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(meteorobs) Final IMO Press Release on 2000 Leonid Meteor Shower
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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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LEONID Activity 2000
-- final update --
Update on Nov 17/18 (American observations)
Preliminary results of Nov 18/19
--------------------
A word of thanks
----------------
First, I want to emphasize that this is the last update you
receive in connection with the IMO's 2000 Leonids Rapid
Communication Network. I wish to thank all observers who
made this endeavor possible. Most of them are acknowledged
below, but some may have been forgotten in the heat of the
battle against time to get these releases out as soon as
possible. Other observers sent their first reports too late
to be included, but also their efforts are appreciated. Now
that the general picture of the profile of the 2000 Leonid
Meteor Shower has been exhibited, the goal of this Network
has been achieved. Expect to see a more comprehensive first
analysis of the 2000 Leonid Meteor Shower in the December
issue of WGN, the Bimonthly Journal of the International
Meteor Organization. For that purpose, please send your full
observing reports as soon as possible to the IMO's Visual
Commission Director, Rainer Arlt. As this is the last release,
there is no need anymore to send "quick reports" to me!
Update
------
Since the last release, a few American observations
pertaining to Nov 17/18 have been added, as well as the
(few) observations we received pertaining to Nov 18/19. The
former do not change the picture sketched in our previous
release; the latter show the activity slowly fading away,
without any obvious unusual features.
With regard to the Nov 17/18 observations, the additional
data tend to lower some ZHRs slightly (the value for the Nov
18, 7h15m +/- 15m peak being lowered from about 450 to about
420, for example), but do not at all change the general
picture.
With regard to the scarce Nov 18/19 observations available
yet, neither Japanese, nor European, nor American data
indicate anything unusual. By Nov 18, 10h UT, Leonid ZHRs
reached the level before the rise to the Nov 18, 3h45m peak
again. Since then, they continued to drop to a level of 10
+/- 5 by Nov 19, 9h UT. It must be noted that not too much
importance should be attached at this point to the plateau
in the activity profile suggested by the table below between
Nov 18, 11h UT and Nov 19, 2h UT. As they are computed from
data from few different observers, the perception of an
individual observer can greatly influence the final result.
Despite a large scatter among individual observers' ZHR
values - not only because of differences in perception, but
also because of the disturbing Last Quarter Moon, the
influence of which on observations goes beyond what can be
taken into account by a reduction based on the stellar
limiting magnitude - the totality of the observations
exhibit a clear pattern explained in this and previous
releases. Because of the larger scatter, however, great care
remains necessary in further interpreting the observations!
The following observers have contributed data immediately
after the event, from which the ZHR profile given below
has been derived:
Birger Andresen, Rainer Arlt, Adrian Arquiola, Joseph
Assmus, Jure Atanackov, Felix Bettonvil, Neha Bhandari,
Lukasz Bielun, Lukas Bolz, Neil Bone, Michael Boschat,
Andreas Buchmann, Bill Burton, Christian Castillo, Asdai
Diaz, Susan Delaney, Marc de Lignie, Michael Doyle, Frank
Enzlein, Yuwei Fan, Magdalena Gawla, Petros Georgopoulos,
Roberto Gorelli, Lew Gramer, Robin Gray, Rosely Gregio,
Valentin Grigore, Rafael Haag, Wayne Hally, Roberto Haver,
Zoltan Hevesi, Ken Hodonsky,Ken Hodonsky, David Holman,
Tamas Hubay, Brigitte Humphries, Emmanuel Jehin, Kevin
Jones, Tomsilav Jurkic, Javor Kac, Primoz Kajdic, Akos
Kereszturi, Albert Kong, Wen Kou, John Krempasky, Vineet
Kulkarni, Zsolt Lantos, Ken Legal, Harry J. Lehto, Robert
Leyland, Mike Linnolt, Jerry Lodriguss, Hartwig Luethen,
Robert Lunsford, Pierre Martin, Jose A.R. Martins,
S. Maticic, Alastair McBeath, Norman W. McLeod III, Frank
J. Melillo, Huan Meng, H. Mikuz, Sirko Molau, Kiyohide
Nakamura, Piotr Nawalkowski, Michael Nezel, Eran Offek,
Dragana Okolic, Arkadiusz Olech, Kazuhiro Osada, Alexei
Pace, Arvid Parnajpye, Natasa Petelin, Ulhas Pradhan,
Szaniszlo Prohaszka, Mayuresh Prabhune, Nilesh
V. Puntambekar, Tushar Purohit, Janne Pyykkoe, Guo-ming Qin,
Francisco A. Rodriguez Ramirez, Gaurav Rathode, Gilberto
Klar Renner, Kulkarni Rhishikesh, Elaina Runge, Karl Runge,
Manuel S. Ruiz, Victor R. Ruiz, Carlos Saraiva, Hideko Sato,
Mikiya Sato, Tomoko Sato, Miguel A. Serra, Eini Shlomi,
Brian Shulist, Yuying Song, Bjoern Soerheim, Konrad Szaruga,
Richard Taibi, Kazumi Terakubo, Sanjay Thorat, Mihaela
Triglav, Josep Trigo, Arnold Tukkers, Varada Vaidya, Erwin
van Ballegoij, Vishnu Vardhan, George Varros, Cis Verbeeck,
Jean-Marc Wislez, Anna Witas, Jonderko Wojciech, Oliver
Wusk, Dan Xia, Karen Young, Ju Zhao, Jing Zhong, Jin Zhu,
Xiaojin Zhu, Kamil Zloczewski.
Mark Davis was instrumental in forwarding observations sent
to the Meteorobs mailing list.
Date Time (UT) Sol. long. Intervals Leonids ZHR +-
(2000.0)
---------------------------------------------------------
Nov 15 22h05m 243.848 2 11 13 4
Nov 16 03h33m 234.067 1 7 8 3
Nov 16 21h16m 234.820 6 44 20 3
Nov 17 3h02m 235.062 9 50 33 4
Nov 17 4h53m 235.141 10 74 47 5
Nov 17 6h00m 235.187 3 30 108 20
Nov 17 6h16m 235.198 3 16 66 17
Nov 17 6h36m 235.212 4 22 57 12
Nov 17 7h59m 235.270 10 117 104 10
Nov 17 9h25m 235.330 10 64 44 5
Nov 17 15h00m 235.565 7 74 50 6
Nov 17 19h22m 235.750 14 237 69 5
Nov 17 23h01m 235.903 9 164 102 8
Nov 18 00h27m 235.963 7 62 101 13
Nov 18 01h14m 235.995 15 170 161 12
Nov 18 01h47m 236.018 13 264 219 14
Nov 18 02h17m 236.040 25 496 211 10
Nov 18 02h45m 236.059 24 518 232 10
Nov 18 03h17m 236.082 31 668 236 9
Nov 18 03h46m 236.101 45 809 296 10
Nov 18 04h14m 236.121 41 827 247 9
Nov 18 04h45m 236.143 21 274 218 13
Nov 18 05h13m 236.163 17 454 225 11
Nov 18 05h44m 236.184 13 418 301 15
Nov 18 06h23m 236.212 17 401 286 14
Nov 18 07h12m 236.246 11 573 424 20
Nov 18 07h46m 236.270 20 500 354 16
Nov 18 08h16m 236.290 24 689 237 9
Nov 18 08h43m 236.310 17 229 148 10
Nov 18 09h18m 236.335 17 322 84 3
Nov 18 11h08m 236.411 13 169 41 3
Nov 18 18h06m 236.704 15 165 40 3
Nov 19 02h11m 237.044 11 52 36 5
Nov 19 08h37m 237.314 3 6 12 5
---------------------------------------------------------
ZHRs are computed with a population index of 2.0, zenithal
exponent of 1.0.
---
Marc Gyssens, 2000 November 19, 23h UT.
wgn@imodot net
---
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