M51 (Rob Foster) - AstroBin

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

Revision title: Drizzle 2x Version, back to single camera

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M51

Revision title: Drizzle 2x Version, back to single camera

A favorite winter target, the Whirlpool Galaxy (also known as M51 and NGC 5194) is adjacent to the smaller companion galaxy NGC 5195. M51 is a grand design spiral galaxy (well-defined and prominent arms) in the constellation Canes Venatici approximately 31 million light years from Earth. At Dec +47, M51 is a circumpolar target above the 43rd parallel. Although this particular image did not capture discrete Ha data, there is a hint of some element of it in the larger spiral arms, particularly the arm leading out to the prominent Northwest Plume tidal arm extending towards NGC 5195.

Original
B
D
Final
E

B

Title: Cropped Version

Uploaded: ...

D

Title: Combining Mono Imaging with 2 years of OSC DSLR imaging

Description: Weaving in old DSLR OSC data is trickier than I would have imagined. The only difference between this image and Version B is the addition of 13+ hours of OSC data, going back and re-generating appropriate sub-frames prior to registration. Lesson Learned: Save the Masters, but also save the last step immediately prior to registration (debayer folder in this case) to save additional processing later.

Uploaded: ...

E

Title: Drizzle 2x Version, back to single camera

Description: The first version was way over sharpened when developing the luminance channel, and the combined mono and OSC data was over saturated. Trying to fix those faults by going back, starting with Drizzle 2x data and only processing the mono images and paying careful attention to the sharpening particularly with BXT. Even then, I had to "rescue" some of the stars just outside the edge of the galaxy which were problematic with surrounding dark halos.

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The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

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Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
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Status	Advanced success
Started	...
Astrometry.net job	9288649
PixInsight job	BCGUWVTLVZLJ4TUVXX82CGSEOXWDJAZP
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	13h29m47s.361
RA (top/left)	13h28m53s.991
RA (top/right)	13h28m53s.100
RA (bottom/right)	13h30m40s.367
RA (bottom/left)	13h30m42s.840

Dec (center)	+47°12′43″.62
Dec (top/left)	+47°24′25″.80
Dec (top/right)	+47°01′11″.91
Dec (bottom/right)	+47°01′00″.75
Dec (bottom/left)	+47°24′14″.59

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M51

Revision title: Drizzle 2x Version, back to single camera

M51

Revision title: Drizzle 2x Version, back to single camera

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M51

Revision title: Drizzle 2x Version, back to single camera

M51

Revision title: Drizzle 2x Version, back to single camera

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