M100 (Gernot Schreider)

Celestial hemisphere: Northern · Constellation: Coma Berenices (Com) · Contains: M 100 · NGC 4321 · NGC 4322 · NGC 4323 · NGC 4328

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M100

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M100

Imaging sessions were on March 22nd, 23rd, 24th and 26th 2022.
I think seeing was not good and as an effect guiding was not good. As a result I have rather fat stars. So I struggled really to get some good quality data. I did select 80% of acquired subs but the average FWHM was significantly higher than usual at 4.6 arcsec of the integrated non-processed image. Eccentricity was at 0.52 not really good e ither. Nevertheless I wanted to publish the image to document work and to document that in some cases things do not work as desired.
Since I had some misalignment of the subs over the four nights I had to crop the image as a first step of processing.
I had some difficulty to get the color visible and I am still not completely happy with the result although I did some fairly heavy processing.
Second difficulty was the overexposed core of the galaxy, which I tried to dampen during processing.
Now on the positive side there are quite a number of quasars (12) visible, which always wows me that this is possible with such modest gear.

Schmidt-Cassegrain Telescope (SCT) Imagers
Astrophotography Germany
Messier Objects

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Status	Advanced success
Started	...
Astrometry.net job	5656102
PixInsight job	U2S35A9VLACNT9O1771RPMON5T4ZQMQD
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	12h22m51s.378
RA (top/left)	12h22m06s.251
RA (top/right)	12h22m58s.900
RA (bottom/right)	12h23m36s.505
RA (bottom/left)	12h22m43s.848

Dec (center)	+15°49′09″.31
Dec (top/left)	+15°51′36″.75
Dec (top/right)	+15°38′09″.68
Dec (bottom/right)	+15°46′41″.46
Dec (bottom/left)	+16°00′08″.65

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