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(meteorobs) Shower Circular - Quadrantids 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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                       QUADRANTIDS 1998

The peak time of the Quadrantids is known be varying and could be
expected anywhere between solar longitudes 283.0 deg and 283.25 deg,
corresponding to 1998 Jan 03, 13h30 UT and 19h30 UT respectively.

It is not yet possible to derive an exact peak time; highest activity
occurred at 17h30 UT on January 3, at a solar longitude of 283.17 deg.
This time is close to the prediction in the 1998 IMO Shower Calendar
(283.16 deg). The activity profile shows a plateau-like maximum
structure, which has also been observed in previous years.

We would like to thank the following observers for their quick data
submission. Several observations were taken from the MeteorObs mailing
list, the Japanese observations were taken from the WWW homepage of
AMOTA, the Tokyo-area meteor observers.

Arlt Rainer (Germany)                       Rendtel Jurgen (Germany)
Bone Neil (UK)                              Rosenthal David (USA)
Gliba George W. (USA)                       Sato M. (Japan)
Hashimoto Takema (Japan)                    Seifert Harald (Germany)
Jyotirvidya Parisanstha Group (India)       Shioi H. (Japan)
Johannink Carl (the Netherlands)            Suzuki Mazafumi (Japan)
Kikuchi N. (Japan)                          Tanaka Syoiti (Japan)
Kobayashi K. (Japan)                        Terakubo K. (Japan)
Kuneth Werfried (Austria, obs. from Hawaii) Toda Masayuki (Japan)
Kuragaki K. (Japan)                         Wusk Oliver (Germany)
Luthen Hartwig (Germany)                    Yaguchi S. (Japan)
Osada Kazuhiro (Japan)                      Zay George (USA)

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Date  Time  Sollon #Obs ZHR  +-
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Jan 3 0030  282.45  4    16  10
      1100  282.90  5    32  13
      1600  283.12  9   102  44
      1730  283.17  8   133  48
      1830  283.22  7    93  30
      1930  283.26  8   123  34
      2130  283.34  7    66  25
Jan 4 0030  283.47  8    46  11
      0200  283.53  6    29   9
      0400  283.62  6    43  19
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Zenithal hourly rates (ZHR) were calculated with a population index
of 2.1, a zenith correction of 1/sin(hR), with hR being the radiant
height. Error bars are the standard deviation of the average.

Rainer Arlt, 1998 Januaray 7

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Visual Commission
International Meteor Organization
email:     visual@imodot net
Homepage:  http://www.imodot net
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