Results of the IMO Video Meteor Network - November 2006
=======================================================
In November things came back to normality. Even though the weather remained
much too warm in central Europe, it was often clouded or foggy at many sites.
Only two observers managed to collect 20 or more observing nights, and
consequently there was no other series of new records. Thanks to the 24
cameras, the total was still impressive with almost 1500 hours effective
observing time and 6300 meteors. That's more than in any November before.
With Bernd Brinkmann, we could welcome a new observer in the video network.
Bernd operates his Mintron camera from Herne observatory in west Germany, and
he is well located for double-station observations with Joerg Strunk. The
fields of view of both cameras are aligned accordingly.
There were two events in November worth to be discussed in detail. At first
we had the Leonids. They were predicted to show for the last time in
the current cycle enhanced activity from a nearby dust trail. Maximum
activity with ZHRs between 100 and 150 and mainly faint meteors was forcasted
by the "usual suspects" for about 4:45 UT on November 19.
Even though the weather was not ideal, many visual observers managed to get
a least a glimpse on the Leonids. The video observers were less successful,
though. Even though almost every observer could record a few meteors in the
evening (an overall of 18 cameras were in operation - given that the data of
Remo1 is still missing, this might become a new record? :-), clouds and fog
showed up at most sites in the morning. In the end only Stephen Evans (on the
island) and Flavio Castellani (south of the Alps) were able to record up to
dawn under constantly good conditions. There are also data from Ondrejov
observatory, but at their site a thin cloud blanket show up in the morning
making it impossible to derive a proper activity profile.
Both cameras mentioned above are non-intensified, such that faint Leonids
could not be recorded. The 30-min interval counts (corrected for the radiant
altitude) showed a slightly different picture for each camera: The corrected
Leonid counts of RF1 doubled between 4:30 and 6:00 UT. BMH1, on the other hand,
observed highest activity between 3:30 and 4:00 and after 4:30 UT. The
overall profile shows also enhanced activity between 0:00 and 0:30, but the
correction factors were quite large at that time due to the low radiant:
2006/11/19 RF1 BMH1 RF1 + BMH1
UT # LEO # SPO # LEO # SPO LEO/h/sin hR SPO/h
--------------------------------------------------------------
00:00-00:30 1 2 4 1 14.6 3.0
00:30-01:00 0 3 3 0 6.6 3.0
01:00-01:30 0 4 0 0 0.0 4.0
01:30-02:00 1 3 2 0 5.4 3.0
02:00-02:30 1 2 2 0 4.9 2.0
02:30-03:00 1 2 2 3 4.5 5.0
03:00-03:30 1 0 10 1 14.7 1.0
03:30-04:00 0 5 3 2 3.8 7.0
04:00-04:30 2 3 9 0 13.5 3.0
04:30-05:00 6 5 5 3 13.4 8.0
05:00-05:30 5 4 12.0 8.0
05:30-06:00 5 6 11.8 12.0
--------------------------------------------------------------
Bottom line: Our video data confirm enhanced Leonid activity in the morning of
November 19, but we cannot give details on the maximum time or activity level.
The second highlight of November is connected with another probably unknown
meteor shower that was observed. By the end of November, SonotaCo informed me
about unusual activity that was noticed by Japanese video observers between
November 24 and 26 - this time originating from northern Orion. Mr. Uehara
found a radiant from 13 meteor pairs at alpha=88 deg and delta=15.9 deg with
a velocity of 39.6 km/s. He noticed that this radiant was consistent with
"shower #72" in the list that was presented by me at the last IMC. This shower
was detected between solar longitude 243 and 255 (November 12 - December 5)
with a radiant at alpha=88.2 deg, delta=15.5 deg on November 25 and a mean
velocity of 44 km/s. In my analysis "shower #72" was identified as the
Monocerotids, even though there was significant discrepancy to the radiant
position given in the IMO Working List (alpha=86 deg, delta=8 deg, v=40 km/s).
But that's only half of the story: In early November I received a letter by
Dr. Ichiro Hasegawa, that was a big surprise to me. He was so kind and sent
me mean orbits he had calculated for each meteor shower I had presented at
the IMC. Imagine my happiness when I realized how well the orbital elements
of "shower #72" agreed with the preliminary Japanese values of Mr. Uehara:
Data Set Longitude of Argument of Incli- Eccen- Perihelion Semimajor
ascend. node perihelion nation tricity distance axis
[deg] [deg] [deg] [AE] [AE]
------------------------------------------------------------------------------
IMO Network 65.5 142.9 21.9 0.957 0.119 2.782
(I. Hasegawa)
SonotaCo Netw. 62.4 144.0 21.9 1.0 0.1 2.8
(S. Uehara)
------------------------------------------------------------------------------
From this comparison, two things can be concluded: The most important message
for me was, that realiable orbital elements can be derived also from single
station video data.
Furthermore, the Japanese observations confirm the deviation of the radiant
obtained by the IMO video network from the one given in the IMO Working List.
The radar and photographic Monocerotid orbits given in the IMO Visual Handbook
have only little in common with the values given above, too. Either those
orbits do not fit to the Monocerotids, or we observed a new meteor shower that
has only by chance some similarity to the Monocerotids.
1. Observers
============
Code Name Place Camera FOV LM Nights Time Meteors
--------------------------------------------------------------------------------
BENOR Benitez-S. Las Palmas TIMES4 (1.5/50) 20 dg 3 mag 12 24.6 h 40
TIMES5 (0.95/50) 10 dg 3 mag 15 26.6 h 43
BRIBE Brinkmann Herne Hermine (0.8/6) 55 dg 3 mag 8 77.6 h 209
CASFL Castellani Monte Baldo BMH1 (0.8/6) 55 dg 3 mag 19 153.9 h 436
ELTMA Eltri Venezia MET38 (0.8/3.8) 80 dg 3 mag 6 58.5 h 233
EVAST Evans Moreton RF1 (0.8/12) 25 dg 5 mag 11 94.0 h 378
HINWO Hinz Brannenburg AKM2 (0.85/25) 32 dg 5 mag 12 61.2 h 367
KACJA Kac Kostanjevec METKA (0.8/8) 42 dg 2 mag 18 96.0 h 220
Kamnik REZIKA (0.8/6) 55 dg 3 mag 13 46.0 h 249
KOSDE Koschny Noordwijkerh. ICC3 (0.85/25) 25 dg 5 mag 7 43.4 h 186
LUNRO Lunsford Chula Vista BOCAM (1.4/50) 60 dg 6 mag 13 93.0 h 810
MOLSI Molau Seysdorf AVIS2 (1.4/50) 60 dg 6 mag 11 47.8 h 625
MINCAM1 (0.8/6) 55 dg 3 mag 19 101.6 h 376
SLAST Slavec Ljubljana KAYAK1 (1.8/28) 50 dg 4 mag 22 96.6 h 187
SPEUL Sperberg Salzwedel AKM1 (0.85/2) 32 dg 5 mag 8 35.1 h 111
STOEN Stomeo Scorze MIN38 (0.8/3.8) 80 dg 3 mag 10 69.0 h 297
STORO Stork Ondrejov OND1 (1.4/50) 55 dg 6 mag 1 4.4 h 158
STRJO Strunk Leopoldshoehe MINCAM2 (0.8/6) 55 dg 3 mag 20 89.1 h 330
MINCAM3 (0.8/8) 42 dg 4 mag 5 10.6 h 28
MINCAM4 (1.4/2) 180 dg 0 mag 5 20.1 h 6
MINCAM5 (0.8/6) 55 dg 3 mag 7 46.2 h 255
TRIMI Triglav Velenje SRAKA (0.8/6) 55 dg 3 mag 19 125.3 h 438
YRJIL Yrjola Kuusankoski FINEXCAM (0.8/6) 55 dg 3 mag 9 46.4 h 272
--------------------------------------------------------------------------------
Sum 30 1467.0h 6295
2. Observing Times (h)
======================
Nov 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15
--------------------------------------------------------------------------------
BENOR - 3.7 - - - - - - 1.0 0.6 - - 0.7 - -
- 0.7 - - - - - - 1.6 2.6 - - 0.9 - -
BRIBE - - - - - - - - - - - - - - 12.1
CASFL 11.8 11.9 11.9 9.0 - 9.0 5.1 4.9 10.8 12.0 3.1 12.2 10.2 6.6 3.2
ELTRI - 11.0 11.0 - - - - - - 9.7 - 2.3 - - -
EVAST 9.9 11.3 11.1 - - - - 7.3 7.6 5.0 - - - - -
HINWO - - - - - 2.5 3.0 1.1 - 9.9 - - - - -
KACJA - 4.4 - 1.2 - 6.7 4.9 - 6.9 5.7 - 5.3 5.3 6.3 9.9
- 1.3 - - - 6.8 7.0 - 3.0 - - 4.5 0.3 3.4 -
KOSDE - - - - - - - - - - - - - - -
LUNRO - - - - - - 10.3 9.6 - - 7.3 - - 6.5 3.9
MOLSI - - - - - - 0.6 - 4.0 4.7 - - - - 5.9
3.3 0.2 4.4 - - 8.8 4.4 5.8 6.2 5.5 0.7 - 0.9 1.2 13.0
SLAST 3.3 3.5 5.5 4.0 4.3 3.3 5.7 1.5 2.0 3.0 3.6 9.3 5.1 4.6 4.3
SPEUL - - - - - - - - - - - 2.2 - - 5.6
STOEN - 11.3 4.1 - - - - - - 11.4 - 2.4 - 5.2 -
STORO - - - - - - - - - - - - - - -
STRJO 3.0 2.0 - - - - 2.6 - 4.7 - 0.7 - 1.0 - 8.1
0.5 - - - - - - - 1.0 - - - - - 7.6
3.0 2.0 - - - - 1.4 - - - - - - - -
- - - - - - - - - - - - - - 9.1
TRIMI - - - 2.8 1.0 10.3 10.4 9.3 - 8.2 1.3 9.4 - 6.5 10.6
YRJIL - - 8.0 5.5 1.4 - 1.4 8.6 - 1.7 - - - - -
--------------------------------------------------------------------------------
Sum 34.8 63.3 56.0 22.5 6.7 47.4 56.8 48.1 48.8 80.0 16.7 47.6 24.4 40.3 93.3
Nov 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
--------------------------------------------------------------------------------
BENOR - 0.8 1.3 - - 2.9 - 2.4 4.2 - 0.8 - - 2.7 3.5
- 0.9 0.3 - - 2.0 1.9 3.5 0.7 0.8 2.3 2.5 - 3.4 2.5
BRIBE - 12.3 1.7 8.9 - 13.0 - 5.0 - - 9.2 6.1 - 9.3 -
CASFL 7.8 - 9.3 - 3.8 - 6.4 4.9 - - - - - - -
ELTRI - - - - - - - - - - - - - 12.2 12.3
EVAST 6.8 9.1 9.1 - - 8.7 - - - 8.1 - - - - -
HINWO - - 5.0 - - - 6.0 3.8 6.2 10.4 4.2 2.0 - - 7.1
KACJA 7.4 6.1 3.0 7.3 - 0.3 - 7.4 1.8 6.1 - - - - -
- 3.3 4.8 - - - - 9.7 - 0.5 0.3 - - - 1.1
KOSDE - 1.3 5.1 7.6 - 0.4 - - - - 11.0 8.4 - 9.6 -
LUNRO 11.4 4.1 5.7 6.4 11.7 6.9 4.5 - - - 4.7 - - - -
MOLSI 5.5 - 1.8 - 4.2 - 6.6 2.4 7.7 4.4 - - - - -
6.9 - 1.3 - 8.7 - 11.8 5.8 5.3 7.4 - - - - -
SLAST - 2.5 3.5 3.5 - - 1.1 11.3 - - 8.3 3.4 - - -
SPEUL 1.4 3.7 8.5 - - 2.5 - - - - 4.9 6.3 - - -
STOEN - - - - 0.7 - 6.1 6.1 - - - - - 10.2 11.5
STORO - - 4.4 - - - - - - - - - - - -
STRJO 1.7 8.2 9.2 4.9 - 7.5 0.7 4.3 0.2 - 13.2 7.4 0.5 3.8 5.4
- - - - - - - - - - - - 0.5 1.0 -
- - - - - - - - - - 13.2 - 0.5 - -
- 9.1 4.8 - - 4.2 1.0 - - - 10.0 8.0 - - -
TRIMI 9.3 6.8 7.3 9.1 - 1.1 - 8.2 - 5.6 7.3 - 0.8 - -
YRJIL - - - - - - - - - - 2.9 9.8 - - 7.1
--------------------------------------------------------------------------------
Sum 58.2 68.2 86.1 47.7 29.1 49.5 46.1 74.8 26.1 43.3 92.3 53.9 2.3 52.2 50.5
3. Results (Meteors)
====================
Nov 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15
--------------------------------------------------------------------------------
BENOR - 7 - - - - - - 1 1 - - 2 - -
- 1 - - - - - - 1 3 - - 1 - -
BRIBE - - - - - - - - - - - - - - 36
CASFL 31 33 41 27 - 27 19 14 30 21 8 17 29 27 1
ELTRI - 60 37 - - - - - - 33 - 5 - - -
EVAST 51 46 31 - - - - 21 12 10 - - - - -
HINWO - - - - - 24 28 7 - 28 - - - - -
KACJA - 9 - 2 - 12 18 - 12 11 - 15 7 15 24
- 7 - - - 36 36 - 9 - - 23 4 14 -
KOSDE - - - - - - - - - - - - - - -
LUNRO - - - - - - 70 55 - - 29 - - 32 62
MOLSI - - - - - - 2 - 44 33 - - - - 117
15 1 13 - - 32 42 20 34 20 3 - 2 10 46
SLAST 18 9 9 3 5 3 7 1 2 7 7 21 13 7 5
SPEUL - - - - - - - - - - - 3 - - 26
STOEN - 64 9 - - - - - - 42 - 4 - 21 -
STORO - - - - - - - - - - - - - - -
STRJO 12 11 - - - - 14 - 20 - 3 - 4 - 39
1 - - - - - - - 3 - - - - - 18
2 1 - - - - 1 - - - - - - - -
- - - - - - - - - - - - - - 62
TRIMI - - - 5 4 23 25 32 - 24 7 39 35 19 41
YRJIL - - 76 31 1 - 8 60 - 6 - - - - -
--------------------------------------------------------------------------------
Sum 130 249 216 68 10 157 270 210 168 239 57 127 97 145 477
Nov 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
--------------------------------------------------------------------------------
BENOR - 1 2 - - 5 - 4 7 - 1 - - 4 5
- 2 1 - - 4 4 5 1 1 5 5 - 5 4
BRIBE - 35 4 28 - 29 - 21 - - 26 20 - 10 -
CASFL 9 - 70 - 8 - 20 4 - - - - - - -
ELTRI - - - - - - - - - - - - - 50 48
EVAST 26 47 81 - - 27 - - - 26 - - - - -
HINWO - - 57 - - - 52 20 19 69 15 12 - - 36
KACJA 22 11 6 19 - 1 - 15 7 14 - - - - -
- 7 30 - - - - 77 - 2 1 - - - 3
KOSDE - 2 19 13 - 6 - - - - 58 52 - 36 -
LUNRO 102 63 70 101 102 50 44 - - - 30 - - - -
MOLSI 81 - 15 - 58 - 117 24 67 67 - - - - -
35 - 4 - 12 - 45 7 16 19 - - - - -
SLAST - 3 5 8 - - 2 33 - - 14 5 - - -
SPEUL 4 8 30 - - 4 - - - - 11 25 - - -
STOEN - - - - 2 - 24 24 - - - - - 54 53
STORO - - 158 - - - - - - - - - - - -
STRJO 4 22 21 29 - 30 2 14 1 - 41 28 1 15 19
- - - - - - - - - - - - 1 5 -
- - - - - - - - - - 1 - 1 - -
- 43 33 - - 25 4 - - - 43 45 - - -
TRIMI 63 17 26 35 - 3 - 28 - 28 24 - 1 - -
YRJIL - - - - - - - - - - 7 43 - - 40
--------------------------------------------------------------------------------
Sum 346 261 632 233 182 184 314 276 118 226 277 235 4 179 208
Sirko Molau, 2006/12/13