The Perseids have been and gone, maximum hourly count was 28 between 2-3 pm on the 12th and the max daily count was 313 on the 13th. The hourly plot between 10th and 16th shows the daily shower distribution quite clearly, maximum activity picking up for 2pm onwards on most days , hence not many being seen, also the majority of counts were of low duration, so most not very bright, there were some longer duration signals associated with fireballs but not many and certainly not bright enough to trigger the all sky camera which I had running when sky was clear.( which wasn’t very often)
The Barton All Sky & Meteor Observatory (BASMO) is now operational with the addition of the All Sky camera and realignment of aerial which has started to work loose in mount. The radio section detects the reflections of the Graves Radar signal (near |Dijon) 143.05 MHz detected using the Yagi aerial( az 140 deg , inclination 20 deg) connected to a Fundongle pro+ and signal processed using SpectrumLab on laptop. The Allsky camera runs using Ispy and is set to record video if motion detected in the selected sectors. Unfortunately the All sky camera will not show the meteors detected by the radar ( usually over southern England/ channel/ France)
Images below as follows:
- BASMO aerial and Allsky camera
- BASMO attachment of camera using wickes bracket suggested by Ed
- BASMO Meteor detection top, allsky camera feed bottom.
- Radar meteor detection, long duration trace as meteor “burns” up leaving ionised trail
- Radar meteor detection showing Doppler shift of approx. 100Hz as meteor approaching Graves signal slows in atmosphere.
- BASMO All Sky camera pointers.
- All sky camera and rain drops, design fault ,Ed forgot to include wiper blades!
Click on the links to show videos .
- Video clip showing effect of raindrops, giving false movement as security light comes on. falsemove
- Video clip showing Plane overhead. Plane
- Video clip showing Meteor trace, probably a Draconid. Meteor
Here is the July meteor data based upon radar backscatter from Graves. As commented by http://meteorshowersonline.com/july_radiants.html
“Although the July radiants do not individually produce strong rates, activity from the Aquarius and Capricornus regions in July and early August, as well as minor activity from other radiants, cause hourly rates to basically rise between the middle and end of July for observers in both the Northern and Southern Hemispheres. Therefore, clear, moonless nights can be quite enjoyable for anyone observing during late July. “
there is a definite increase in activity towards end of month, where we are also entering the Perseid stream ( July 23 – Aug 22nd) and there has been a noticeable increase in fireballs picked up by NASA all sky monitors ( see Spaceweather.com)
|Southern Delta Aquarids (SDA)||July 14-August 18||July 28/29|
|Alpha Lyrids||July 9-20||Jul. 14/15|
|July Phoenicids (PHE)||July 9-17||Jul. 14/15|
|Alpha Pisces Australids||July 16-August 13||Jul. 30/31|
|Sigma Capricornids||June 18-July 30||Jul. 10-20|
|Tau Capricornids||June 2?-July 29||Jul. 12/13|
|Omicron Draconids||July 6-28||Jul. 17/18|
I have also combined last years daily counts with this years for comparison:
although the count rates vary, there is some mirroring of variation early in the month, but there appears to be an increase rather than decrease in activity during the latter stages of the month. Notice also the diurnal nature of activity, particularly during the second half of the month, where activity is very high during the early hours of the day ( see Hourly meteor rate) .This is a good pointer to observing the Perseids later this month, with peak activity from midnight , through the early hours of the 12-13 Aug, a waning Gibbous moon will be rising around midnight which might interfere with viewing, but it stays relatively low in the sky as the Perseid radiant climbs higher. The shower is active from July 23 till Aug 22nd with best views during the nights of the 11, 12 and 13 Aug. Definitely worth getting those all sky cameras we have made up and running to record shower activity.
Click on link below to download Ed’s powerpoint from today’s All Sky Camera Workshop (Powerpoint .pptx file)
What an exiting morning! Hats off to Ed Mann for organising such a fantastic session. Thanks Ed!
This is the second if two workshops – for those who could not make the first and for those from first needing extra help.
A great idea – an All Sky Camera is one which takes picture of the whole sky – brilliant for meteor observing during showers or for cloud monitiring.
The camera is protected by a dome against the weather and needs an inbuilt dew heater. The camera boards Ed chose use Ethernet so can be accessed on a network.
Here is the Powerpoint presentation I used for the All Sky Camera workshop