M51 at just 620mm (Astrochromata)

Celestial hemisphere: Northern · Constellation: Canes Venatici (CVn) · Contains: IC 4277 · IC 4278 · M 51 · NGC 5194 · NGC 5195 · Whirlpool Galaxy

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M51 at just 620mm

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M51 at just 620mm

I shot this M51 image with my RASA 11" telescope at a focal length of just 620mm.

Given the full frame format of the ASI6200mm, this is just a tiny crop of the complete image.

I shot the L channel at 1x1 binning, the color channels at 2x2.

The 1x1 binning renders 1.25"/pixel at 620mm. Since I shot a lot of subs using drizzle, I could drizzle integrate the image in Pixinsight to double the resolution, rendering 0.62"/pixel.

Now 1,2" is about the usual seeing here, and the nights where I shot this target were not particulary good (on the contrary in fact). I was very suprised to see that still the drizzle revealed quite a bit more details!

Since the RASA is not exactly a galaxy telescope I was considering a second setup, but now I might just wait with that and get more experience in galaxy postprocessing and see what more is possible at this focal lenght.

Speaking with a friend, we asked ourselves if in mediocre seeing a shorter focal length telescope may give better results at these pixel scales. What do you guys think?

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Status	Advanced success
Started	...
Astrometry.net job	4409878
PixInsight job	3GGYZTFWBYES5ZZPVMAOI0ZBJSVIJA1O
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	13h29m56s.639
RA (top/left)	13h30m13s.762
RA (top/right)	13h31m35s.216
RA (bottom/right)	13h29m39s.795
RA (bottom/left)	13h28m17s.183

Dec (center)	+47°12′46″.28
Dec (top/left)	+47°35′01″.10
Dec (top/right)	+46°57′51″.19
Dec (bottom/right)	+46°50′30″.17
Dec (bottom/left)	+47°27′35″.76

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M51 at just 620mm

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M51 at just 620mm

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