LBN683 and lots of galaxies (Robin Livermore)

Celestial hemisphere: Northern · Constellation: Ursa Major (UMa) · Contains: 22 UMa · 24 UMa) · 24 d UMa · 27 UMa · Bode's Galaxy · Cigar Galaxy · HD72962 · HD73190 · HD73797 · HD74904 · HD75632 · HD76023 · HD76347 · HD77426 · HD77724 · HD77833 · HD78633 · HD78696 · HD78935 · HD79315 · HD79907 · HD80259 · HD80354 · HD80365 · HD80532 · HD81438 · HD81936 · HD82171 · HD82602 · HD82685 · And 47 more.

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LBN683 and lots of galaxies

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LBN683 and lots of galaxies

With some clear nights forecast in late February, I thought I'd try for a large mosaic of eight panels covering this huge area of IFN, categorised by Beverley Turner Lynds as LBN683. This seemed like a good use of the RASA with the milky way out of reach in the early hours, but I was perhaps fortunate to get all of the panels completed over 4 consecutive nights (unusual in Wales!).

As a bonus, you get M81 and M82, and various other galaxies dotted around. I processed starless, and tried not to overcook the galaxies too much, but they are quite bright. Perhaps that helps in a large panorama, I don't know. I need more practice at using GAME and other masking techniques I guess, but this is my end result for now at least.

I've been having trouble with my calibration recently, particularly the introduction of some fairly extreme colour gradients, exacerbated by vignetting. The mosaic makes these issues more obvious. This led to a lot of work with DBE, and still the need after that to reduce saturation on the main part of the image, while boosting it in the larger galaxies. I know OSC images can be difficult to calibrate, but this is broadband, and I suspect I can improve mine with some experimentation - e.g. different length flats for RGB, my R signal is much weaker in the flats than the green.

Celestron RASA
ZWO ASI2400MC Users

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Status	Advanced success
Started	...
Astrometry.net job	7359826
PixInsight job	VC93DV4MIMQ3R57RR2PY6KVEEA7K9LY7
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	09h27m25s.58
RA (top/left)	10h19m26s.78
RA (top/right)	08h37m43s.55
RA (bottom/right)	08h47m28s.88
RA (bottom/left)	10h04m20s.31

Dec (center)	+70°52′05″.9
Dec (top/left)	+73°08′11″.5
Dec (top/right)	+73°29′21″.7
Dec (bottom/right)	+67°53′33″.6
Dec (bottom/left)	+67°37′28″.2

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LBN683 and lots of galaxies

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LBN683 and lots of galaxies

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