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(meteorobs) IMO-NEWS: Perseid Circular 1997
[Sure would have been nice to see my "GRALE" code in this night's
observations... Oh, well, maybe next year! -Lew, message forwarder]
------- Forwarded Message
Date: 14 Aug 97 16:55:19 EDT
From: Rainer Arlt <100114.1361@compuserve.com>
To: IMO-news <imo-news@imodot net>
Subject: Perseid Circular 1997
Message-Id: <970814205519_100114.1361_EHU78-1@CompuServe.COM>
Content-Length: 2547
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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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PERSEIDS 1997
The 1997 Perseid peak caused by the new filament of the Perseid
stream was predicted for 8h or 9h UT on August 12. Enhanced
activity was reported by several observers in North America,
significantly above the pre-traditional maximum levels, but
lower than in 1996. Highest rates occurred between 8h00 and
8h30 UT corresponding to a solar longitude of 139.70 deg (J2000).
The traditional maximum may have peaked over Asian longitudes
from where no data have been reported yet. Highest rates from
Europe were observed around 0h UT on August 13, at a solar longi-
tude of 140.57 deg being unusually late. Hence we may assume that
the true traditional maximum occurred in between the American and
European observing windows.
ARLRA Rainer Arlt (Germany)
GURPE Pete Gural (USA)
HEELA Lars Trygve Heen (Norway)
JOHCA Carl Johannink (Netherlands)
KUSRA Ralf Kuschnik (Germany)
LANMA Marco Langbroek (Netherlands)
LUNRO Robert Lunsford (USA)
MCLNO Norman McLeod (USA)
MISKO Koen Miskotte (Netherlands)
MOLSI Sirko Molau (Germany)
PETLA Petersen Lars (Denmark)
SOLMA Manuel Solano Riuz (Spain)
STOWE Wes Stone (USA)
UAA Umpqua Amateur Astronomers of Roseburg, OR (USA)
WILBA Barbara Wilson (USA)
ZAYGE George Zay (USA)
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1997
Aug UT #Obs #PER ZHR +-
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11 2100 5 132 60 24
11 2200 7 222 58 13
11 2300 6 258 62 19
12 0000 8 344 67 25
12 0130 7 347 74 17
12 0500 4 133 54 3
12 0700 4 121 70 7
12 0800 5 367 128 26
12 0900 7 631 116 47
12 1100 4 358 96 23
12 2130 7 178 66 10
12 2300 7 263 73 19
12 0000 5 256 101 24
12 0045 5 269 77 34
12 0130 5 230 83 27
12 1000 3 139 79 2
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ZHRs were calculated using a population index of r=2.0. The values given
are non-weighted averages of '#Obs' observing periods. ZHR errors '+-'
are the standard deviation of the average. Note that the ZHR bins are not
equidistant.
Many thanks to all observers who contributed so quickly to this first
activity overview. If you have not yet sent your Perseid logs, we would
be very grateful to receive your results.
Rainer Arlt, 1997 August 14.
- ---------------------------------
Visual Commission: visual@imodot net
IMO Website: http://www.imodot net
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