Results of the IMO Video Meteor Network - February 2009
=======================================================

Such a clear North-South gradient with respect to the observing conditions 
as in the last month is exceptional. In northern Europe, the conditions were 
catastrophic - not even one observer north of the Alps managed to get more 
than 50 observing hours. In Slovenia, the situation became slightly better, 
and observers in Italy and Portugal enjoyed almost permanent clear skies 
after February 10. According to this statistics, America lies also south of 
the Alps. ;-)
In total, we collected an acceptable 1,700 hours of effective observing 
time and 3,600 meteors altogether.

Also with respect to meteor shower activity, February is a poor month. The 
IMO meteor shower working list knows just one northern shower, namely the 
delta Leonids. It was not detected in the automated meteor shower search, 
though. A closer inspection of the radiants at individual solar longitudes 
reveals, that the delta Leonids seem to be at least partly active. They are 
most prominent in the following intervals:

Solar Longitude   Right Ascension   Declination   Velocity   Meteor Number
      [deg]             [deg]           [deg]      [km/s]
==========================================================================
       334             161.6            13           25           18
       335             162.0            13.5         25           25
       338             166.0            12           24           25
       339             169.6            16           24           12
       341             167.3            14.5         27           18
==========================================================================

According to the IMO handbook, the radiant position at maximum is
alpha=168°, delta=+16°, which fits reasonably to the values given above.
Also the velocity of 23 km/s matches approximately.

Beside this shower, only the Antihelion source is reasonably active. It has, 
however, no clearly defined radiant, but only a diffuse radiation area. So 
it comes as no surprise, that the meteor shower analysis reveals a number of 
individual Antihelion radiants.

Also for February, the 2008 video meteor database analysis yielded a number 
of meteor shower candidates, which are unknown to the IMO shower list. The 
candidate with least scatter is a possible weak shower from February 2 to 7 
(solar longitude 313-318 degree), based on just 66 showers members. On
February 4, the average radiant lies at alpha=162°, delta=-14°
(figure 1). The mean meteor shower velocity is 45 km/s. 

It seems that this shower has not been detected in the optical domain so far. 
However, the catalog from the Advanced Meteor Orbit Radar (AMOR) lists the 
alpha Antiliids (AAN) shower with quite similar characteristics (alpha=162°,
delta=-13°, vinf=43 km/s) on February 2. The shower was also found by the
Canadian Meteor Orbit Radar (CMOR). According their latest analysis, it is
active between solar longitude 308 and 321 degree. On February 4 the shower
lies at alpha=162°, delta=-12° (reference position in figure 1). Also
the meteor shower velocity (44 km/s) matches well to the video data. Thus,
the existence of the alpha Antiliids is now also proved in the optical domain.


Figure 1: Radiant position of the alpha Antiliids in the constellation crater.
The reference position was taken from the CMOR data.

The naming of the shower is somewhat surprising, since alpha Antlia lies 
about 20 degree south. According the Peter Brown, the original radiant
position must have been significantly in error or the name was choosen by 
mistake. In order to prevent further confusion, the original name was still 
kept up to now.

The activity profile (figure 2) shows, that the ZHR will hardly exceed one 
in the full activity interval.


Figure 2: Long-term activity profile of the alpha Antiliids.


1. Observers
============

Code    Name        Place           Camera         FOV    LM Nights Time Meteors
--------------------------------------------------------------------------------
BRIBE Brinkmann   Herne         HERMINE (0.8/6)   55 dg  3 mag 13   30.0 h    96
CASFL Castellani  Monte Baldo   BMH1 (0.8/6)      55 dg  3 mag 14   87.2 h   130
                                BMH2 (0.8/6)      55 dg  3 mag 16   89.7 h   127
CRIST Crivello    Genova        C3P8 (0.8/3.8)    80 dg  3 mag 19  148.1 h   387
ELTMA Eltri       Venezia       MET38 (0.8/3.8)   80 dg  3 mag  9   50.9 h   104
GONRU Goncalves   Tomar         TEMPLAR1 (0.8/6)  55 dg  3 mag 18  172.1 h   429
                                TEMPLAR2 (0.8/6)  55 dg  3 mag 21  172.6 h   277
HERCA Hergenroth. Tucson        SALSA (1.2/4)     80 dg  3 mag 24  143.6 h   207
HINWO Hinz        Brannenburg   AKM2 (0.85/25)    32 dg  6 mag  8   52.9 h   143
KACJA Kac         Kostanjevec   METKA (0.8/8)     42 dg  4 mag 10   49.7 h    68
                  Kamnik        REZIKA (0.8/6)    55 dg  3 mag 12   80.4 h   187
                                STEFKA (0.8/3.8)  80 dg  3 mag 12   41.4 h    62
                  Ljubljana     ORION1 (0.8/8)    42 dg  4 mag 15   55.2 h    77
KOSDE Koschny     Noordwijkerh. TEC1 (1.4/12)     30 dg  4 mag  2   11.6 h    14
LUNRO Lunsford    Chula Vista   BOCAM (1.4/50)    60 dg  6 mag 16  103.3 h   269
MOLSI Molau       Seysdorf      AVIS2 (1.4/50)    60 dg  6 mag  7   39.5 h   239
                                MINCAM1 (0.8/6)   55 dg  3 mag 11   28.8 h    47
                  Ketzuer       REMO1 (0.8/3.8)   80 dg  3 mag 12   40.3 h    91
                                REMO2 (0.8/3.8)   80 dg  3 mag 13   32.9 h    58
OCHPA Ochner      Albiano       ALBIANO (1.2/4.5) 68 dg  3 mag 18  107.3 h   207
PRZDA Przewozny   Berlin        ARMEFA (0.8/6)    55 dg  3 mag  9   15.0 h    37
SLAST Slavec      Ljubljana     KAYAK1 (1.8/28)   50 dg  4 mag  9   26.4 h    39
STOEN Stomeo      Scorze        MIN38 (0.8/3.8)   80 dg  3 mag 11   74.2 h   143
                                MIN26 (1.0/2.6)  120 dg  2 mag  2   23.2 h    30
STRJO Strunk      Herford       MINCAM2 (0.8/6)   55 dg  3 mag  5   17.7 h    28
                                MINCAM3 (0.8/8)   42 dg  4 mag  3   10.8 h    13
                                MINCAM5 (0.8/6)   55 dg  3 mag  4   19.2 h    40
YRJIL Yrjola      Kuusankoski   FINEXCAM (0.8/6)  55 dg  3 mag  4   31.7 h    62
--------------------------------------------------------------------------------
Overall                                                        28 1764.7 h  3611


2. Observing Times (h)
======================

Feb    01   02   03   04   05   06   07   08   09   10   11   12   13   14   15
--------------------------------------------------------------------------------
BRIBE  0.3  5.6   -   3.0  0.6  1.3  3.8  0.3  0.5  0.6   -    -    -   6.1   -
CASFL   -    -   2.2   -    -    -    -    -    -    -    -    -    -    -    -
        -    -   2.7   -    -    -    -   2.1   -    -    -    -    -   3.0  6.0
CRIST   -    -   4.5   -    -    -    -   7.7   -   5.4 11.7 10.7 11.8  9.6  6.2
ELTMA   -    -    -    -    -    -    -    -    -    -    -    -   7.2  6.9  4.8
GONRU   -    -   1.5   -    -    -   3.7   -    -  11.7 11.7 11.7 11.7   -  11.5
        -   1.8  5.9  9.4   -    -   4.9   -    -   8.8  8.7 10.5 11.7  1.8 11.6
HERCA 11.5  5.0 11.5  9.3  7.7  4.8  3.4   -   0.4   -   8.4   -   8.4  0.9  3.5
HINWO  1.8   -  11.9  8.5   -    -    -    -    -    -    -    -    -    -   2.2
KACJA   -    -    -    -    -    -    -    -   4.7   -   8.9  2.6   -   7.5   - 
        -    -    -    -    -    -    -    -    -    -   0.2 11.2  5.5 11.3  3.4
        -    -    -    -    -    -    -    -    -    -   0.2  9.4  3.5  5.3  2.0
        -    -    -    -    -    -    -    -   1.4   -  11.5  5.2  2.1  5.6  1.1
KOSDE   -    -    -    -    -    -    -    -    -    -    -    -   7.8  3.8   -
LUNRO 11.3  7.5 10.7  9.3  2.9   -    -    -    -    -   8.9   -   2.1   -   4.1
MOLSI   -    -   9.8   -    -    -    -    -    -    -    -   1.9   -   2.8  3.7
       2.7  0.4  3.6   -    -    -    -   1.9   -    -   0.7   -    -   2.1  0.5
        -   2.3   -   1.2  8.5   -    -   1.5   -    -   3.1  3.1  9.7  6.6   - 
        -   1.3   -   0.7  1.2   -    -   2.3  1.5   -   2.1  7.2  4.6  2.1   -
OCHPA   -    -    -    -    -    -    -   1.0   -   5.1  6.0  8.1  9.1  7.1  4.3
PRZDA  0.4  2.4   -   1.3   -    -    -   3.7  1.0   -    -   1.8   -   1.7   -
SLAST   -    -    -    -    -    -    -    -    -    -    -    -   2.3  2.7  0.6
STOEN   -    -    -   3.0   -    -    -    -    -    -    -   6.2  8.1 10.0  4.4
        -    -    -    -    -    -    -    -    -    -    -    -    -    -    -
STRJO   -   1.7   -    -    -   0.7   -   0.6   -    -    -    -    -   5.0   -
        -    -   0.5   -    -   0.7   -    -    -    -    -    -    -   4.2   - 
        -    -   0.5   -    -    -    -    -    -    -    -    -    -  10.0   -
YRJIL   -    -    -    -    -    -    -    -    -    -    -    -    -    -   9.9
--------------------------------------------------------------------------------
Sum   28.0 28.0 65.3 45.7 20.9  7.5 15.8 21.1  9.5 31.6 82.1 89.6105.6116.1 79.8

Feb    16   17   18   19   20   21   22   23   24   25   26   27   28
----------------------------------------------------------------------
BRIBE   -   5.3   -    -    -    -    -    -   0.3   -    -    -   2.3
CASFL  9.7 11.7 11.6 11.6  0.5  8.2  3.9  2.2  7.3  1.6  3.3 11.2  2.2 
      11.7  4.7 11.6  8.6   -   6.8  2.0  4.2  8.3  2.1  6.2  7.2  2.5
CRIST  7.4  7.3 10.3 10.6  1.0  9.0  7.6  7.2  6.2  7.3   -   6.6   -
ELTMA  5.8  5.1  5.3  9.4   -   2.1  4.3   -    -    -    -    -    -
GONRU 11.3 11.5  7.5  8.4  6.2  9.3 11.3 11.2 11.3 11.2  9.4   -    - 
      11.6 11.5  2.2  4.9  3.3  9.4 11.3 11.3 11.3 11.3  9.4   -    -
HERCA  6.3  2.1  4.7 10.9 11.0  6.1  5.8   -   4.6  0.5 10.8  2.2  3.8
HINWO   -    -  11.2  3.8   -    -    -    -    -   2.8   -    -  10.7
KACJA   -    -   8.7  5.3   -    -    -    -    -   5.1  0.4  2.3  4.2
        -    -    -   8.8  4.0   -    -    -   9.0  4.0  7.4 11.3  4.3
        -    -    -   4.8  3.0   -    -    -    -   1.1  4.4  4.4  3.3
        -   1.2 11.3  3.8   -    -   1.1  0.7  3.5  0.6  1.6  4.5   -
KOSDE   -    -    -    -    -    -    -    -    -    -    -    -    -
LUNRO   -    -   1.8 11.0 10.5  2.5   -    -   4.4  2.2 10.8  3.3   -
MOLSI   -  10.2  7.4  3.7   -    -    -    -    -    -    -    -    - 
        -   6.9  7.9  0.8   -    -    -    -    -    -    -    -   1.3
       1.1  3.9   -    -    -    -    -    -    -    -   1.9  6.4   - 
        -   2.9   -    -    -    -    -    -   1.6   -   0.5  4.9   -
OCHPA  5.2  7.0  8.0   -   3.2  6.5  5.4  9.2  6.4  3.1  4.2  8.4   -
PRZDA  1.5  1.2   -    -    -    -    -    -    -    -    -    -    -
SLAST   -    -   8.4  2.6   -    -    -    -   3.3  1.4   -   2.8  2.3
STOEN  5.1  7.9  5.4 11.8   -    -    -    -    -   3.2   -   9.1   - 
        -    -  11.6 11.6   -    -    -    -    -    -    -    -    -
STRJO   -   9.7   -    -    -    -    -    -    -    -    -    -    - 
        -   5.4   -    -    -    -    -    -    -    -    -    -    - 
        -   8.7   -    -    -    -    -    -    -    -    -    -    -
YRJIL  5.9   -    -   4.9   -    -    -    -    -  11.0   -    -    -
----------------------------------------------------------------------
Sum   82.6124.2134.9137.3 42.7 59.9 52.7 46.0 77.5 68.5 70.3 84.6 36.9


3. Results (Meteors)
====================

Feb    01   02   03   04   05   06   07   08   09   10   11   12   13   14   15
--------------------------------------------------------------------------------
BRIBE   2   13    -   14    3    4    7    2    2    3    -    -    -   23    -
CASFL   -    -    7    -    -    -    -    -    -    -    -    -    -    -    - 
        -    -    7    -    -    -    -    6    -    -    -    -    -    7    6
CRIST   -    -   10    -    -    -    -   27    -   18   51   32   28   34    9
ELTMA   -    -    -    -    -    -    -    -    -    -    -    -   26   15    8
GONRU   -    -    2    -    -    -    5    -    -   26   32   40   25    -   33 
        -    2    6   22    -    -    7    -    -   16   20   20   17    3   20
HERCA  19    8   23   14   14    5    2    -    1    -   11    -    7    1    4
HINWO   4    -   48   20    -    -    -    -    -    -    -    -    -    -    3
KACJA   -    -    -    -    -    -    -    -    8    -   14    3    -   13    - 
        -    -    -    -    -    -    -    -    -    -    1   28    9   40    2
        -    -    -    -    -    -    -    -    -    -    1   17    2    9    2 
        -    -    -    -    -    -    -    -    1    -   16   15    3    9    1
KOSDE   -    -    -    -    -    -    -    -    -    -    -    -   10    4    -
LUNRO  24   15   44   40    8    -    -    -    -    -   13    -    8    -    3
MOLSI   -    -   62    -    -    -    -    -    -    -    -    2    -   10   18 
        5    2    5    -    -    -    -    4    -    -    1    -    -    2    1 
        -    4    -    3   19    -    -    3    -    -    6    6   15    8    - 
        -    7    -    2    2    -    -    3    1    -    4   14    7    3    -
OCHPA   -    -    -    -    -    -    -    3    -   11   11   20   19   12    6
PRZDA   1    4    -    5    -    -    -    7    2    -    -    4    -    7    -
SLAST   -    -    -    -    -    -    -    -    -    -    -    -    4    3    1
STOEN   -    -    -    3    -    -    -    -    -    -    -   11   25   21    9 
        -    -    -    -    -    -    -    -    -    -    -    -    -    -    -
STRJO   -    3    -    -    -    1    -    1    -    -    -    -    -    5    - 
        -    -    1    -    -    -    -    -    -    -    -    -    -    4    - 
        -    -    1    -    -    2    -    -    -    -    -    -    -   17    -
YRJIL   -    -    -    -    -    -    -    -    -    -    -    -    -    -   12
--------------------------------------------------------------------------------
Sum    55   58  216  123   46   12   21   56   15   74  181  212  205  250  138

Feb    16   17   18   19   20   21   22   23   24   25   26   27   28
----------------------------------------------------------------------
BRIBE   -   13    -    -    -    -    -    -    1    -    -    -    9
CASFL  12   14   16   14    1   10    5    5   10    3    7   20    6 
       10    7   18    7    -   11    2    7   12    3    7   12    5
CRIST  16   29   25   23    2   20   12   15   11   11    -   14    -
ELTMA   9   11   13   13    -    4    5    -    -    -    -    -    -
GONRU  28   25   16   11   13   23   38   29   35   24   24    -    - 
       26   12    8    4    5   13   21   20   13   14    8    -    -
HERCA  10    5    6   14   18   12    4    -    7    1   13    4    4
HINWO   -    -   21    8    -    -    -    -    -   13    -    -   26
KACJA   -    -   12    6    -    -    -    -    -    4    1    2    5 
        -    -    -   16    9    -    -    -   19    9   17   30    7 
        -    -    -    4    2    -    -    -    -    1    6   13    5 
        -    2   12    3    -    -    1    1    5    1    1    6    -
KOSDE   -    -    -    -    -    -    -    -    -    -    -    -    -
LUNRO   -    -    6   25   23    3    -    -   26    2   24    5    -
MOLSI   -   84   54    9    -    -    -    -    -    -    -    -    - 
        -    9   15    2    -    -    -    -    -    -    -    -    1 
        3   13    -    -    -    -    -    -    -    -    2    9    - 
        -    7    -    -    -    -    -    -    2    -    1    5    -
OCHPA  13    9   21    -    4   15    5   13   15    4    9   17    -
PRZDA   4    3    -    -    -    -    -    -    -    -    -    -    -
SLAST   -    -   14    5    -    -    -    -    4    1    -    4    3
STOEN   8   16   13   19    -    -    -    -    -    4    -   14    - 
        -    -   20   10    -    -    -    -    -    -    -    -    -
STRJO   -   18    -    -    -    -    -    -    -    -    -    -    - 
        -    8    -    -    -    -    -    -    -    -    -    -    - 
        -   20    -    -    -    -    -    -    -    -    -    -    -
YRJIL  14    -    -    9    -    -    -    -    -   27    -    -    -
----------------------------------------------------------------------
Sum   153  305  290  202   77  111   93   90  160  122  120  155   71

Sirko Molau, 2009/03/31