The Rho Ophiuchi Cloud Complex - a photo on Flickriver

About this image:
A widefield mosaic of the large Rho Ophiuchi Nebular Cloud Complex. Rho Ophiuchi is a dark nebula of gas and dust that is located 1° south of the star ρ Ophiuchi of the constellation Ophiuchus (close to the red Supergiant star Antares).

About the Interstellar Cloud Colors:
Fine dust illuminated from the front by starlight produces blue reflection nebulae. The atoms of gaseous clouds that are excited by ultraviolet starlight produce reddish emission nebulae. Back-lit dust clouds block light and appear dark. Antares (a red supergiant star, and one of the brighter stars in the night sky), lights up the yellow-red dust clouds. Rho Ophiuchi lies at the center of the blue nebula. Interstellar clouds are even more colorful than we can see in visible light, emitting light across a large portion of the electromagnetic spectrum.

Gear:
William Optics Star 71mm f/4.9 Imaging APO Refractor Telescope.
William Optics 50mm Finder Scope.
Celestron SkySync GPS Accessory.
Orion Mini 50mm Guide Scope.
Orion StarShoot Autoguider.
Celestron AVX Mount.
QHYCCD PoleMaster.
Celestron StarSense.
Aurora Flatfield Panel.
Optolong 36mm LRGB & SHO filters.
QHYCFW2-M-US Filterwheel (7 position).
QHY163M Cooled CMOS Monochrome Astronomy Camera.

Lights/Subs:
Mosaic photographed using Optolong LRGB filters.
L = 36 x 180 sec. per filter / per mosaic panel.
R = 24 x 180 sec. per filter / per mosaic panel.
G = 24 x 180 sec. per filter / per mosaic panel.
B = 24 x 180 sec. per filter / per mosaic panel.

Enhanced emission lines:
Optolong L-Pro used for Luminance (instead of default L filter).
OIII (496, 500nm).
H-Beta (486nm).
NII (654, 658nm).
H-Alpha (656nm).
SII (672nm).
Infrared cut-off (700-1100nm).

Imaged with the QHY163M Unity Gain Settings:
Gain = 12
Offset = 60
CMOS Cooled to -25°C

Calibration Frames:
50 x Bias/Offset.
30 x Darks.
20 x Flats and Dark Flats.

Image Acquisition:
Sequence Generator Pro via the Mosaic and Framing Wizard.
Plate Solving in SGP via the Astrometry.net ANSVR Solver.
Autoguiding via Open PHD Guiding.

Processing:
Pre-Processing and Linear workflow in PixInsight,
and finished in Photoshop.

Astrometry Info:
View an Annotated Sky Chart of this image.
Center RA, Dec: 249.146, -24.140
Center RA, hms: 16h 36m 34.922s
Center Dec, dms: -24° 08' 22.364"
Size: 8.75 x 6.19 deg
Radius: 5.356 deg
Pixel scale: 17.5 arcsec/pixel
Orientation: Up is 196 degrees E of N
View this image in the World Wide Telescope.

Martin
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Taken on: August 24, 2017

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