M101 The Pinwheel Galaxy LRGB with Ha (Greg Nelson)

Celestial hemisphere: Northern · Constellation: Ursa Major (UMa) · Contains: M 101 · NGC 5447 · NGC 5449 · NGC 5450 · NGC 5451 · NGC 5453 · NGC 5455 · NGC 5457 · NGC 5461 · NGC 5462 · NGC 5471 · NGC 5477 · Pinwheel galaxy

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M101 The Pinwheel Galaxy LRGB with Ha

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M101 The Pinwheel Galaxy LRGB with Ha

The beautiful Pinwheel Galaxy. This data was gathered during the "shoulders" of the last lunar cycle with the Ha collected when the moon was up, and the LRGB during dark hours. This image is my first broadband image that I was able to correctly calibrate without residual fixed pattern noise from the Aluma AC4040 GSENSE 4040 CMOS chip. Thanks to @Howard Trottier for the tip to lower the average brightness of the flat subs to match the average brightness of the light subs. There is clearly some nonlinear behavior characteristic of this chip around 50% saturation but going to 10-15% saturation for flats seems to get closer to a linear range.

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Status	Advanced success
Started	...
Astrometry.net job	5577771
PixInsight job	7YT532F8BCQFYYJHWZHQ683MZKJXASTS
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	14h03m24s.110
RA (top/left)	14h04m28s.350
RA (top/right)	14h05m51s.778
RA (bottom/right)	14h02m18s.248
RA (bottom/left)	14h00m57s.250

Dec (center)	+54°21′45″.84
Dec (top/left)	+54°00′19″.32
Dec (top/right)	+54°31′08″.77
Dec (bottom/right)	+54°43′11″.40
Dec (bottom/left)	+54°12′10″.65

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M101 The Pinwheel Galaxy LRGB with Ha

M101 The Pinwheel Galaxy LRGB with Ha

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M101 The Pinwheel Galaxy LRGB with Ha

M101 The Pinwheel Galaxy LRGB with Ha

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