Some photometry

After a very long period of cloudiness there was a clear night, but with a heavy surface fog. Visibility in the ground level was 250m in the near by airfield.

I took 30 * 2 min exposures with Johnson V -filter of the comet C/2012 V2 (LINEAR) and put them to MaximDL's photometry tool.

Here's the graph.

C/2005 L3 (McNaught) and C/2007 Q3 (Siding Spring)

On monday weather forecast was clear sky but I gave up at midnight because sky still was filled with clouds. Yesterday forecast was cloudy but sky was almost clear until 10pm. There were scattered clouds so I didn't even try any deep sky imaging. So I aimed my scope to few comets!

First one I was going to image on monday. Or actually I was going to image M94 but the McNaught was right beside it. On tuesday they still were so close that I got them to same field. I knew that the comet was quite faint, on mid January it was measured to be at magnitude 14.9 but I wanted to try to capture it.

Comet is on right and slightly up of the galaxy (M94). Exposure was 4*2min + 1*5min of luminance (bin3*3).

I tried to measure comet's brightness and here's the result (red line. Others are magnitudes of reference stars):

Another one that I had time to image was C/2007 Q3. This is one of the brightest comets on the northern hemisphere at the moment. It was mag 11.1 about month ago.

This is combination of 5*2min exposures binned 2*2 (L).

And here's photometry: (which is quite weird because comet's should be brighter than mag 10...)