Clear skies, but muggy and lots of muck to shoot through with it that low. It was the clearest morning so far since the comet became visible. That’s a dirt pile in the foreground, btw and not a mountain. LoL!

Below is an image that is a reprocess job on the data with a different color balance, slightly more sub-images and tighter cropping.   I also did dark and offset calibration to try and reduce noise.

I was hoping it would come out better than the first one, but since conditions were sub-par to begin with,  I guess I will just have to wait until it gets in the evening skies to get a better shot.  Oh, well…

Looks like Comet ATLAS was a dud.  It broke up into pieces after it had brightened much higher than predicted last month.  The brightening and breakup so soon afterwards indicates a large release of material from inside the object as it cracked open, so to speak.

By the time I took this pic, there were at least 3 to 5 major pieces in a line and the out-gassing of volatiles available was over with.   Just rock and dust was all that was left.

I fought clouds on Mar 27, 2020 and also two nights before that on Mar 25, 2020.  The March 27th session produced this image.  The image data from the 25th was not worth posting.  This image, even though it is only a few minutes of exposure that I pieced together, was decent enough to post online.  Better than nothing, I suppose.

I am hoping that better conditions are coming soon.  I need to get a continuous set of  sub-images for this comet instead of having to put together a hodgepodge of exposures taken between bouts of cloud cover.

A new comet is in our neighborhood passing by at a relatively close 28 million miles from Earth.  It is a very long period comet that we have not seen before, but it has visited the inner solar system over 1300 years ago.  However, nobody noticed it because it was probably too dim to see naked eye.   It was discovered late last year by Japanese astronomer Masayuki Iwamoto.

Below is the Star-Streaks version with minimal processing.   Both images were treated minimally in these first iterations of processing.  There is probably room for improvement, but I doubt I’ll get much more than what I have here.

I shot this from a Bortle Red/White zone in the middle of a metro area.   It was moving so fast that even 30 sec shots showed trailing.   So, I went with ISO 3200 and 30 sec exposures even though it trailed a bit, which was about max for the sky conditions I had this night.  I shot some 1 minute subs while trying to guide on the comet, but my DEC calibration was not working, so they showed some trailing in DEC.  Plus, I was barely able to pick it up with 4 sec subs, so it was not tracking too well at that setting.

These two didn’t come out too bad, I guess.   A darker location would have shown the tail better, probably and there is some hint of it here.  Reports are the comet can be seen in binoculars from dark sites, which is pretty good for any comet.   But, I knew from experience that when they are barely visible in binos from dark sites, binoculars are almost useless from inside a metro area, so I didn’t even try.

So far, I’ve managed to image Comet 46P/Wirtanen four times during this apparition with my TV-85 scope and twice with camera lenses.  For this time of the year, that is pretty good.   December and January are usually months of unending rain and clouds down here in Cajun Country.

Now that the main part of Comet Wirtanen’s visit is over, it is a good time to do a roundup of the data and see the bigger picture.   So, I took the best four star-freeze versions from those four times with the telescope and combined them into one display image above.    That way, you can easily compare the shape of the comet and see how it changed depending on our angle of view at the time.

The dust and ion tails were both mostly hidden behind the huge coma on this comet.  It was huge because it was so close to us.   But, since it was still further from the Sun than we are and the Sun, Earth and comet were in a line, the tails were pointing directly away from us.   That foreshortens the length of the tail and makes it look like it doesn’t even have one at times.   It is just the geometry of the view angle and the way the coma can overwhelm the dim tails when they are behind it from our vantage point.

When we were more at an angle to the Sun-comet angle, the tail appeared longer.   When we were in-line with it and the Sun, the tail decreased.   So, it is not totally comet activity at this point that controls tail length, it is view angle and how much is behind a thick coma.   You still have the solar wind and how chaotic it is that causes the tail to “flap” like a flag when the wind varies.  But, mostly view angle.

46P came in low going high and crossed our orbit then angled above the elliptic plane heading away from the Sun.  Our view now is from underneath, you would say.   That is why the tail is south now when it was mostly on the north side when it was below the elliptic.