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(meteorobs) IMO-NEWS: 2nd IMO Circular: PER 1997
------- Forwarded Message
Date: Tue, 2 Sep 1997 11:37:02 -0400
From: Rainer Arlt <arlt@compuserve.com>
Subject: 2nd IMO Circular: PER 1997
To: IMO-news <imo-news@imodot net>
-------------------------------------
I M O S h o w e r C i r c u l a r
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PERSEIDS 1997 -- Second Information
After the first circular a rush of observations coming in has
made it worthwhile to give another overview of the 1997 Perseid
maximum activity. We are very grateful to all the 95 observers
from 18 countries who sent in their observations so quickly.
The first Perseid peak is distinct with a maximum ZHR of about 150
at a solar longitude of 139.71 to 139.72 degrees. The peak is skew
with a steeper increase than decrease.
The traditional Perseid maximum is still not represented in this
graph; Japanese observers reported highest rates at 14h UT on August 12,
corresponding to a solar longitude of 139.93 degrees.
Regarding the traditional maximum, E.P. Bus (Netherlands) reported=0D
highest radio rates around 18h UT on August 12. The number of reflec-=0D
tions was almost twice as high as at 17h and 19h UT. He did not cover=0D
the period around 14h UT. A slight increase of visual activity was=0D
observed at about 23h30 UT, August 12, solar longitude 140.31 degrees,=0D=
with ZHRs about 30% above the general trend.=0D
=0D
The following observers contributed to the ZHR profile below:=0D
=0D
ABDSA Sana'a Abdo (Jordan) MANTI Tijana Mancic (Yugoslavia)=0D=
ALNAH Ahmad Alniamat (Jordan) MARJO Jose dos Reis Martins (Portug=
al)=0D
ARLRA Rainer Arlt (Germany) MCLNO Norman McLeod (USA)=0D
BAJAL Bajc Alja (Slovenia) MILAN Ana Milovanovic (Yugoslavia)=0D=
BANAN Ana Bankovic (Yugoslavia) MILIR Iris Miljacki (Yugoslavia)=0D=
BETFE Felix Bettonvil (Netherlands) MILNI Nikola Milutinovic (Yugoslavi=
a)=0D
BONNE Neil Bone (UK) MIOVJ Vjera Miovic (Yugoslavia)=0D
BOZNE Nenad Bozinovic (Yugoslavia) MISKO Koen Miskotte (Netherlands)=0D=
CAJMA Marija Cajetinac (Yugoslavia) MOLSI Sirko Molau (Germany)=0D
CEKMI Milan Cekic (Yugoslavia) NEDSA Sasa Nedeljkovic (Yugoslavia)=
=0D
COTUR Uros Cotar (Slovenia) NIKDA Dalibor Nikolic (Yugoslavia)=0D=
DALHA Hani Dalee (Jordan) ODEMO Mohammad Odeh (Jordan)=0D
DE MA Marc de Lignie (Netherlands) ODWIB Ibrahim Odwan (Jordan)=0D
DENDE Denda Dejana (Yugoslavia) OLEAR Arkadiusz Olech (Poland)=0D
DJOMI Milos Djordjevic (Yugoslavia) OREAR Artjom Oreshonok (Belarus)=0D=
DONIV Ivan Donik (Slovenia) PANAN Andres Panos (Spain)=0D
ENZFR Frank Enzlein (Germany) PAVTA Tamara Pavlovic (Yugoslavia)=0D=
FERRA Raul Fernandez (Spain) PETLA Petersen Lars (Denmark)=0D
FODTA Tamas Fodor (Hungary) PETNA Natasa Petelin (Slovenia)=0D
FRIAN Andrea Friebel (Germany) POPMI Mila Popovic (Yugoslavia)=0D
GELMA Marcel Geltner (USA) RENAN Andreas Rendtel (Germany)=0D
GORRO Roberto Gorelli (Italy) RENIN Ina Rendtel (Germany)=0D
GURPE Pete Gural (USA) RENJU Juergen Rendtel (Germany)=0D
HADGA Gabi Koschny (Germany) RUDMA Marion Rudolph (Germany)=0D
HADMU Muammar Hadidi (Jordan) SARKR Krisztian Sarneczky (Hungary)=
=0D
HAVRO Roberto Haver (Italy) SCHMC Michael Schmidhuber (Germany)=
=0D
HEELA Lars Trygve Heen (Norway) SCURE Rene Scurbecq (Belgium)=0D
HEMAL Alaa Hemsy (Jordan) SLAVE Vesna Slavkovic (Yugoslavia)=0D=
HIRAN Anti Hirv (Estonia) SOLMA Manuel Solano Ruiz (Spain)=0D=
HRIST Stanka Hribar (Slovenia) STOEN Enrico Stomeo (Italy)=0D
HUZRI Richard Huziak (Canada) STOST Stefano Stomeo (Italy)=0D
JAAHE Helle Jaaniste (Estonia) STOWE Wes Stone (USA)=0D
JOHCA Carl Johannink (Netherlands) TELKH Khaled Tell (Jordan)=0D
KACJA Javor Kac (Slovenia) TOTTA Tamas Toth (Hungary)=0D
KECSR Srdjan Keca (Yugoslavia) TREMA Manuela Trenn (Germany)=0D
KERAK Akos Kereszturi (Hungary) TRIGA Gabrijela Triglav (Slovenia)=0D=
KNOAN Andre Knoefel (Germany) TRIMI Mihaela Triglav (Slovenia)=0D=
KONKH Khalil Konsul (Jordan) UAA Umpqua Amat.Astr.Roseburg, OR=
(USA)=0D
KOSDE Detlef Koschny (Germany) VANAA Anne van Weerden (Netherlands=
)=0D
KOSRA Ralf Koschack (Germany) VANER Erwin van Ballegoij (Netherla=
nds)=0D
KREAL Alenka Kremzer (Slovenia) VERSU Suzana Veren (Slovenia)=0D
KUDGY Gyongyver Kudor (Hungary) VUCMA Marija Vucelja (Yugoslavia)=0D=
KUSRA Ralf Kuschnik (Germany) WAGBR Bruno Wagner (Germany)=0D
LANMA Marco Langbroek (Netherlands) WAGGE Georg Wagner (Germany)=0D
LUNRO Robert Lunsford (USA) WESTH Thomas Westphal (Germany)=0D
LUTHA Hartwig Luethen (Germany) WILBA Barbara Wilson (USA)=0D
MAJSZ Szabolcs Majnik (Hungary) WITGU Gudrun Witzler (Germany)=0D
ZAYGE George Zay (USA)=0D
- -------------------------------=0D
1997 Time Sollong=0D
Aug (UT) (J2000) #Obs ZHR +-=0D
- -------------------------------=0D
11 2108 139.25 28 44 8=0D
11 2215 139.30 40 53 8=0D
11 2315 139.34 42 53 8=0D
12 0015 139.38 36 50 8=0D
12 0115 139.42 42 57 9=0D
12 0215 139.46 21 64 14=0D
12 0315 139.50 4 52 26=0D
12 0430 139.55 4 46 23=0D
12 0615 139.62 7 77 29=0D
12 0700 139.65 5 72 32=0D
12 0730 139.67 11 98 30=0D
12 0800 139.69 6 117 48=0D
12 0830 139.71 11 155 47=0D
12 0900 139.73 6 140 57=0D
12 0930 139.75 9 100 33=0D
12 1000 139.77 6 112 46=0D
12 1030 139.79 5 99 44=0D
12 1115 139.82 11 94 28=0D
12 2000 140.17 7 79 30 Only observations Teff<0.9h:=0D
12 2115 140.22 15 72 19 Time Solarlong #Obs ZHR=0D
12 2215 140.26 25 70 14 2250 140.28 5 63+-28=0D
12 2315 140.30 33 73 13 ---\ 2315 140.30 11 80+-24=0D
13 0015 140.34 33 74 13 ---/ 2345 140.32 12 91+-26=0D
13 0115 140.38 32 69 12 0015 140.34 10 63+-20=0D
13 0215 140.42 21 77 17=0D
13 0430 140.51 3 61 35=0D
13 0745 140.64 5 53 24=0D
13 1020 140.74 14 68 18=0D
- -------------------------------=0D
=0D
The individual ZHRs are calculated with a population index r=3D2.0=0D
and a zenithal exponent of 1.0. The time is the middle of an averaging=0D=
bin, the solar longitude given belongs to this time and is for J2000.=0D
The error is derived from the size of the ZHR sample by +-=3DZHR/sqrt(#Ob=
s).=0D
#Obs is the number of individual ZHRs contributing to the average.=0D
=0D
=0D
Rainer Arlt, 1997 September 2.=0D
- ---------------------------------=0D
Visual Commission: visual@imodot net=0D
IMO Website: http://www.imodot net=0D
=0D
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