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The Blue Horsehead Nebula | by Martin_Heigan
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The Blue Horsehead Nebula

The Blue Horsehead Nebula (IC 4592) is a very faint reflection nebula in the constellation Scorpius, that is lit by the multiple Star System Nu Scorpii.



William Optics Star 71mm f/4.9 Imaging APO Refractor Telescope.

Celestron SkySync GPS Accessory.

Orion Mini 50mm Guide Scope.

Orion StarShoot Autoguider.

Celestron AVX Mount.

QHYCCD PoleMaster.

Celestron StarSense.

RoboFocus RF3 Focuser.

Optolong L-Pro & RGB filters.

QHYCFW2-M-US Filterwheel (7 position x 36mm).

QHY163M Cooled CMOS Monochrome Astronomy Camera.



Guiding in Open PHD 2.6.5.

Image acquisition in Sequence Generator Pro.



Imaged at -20°C

QHY Sensor Sensitivity:

Gain: 120

Offset: 35

Imaged in LRGB:

L = 18 x 180 sec.

R = 14 x 180 sec.

G = 14 x 180 sec.

B = 16 x 180 sec.

Calibration Frames:

50 x Bias/Offset.

20 x Darks.


Image Acquisition:

Sequence Generator Pro.



Pre-Processing and Linear workflow in PixInsight,

and finished in Photoshop.


Sky Conditions:

Unihedron Sky Quality Meter:

SQM-L Value: 20.5


Astrometry info:

Center RA, Dec: 243.135, -19.395

Center RA, hms: 16h 12m 32.442s

Center Dec, dms: -19° 23' 41.570"

Size: 2.46 x 1.8 deg

Radius: 1.521 deg

Pixel scale: 5.53 arcsec/pixel

Orientation: Up is 96 degrees E of N

View an Annotated Sky Chart for this image.




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Uploaded on July 23, 2018