lior wrote:Tilvi,
This sounds great, and very important too. I have the following comments:
1. I believe that the light curve should be different for almost each meteor. The reason is that unlike stars, the light curve of a meteor is affected by the angle of the meteor towards the camera. For instance, if the meteor direction is exactly across the camera, it will look like a full long trail. However, if the meteor direction is exactly towards the camera, it will look like a very bright star, and no trail will be seen (what Dr. Brosch defines "flasher"). Most meteor trajectories are expected to be somewhere in between these two extreme cases. Therefore, two light curve might look completely different at concam even if the meteors are the same.
2. I'm not sure about looking only at the green line. The "PSF" of the meteor is definitley not sub-pixel. I would suggest to do some kind of averaging (I'm not yet sure which) for each pixel in the trail. If you don't do that, then the results are highly depended on the position of the trail within the pixel, which means a great deal of randomness. That is similar to the randomness that we get for C1 in the photometry files.
During our discussion yesterday, Dan came with idea that we can try taking profiles at the two edges of the meteor and one at the centre.
I have these light curves below taken by changin the x,y pixels at the start and end of the meteor. It is seen that the light curve peak slightly shifts, may be by 1 pixel.
x,y positions are follows
[204,523]:[218,539]
[203,523];[218,539]
204,524];[218,540]
And as Lior said, we can try averaging, but I also am not sure what type of averaging. Because averaging would introduce another error of double counting of pixel values.
Another concern here is that while subtracting the two frames, one with meteor and the other with the same sidereal time, if there is significant change in the background itself, it might affect the light cruve. But i think the trend would be the same, but the actual counts might differ.
thoughts?
![Image](http://www.phy.mtu.edu/~vpshetti/nsl/meteor3.jpg)