My horizon for many objects limits the amount of time I have
to image an object as it passes from the high trees to the east to the house
roofline on the west. After I’ve subtracted time spent dithering ( a
significant amount, if you’re using short exposures like I do) and removed
frames made unusable by passing clouds, satellites, alien spaceships and astral-traveling
Tibetan monks, the final integration may only have captured 50%-60% of the time
I was actually at the scope. In this case, I managed to get 43 minutes of
usable data from my captures. Clouds were the main culprit and these images
were captured through holes in about 70% cloud cover. My goal was to capture
NGC 4302, which I did; but there were a number of other interesting objects in
the captured field. The first image shows the full field as captured by the RASA/DS10C.
The second is a crop of NGC 4302 and NGC 4298. The third image shows a crop of NGC
4524—a beautiful spiral. The fourth image is an annotated image of some of the
objects in the field. I’ve noticed several that astrometry.net did not seem to
identify; perhaps they were too faint.
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