The Whale & Crowbar (John Noble)

Celestial hemisphere: Northern · Constellation: Canes Venatici (CVn) · Contains: HD111180 · NGC 4627 · NGC 4631 · NGC 4656 · NGC 4657 · Whale Galaxy

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The Whale & Crowbar

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The Whale & Crowbar

The last galaxy shot of the season I think shot from the back yard with my tandem rig. WO FLT 132 at f7 for luminance and WO FLT 91 at f4.5 for RGB and Ha. I switched to the full focal length of the FLT 132 just to see how much difference it made to the resolution. The FWHM as measured in PI dropped from ~2.75 to 2.3 so about a 16% improvement compared to a 28% increase in focal length which I guess tells me somewhere between 660 mm and 910 mm I'm hitting the limitation of my back yard set up. Interestingly I hadn't seen this gain in previous shots at f7 and 910 mm with the 132 which is why I was shooting at f5 and 660 mm. Also over 8 hours of luminance I felt the signal was more than good enough so I guess I'll shoot at f7 going forward!

I shot some Ha just for the heck of it and I was really pleased with the accents it brought to the galaxies especially the whale.

Anyway here's the exposure data:

Luminance FLT 132 f7 96 by 300 s
RGB FTL 91 at f4.5 24 by 300 s each
Ha FLT 91 at f4.5 12 by 300 s

Multiscope Setup
ZWO ASI2600MM Pro
ZWO ASIAIR PRO USERS
Suburban Astrophotography

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Status	Advanced success
Started	...
Astrometry.net job	7629304
PixInsight job	NIGW6NE4952R6MU9HC2QM2KGET4WHH14
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	12h43m04s.64
RA (top/left)	12h38m34s.26
RA (top/right)	12h46m40s.56
RA (bottom/right)	12h47m38s.42
RA (bottom/left)	12h39m25s.70

Dec (center)	+32°22′21″.3
Dec (top/left)	+31°58′18″.4
Dec (top/right)	+31°40′15″.9
Dec (bottom/right)	+32°45′46″.8
Dec (bottom/left)	+33°03′59″.9

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