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