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(meteorobs) Fwd: IMO Lyrid Circular
Forwarded:
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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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LYRIDS 1998
This year's Lyrid activity turned out to be of normal level.
A plateau of ZHRs between 15 and 19 was observed between solar
longitudes 32.0 and 32.8 deg. Highest rates were observed from
American longitudes at 32.0 deg, yet without any significance.
Note the sudden increase of activity before the maximum. The
decrease after the plateau is not covered by data.
We would like to thank the following observers for their quick
submission of observational reports:
BAKLA Lars Bakman (Denmark)
BETFE Felix Bettonvil (Netherlands)
BALPE Petra Rendtel (Germany)
DAVMA Mark Davis (USA)
GERCH Christoph Gerber (Germany)
HOSDA David Hostetter (USA)
HUZRI Richard Huziak (Canada)
LACSY Sylvio Lachmann (Germany)
LANMA Marco Langbroek (Netherlands)
LUNRO Robert Lunsford (USA)
MISKO Koen Miskotte (Netherlands)
MOLSI Sirko Molau (Germany)
RENJU Jurgen Rendtel (Germany)
SCHTH Thomas Schreyer (Germany)
SEIHA Harald Seifert (Germany)
SHUBR Brian Shulist (Canada)
VANER Erwin van Ballegoij (Netherlands)
ZAYGE George Zay (USA)
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Date Time Sollon #Obs. ZHR (r=2.9)
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Apr 20 0006 29.746 13 2.7 +- 3.2
Apr 20 1540 30.384 12 2.5 +- 2.2
Apr 20 2350 30.717 8 2.8 +- 2.2
Apr 21 0140 30.791 11 5.3 +- 6.6
Apr 21 0900 31.086 11 5.3 +- 7.0
Apr 21 2130 31.594 8 6.4 +- 3.8
Apr 22 0120 31.750 7 5.8 +- 3.7
Apr 22 0300 31.820 9 8.6 +- 7.1
Apr 22 0700 31.985 14 17.6 +- 8.0
Apr 22 0830 32.043 13 18.6 +- 6.5
Apr 22 2150 32.587 5 14.6 +- 7.7
Apr 22 2220 32.608 11 17.3 +- 7.0
Apr 22 2230 32.612 10 16.3 +- 6.4
Apr 23 0010 32.682 13 17.4 +- 5.3
Apr 23 0340 32.819 11 15.8 +- 7.1
Apr 23 2320 33.620 2 2.0 +- 0.4
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Times are in UT, solar longitudes refer to J2000.0, #Obs is the number
of individual ZHRs involved in the average, the error is the standard
deviation. A constant population index of r=2.9 was used.
Rainer Arlt, 1998 May 04.