The Coalsack Dark Nebula (C99)
About this image
A widefield mosaic of the Coalsack Dark Nebula, also simply called the Coalsack (C99). It is the most prominent Dark Nebula in the sky, easily visible to the naked eye as a dark patch silhouetted against the Milky Way in the Southern Hemisphere. C99 is located at a distance of approximately 600 light-years away from Earth, in the constellation Crux. The large hot bright blue star is Alpha Crucis (Acrux), the bottom star of the Southern Cross asterism.
About Star Colors:
You will notice that star colors differ from red, orange and yellow, to blue. This is an indication of the temperature of the star's Nuclear Fusion process. This is determined by the size and mass of the star, and the stage of its life cycle. In short, the blue stars are hotter, and the red ones are cooler.
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.
Canon 60Da DSLR.
Astronomik Clip-In CLS Light Pollution Filter.
Tech:
Guiding in Open PHD 2.6.3.
Image acquisition in Sequence Generator Pro.
Lights/Subs:
18 x 180 sec. per Panel (4 Panel Mosaic)
ISO 3200 RGB (CLA FITS)
Calibration Frames:
30 x Bias/Offset.
30 x Darks.
30 x Flats & Dark Flats.
Image Acquisition:
Sequence Generator Pro with the Mosaic and Framing Wizard.
Plate Solving:
Astrometry.net ANSVR Solver via SGP.
Processing:
Pre-Processing and Linear workflow in PixInsight,
and finished in Photoshop.
Astrometry Info:
View an Annotated Star Chart for this image.
Center RA, Dec: 188.566, -63.309
Center RA, hms: 12h 34m 15.859s
Center Dec, dms: -63° 18' 32.937"
Size: 2.7 x 2.06 deg
Radius: 1.699 deg
Pixel scale: 6.07 arcsec/pixel
Orientation: Up is 89.6 degrees E of N
View this image in the World Wide Telescope.
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Flickr Explore:
Martin
-
[Home Page] [Photography Showcase] [My Free Photo App]
[Flickr Profile] [Facebook] [Twitter] [My Science & Physics Page]
The Coalsack Dark Nebula (C99)
About this image
A widefield mosaic of the Coalsack Dark Nebula, also simply called the Coalsack (C99). It is the most prominent Dark Nebula in the sky, easily visible to the naked eye as a dark patch silhouetted against the Milky Way in the Southern Hemisphere. C99 is located at a distance of approximately 600 light-years away from Earth, in the constellation Crux. The large hot bright blue star is Alpha Crucis (Acrux), the bottom star of the Southern Cross asterism.
About Star Colors:
You will notice that star colors differ from red, orange and yellow, to blue. This is an indication of the temperature of the star's Nuclear Fusion process. This is determined by the size and mass of the star, and the stage of its life cycle. In short, the blue stars are hotter, and the red ones are cooler.
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.
Canon 60Da DSLR.
Astronomik Clip-In CLS Light Pollution Filter.
Tech:
Guiding in Open PHD 2.6.3.
Image acquisition in Sequence Generator Pro.
Lights/Subs:
18 x 180 sec. per Panel (4 Panel Mosaic)
ISO 3200 RGB (CLA FITS)
Calibration Frames:
30 x Bias/Offset.
30 x Darks.
30 x Flats & Dark Flats.
Image Acquisition:
Sequence Generator Pro with the Mosaic and Framing Wizard.
Plate Solving:
Astrometry.net ANSVR Solver via SGP.
Processing:
Pre-Processing and Linear workflow in PixInsight,
and finished in Photoshop.
Astrometry Info:
View an Annotated Star Chart for this image.
Center RA, Dec: 188.566, -63.309
Center RA, hms: 12h 34m 15.859s
Center Dec, dms: -63° 18' 32.937"
Size: 2.7 x 2.06 deg
Radius: 1.699 deg
Pixel scale: 6.07 arcsec/pixel
Orientation: Up is 89.6 degrees E of N
View this image in the World Wide Telescope.
Flickr Explore:
Martin
-
[Home Page] [Photography Showcase] [My Free Photo App]
[Flickr Profile] [Facebook] [Twitter] [My Science & Physics Page]