Results of the IMO Video Meteor Network - June 2004
===================================================
The Juni Bootids were the highlight of the previous month. This minor shower
experienced an unexpected outburst in 1998 with a maximum ZHR of 100, but
was almost not noticable in the following years. Based on numerical models,
enhanced rates were predicted for 2004, namely in the intervall 10 to 19 UT on
June 23.
In the night of June 22/23, three central European observers had part or full
time clear skies, and in the following night two observers. A first inspection
of the data yielded clear activity of the June Bootids on June 22/23, but
almost no more Bootids in the following night:
Observing Time (UT) t_eff Camera Obs. # Meteors
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06/22 20:19 - 06/23 02:11 5.9h MINCAM1 MOLSI 2 JBO 7 SPO
06/22 21:04 - 06/23 01:45 5.7h KAYAK1 SLAST 4 JBO 14 SPO
06/22 21:39 - 06/23 01:51 4.2h AKM1 MOLSI 3 JBO 14 SPO
06/23 00:15 - 06/23 01:15 1.0h MINCAM2 STRJO 2 JBO 1 SPO
06/23 20:37 - 06/24 02:11 5.6h MINCAM1 MOLSI 1 JBO 14 SPO
06/23 21:27 - 06/24 01:51 4.4h AKM1 MOLSI 1 JBO 20 SPO
06/23 21:47 - 06/23 22:45 1.0h KAYAK1 SLAST 0 JBO 3 SPO
----------------------------------------------------------------------
Hence, maximum activity occured on June 22/23. Remarkable is the fact, that
the Bootids were not evenly distributed in time, but that there was enhanced
activity between 23:50 and 00:30 UT. Seven of the overall eleven June Bootids
were recorded in that short time interval:
Observing Time (UT) # Meteors
----------------------------------------------
06/22 20:30 - 06/22 21:00 0 JBO 3 SPO
06/22 21:00 - 06/22 21:30 0 JBO 2 SPO
06/22 21:30 - 06/22 22:00 0 JBO 2 SPO
06/22 22:00 - 06/22 22:30 1 JBO 2 SPO
06/22 22:30 - 06/22 23:00 0 JBO 3 SPO
06/22 23:00 - 06/22 23:30 1 JBO 4 SPO
06/22 23:30 - 06/23 00:00 2 JBO 8 SPO
06/23 00:00 - 06/23 00:30 6 JBO 2 SPO
06/23 00:30 - 06/23 01:00 0 JBO 2 SPO
06/23 01:00 - 06/23 01:30 1 JBO 8 SPO
----------------------------------------------
A first IMO analysis of visual observations showed increased rates starting
in the evening of June 22, whereas the maximum was reached at mid-day of
June 23 with ZHRs up to 50. A peak at the above mentioned time was (not yet)
confirmed. Anyway, both observations are another excellent proof of the power
of dust trail modelling.
Otherwise, June was a dull month. Due to the mediocre weather and short nights,
the effective observing time decreased to a low of little above 300 hours.
On the other hand, meteor activity slightly increased in comparison to May,
such that the overall meteor count improved somewhat. It's a god sign for the
end of the annual "dry period" for meteor observers.
1. Observers
============
Code Name Place Camera FOV LM Nights Time Meteors
--------------------------------------------------------------------------------
EVAST Evans Moreton RF1 (1.2/12) 20 dg 4 mag 3 10.1 h 31
KACJA Kac Kostanjevec METKA (0.8/8) 42 dg 2 mag 8 43.0 h 43
MOLSI Molau Seysdorf AKM1 (0.85/25) 32 dg 6 mag 16 57.6 h 148
MINCAM1 (1.4/12) 35 dg 4 mag 18 72.2 h 101
SLAST Slavec Ljubljana KAYAK1 (1.8/28) 50 dg 4 mag 17 66.1 h 156
STRJO Strunk Leopoldshoehe MINCAM2 (0.8/8) 42 dg 4 mag 19 43.9 h 105
MINCAM3 (0.8/6) 55 dg 3 mag 4 8.1 h 19
UEBST Ueberschaer Aachen MIMO (0.95/25) 13 dg 4 mag 5 20.1 h 17
--------------------------------------------------------------------------------
Sum 27 321.1 h 620
2. Observing Times (h)
======================
June 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15
--------------------------------------------------------------------------------
EVAST - - - - - 3.4 - - - - - - - - -
KACJA - - - - - 5.2 5.1 5.4 - - - - - 5.9 5.8
MOLSI - - - - - 5.3 5.4 5.3 2.5 - - - 3.2 1.7 -
- - - - - 6.3 5.7 6.0 1.0 - - - 3.5 2.5 -
SLAST 4.6 3.4 - - - 5.8 4.7 4.9 4.0 2.9 - - - 2.6 -
STRJO 4.2 3.1 1.7 - 3.9 3.9 3.1 0.5 - - 3.7 - 2.3 2.1 0.5
- - - - - - 2.4 - - - - - - 3.4 -
UEBST 3.9 - - - - 3.9 - 3.8 - - - - - - -
--------------------------------------------------------------------------------
Sum 12.7 6.5 1.7 - 3.9 33.8 26.4 25.9 7.5 2.9 3.7 - 9.0 18.2 6.3
June 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
--------------------------------------------------------------------------------
EVAST - - 3.1 - - - - - - - - 3.6 - - -
KACJA - - - - - - - - - 3.4 6.1 - - 6.1 -
MOLSI 5.0 1.8 - - 3.2 - 4.2 4.4 4.2 1.7 - - 5.4 2.9 1.4
5.7 1.6 1.9 - 5.9 - 5.9 5.6 2.9 2.1 - 2.7 5.1 5.9 1.9
SLAST - 3.6 3.8 - - - 4.7 2.2 2.2 - 4.2 3.5 - 4.7 4.3
STRJO - 3.6 - 1.5 - - 1.0 - 3.6 0.5 - 0.8 2.6 1.3 -
- - - - - - - - - 1.8 - - - 0.5 -
UEBST - - - - - - - - - - - 3.8 4.7 - -
--------------------------------------------------------------------------------
Sum 10.7 10.6 8.8 1.5 9.1 - 15.8 12.2 12.9 9.5 10.3 14.4 17.8 21.4 7.6
3. Results (Meteors)
====================
June 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15
--------------------------------------------------------------------------------
EVAST - - - - - 11 - - - - - - - - -
KACJA - - - - - 7 9 9 - - - - - 5 4
MOLSI - - - - - 15 12 9 6 - - - 1 5 -
- - - - - 7 11 13 1 - - - 3 4 -
SLAST 3 7 - - - 16 9 20 3 2 - - - 5 -
STRJO 5 4 3 - 8 8 5 1 - - 7 - 10 4 1
- - - - - - 4 - - - - - - 11 -
UEBST 1 - - - - 1 - 2 - - - - - - -
--------------------------------------------------------------------------------
Sum 9 11 3 - 8 65 50 54 10 2 7 - 14 34 5
June 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
--------------------------------------------------------------------------------
EVAST - - 7 - - - - - - - - 13 - - -
KACJA - - - - - - - - - 1 5 - - 3 -
MOLSI 14 3 - - 4 - 17 21 12 3 - - 13 8 5
7 1 3 - 4 - 9 15 4 2 - 2 3 8 4
SLAST - 10 8 - - - 22 3 4 - 14 5 - 6 19
STRJO - 10 - 5 - - 3 - 10 2 - 2 11 6 -
- - - - - - - - - 3 - - - 1 -
UEBST - - - - - - - - - - - 8 5 - -
--------------------------------------------------------------------------------
Sum 21 24 18 5 8 - 51 39 30 11 19 30 32 32 28
Sirko Molau, 2004/07/14