May alpha-Bootids appeared again on May 23, 2000.


May alpha-Bootids was observed by Osada, Sakaguchi and Sumie on May 23, 2000. This shower appeared on May 30, 1970 and on May 23, 1998 in Japan. It was appeared after 2 years. There are some usuful data as follows.


<Observation Site>
AKASE (Akagi, Seiji)        : Ryuten Obs., Yoshii, Okayama, Japan.       134d00mE , +34d53mN
HASTA (Hashimoto, Takema)   : Shimoyugi, hachioji, Tokyo, Japan          139d22mE , +35d38mN    24/25,25/26
                              Mt. Momokura, Ohtsuki, Yamanashi, Japan    138d58mE , +35d38mN    3/4
JOHCA (Johannink, Carl.F.)  : Gronau, Germany.                             7d01mE , +52d13mN
KODHI (Kodama, Hiroyuki)    : Yamada, Otaru, Hokkaido, Japan.            140d00mE , +43d11mN    10/11,17/18,18/19,20/21,24/25
                              Omotai, Otaru, Hokkaido, Japan.            140d58mE , +43d14mN    30/31
OGAHI (Ogawa, Hiroshi)      : Mt.Ashio, Makabe, Ibaraki                  140d09mE , +36d16mN
OSAKA (Osada, Kazuhiro)     : Oyama, Shizuoka, Japan.                    138d59mE , +35d21mN
SAKMI (Sakaguchi, Mitsue)   : Saijyo, Hirosima, Japan.                   132d45mE , +34d22mN
SATKO (Sato, Koetsu)        : Zaoh, Miyagi, Japan.                       140d29mE , +38d08mN    26/27
                              Yamamoto, Miyagi, Japan.                   140d55mN , +37d57mN    29/30
SATMI (Sato, Mikiya)        : Shimosuwa, Nagano, Japan.                  138d08mE , +36d05mN
SUMKA (Sumie, Kazuhiro)     : Yashiro, Hyogo, Japan.                     135d04mE , +34d56mN    23/24,29/30
                              Chikusa, Hyogo, Japan                      134d24mE , +35d13mN    24/25,25/26
                              Nishiharima Obs., Sayoh, Okayama, Japan    134d21mE , +35d01mN    28/29

<Observation>
DATE       UT         JST     TIME Total Spor. MAB THE SAG other Lm CL Dir Obs.  Method
----------------------------------------------------------------------------------------
May/2000
10/11 12:32-13:14 21:32-22:14  42     0    0    0   -   -    -   4.8 0 Boo KODHI TV P R64 filter + 24mmF1.4 + I.I
17/18 11:29-14:52 20:29-23:52 212     5    5    0   -   -    -   4.7 0 Boo KODHI TV P R64 filter + 24mmF1.4 + I.I , *1 min interrupt.
18/19 11:09-13:12 20:09-22:12 123     3    3    0   -   -    0   4.6 0 Boo KODHI TV P R64 filter + 24mmF1.4 + I.I
20/21 11:48-13:50 20:48-22:50 122     4    2    1   -   -    1   4.7 0 Boo KODHI TV P R64 filter + 24mmF1.4 + I.I
22/23 12:00-13:30 21:00-22:30  90    15   15    0   -   0    0   4.7 2  Z  OSAKA V  P
23/24 11:20-12:00 20:20-21:00  40     9    9    0   -   -    -   5.3 0  Z  SUMKA V  C
23/24 12:00-13:00 21:00-22:00  60    23   16    5   -   1    1   5.7 0  Z  OSAKA V  P
23/24 12:00-13:00 21:00-22:00  60    20   16    4   -   -    -   5.6 0 Boo SUMKA V  C
23/24 12:00-13:00 21:00-22:00  60     6    6    0   -   0    0   5.4 0  Z  AKASE V  P
23/24 13:00-14:00 22:00-23:00  60    24   17    5   -   1    1   5.7 0  Z  OSAKA V  P
23/24 13:00-14:00 22:00-23:00  60    23   21    2   -   -    -   5.7 0  Z  SUMKA V  C
23/24 13:00-14:10 22:00-23:10  70     9    7    1   -   0    1   5.4 0  Z  AKASE V  P
23/24 13:05-14:05 22:05-23:05  60    12    8    4   -   0    0   6.0 1 Boo SAKMI V  P
23/24 14:00-15:00 23:00-00:00  60    23   17    3   -   1    2   5.5 0  Z  OSAKA V  P
23/24 14:00-14:40 23:00-23:40  40    16   16    -   -   -    -   5.6 1  Z  SUMKA V  C
24/25 11:00-12:00 20:00-21:00  60    22   17    1   -   -    2   5.5 1  Z  OSAKA V  P
24/25 11:30-12:00 20:30-21:00  30    20   17    3   -   -    -   6.6 0 Boo SUMKA V  C
24/25 11:39-13:41 20:39-22:41 122     6    4    1   -   -    1   4.9 0 Boo KODHI TV P R64 filter + 24mmF1.4 + I.I
24/25 11:50-13:00 20:50-22:00  70    12   10    2   -   0    0   5.9 0  Z  AKASE V  P
24/25 12:00-13:00 21:00-22:00  60    23   17    2   -   1    1   5.5 0  Z  OSAKA V  P
24/25 12:00-13:00 21:00-22:00  60    37   31    6   -   -    -   6.7 0 Boo SUMKA V  C
24/25 13:00-14:00 22:00-23:00  60    24   22    1   -   0    1   5.5 0  Z  OSAKA V  P
24/25 13:00-14:00 22:00-23:00  60    44   36    8   -   -    -   6.8 0 Boo SUMKA V  C
24/25 13:00-14:00 22:00-23:00  60    12    9    1   -   1    1   6.1 0  Z  AKASE V  P
24/25 13:40-14:40 22:40-23:40  60     3    3    0   -   -    0   4.7 0  Z  YOSKA V  P
24/25 14:00-15:00 23:00-00:00  60    46   40    6   -   -    -   6.8 0  Z  SUMKA V  C
24/25 14:00-15:00 23:00-00:00  60     6    4    1   -   0    1   6.1 0  Z  AKASE V  P
24/25 14:30-15:30 23:30-00:30  60     7    4    1   0   1    1   4.5 0 Boo HASTA V  C
24/25 15:00-16:00 00:00-00:50  50    31   26    5   -   -    -   6.4 0  Z  SUMKA V  C
25/26 11:50-13:00 20:50-22:00  60     6    4    2   -   0    0   5.9 0  Z  AKASE V  P  *10 min interrupt.
25/26 12:00-13:00 21:00-22:00  60    45   37    8   -   -    -   6.7 0 Boo SUMKA V  C
25/26 12:00-13:00 21:00-22:00  60     5    4    0   -   -    1   4.8 0  Z  YOSKA V  P
25/26 13:00-14:00 22:00-23:00  60    45   39    6   -   -    -   6.8 0  Z  SUMKA V  C
25/26 13:00-13:50 22:00-22:50  50     7    5    0   -   2    0   6.0 0  Z  AKASE V  P
25/26 13:00-14:00 22:00-23:00  60     4    2    1   -   -    1   4.8 0  Z  YOSKA V  P
25/26 14:00-14:30 23:00-23:30  30    25   21    4   -   -    -   6.8 1  Z  SUMKA V  C
25/26 14:00-15:00 23:00-00:00  60     8    4    3   0   1    0   4.5 0 Boo HASTA V  C  *3 meteors appeared during 2 minuts.
25/26 14:00-15:00 23:00-00:00  60     3    3    0   -   -    0   5.2 0  Z  YOSKA V  P
25/26 14:00-15:20 23:00-00:20  80    13   12    0   -   1    0   5.5 2  Z  OSAKA V  P
25/26 14:00-15:00 23:00-23:40  40     4    2    1   -   0    1   5.7 0  Z  AKASE V  P
25/26 22:24-23:30              66     9    8    -   1   -    -   6.0 0 Dra JOHCA V  P
25/26 23:30-00:30              60     8    8    -   0   -    -   6.0 0 Dra JOHCA V  P
25/26 15:30-16:55 23:30-00:55  65    41   41    -   -   -    -   6.7 2  Z  SUMKA V  C  *20 min interrupt.
26/27 13:30-14:30 22:30-23:30  60     4    4    0   -   0    0   5.2 4 Boo SATKO V  P
26/27 13:40-14:50 22:40-23:50  70     4    2    2   -   -    -   3.5 4  Z  OGAHI V  P
26/27 14:00-15:00 23:00-00:00  60    13   12    1   -   0    0   5.3 1  Z  OSAKA V  P
26/27 15:00-16:00 00:00-01:00  60    16   13    1   -   1    1   5.3 1  Z  OSAKA V  P
26/27 16:00-17:00 01:00-02:00  60    13   13    0   -   0    0   5.5 1  Z  OSAKA V  P
28/29 11:00-12:00 20:00-21:00  60    27   26    0   -   -    1   6.0 0  Z  OSAKA V  P
28/29 12:00-12:45 21:00-21:45  45    13   13    -   -   -    -   6.0 3  Z  SUMKA V  C
28/29 12:00-13:00 21:00-22:00  60    26   26    0   -   0    0   6.0 1  Z  OSAKA V  P
28/29 13:00-13:45 22:00-22:45  45     5    4    0   0   0    1   4.8 0 Boo HASTA V  C
28/29 13:00-14:00 22:00-23:00  60    28   27    0   -   1    0   5.8 1  Z  OSAKA V  P
28/29 13:00-14:00 22:00-23:00  60    20   18    2   -   -    -   5.9 2  Z  SUMKA V  C
28/29 14:00-15:00 23:00-00:00  60    33   28    5   -   -    -   6.4 0  Z  SUMKA V  C
28/29 15:00-16:00 00:00-01:00  60    38   32    6   -   -    -   6.5 0  Z  SUMKA V  C
28/29 16:00-16:50 01:00-01:50  50    27   27    -   -   -    -   6.3 2  Z  SUMKA V  C
28/29 17:15-18:15 02:15-03:15  60    17   17    0   -   0    0   5.5 1  Z  OSAKA V  P
29/30 11:40-13:00 20:40-22:00  80    23   23    -   -   -    -   5.9 3  Z  SUMKA V  C
29/30 12:00-13:00 21:00-22:00  60    30   20    2   -   1    1   6.1 1  Z  OSAKA V  P
29/30 13:00-14:00 22:00-23:00  60    33   29    4   -   -    -   6.2 2  Z  SUMKA V  C
29/30 13:00-14:00 22:00-23:00  60    31   23    2   -   1    2   6.0 0  Z  OSAKA V  P
29/30 13:20-14:00 22:20-23:00  40     5    5    0   -   0    0   5.9 0 Boo SATKO V  P
29/30 14:00-15:00 23:00-00:00  60    33   29    4   -   -    -   6.3 1  Z  SUMKA V  C
29/30 14:00-15:00 23:00-00:00  60     9    9    0   -   0    0   5.9 0 Her SATKO V  P
29/30 14:00-15:20 23:00-00:20  80    42   35    2   -   0    2   6.0 1  Z  OSAKA V  P
29/30 15:00-16:00 00:00-01:00  60    34   32    2   -   -    -   6.3 0  Z  SUMKA V  C
29/30 16:00-17:00 01:00-02:00  60    36   36    -   -   -    -   6.4 0  Z  SUMKA V  C
29/30 17:00-18:00 02:00-03:00  60    34   34    -   -   -    -   6.4 0  Z  SUMKA V  C
29/30 22:24-23:47              85    12   12    -   0   0    -   6.0 0 Dra JOHCA V  P
30/31 12:00-13:00 21:00-22:00  60    16   16    0   -   0    0   5.5 2  Z  OSAKA V  P
30/31 13:09-14:34 22:09-23:34  85     7    6    0   -   0    1   6.1 0 Boo KODHI TV P R64 filter + 24mmF1.4 + I.I
30/31 13:15-14:00 22:15-23:00  45     2    1    1   -   -    0   4.8 0  Z  KODHI V  P
30/31 14:05-15:35 23:05-23:35  30     1    1    0   -   -    0   4.7 0  Z  KODHI V  P
30/31 16:45-18:15 01:45-03:15  90    20   20    0   -   0    0   5.3 2  Z  OSAKA V  P
Jun/2000
01/02 11:30-12:30 20:30-21:00  30     4    4    0   -   -    0   5.6 0  Z  SATMI V  P
01/02 12:00-13:00 21:00-22:00  60    25   25    0   -   0    0   5.8 0  Z  OSAKA V  P
01/02 13:00-14:00 22:00-23:00  60    28   27    0   -   1    0   5.8 0  Z  OSAKA V  P
01/02 14:00-15:00 23:00-00:00  60    27   26    0   -   1    0   5.7 0  Z  OSAKA V  P
01/02 17:00-18:15 02:00-03:15  75    13   13    0   -   0    0   5.3 1  Z  OSAKA V  P
01/02 22:42-23:30              48     6    6    -   0   0    -   6.0 0 Dra JOHCA V  P
01/02 23:30-00:22              52     6    6    -   0   0    -   6.0 0 Dra JOHCA V  P
02/03 11:45-13:00 20:45-22:00  75    18   18    0   -   0    0   5.3 2  Z  OSAKA V  P
03/04 12:15-13:30 21:15-22:30  75    17   17    0   -   0    0   5.5 2  Z  OSAKA V  P
03/04 17:00-18:15 02:00-03:15  75    18   16    0   -   0    2   5.3 2  Z  OSAKA V  P
03/04 17:35-18:25 02:35-03:25  50     9    8    0   0   0    1   5.3 0 Her HASTA V  P
03/04 18:15-18:35 03:15-03:35  20     7    6    0   -   0    1   4.7 1  Z  OSAKA V  P
04/05 14:55-15:55 23:55-00:55  60    30   19    0   -   4    7   6.3 0 Her SAKMI V  P
04/05 17:00-18:15 02:00-03:15  75    35   33    0   -   0    2   6.2 0  Z  OSAKA V  P
04/05 18:15-18:35 03:15-03:35  20    10    7    0   -   0    3   5.0 0  Z  OSAKA V  P
05/06 13:00-14:00 22:00-23:00  60    24   23    0   -   1    0   5.7 1  Z  OSAKA V  P
05/06 14:00-15:00 23:00-00:00  60    27   26    0   -   1    0   5.7 1  Z  OSAKA V  P
05/06 17:00-18:15 02:20-03:15  55    24   21    0   -   0    3   5.7 1  Z  OSAKA V  P
05/06 18:15-18:35 03:15-03:35  20    10    6    0   -   0    5   5.0 1  Z  OSAKA V  P
06/07 11:30-13:00 20:30-22:00  90    30   30    0   -   0    0   5.6 1  Z  OSAKA V  P
06/07 14:30-15:30 23:30-00:30  60     6    4    -   1   1    0   4.8 0 Her HASTA V  P
06/07 17:00-18:15 02:00-03:15  75    34   28    0   -   0    2   5.8 1  Z  OSAKA V  P
06/07 18:15-18:35 03:15-03:35  20    11    5    0   -   0    5   5.0 1  Z  OSAKA V  P
07/08 11:00-12:00 20:00-21:00  60    13   13    0   -   0    0   5.3 0  Z  OSAKA V  P
07/08 12:00-13:10 21:00-22:10  70    17   17    0   -   0    0   5.5 1  Z  OSAKA V  P
07/08 16:45-18:15 01:45-03:15  90    42   33    0   -   1    4   6.0 1  Z  OSAKA V  P
07/08 18:15-18:35 03:15-03:40  25    11    6    0   -   0    5   4.8 1  Z  OSAKA V  P
07/08 22:15-23:15              60     9    9    -   -   0    -   6.1 0 Dra JOHCA V  P
07/08 23:15-00:30              75    10    9    -   -   1    -   6.0 0 Dra JOHCA V  P
08/09 22:54-23:45              51     8    8    -   0   -    -   6.0 0 Dra JOHCA V  P
08/09 23:45-00:32              47     9    7    -   2   -    -   6.1 0 Dra JOHCA V  P

Time : Observed time interval
Total: Total number of meteors
Spor.: Number of Sporadic meteors
MAB  : Number of May Alpha-Bootids meteors
THE  : Number of Tau-Herculids meteors (associated with comet 73P/Schwassmann-Wachmann 3)
HR   : Hourly rate
Lm   : Limiting magnitude of field stars
CL   : Cloud coverage
Dir  : Observation direction ( Z = Zenith )
Meth.: Method (V = Visual, C = Counting, P = Plotting, TV = TV, S = Single station)

<Magnitude distribution>
     |-3  -2  -1   0   1   2   3   4   5   6| All| Ave|  Lm   | Obs.
-----+--------------------------------------+----+----+-------+-----
23/24
MAB  |                             9   4    |  13|4.31|5.5-5.7| OSAKA
Spor.|                     3  10  24   9    |  46|3.85|5.5-5.7| OSAKA
MAB  |                 1       1   4        |   6|3.33|5.6-5.7| SUMKA
Spor.|                     4  18  36   4    |  62|3.65|5.3-5.7| SUMKA
24/25
MAB  |                         1   2   1    |   4|4.00|5.5    | OSAKA
Spor.|                     2   8  30  16    |  56|4.07|5.5    | OSAKA
MAB  |                     1       6  17   4|  28|4.82|6.4-6.8| SUMKA
Spor.|             2   3   6  19  56  57   7| 150|4.15|6.4-6.8| SUMKA
25/26
MAB  |                     1       2   9   6|  18|5.06|6.7-6.8| SUMKA
Spor.|         1   1   2   7  15  52  55   7| 140|4.18|6.5-6.8| SUMKA
28/29
MAB  |                     1   2   6   4    |  13|4.00|5.9-6.5| SUMKA
Spor.|         1   2   4   6  21  47  35   2| 118|3.84|5.9-6.5| SUMKA
29/30
MAB  |                             1   5    |   6|4.83|6.0-6.1| OSAKA
Spor.|                 1      14  46  17    |  78|5.00|6.0-6.1| OSAKA
MAB  |                             6   4    |  10|4.40|6.2-6.3| SUMKA
Spor.|     1       1   4  14  35  78  50    | 183|3.81|5.9-6.4| SUMKA

<Radiant point>
No.    YMD(UT)     CONST  R.A DEC  N d Wt Vel   Mag  HR Obs.  Remarks
---------------------------------------------------------------------
1 2000/05/23.56 Alpha-Boo 210 +17 13 6  3 S-M   4.3 4.3 OSAKA Ploting
2 2000/05/23.56 Ryo-  Boo 213 +30  4 2  1 rS-rR 4.0 1.3 OSAKA Ploting
3 2000/05/23.56 Alpha-Boo 213 +24  4 3  P S-rS  3.8 4.0 SAKMI Ploting
4 2000/05/24.56 Alpha-Boo 211 +18  4 5  1 S-rS  4.0 1.3 OSAKA Ploting
5 2000/05/24.56 Alpha-Boo 212 +16  4 1  P vS-M  3.5 1.3 AKASE Ploting
6 2000/05/25.55 Alpha-Boo 213 +16  3 2  P S-rS  3.7 1.2 AKASE Ploting
7 2000/05/29.57 Ryo-  Boo 215 +30  4 2  1 rS-rR 4.5 1.2 OSAKA Ploting
8 2000/05/29.57 Alpha-Boo 218 +18  6 5  1 rS-M  4.8 1.8 OSAKA Ploting

N    : Number of using meteors for Radiant
d    : Diameter (deg)
Vel  : Velocity (vS = Very Slow, S = Slow, rS = Rather Slow, M = Moderate
                 rR = rather Rapid, R = Rapid, vR = Very Rapid)
Mag  : Mean magnitude

Time Chart of May alfa-Bootids observed by Osada, Sakaguchi and Sumie.
These numbers under the time are Magnitude of meteor.

<23/24>
 12h(UT)                                                    13h
 00m 05   10   15   20   25   30   35   40   45   50   55   00m
 +----+----+----+----+----+----+----+----+----+----+----+----+
 S        5                  54             4            4       OSAKA

 13h                                                        14h
 00m 05   10   15   20   25   30   35   40   45   50   55   00m
 +----+----+----+----+----+----+----+----+----+----+----+----+
     4        5        5                  4                      OSAKA
                                          4

 14h                                                        15h
 00m 05   10   15   20   25   30   35   40   45   50   55   00m
 +----+----+----+----+----+----+----+----+----+----+----+----+
          4              4                    4              E   OSAKA

<24/25>
 11h                                                        12h
 00m 05   10   15   20   25   30   35   40   45   50   55   00m
 +----+----+----+----+----+----+----+----+----+----+----+----+
 S                             S         5  5           5       SUMKA

 12h                                                        13h
 00m 05   10   15   20   25   30   35   40   45   50   55   00m
 +----+----+----+----+----+----+----+----+----+----+----+----+
       4               4              6        6 54             SUMKA

 14h                                                        15h
 00m 05   10   15   20   25   30   35   40   45   50   55   00m
 +----+----+----+----+----+----+----+----+----+----+----+----+
          4    5 5             5   5  6           5         5   SUMKA

 15h                                                        16h
 00m 05   10   15   20   25   30   35   40   45   50   55   00m
 +----+----+----+----+----+----+----+----+----+----+----+----+
                   5       5 5       6             5      5     SUMKA

 16h                                                        17h
 00m 05   10   15   20   25   30   35   40   45   50   55   00m
 +----+----+----+----+----+----+----+----+----+----+----+----+
       5   4         5  4       2                  E

<25/26>
 12h                                                        13h
 00m 05   10   15   20   25   30   35   40   45   50   55   00m
 +----+----+----+----+----+----+----+----+----+----+----+----+
 S2       6            5    5       54         64              SUMKA

 13h                                                        14h
 00m 05   10   15   20   25   30   35   40   45   50   55   00m
 +----+----+----+----+----+----+----+----+----+----+----+----+
           5  6  5                           6         5  6    SUMKA

 14h                                                        15h
 00m 05   10   15   20   25   30   35   40   45   50   55   00m
 +----+----+----+----+----+----+----+----+----+----+----+----+
              5  6       5   5 E                               SUMKA

<28/29>
 13h                                                        14h
 00m 05   10   15   20   25   30   35   40   45   50   55   00m
 +----+----+----+----+----+----+----+----+----+----+----+----+
 S                         4                             4     SUMKA

 14h                                                        15h
 00m 05   10   15   20   25   30   35   40   45   50   55   00m
 +----+----+----+----+----+----+----+----+----+----+----+----+
 4                                   2  5        4          5  SUMKA

 15h                                                        16h
 00m 05   10   15   20   25   30   35   40   45   50   55   00m
 +----+----+----+----+----+----+----+----+----+----+----+----+
   4           3     4            4                 3  5     E SUMKA
 
<29/30>
 13h                                                        14h
 00m 05   10   15   20   25   30   35   40   45   50   55   00m
 +----+----+----+----+----+----+----+----+----+----+----+----+
 S                    4       5           5             5      SUMKA

 14h                                                        15h
 00m 05   10   15   20   25   30   35   40   45   50   55   00m
 +----+----+----+----+----+----+----+----+----+----+----+----+
                              4    5             4      4      SUMKA

 15h                                                        16h
 00m 05   10   15   20   25   30   35   40   45   50   55   00m
 +----+----+----+----+----+----+----+----+----+----+----+----+
        4                                               4    E SUMKA

Note)Numeric character is magnitude.
     S:start
     E:end

HR Chart


STAR CHART
No.1 : Plotted by Osada, Kazuhiro. All meteors plotting.

No.2 : Plotted by Sakaguchi, Mitsue. All meteors plotting.

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