Blog Archive

Meteors

I took this photo while I was asleep! More accurately, it is a processed capture from an automatic system. This is a perseid meteor, passing close to the Pleiades.

I am now running a video meteor observation system and am proud to contribute the data to the UK Meteor Observation Network (ukmon). There is a basic cctv camera, fixed so that it is pointed SSE and up towards the sky, housed in a proper weatherproof case. The video is fed to a cheap usb video capture card and then to the same PC that runs the weather station. This runs software from the sonotaco group in Japan. The software receives the video and records it continuously, discarding it continuously 30 seconds or so later unless it has detected specific kinds of change in the shot – i.e. a meteor travelling across the frame. When this happens, the recording is sent to a file and details of the time are logged. Later, other software is used to analyse the meteor trail to calculate its exact position against the sky. When the data is shared, software is used to match observations of the same meteor from more that one site. This allows highly accurate positions to be calculated for the meteor and even allows its orbit to be determined.

It is surprising how many meteors the system captures: well over 200 in the six nights it has been running (which have included quite long periods of cloud). It helps that this is the peak of the perseids meteor shower. Although the full moon has interfered, I have been delighted to see how many meteors have been captured and down to about magnitude 2.

As well as video, the system captures a snapshot of the meteor. All snapshots, and details of all the meteors captured, are at ukmon:

Horley Meteor Station Archive

I will post some more videos of the more spectacular meteors on this site from time to time.