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 ƒÀAnd 15 +32 5 2.6 1 M-rR - 1.0 Maeda Koji V
162.298 1981/09/04.68 ƒÓAnd 20 +48 4 3 1 - - 2.0 Ueyama Yoshihiro V
163.296 1977/09/05.68 ƒÀAnd 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 ƒÁAnd 30 45 5 - 3 - - - - V
167.463 1945/09/09.77 Ari 33 20 4 - 1 - - - - V
168.368 1945/09/10.7 āPis 23 19 6 - 2 - - - - V
168.261 1970/09/11 12Tri 37 +29 4 - - - - - Minao Shinobu V
170.496 1983/09/13.63 ƒ¿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 āPer 42 45 12 - 4 - - - - V
175.039 1969/09/17.7 ƒÁAri 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 ƒ¿Ari 29 22 5 - 3 - - - - V
178.693 1931/09/21.7 ƒ¿Ari 28 22 8 - 4 - - - - V
Detail explanation of this shower, so-called "Aries-Triangulids" is "Meteor Showers" homepage by G.W.Kronk.