NGC 6888, HOO (Stephen Garretson)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: Crescent Nebula · HD192003 · HD192020 · HD192163 · HD192182 · HD192303 · HD192361 · HD228139 · HD228152 · HD228153 · HD228185 · HD228186 · HD228198 · HD228205 · HD228243 · HD228261 · HD228262 · HD228277 · HD228289 · HD228290 · HD228304 · HD228324 · HD228376 · LBN 203 · NGC 6888 · Sh2-105

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NGC 6888, HOO

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NGC 6888, HOO

Over a couple nights, actually very early mornings, I was able to collect 3 hours of OIII to add to the Ha on this target; here's the resulting HOO. I mix the two masters in specific ratios for each channel [RGB]. I'm particularly happy with how nicely the OIII shows up.

This image uses about 25% of the FOV. When I was running these scopes in the past I had ASI183MM Pros capturing the data. The current image is just a little bigger than what the 183 FOV would deliver. I'm using the 2600MM Pro cameras/filters/EFW/CTA combinations from two of the Borg 55s. This accomplishes two things: [1] I just spin these off the 55s and spin them on the 132 reducer/flatteners, and [2] I think the 2600MMs are a superior camera so I am getting better image quality. In any event, this procedure/configuration allows me to swap rigs in the Beevo Dome without too much hassle as long as I record details about positions of the various elements [counterweights, aimers, guider setup, D-bars, etc].

[17] 600s guided Ha subs
[18] 600s guided OIII subs
total integration: 5 hours 50 minutes

each scope/image train has the following:
William Optics FLT 132 APO with 0.8x flattener/reducer, runs at f/5.6 w/ effective focal length of 740mm
ASI 2600MM Pro
Gerd Neumann Camera Tilt Adjuster
ZWO EFW
Chroma 3nm narrowband filters
MicroTouch focus motor
Optec Libra Alt-Az Adjustment Base

Paramount MX+

TheSkyX, SGP, PHD2
PixInsight, Mac OS Photos, Preview

from the Beevo Dome

...Stephen

Original
Final
B

The refractors!

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Status	Advanced success
Started	...
Astrometry.net job	9802303
PixInsight job	OH8W0ZJMVI51MYXWS9GXODAZ1H0MX1GA
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	20h12m03s.22
RA (top/left)	20h10m31s.10
RA (top/right)	20h10m40s.74
RA (bottom/right)	20h13m34s.50
RA (bottom/left)	20h13m26s.63

Dec (center)	+38°17′48″.8
Dec (top/left)	+38°39′32″.1
Dec (top/right)	+37°54′45″.1
Dec (bottom/right)	+37°56′03″.4
Dec (bottom/left)	+38°40′48″.7

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NGC 6888, HOO

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