Results of the IMO Video Meteor Network - July 2007
===================================================
July presented strong differences with respect to the weather between northern
and southern Europe: England suffered from strong rainfalls and one of the
worst floodings ever. In Germany, the weather was mediocre, and southern Europe
suffered from extremely hot and dry weather. So it is no wonder, that Stephen
Evans is still waiting for better weather, whereas all of our Slovenian and
Italian observers collected well above 20 observing nights.
Clear winner was the new Mintron camera ORION1 of Javor Kac with over 800
meteors. Even if I could not support the hypothesis quantitatively yet, this
result is another indication for aging of Mintron cameras. It seems that the
Sony ExView chip looses sensitivity after a few month of observation - maybe
due to deterrioration of the microlenses in front of the CCD pixels?
The overall number of recorded meteors increased significantly in July thanks
to the improving sporadic activity and several minor showers (Capricornids,
Aquariids, Perseids). The MetRec radiant plot showed repeatedly the Perseid
radiant and in the last night of July also clearly the radiant of the SDA.
Examples are the plots of HERMINE and MINCAM1.
With such complete observing series it is worthwhile to analyse the long-term
activity of individual meteor showers. For the analysis I utilized data of
seven Mintron cameras (HERMINE, BMH1, METKA, ORION1, MINCAM1, REMO1, MIN38 -
the data of SRAKA were not yet available at analysis time) with similar
characteristics (no image intensifier, Computar lenses with f/0.8) and that
collected at least 19 observing nights each.
An overall of almost three thousand meteors (266 CAP, 210 SDA, 358 PER,
2120 SPO) recorded between July 4/5 and July 31/August 1 contributed to the
analysis. That gives an average of 75 Sporadics per night, with individual
values between 16 and 153 (displayed in the background of the graph).
The meteor shower parameters (activity interval and radiant position) were
taken from the current IMO Working List of Meteor Showers. The shower and
sporadic meteors were summed up over all cameras for each night, and the
ratio between the number of shower and sporadic meteors was taken as an
activity measure for the shower.
The alpha-Capricornids, whose activity starts "officially" on July 3 according
to the IMO shower list, stayed unnoticable in the first half of the month.
Only after July 20 they became obvious, but the activity profile showed no
clear maximum. That agrees with the profile presented at the 2006 IMC, which
shows a plateau of almost constant CAP activity between mid-July and early
August.
The southern delta-Aquariids, which "officially" begin on July 11, showed
significant activity starting on July 24 with peak rates at the end of the
month. This is once more in good agreement with the 2006 analysis, which
revealed increasing SDA activity from July 25 onwards reaching a maximum at
the end of July.
The Perseids were already noticable at their "official" start on July 16 with
an upward activity trend all month. The automatic meteor shower analysis of
2006 gave a start date of July 14, but maybe the the Perseids can be tracked
even before that date?
1. Observers
============
Code Name Place Camera FOV LM Nights Time Meteors
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BRIBE Brinkmann Herne HERMINE (0.8/6) 55 dg 3 mag 22 77.0 h 293
CASFL Castellani Monte Baldo BMH1 (0.8/6) 55 dg 3 mag 26 135.3 h 392
EVAST Evans Moreton RF1 (0.8/12) 25 dg 5 mag 6 24.2 h 138
HINWO Hinz Brannenburg AKM2 (0.85/25) 32 dg 6 mag 14 50.2 h 248
KACJA Kac Kostanjevec METKA (0.8/8) 42 dg 4 mag 23 138.0 h 594
Ljubljana ORION1 (0.8/8) 42 dg 4 mag 25 126.4 h 816
KOSDE Koschny Noordwijkerh. ICC4 (0.85/25) 25 dg 5 mag 10 40.6 h 156
LUNRO Lunsford Chula Vista BOCAM (1.4/50) 60 dg 6 mag 7 22.4 h 169
MOLSI Molau Seysdorf AVIS2 (1.4/50) 60 dg 6 mag 14 48.2 h 606
MINCAM1 (0.8/6) 55 dg 3 mag 23 76.0 h 357
Ketzuer REMO1 (0.8/3.8) 80 dg 3 mag 19 62.7 h 318
STOEN Stomeo Scorze MIN38 (0.8/3.8) 80 dg 3 mag 23 127.5 h 619
STRJO Strunk Herford MINCAM2 (0.8/6) 55 dg 3 mag 16 38.4 h 91
MINCAM3 (0.8/8) 42 dg 4 mag 6 20.2 h 61
MINCAM5 (0.8/6) 55 dg 3 mag 7 25.5 h 102
TRIMI Triglav Velenje SRAKA (0.8/6) 55 dg 3 mag 28 142.8 h 546
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Sum 31 1155.4 h 5506
2. Observing Times (h)
======================
July 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15
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BRIBE 0.8 2.9 - - - - 5.7 - 0.8 3.0 - - 5.0 5.0 2.8
CASFL - 2.7 4.1 5.0 6.0 6.1 6.1 - - - 3.8 5.2 4.5 5.3 5.3
EVAST - - - - - 0.9 3.5 - - - - - - - -
HINWO - 1.2 - - - 1.0 1.5 - - - - - 5.3 5.3 5.3
KACJA 6.3 2.5 - - - 5.2 6.6 - - 2.7 6.4 5.4 6.6 6.3 6.3
3.4 1.7 2.0 0.5 5.9 - - 5.8 0.9 2.5 6.6 4.7 6.7 6.8 6.5
KOSDE 4.6 - - - - - - - - - - - 4.8 4.2 4.6
LUNRO - - - - - - - - - 1.0 - 4.5 5.7 - -
MOLSI - 3.0 - - - 3.1 1.9 - - 0.7 - - 3.6 5.2 5.4
- 4.0 - 0.6 - 1.9 1.8 1.3 0.4 2.9 - 0.5 6.0 6.0 6.1
3.5 - 1.0 - - 1.6 2.7 3.7 - 1.3 - 0.4 5.0 5.0 5.0
STOEN 5.4 0.9 - 5.8 6.0 6.0 - 0.9 5.2 - 5.9 6.1 6.4 6.4 5.7
STRJO - - 0.5 - - - 4.0 - - - - - 3.0 - 2.4
- - - - - - 2.0 - - - - - 4.3 - -
- - - - - - 3.9 - - - - - - - 4.4
TRIMI 4.7 1.7 - 3.2 5.7 4.2 5.7 6.0 - 4.2 4.2 5.3 6.2 3.8 6.3
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Sum 28.7 20.6 7.6 15.1 23.6 30.0 45.4 17.7 7.3 18.3 26.9 32.1 73.1 59.3 66.1
July 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
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BRIBE 1.0 6.1 6.1 5.1 3.2 0.3 6.2 2.7 0.7 6.0 - - 0.3 4.5 1.9 6.9
CASFL 5.4 5.4 6.5 6.5 4.7 5.0 - 4.7 6.7 6.7 6.7 6.7 5.9 3.9 2.9 3.5
EVAST - - - - - - - - - - - 4.7 - 4.9 5.1 5.1
HINWO 5.4 4.3 - - - 0.6 - - - 5.8 5.9 5.0 1.8 - 1.8 -
KACJA 6.1 5.7 6.8 5.4 6.4 6.8 7.1 7.1 - 6.8 6.6 7.1 - - 5.4 6.4
6.4 6.1 6.9 6.9 - - - 3.2 4.8 7.2 7.2 7.2 - 6.2 3.1 7.2
KOSDE - 1.1 5.9 6.5 1.3 2.0 5.6 - - - - - - - - -
LUNRO - - - - - - - - 2.5 5.2 - - - 1.5 2.0 -
MOLSI 3.3 - - - - - 5.1 - - 4.4 3.6 0.6 - - 4.3 4.0
4.6 1.1 0.7 0.3 - - 4.4 - 3.5 5.3 6.6 1.1 3.2 - 6.8 6.9
- 4.8 3.7 - 3.3 - 3.5 - - 5.7 1.7 5.8 4.4 - - 0.6
STOEN 6.4 6.4 6.0 6.7 - - 6.8 6.3 6.8 6.9 6.5 6.6 - 1.4 - -
STRJO 0.8 - 3.1 0.4 2.8 - 4.9 2.0 3.8 3.6 - 0.8 0.5 1.3 - 4.5
- 2.2 - - - - 3.8 - - 3.3 - - - - - 4.6
- 1.6 3.2 - - - 4.8 - - 4.8 - - - - - 2.8
TRIMI 5.7 6.0 6.0 6.5 5.8 5.3 6.7 6.4 6.5 6.2 6.7 6.5 - 0.3 0.3 6.7
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Sum 45.1 50.8 54.9 44.3 27.5 20.0 58.9 32.4 35.3 77.9 51.5 52.1 16.1 24.0 33.6 59.2
3. Results (Meteors)
====================
July 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15
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BRIBE 2 10 - - - - 16 - 2 9 - - 25 23 13
CASFL - 4 9 11 20 14 14 - - - 5 17 12 15 13
EVAST - - - - - 5 15 - - - - - - - -
HINWO - 1 - - - 1 3 - - - - - 34 26 39
KACJA 14 4 - - - 23 15 - - 4 20 24 35 38 35
11 5 3 1 16 - - 17 2 8 35 24 34 34 42
KOSDE 2 - - - - - - - - - - - 24 15 11
LUNRO - - - - - - - - - 1 - 43 52 - -
MOLSI - 35 - - - 42 15 - - 10 - - 74 100 75
- 11 - 2 - 13 6 2 1 4 - 1 30 29 18
4 - 4 - - 2 8 15 - 3 - 1 20 11 29
STOEN 15 3 - 24 31 32 - 2 17 - 44 26 25 29 27
STRJO - - 1 - - - 9 - - - - - 9 - 6
- - - - - - 3 - - - - - 17 - -
- - - - - - 14 - - - - - - - 12
TRIMI 13 4 - 7 14 16 17 13 - 10 19 15 25 15 27
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Sum 61 77 17 45 81 148 135 49 22 49 123 151 416 335 347
July 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
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BRIBE 3 28 16 9 9 1 27 9 2 21 - - 1 26 7 34
CASFL 13 19 17 17 13 19 - 14 17 24 27 23 16 19 7 13
EVAST - - - - - - - - - - - 29 - 34 24 31
HINWO 35 14 - - - 1 - - - 49 20 15 4 - 6 -
KACJA 37 31 21 28 19 22 36 36 - 35 38 19 - - 27 33
51 38 30 48 - - - 26 26 82 79 60 - 20 22 102
KOSDE - 2 27 18 4 9 44 - - - - - - - - -
LUNRO - - - - - - - - 5 58 - - - 7 3 -
MOLSI 50 - - - - - 48 - - 104 50 3 - - - -
23 5 3 1 - - 15 - - 32 26 2 10 - 60 63
- 23 8 - 15 - 12 - 8 22 3 15 19 - 59 37
STOEN 25 28 25 34 - - 36 29 39 39 46 42 - 1 - -
STRJO 2 - 5 1 4 - 13 4 7 9 - 2 1 2 - 16
- 4 - - - - 13 - - 8 - - - - - 16
- 5 12 - - - 27 - - 13 - - - - - 19
TRIMI 19 16 15 24 23 18 22 30 26 43 35 31 - 2 3 44
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Sum 258 213 179 180 87 70 293 148 130 539 324 241 51 111 218 408
Sirko Molau, 2007/08/16