(meteorobs) Remarkable activity of Perseids on July ?

[Enrico Stomeo]

>From our video meteor data results a remarkable activity of 
meteors, apparently Perseids, from a radiant near alpha_CAS 
during the nights of July 14/15, 15/16 and 16/17.
The radiant area was very close to theoretical radiant of
Perseids.

These meteors result from the first data collected from 5
video cameras of 3 stations of our team (UAI-sm):
--- Obs: Enrico STOMEO (STOEN)
Loc: Scorze'(VE), Italy, +45.567 -12.114 +20 (IMO code 14083)
VideoCam: SCO38 Ob.3,8 f:0,8 (field 89.2x68.6) + MetRec_41
VideoCam: MIN38 Ob.3,8 f:0,8 (field 89.2x68.6) + MetRec_41
VideoCam: NOA38 Ob.3,8 f:0,8 (field 89.2x68.6) + MetRec_41
--- Obs: Stefano CRIVELLO (CRIST)
Loc: Genova (GE), Italy, +44.418 -8.998 +10 (IMO code 14024)
VideoCam: C3P8 Ob.3,8 f:0,8 (field 89.2x68.6) + MetRec_41
--- Obs: Maurizio ELTRI (ELTMA)
Loc: Venezia (VE), Italy, +45.413 -12.37 +10 (IMO code 14230)
VideoCam: MET38 Ob.3,8 f:0,8 (field 89.2x68.6) + MetRec_41

On the linked gnomonic maps, we have plotted for each night 
all these meteors filmed by our cameras:
http://meteore.uai.it/m2010/July_14-15.gif
http://meteore.uai.it/m2010/July_15-16.gif
http://meteore.uai.it/m2010/July_16-17.gif
The two crosses on the maps indicate the theoretical 
radiants of Perseids (rad. 45/+58 Aug.12, shift +1.3/+0.2, 
Vel 59) and of July CASs (rad. 00/+56 Jul.21, shift +1.2/
+0.3, Vel 58).

The increase of activity of this radiant area is clear:
----------------------------------------
July 14/15
Teff=6.65h Tot=27 PER=3 (cam Sco38)
Teff=6.65h Tot=34 PER=6 (cam Min38)
Teff=6.66h Tot=39 PER=6 (cam Noa38) 
Teff=6.58h Tot=28 PER=5 (cam C3p8)  
Teff=5.27h Tot=17 PER=3 (cam Met38)
approximate radiant 005.5,+50.9
----------------------------------------
July 15/16
Teff=6.49h Tot=46 PER=6 (cam Sco38)
Teff=6.52h Tot=46 PER=7 (cam Min38)
Teff=6.53h Tot=33 PER=4 (cam Noa38) 
Teff=4.03h Tot=17 PER=4 (cam C3p8)  
Teff=5.40h Tot=11 PER=3 (cam Met38)
approximate radiant 006.2,+51.4
----------------------------------------
July 16/17
Teff=6.70h Tot=62 PER=6 (cam Sco38)
Teff=6.72h Tot=40 PER=5 (cam Min38)
Teff=6.73h Tot=29 PER=3 (cam Noa38) 
Teff=6.61h Tot=25 PER=6 (cam C3p8)  
Teff=6.44h Tot=23 PER=4 (cam Met38)
approximate radiant 007.9,+52.1
----------------------------------------
July 17/18
Teff=4.53h Tot=14 PER=1 (cam Sco38)
Teff=5.66h Tot=11 PER=0 (cam Min38)
Teff=4.53h Tot=07 PER=0 (cam Noa38) 
Teff=6.25h Tot=14 PER=3 (cam C3p8)  
----------------------------------------
On July 18/19 the activity of this radiant-area was of 
no value.

Please, check your observational data of these nights.

Best,
Enrico Stomeo
---
UAI-Sezione Meteore
http://meteore.uai.it