No.2 : Plotted by Hashimoto Takema. Shower meteor only.
Some Giacobinid meteors appeared on Oct. 8, 1997.
Some Giacobinids shower appeared during 9h15m-15h(UT) on October 8 ,1997 in Japan. The peek of activity is ZHR=9.6+-6.5(Ls=195.21+-0.01) during 9h15m-11h(UT). Many meteor was vely slow and faint. but I can easy to distinguish between shower and others because of characteristic profeel. I observed Giacobinids in 1985. Giacobinids shower appeared in Japan. I don't think that the Giacobinids shower outburst before twilight in 1997. but I think that the Giacobinids shower appeared rather more than annual activity. Except comet returned, I don't know that these level activity observed. There are some usuful data as follows.
< Location >
IZUKI : Izumi Kiyoshi : 138d57'54" N, +36d35'24" E
ITODA : Ito Daiyu : 140d06' N, +36d17' E
OKAMA : Oka Masayuki : 140d48'18" N, +39d45'24" E
OSAKA : Osada Kazuhiro : 138d58' N, +35d20' E
: 138d57' N, +35d22' E
SATKO : Sato Koetsu : 140d54'37" N, +38d01'11" E
SATTO : Sato Tomoko : 138d43'42" N, +35d26'42" E
SATMI : Sato Mikiya : 138d43'42" N, +35d26'42" E
SIOHI : Shioi Hiroyuki : 139d17'42" N, +35d22'42" E
SIBYA : Shiba Yasuo : 134d50'01" N, +35d01'19" E
TERKA : Terakubo Kazumi : 138d43'42" N, +35d26'42" E
NOJYA : Nojima Yasumune : 139d10'47" N, +35d19'50" E
HASTA : Hashimoto Takema : 138d58'11" N, +35d37'39" E
HASTK : Hasegawa Takashi : 139d52' N, +35d48'30" E
FUYYO : Fuyube Yoshinori : 141d18' N, +40d13' E
MORAC : Morioka Astron. Cir.: 141d02' N, +39d44' E
YANSI : Yanagi Shin-ichiro : 139d43' N, +36d11' E
< Observation >
r=2.6
DATE UT Time Total spor GIA HR ZHR Lm CL RPh Dir Obs. Meth.
----------------------------------------------------------------------
Oct/19Oct. 1997
03 09:30-10:45 75 17 17 0 0.0 0.0 5.7 3 60 Z OSAKA V
05 09:30-10:30 60 13 13 0 0.0 0.0 5.5 2 60 Z OSAKA V
06 10:30-11:45 75 14 14 0 0.0 0.0 5.5 0 51 Z OSAKA V
07 10:30-12:00 90 27 26 0 0.0 0.0 5.7 2 49 Z OSAKA V
07 12:00-13:10 70 25 23 0 0.0 0.0 6.0 0 39 Z OSAKA V
08 09:15-10:00 45 19 14 5 6.7 21.0 5.5 0 61 Z OSAKA V
08 09:45-11:00 75 15 11 4 3.2 13.3 5.3 0 56 Dra HASTA V
08 09:45-11:00 75 2 1 1 0.8 5.5 5.0 2 57 Cyg IZUKI V
08 10:00-10:40 40 2 1 1 1.5 9.1 4.9 0 56 Z ITODA V
08 10:00-11:00 60 4 4 0 0.0 0.0 5.0 0 55 Z TERKA V
08 10:00-11:00 60 21 18 3 3.0 8.7 5.7 0 55 Z OSAKA V
08 10:30-11:00 30 0 0 0 - - 8.2 0 53 Dra HASTK TEL *1
08 11:00-12:00 60 7 6 1 1.0 4.6 5.4 0 47 Cyg HASTA V
08 11:00-12:00 60 2 2 0 0.0 0.0 5.5 0 47 Z SATTO V
08 11:00-12:15 75 30 29 0 0.0 0.0 5.8 0 46 Z OSAKA V
08 11:20-12:00 40 9 7 2 3.0 14.4 5.4 0 45 Z SIOHI V
08 11:30-12:30 60 4 3 1 1.0 6.9 5.1 0 42 Z ITODA V
08 12:00-12:50 50 3 2 0 0.0 0.0 5.0 0 39 Per YANSI V
08 12:00-13:00 60 4 3 1 1.0 4.9 5.6 0 38 Z SIOHI V
08 12:00-13:00 60 6 3 3 3.0 17.5 5.4 0 38 Cyg HASTA V
08 12:00-13:00 60 3 3 0 0.0 0.0 5.8 0 38 Z SATMI V
08 12:00-13:00 60 5 0 5 5.0 17.2 6.0 1 40 A MORAC V *2
08 12:00-13:00 60 1 1 0 0.0 0.0 5.0 1 38 Z NOJYA V
08 12:20-12:50 30 0 0 0 0.0 0.0 5.3 0 40 Z-W FUYYO V
08 12:25-13:00 35 2 2 0 0.0 0.0 5.6 4 37 Cyg SATKO V
08 13:00-13:40 40 4 4 0 0.0 0.0 5.3 0 32 Z ITODA V
08 13:00-14:00 60 9 7 2 2.0 13.4 5.6 0 30 Z SIOHI V
08 13:00-14:00 60 6 6 0 0.0 0.0 5.6 2 31 Lac SATKO V
08 13:00-14:00 60 0 0 0 0.0 0.0 5.9 0 30 Z TERKA V
08 13:00-14:00 60 10 6 4 4.0 18.3 6.0 1 32 A MORAC V *2
08 13:00-14:00 60 4 4 0 0.0 0.0 5.0 1 30 Z NOJYA V
08 13:20-14:00 40 4 4 0 0.0 0.0 5.4 0 31 Z-W FUYYO V
08 13:30-14:00 30 3 3 0 0.0 0.0 5.6 0 30 Cep HASTA V
08 14:00-15:00 60 11 9 2 2.0 19.7 5.6 0 23 Cep HASTA V
08 14:00-15:00 60 7 6 1 1.0 14.1 5.3 2 25 Z-W FUYYO V
08 14:30-15:55 85 12 10 0 0.0 0.0 5.0 0 18 Per YANSI V
08 16:00-17:00 60 7 3 0 0.0 0.0 6.0 0 11 Z SIBYA V
08 17:00-18:00 60 10 8 0 0.0 0.0 6.0 0 6 Z SIBYA V
09 10:30-11:30 60 14 14 0 0.0 0.0 5.3 2 50 Z OSAKA V
09 11:30-12:30 60 13 13 0 0.0 0.0 5.5 1 42 Z OSAKA V
09 14:00-15:00 60 6 5 1 1.0 7.2 5.8 0 25 Z-W FUYYO V
09 15:00-16:00 60 9 9 0 0.0 0.0 5.8 0 19 Z-W FUYYO V
10 10:05-11:05 60 9 7 2 2.0 16.5 4.6 0 55 Lac OKAMA V
10 12:00-13:20 80 10 10 0 0.0 0.0 5.2 1 36 Z OSAKA V
remarks
*1 : binocular(3x80mm)
*2 : group observation (6 persons)
Time : Observed time interval
Total: Total number of meteors
Spor.: Number of Sporadic meteors
GIA : Number of Giacobinids meteors
HR : Hourly rate
ZHR : Zenithal hourly rate
Lm : Limiting magnitude of field stars
CL : Cloud coverage
RPh : Radiant point height
Dir : Observation direction(Z: Zenithal direction ,W: West)
Obs. : Observer's name
Meth.: Observation Method(V: Visual ,TEL: Telescope)
* RP altitude used mean value of observed radiant point.
* Population index r used IMO's value of 2.6.
< time chart of Giacobinid meteor appearance >
18h 19 20 21 22 23 00
+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
HASTA 2 13 3 4 4 2 3 2
3
OSAKA 1 3 3 5 4 4
4 3
< Radiant points > --- --
No. DATE(UT) Name ƒ¿ ƒÂ N d Wt Vel Mag HR Obs. Meth.
---------------------------------------------------------------------
1. 1997/10/08.45 Ganma-Dra 272 +54 6 8 1 vS-rS 3.3 2.0 OSAKA V
2. 1997/10/08.47 Xi -Dra 271 +58 6 3 1 vS-S 2.7 2.1 HASTA V
N : Number of meteors
d : Diameter (deg)
Wt : Weight
Vel : Velocity (vS = very slow ,S=slow ,rS = rather Slow)
Mag : Mean magnitude
< Magnitude distribution >
(Oct. 8)
|Mag | -3 -2 -1 0 1 2 3 4 5 6 |Tatal| Ave | Lm | Obs. |
+-----+----------------------------------------+-----+-----+---------+-------+
|GIA | 0 0 0 0 1 3 4 2 - - | 10 | 2.7 | 5.3-5.6 | HASTA |
|Spor.| 0 0 1 1 1 3 16 10 - - | 32 | 2.9 | 5.3-5.6 | HASTA |
|GIA | 0 0 0 0 1 0 3 3 1 - | 8 | 3.4 | 5.5-5.8 | OSAKA |
|Spor.| 0 0 0 0 2 5 5 34 15 - | 61 | 3.9 | 5.5-5.8 | OSAKA |
|GIA | 0 0 1 0 3 1 2 2 - - | 8 | 3.4 | 5.8-6.0 | MORAC |
‚r‚s‚`‚q CHART
No.1 : Plotted by Osada Kazuhiro. All meteors
plotting.
No.2 : Plotted by Hashimoto Takema. Shower meteor only.