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(meteorobs) IMO Shower Circ: eta-Aquarids 2000 (II)
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To: imo-news@egroups.com
From: Rainer Arlt <rarlt@aipdot de>
Date: Thu, 18 May 2000 10:35:13 +0200 (METDST)
Subject: [IMO-News] IMO Shower Circ: eta-Aquarids 2000 (II)
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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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Eta-AQUARIDS 2000 -- II
The large number of observing reports coming in after the
first Shower Circular about the eta-Aquarids allowed an
update of the activity graph. The shower appears to exhibit
a period of about three days with ZHRs above 50. The data
set does not allow to conclude about the fluctuations; yet
the broad maximum and the maximum ZHR of ~60 are a clear
result of this preliminary compilation based on the reports
of the following observer:
ATAJU Jure Atanackov (Slovenia)
BUCAN Andreas Buchmann (Switzerland)
CERJA Jakub Cerny (Czech Republic)
COOTI Tim Cooper (South Africa)
DAVMA Mark Davis (USA)
DIAAS Asdai Diaz Rodriguez (Cuba)
HOLDA David Holman (USA)
JOHCA Carl Johannink (the Netherlands)
KONKH Khalil Konsul (Jordan)
KOUWE Wen Kou (China)
LANMA Marco Langbroek (the Netherlands)
LINMI Mike Linnolt (USA)
MARAD Adam Marsh (Australia)
MARPI Pierre Martin (Canada)
MATMI Michael Matiazzo (Australia)
MCLAL Alex M'clintock (Spain)
MISKO Koen Miskotte (the Netherlands)
MOLSI Sirko Molau (Germany, from Jordan)
MOSSC Scott Moser (USA)
MOTER Erick Mota Perez (Cuba)
NATSV Sven Nather (Germany, from Morocco)
NITMI Mirko Nitschke (Germany, from Jordan)
TELKH Khaled M. Tell (Jordan)
YOUKI Kim Youmans (USA)
- --------------------------------------------
Date Time (UT) Sol. nETA nObs <ZHR> +-
- --------------------------------------------
Apr 29 1800 39.71 1 2 2.4 1.7
Apr 30 1740 40.67 18 4 18 4.1
Apr 01 2210 41.82 34 5 28 4.6
Apr 03 0050 42.90 33 4 36 6.1
Apr 04 0520 44.05 15 4 36 8.9
Apr 04 1820 44.58 17 5 54 13
Apr 05 0040 44.84 64 8 65 8.0
Apr 05 1330 45.35 86 6 48 5.2
Apr 06 0140 45.84 105 11 56 5.4
Apr 06 0840 46.13 35 7 35 5.9
Apr 06 1610 46.43 119 6 51 4.7
Apr 07 0630 47.01 61 8 38 4.8
Apr 08 0630 47.98 57 4 60 7.8
Apr 10 0210 49.73 23 4 24 5.0
Apr 11 0120 50.67 4 2 26 12
- --------------------------------------------
Solar longitudes refer to equinox J2000. Average times are given with
10-minute accuracy though often refer to many hours coverage. The
average ZHR was computed by <ZHR> = sum n / sum(Teff/C) where Teff is
the effective observing time, C is the total correction according to
limiting magnitude, possible field obstruction and radiant elevation
as sin(hR). The ZHR refers to a limiting magnitude of +6.5 and a
radiant elevation of 90 degrees. nETA is the number eta-Aquarids seen,
nObs is the number of observing periods contributing to the average;
the number of individual observers is smaller in most of the cases.
- --
Rainer Arlt, 2000 May 18
Visual Commission - International Meteor Organization -- www.imodot net
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