On this night, I drove out of the city to a semi-dark spot about 30 minutes away. It was forecast to be very transparent, according to ClearkDarkSky.com. Moonset was near 1:00 AM on Sunday morning, Oct 29, 2017, so I setup and took advantage of the dark time that was left and managed to shoot 3 comets before sunrise.
The first one was Comet Asassn. I processed it and created an initial star-streaks version, since it is the easiest to do. I still had a set of ISO 3200 sub-images to add in, but it looked fine to me with just the ISO 1600 data, so I left it as is. Plus, the two data sets did not mesh well with so many stars and the differing exposure times.
For the star-freeze version, I did add in the ISO 3200 data, which was 36×180 sec. Check it out:
Here is the full-field version of the above with a slightly different color balance and saturation level:
