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          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 |

rs`q CHART

No.1 : Plotted by Osada Kazuhiro. All meteors plotting.


No.2 : Plotted by Hashimoto Takema. Shower meteor only.


HOME