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(meteorobs) IMO Shower Circ.: PER 1998
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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 1998
A full Moon on August 8 interfered heavily with the Perseid maximum.
Despite these unfavourable conditions, a considerable number of
observers contributed quickly either directly to the Visual Com-
mission or to any of the mailing lists. Japanese data were partly
taken from the internet home page of the AMOTA.
The fresh peak in the Perseid activity graph, observed since 1988,
fell on Japanese geographical longitudes this year. The scatter in
the data at that time is extremely large and correction factors
very high. We give only a rough estimate of the peak ZHR here
indicating that the peak is still present with no less than its
1997 strength. The traditional maximum of the Perseids occurred
at sol=139.9--140.0 degrees with ZHR=80.
Sana'a Abdo (ABDSA) Primoz Kajdic (KAJPR) Natasa Petelin (PETNA)
Zaid Abdullah (ABDZA) Vaclav Kalas (KALVA) Pavel Platos (PLAPA)
Iyad Ahmad (AHMIY) Veiko Kask (KASVE) Jurgen Rendtel (RENJU)
Ziad Al-Khatieb (ALKZI) Tarek Katbeh (KATTA) Mitsue Sakaguchi (SAKMI)
Ahmad Al-Niamat (ALNAH) Kenya Kawabata (KAWKE) Koetu Sato (SATKO)
Ibrahim Al-Sabban (ALSIB) Ylo Kestlane (KESYL) Manuel Solano (SOLMA)
Jose Alvarellos (ALVJO) Ales Kratochvil (KRAAL) Jiri Srba (SRBJI)
Rainer Arlt (ARLRA) Lukas Kral (KRALU) Niko Stritof (STRNI)
Ivo Babarovic (BABIV) Maris Kuperjanov (KUPMA) Pavel Svozil (SVOPA)
Lars Bakmann (BAKLA) Marco Langbroek (LANMA) Idgrid Tago (TAGID)
Michal Bares (BARMC) Endriko Leks (LEKEN) Khaled Tell (TELKH)
Nikola Biliskov (BILNI) Hartwig Luthen (LUTHA) Manuela Trenn (TREMA)
Emil Brezina (BREEM) Kouji Maeda (MAEKO) Gabrijela Triglav (TRIGA)
Jens J. Carlsen (CARJE) Miroslava Mala (MALMI) Mihaela Triglav (TRIMI)
Ales Cesen (CESAL) Katuhiko Mameta (MAMKA) Anne van Weerden (VANAE)
Hani Dalee (DALHA) Pierre Martin (MARPI) Ivaylo Videv (VIDIV)
Ivanka Getsova (GETIV) Petr Masek (MASPE) Jaroslav Vosahlik (VOSJA)
George Gliba (GLIGE) Alastair McBeath (MCBAL) Marija Vucelja (VUCMA)
Valentin Grigore (GRIVA) Rossitsa Miteva (MITRO) Roland Winkler (WINRO)
Michal Haltuf (HALMI) Sirko Molau (MOLSI) Oliver Wusk (WUSOL)
Yahia Hamed (HAMYA) Ivelina Momcheva (MOMIV) Ilkka Yrjola (YRJIL)
Takema Hashimoto (HASTA) Sven Nather (NATSV) Jan Zacios (ZACJA)
Ala'a Hemsy (HEMAL) John Newton (NEWJO) Jure Zakrajsek (ZAKJU)
Anti Hirv (HIRAN) Mohammad Odeh (ODEMO) Jan Zavitski (ZAVJA)
Amera Hjeaj (HJEAM) Ibrahim Odwan (ODWIB) George Zay (ZAYGE)
Tomas Hynek (HYNTO) Arkadiusz Olech (OLEAR) Irena Zivkovic (ZIVIR)
Helle Jaaniste (JAAHE) Artyom Oreshonok (OREAR)
Carl Johannink (JOHCA) Kazuhiro Osada (OSAKA)
Javor Kac (KACJA) Urska Pajer (PAJUR)
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Date (UT) Sollong PER ZHR +-
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Jul 24 0200 121.031 5 4.4 1.8
Jul 24 1900 121.701 11 4.2 1.2
Jul 25 1500 122.503 17 4.8 1.1
Jul 26 0100 122.892 8 5.0 1.7
Jul 28 0700 125.024 3 5.6 2.8
Jul 30 0100 126.722 32 8.7 1.5
Jul 30 1700 127.358 45 7.4 1.1
Jul 31 0800 127.960 27 6.3 1.2
Aug 01 1200 129.059 22 6.8 1.4
Aug 03 0100 130.545 30 11.3 2.0
Aug 03 0500 130.701 27 8.9 1.7
Aug 04 0100 131.491 7 7.1 2.5
Aug 10 2210 138.090 22 14.2 3.0
Aug 11 2050 138.997 35 31.7 5.3
Aug 12 1010 139.529 29 54.3 9.9
Aug 12 1430 139.704 88 200? ---
Aug 12 2030 139.946 82 80.8 8.9
Aug 12 2130 139.984 125 76.1 6.8
Aug 13 0000 140.086 106 67.5 6.5
Aug 13 0050 140.120 76 65.9 7.5
Aug 13 0130 140.144 44 62.9 9.4
Aug 13 0920 140.455 11 29.6 8.6
Aug 13 2320 141.016 123 41.2 3.7
Aug 14 1200 141.511 32 30.6 5.3
Aug 15 2300 142.906 7 10.0 3.5
Aug 17 0700 144.187 10 8.4 2.5
Aug 18 1700 145.558 10 6.2 1.9
Aug 19 0800 146.190 13 6.6 1.8
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All solar longitudes refer to equinox 2000.0; a constant population
index of r=2.5 was adopted. PER is the number of Perseids inolved.
Rainer Arlt, 1998 September 3.
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