First light: LRGB of M45 (Anders Johannesson)

Celestial hemisphere: Northern · Constellation: Taurus (Tau) · Contains: 16 Tau · 17 Tau · 18 Tau · 19 q Tau · 20 Tau · 21 Tau · 22 Tau · 23 Tau · 24 Tau · 25 eta Tau · 26 Tau · 27 Tau · 28 Tau · Alcyone · Asterope · Atlas · Barnard's Merope Nebula · Celaeno · Electra · IC 349 · LBN 770 · LBN 771 · LBN 772 · M 45 · Maia · Maia Nebula · Merope · Merope Nebula · NGC 1432 · NGC 1435 · And 12 more.

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First light: LRGB of M45

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First light: LRGB of M45

I upgraded my old Sony A7S RGB camera to a ZWO ASI2600MM monochrome camera with a filter wheel. Yes, it is a downgrade in sensor size, but hopefully not in performance. This is the first time I try it out, thus the "First light" in the title. The target is good old M45, the Pleiades. This is also the first time I try to make an LRGB image based on separate filter exposures; L, R, G and B.

I found it to be a bit more tricky than using the RGB camera. There are many more images to keep track on this way, but more flexibility. Here I used 5 minute sub exposures for all filters. I also used the low noise gain setting of 100 in the camera. The total exposure time adds up to 2 hours with 8 L and B images and 4 R and G images. Flats in each color were made from the evening sky.

Comments and advice are welcome.

Happy New and Clear Year!

"Nordish by nature"

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Status	Advanced success
Started	...
Astrometry.net job	5355677
PixInsight job	NLH1I7XJ30S11FDQ8V2K18P6Q7738ACT
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	03h47m11s.67
RA (top/left)	03h52m06s.65
RA (top/right)	03h45m53s.90
RA (bottom/right)	03h42m15s.93
RA (bottom/left)	03h48m28s.63

Dec (center)	+24°01′02″.2
Dec (top/left)	+23°51′38″.8
Dec (top/right)	+25°06′44″.8
Dec (bottom/right)	+24°09′51″.6
Dec (bottom/left)	+22°55′19″.5

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First light: LRGB of M45

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First light: LRGB of M45

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