Comet Johnson, Feb 26, 2017

Comet Johnson, Feb 26, 2017, 08:35 UT. 18×180 sec @ ISO 3200, TV-85 at F/5.6, Canon T3, Atlas EQ-G w/EQMOD. Star Freeze version.
Comet Johnson, Feb 26, 2017, 08:35 UT. 18×180 sec @ ISO 3200, TV-85 at F/5.6, Canon T3, Atlas EQ-G w/EQMOD. Star Streaks version.

I was able to catch 4 comets on the night of Feb 25/26th, 2017.  Comet Johnson was the last one of the night and I got some good data on it this time.

I have processed the data like usual and included both a star freeze and star streaks version.    I cropped these close at 100% full size.

The full frame is below:

Comet Johnson, Feb 26, 2017, 08:35 UT. 18×180 sec @ ISO 3200, TV-85 at F/5.6, Canon T3, Atlas EQ-G w/EQMOD. Star Freeze full frame version.

 

Update Feb 27, 2017:
I actually made a mistake on processing these and the exposure time involved.   There are only two (2) sub-images that were shot for 3 minutes at ISO 3200 (the first two) and the remaining sixteen were all 5 minute subs at ISO 1600.   Doh!  😮

Update Feb 28, 2017:
I had processed them with the 180 sec, ISO 3200 darks and offsets and it still came out.   I wrongly stated to myself (and this blog) that I would not reprocess them with the right calibration data, since it looked good enough.  However, I’m glad I changed my mind:

Comet Johnson, Feb 26, 2017, 05:00 UT. 16×300 sec @ ISO 1600, TV-85 at F/5.6, Canon T3.

This was much cleaner in the reprocess.  I have two layers here.  One is the comet and one is the star background.  I didn’t have to slice and dice 10 different processing attempts and put together an image.  I only used the minimum needed.   Nothing from the first processing job was used.

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