Shlomi Eini (Israel), Frank Enzlein (Germany), Li Feng (China), Marek Fretala (Poland), Martin Galea de Giovanni (Malta), George W. Gliba (USA), Roberto Gorelli (Italy), Daniel Grun (Germany), Laszlo Gyarmati (Hungary), Amir Hasanzadeh (Iran), Takema Hashimoto (Japan), Jan Hattenbach (Germany), Roberto Haver (Italy), Davood Hemati (Iran), Veli-Pekka Hentunen (Finland), Zoltan Hevesi (Hungary), Kamil Hornoch (Czech Republic), Yandong Hu (China), Kaca Jankovic (Serbia), Carl Johannink (the Netherlands), Wojciech Jonderko (Poland), Paul Jones (USA), Piotr Kedzierski (Poland), Roy Keeris (the Netherlands), Soheil Khoshbinfar (Iran), Andre Knofel (Germany), Lukasz Kowalski (Poland), Dovile Kraulaidiene (Lithuania), Ralf Kuschnik (Germany), Dominika Lacheta (Poland), Marco Langbroek (the Netherlands), Anna Lemiecha (Poland), Peter van Leuteren (the Netherlands), Anna Levina (Israel), Mike Linnolt (USA), Shangfei Liu (China), Robert Lunsford (USA), Vladimir Lukic (USA), Hartwig Luthen (Germany), Christophe Marlot (France), Pierre Martin (Canada), Antonio Martinez (Venezuela), Felix A. Martinez (USA), Mikhail Maslov (Russia), Bert G. Matous (USA), Alastair McBeath (UK), Bruce McCurdy (Canada), Huan Meng (China), Koen Miskotte (the Netherlands), Sirko Molau (Germany), Robert Morgan (USA), Thom Morgan (USA), Norman W. McLeod (USA), Arash Nabizadeh Haghighi (Iran), Sven Nather (Germany), Arkadiusz Olech (Poland), Daniel van Os (the Netherlands), Anna Palasz (Poland), Bruce Patterson (Canada), Cedric Peinado (France), Karolina Pyrek (Poland), Hamid Rakooy (Iran), Jose Afonso dos Reis Martins (Portugal), Jurgen Rendtel (Germany), Petra Rendtel (Germany), Antonio Sasanski (Macedonia), Branislav Savic (Serbia), Maziar Seyed-Nezhad (Iran), Andrzej Skoczewski (Poland), Izabela Spaleniak (Poland), David Stine (USA), Enrico Stomeo (Italy), Wesley Stone (USA), Boris Stromar (Croatia), Cristina Tinta-Vass (Romania), Marko Toivonen (Finland), Shigeo Uchiyama (Japan), Michel Vandeputte (Belgium), Wei Wang (China), William W. Watson (USA), Oliver Wusk (Germany), Jiaqing Yang (China), Joseph Zammit (Malta), Ewa Zegler (Poland), Xu Zhang (China), Hao Zheng (China), Wen Zhou (China), Jurga Zieniute (Lithuania), Vladimir Znojil (Czech Republic)
The input is still going on; it is possible that your name will appear in a later phase of analysis.
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