USA 198 r/b passing the M33 galaxy

click image to enlarge

Last Thursday evening was very clear. I tested a clip-in CLS filter on my Canon EOS 60D, employing the 2.8/180mm Zeiss lens and a motorized tracking mount.

One of the targets was M33, a big galaxy in Triangulum. As it happened (it was not planned), I captured a classified object in the series: the USA 198 r/b (2007-060B). It can be seen passing M33 in the image above, which is a stack of several 20-second images (breaks in the trail represent short moments inbetween consecutive exposures).

As the images do not have the timing accuracy of my usual tracking images, they are probably of little use for astrometry. But I do seem to see some slight brightness variation, so I might try to construct a brightness curve.