C/2017 O1 ( ASASSN ) on Oct 29, 2017

C/2017 O1 ( ASASSN ) on Oct 29, 2017, 05:40 UT. 21×180 sec @ ISO 1600, IDAS-LPS, Canon T4, TV-85 at F/5.6.

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:

Comet Asassn. 36×180 sec @ ISO 3200 and 21×180 sec @ ISO 1600. TV-85 at F/5.6, Canon T3, IDAS-LPS filter. Cropped version.

Here is the full-field version of the above with a slightly different color balance and saturation level:

Comet Asassn. 36×180 sec @ ISO 3200 and 21×180 sec @ ISO 1600. TV-85 at F/5.6, Canon T3, IDAS-LPS filter.

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