Triangulids was detected again!


The meteor shower activity was observed at Triangulum on September 12 and 15, 1998 in Japan. K.Osada plotted 9 shower meteors from Triangulum on September 12 and M.Sakaguchi plotted 6 shower meteors from there on September 15. I think that it was probably the same activity of Triangulids which was observed on September 12, 1993 in America (Sky and Telescope, October 1994).


Observers : 
  Osada Kazuhiro   : OSAKA
  Sakaguchi Mitsue : SAKMI
  Satou Koetsu     : SATKO

Observation Period :
  September 12 - 16, 1998.

Observation site:
  OSAKA : Oyama, Shizuoka, Japan                 E:139.0 deg , N:35.3 deg
  SAKMI : Higashi-Hiroshima, Hiroshima, Japan    E:132.6 deg , N:34.5 deg
  SATKO : Watari, Watari, Miyagi, Japan          E:140.9 deg , N:54.6 deg

Observation method:
  visual , plotting

Observational Data:
                                 Sep.
      DATE(UT)  TIME Total Spor. Per Psc Tri Lm  CL Dir Obs.
  -----------------------------------------------------------
  Sep.
  12 14:15-15:15 60    31   24    5   2   5  5.8  0  Z  OSAKA
  12 15:15-16:30 75    29   22    5   2   4  5.8  0  Z  OSAKA
  15 14:30-15:30 60    23   16    -   1   6  5.2  0 Tri SAKMI
  16 16:00-17:00 60    10    9    1   0   1  6.0  0 Tri SATKO
  16 17:00-17:40 40     9    8    1   0   1  5.8  0 Per SATKO

  TIME    : Observed time interval
  Total   : Total number of meteors
  Spor.   : Sporadic meteors
  Sep.Per : September Perseids
  Psc     : Piscids
  Tri     : Triangulids
  Lm      : Limiting magnitude of field stars
  CL      : Cloud cover
  Dir     : Observation direction(Z : Zenith)

Radiant point:
  No. Date(UT) R.P name R.A Dec  N  d Wt Vel  Mag   HR Obs.  Method
  -----------------------------------------------------------------
   1 09/12.64  Beta-Tri  28 +33  9  3  3 M-R  4.4  4.0 OSAKA V(P)
   2 09/15.63 Alpha-Tri  26 +26  6  2  1 rR-R 4.5  6.0 SAKMI V(P)

  N      : Number of meteors
  d      : Diameter of R.P.
  Wt     : Weight(P,1-5  P : poor)
  Mag    : Mean Magnitude
  Vel    : Velosity(M-R  : from moderate to rapid)
                (rR-R : from rather rapid to rapid)
  Method : V:Visual, P:Plotting

Time chart of Triangulids appearance on Sept. 12. (Observed by Osada)
  14h(UT)                                      15h            15h
  15m  20   25   30   35   40   45   50   55   00m  05   10   15m
  +----+----+----+----+----+----+----+----+----+----+----+----+
   5 4                    4   5               5
  15h                                          16h                    16h
  15m  20   25   30   35   40   45   50   55   00m  05   10   15   20 25 30m
  +----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+
                 5              4                       4    4

  Note) Numeric character is magnitude.


Search for NMS radiant point database with following requirements.
  [requirements] 1928-1998, 9/2-22, 13 <=alpha<= 43, 18 <=delta<= 48, N>=4

  Ls      Date(UT)      R.P name R.A Dec  N  d Wt Vel   Mag  HR  Obs.                 Method
  ------------------------------------------------------------------------------------------
  160.909 1983/09/03.76    And  15 +32  5  2.6 1 M-rR   -  1.0 Maeda Koji           V
  162.298 1981/09/04.68    And  20 +48  4  3   1 -      -  2.0 Ueyama Yoshihiro     V
  163.296 1977/09/05.68    And  20 +33  4  4   P -      -   -  Ito Mamoru           V
  166.176 1969/09/08.60    47And  23  39  6  -     -      -   -  -                    V
  167.550 1932/09/09.53    And  30  45  5  -   3 -      -   -  -                    V
  167.463 1945/09/09.77      Ari  33  20  4  -   1 -      -   -  -                    V
  168.368 1945/09/10.7     Pis  23  19  6  -   2 -      -   -  -                    V
  168.261 1970/09/11       12Tri  37 +29  4  -   - -      -   -  Minao Shinobu        V
  170.496 1983/09/13.63    Ari  30 +25  5  5   P M      -   -  Mameta Katsuhiko     V
  170.583 1988/09/13         Ari  41 +26  4  -   - rR-R   -   -  Kashiwabara Tomoharu V
  175.382 1936/09/17.6     Per  42  45 12  -   4 -      -   -  -                    V
  175.039 1969/09/17.7     Ari  26  19  5  -     -      -   -  -                    V
  176.120 1996/09/18.73      Ari  38 +24  4  8   P rR-vR 3.8 4.0 Osada Kazuhiro       V
  176.816 1965/09/19.5       And  34  39  4  -   F -      -   -  -                    V
  177.043 1961/09/19.7        -   31  22  4  -     -      -   -  -                    V
  177.716 1931/09/20.7     Ari  29  22  5  -   3 -      -   -  -                    V
  178.693 1931/09/21.7     Ari  28  22  8  -   4 -      -   -  -                    V


Detail explanation of this shower, so-called "Aries-Triangulids" is "Meteor Showers" homepage by G.W.Kronk.

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