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(meteorobs) Detailed Draconid Report from Japan (fwd)



Below is a much more detailed report from the Nippon Meteor Society on the
October Draconid activity for October 8/9.  This one includes the average
numbers of shower meteors seen, in addition to the ZHR data.

The peak rate reported was an average of 55 GIA per hour, between 1300 and
1400 UTC, as averaged among their various observers active at that time.
The breakdown into 10 minute periods shows the highest rate at about 16
meteors per ten minute bin, from 1300 to 1320 UTC.  Note that the average
number seen in the 10 minute bin is not reported directly, but has been
multiplied by 6 to give an hourly rate of 96/94 for those time periods,
which is then applied to the ZHR formulae.

Also note that the report lists the total number of "Perseid" meteors seen,
which is probably a typo -- Giacobinid (October Draconid) is probably
intended.

** begin forwarded message (from IMO-News) ** 

Date: Sun, 11 Oct 1998 19:31:00 +0900
From: =?ISO-2022-JP?B?GyRCOWJNfCEhMm0+NBsoQg==?= <QGA00120@nifty.ne.jp>
Subject: Draconids in Japan : Preliminary results
To: imo-news@imodot net, peter@max.arc.nasadot gov

Visual results in Japan (The Nippon Meteor Society).
ZHR has been computed with: 
-  gamma = 1.0 (correction of Radiant elevation)
-  r = 2.6  (IMO Handbook for Visual Mereor Observers , Page 210)

(1) Hourly Result

-  excluding:observations under unfavourable condition
   (T<30m, Lm<4.0, Cl>0.4, RP-h<10deg)
----------------------------------------------------------------
    UT           JST      N   ave-HR(Dra) ZHR(Dra) SD  Remarks
----------------------------------------------------------------
Oct.8, 1998
09:00-10:00   8/9 18:30   4        7       41      21
10:00-11:00   8/9 19:30   7        7       35      19
11:00-12:00   8/9 20:30  14       13      105      45
12:00-13:00   8/9 21:30  18       24      304     133
13:00-14:00   8/9 22:30  25       55      585     319
14:00-15:00   8/9 23:30  20       14      230     135
15:00-16:00   8/9 00:30   8        3      156     123
16:00-17:00   8/9 01:30   1        2      140       -
----------------------------------------------------------------
Observers  (38members) :
  T.Hashimoto, I.Hatsukade, Ddot ito, K.Izumi, H.Izumimoto, Y.Kawai, 
  S.Kaya, I.Kisanuki, W.Kobayashi, K.Kuragaki, K.Maeda, K.Mameta, 
  T.Maruyama, K.Nakamura, Y.Nojima, K.Nozaki, H.Okayasu, K.Osada, 
  M.Sakaguchi, M.Sato, T.Sato, M.Takanashi, A.Takeda, S.Takeda, 
  K.Tanaka, Si.Tanaka, Sy.Tanaka, K.Terakubo, Y.Tonomura, T.Torigoe, 
  S.Uchiyama, S.Uehara, Y.Yabu, M.Yamamoto, S.Yanagi, S.Yoshida, 
  H.Yoshidome, S.Yoshino

Total observations              (Oct.8) : 4,636minutes (=77.27h)
Total number of Perseid meteors (Oct.8) : 1,862

(2) 10-Minutely Result    (11:00-15:00 UT)

-  excluding:observations under unfavourable condition
   (T<5m, Lm<4.0, Cl>0.4, RP-h<10deg)
----------------------------------------------------------------
    UT           JST      N   ave-HR(Dra) ZHR(Dra) SD  Remarks
----------------------------------------------------------------
11:00-11:10   8/9 20:05   3        2       13      23
11:10-11:20   8/9 20:15   4        2       12      23
11:20-11:30   8/9 20:25   5       17      147      34
11:30-11:40   8/9 20:35   5       13      126     143
11:40-11:50   8/9 20:45   5       18      165      86
11:50-12:00   8/9 20:55   5       17      211     120
12:00-12:10   8/9 21:05   8       18      218      97
12:10-12:20   8/9 21:15   8       20      248     111
12:20-12:30   8/9 21:25   8       21      265     166
12:30-12:40   8/9 21:35   8       31      412     201
12:40-12:50   8/9 21:45  12       61      530     304
12:50-13:00   8/9 21:55  14       64      614     280
13:00-13:10   8/9 22:05  13       96      943     595
13:10-13:20   8/9 22:15  15       94      904     565
13:20-13:30   8/9 22:25  15       64      616     437
13:30-13:40   8/9 22:35  16       42      483     223
13:40-13:50   8/9 22:45  15       26      307     197
13:50-14:00   8/9 22:55  13       30      371     227
14:00-14:10   8/9 23:05  10       25      325     145
14:10-14:20   8/9 23:15  11       14      196     143
14:20-14:30   8/9 23:25   9       16      230     188
14:30-14:40   8/9 23:35   4        8       90     110
14:40-14:50   8/9 23:45   2        9      224     110
14:50-15:00   8/9 23:55   2        9      239     114
---------------------------------------------------------------------
Observers  (23members) :
  T.Hashimoto, Ddot ito, H.Izumimoto, Y.Kawai, W.Kobayashi, K.Kuragaki, 
  K.Mameta, K.Nakamura, H.Okayasu, K.Osada, M.Sato, T.Sato, 
  M.Takanashi, A.Takeda, S.Takeda, Si.Tanaka, Sy.Tanaka, K.Terakubo, 
  S.Uchiyama, S.Uehara, Y.Yabu, S.Yanagi, S.Yoshino

Total observations              (Oct.8) : 2,340minutes (=39.00h)
Total number of Perseid meteors (Oct.8) : 1,402


 See The Nippon Meteor Society Web Page.
http://www2u.biglobe.ne.jp/~nms/index_e.html

--------------------------------------------------------------------
Masaaki Takanashi  (The Nippon Meteor Society / Gotemba city, JAPAN)
                      E-Mail : QGA00120@nifty.ne.jp
NMS-Web Page :  http://www2u.biglobe.ne.jp/~nms/index_e.html 
--------------------------------------------------------------------

A

** end of forwarded message **


James Richardson
Tallahassee, Florida

Operations Manager / Radiometeor Project Coordinator
American Meteor Society (AMS)
http://www.serve.com/meteors/


References: