NGC 5466 Globular Cluster in RGB under a bright moon (Greg Nelson)

Celestial hemisphere: Northern · Constellation: Boötes (Boo) · Contains: NGC 5466

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NGC 5466 Globular Cluster in RGB under a bright moon

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NGC 5466 Globular Cluster in RGB under a bright moon

This image was gathered on same nights as my previous post of M3. NGC 5466 was a little closer to the moon so it experienced a brighter sky background. Because of this, the chip was fully illuminated and almost had the quality of a very low intensity "flat". And, because the Gsense 4040 chip in the Aluma AC4040 camera experiences residual bulk image (at -5C I have measured a 300sec half life of RBI glow) this moon glow left a faint image of the polishing marks on the sensor. I processed these marks as much as I could into the background but alas I could not fully eliminate while maintaining good star profiles and retention of faint galaxies in the background (Polishing marks can be seen over the entire image, from bottom left toward top right).

So, If you are having difficulty calibrating images with this sensor, regardless of camera manufacturer (at least three vendors to date), RBI may be the root cause of the issue. Knowing this inherent "feature" of the sensor, care must be taken to closely match flat average illumination to your target's average illumination, darks need to be examined to assure you don't have RBI mismatches, and you will see "ghosts" of bright objects that can be minimized but not fully eliminated by dithering, depending on the intensity of the bright object.

Unfortunately the Aluma AC4040 does not have pre-flash capability...yet. And that option will raise the background noise so there is a tradeoff between the lowest possible noise that carries RBI issues and fixed pattern noise issues VERSUS pre-flash that should virtually eliminate the RBI but raise the noise floor.

The geometry and the pixel size of this sensor are perfect for the CDK. But we still await the perfect sensor.

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Status	Advanced success
Started	...
Astrometry.net job	5699853
PixInsight job	DX3MDPSZC1TGZXEYJ03M6N4FX97Z3WDN
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	14h05m28s.480
RA (top/left)	14h06m16s.718
RA (top/right)	14h06m09s.576
RA (bottom/right)	14h04m39s.962
RA (bottom/left)	14h04m47s.497

Dec (center)	+28°32′03″.85
Dec (top/left)	+28°23′04″.21
Dec (top/right)	+28°42′42″.90
Dec (bottom/right)	+28°41′04″.96
Dec (bottom/left)	+28°21′25″.24

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NGC 5466 Globular Cluster in RGB under a bright moon

NGC 5466 Globular Cluster in RGB under a bright moon

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NGC 5466 Globular Cluster in RGB under a bright moon

NGC 5466 Globular Cluster in RGB under a bright moon

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