2016 June 30 ~ Hydrogen gas clouds around the star Gamma Cygni
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Photographed at Algonquin Provincial Park, Ontario, Canada
(285 km by road north of Toronto)
* Temperature 11 degrees C.
* Total exposure time: 12 minutes.
For a version of this photo WITH LABELS, click on your screen to the RIGHT of the photo, or click here:
www.flickr.com/photos/97587627@N06/28023003682
Here is a photo of the equipment used to make these astrophotos:
www.flickr.com/photos/97587627@N06/27777670520
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Description:
High overhead in the northern hemisphere summer sky the Milky Way - our home galaxy - displays many clouds of red hydrogen gas and numerous star clusters.
An especially rich area surrounds the star Sadr - also known as Gamma Cygni - in the constellation Cygnus (the Swan).
The star Deneb: At the left edge of the frame is brilliant Deneb, the 19th brightest star in the sky. Deneb is so enormous that, if we were to view it from Earth's distance to our Sun, Deneb would stretch 60° across the sky! Deneb is also one of the most intrinsically luminous stars known; its light output is 200,000 times that of our Sun. It is also very far away; current estimates are about 2,500 light years; this compares with a few light years to a few dozen light years for most of the other bright stars that we can see in our sky.
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Technical information:
Nikkor AF-S 70 - 200 mm f/2.8 G ED VRII lens on Nikon D810a camera body, mounted on Astrophysics 1100GTO equatorial mount with a Kirk Enterprises ball head
Twelve stacked frames; each frame:
200 mm focal length
ISO 5000; 1 minute exposure at f/4.5; unguided
(with LENR - long exposure noise reduction)
Subframes registered in RegiStar;
Stacked and processed in Photoshop CS6 (brightness, contrast, levels, colour balance, colour desaturation)
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2016 June 30 ~ Hydrogen gas clouds around the star Gamma Cygni
******************************************************************************
Photographed at Algonquin Provincial Park, Ontario, Canada
(285 km by road north of Toronto)
* Temperature 11 degrees C.
* Total exposure time: 12 minutes.
For a version of this photo WITH LABELS, click on your screen to the RIGHT of the photo, or click here:
www.flickr.com/photos/97587627@N06/28023003682
Here is a photo of the equipment used to make these astrophotos:
www.flickr.com/photos/97587627@N06/27777670520
___________________________________________
Description:
High overhead in the northern hemisphere summer sky the Milky Way - our home galaxy - displays many clouds of red hydrogen gas and numerous star clusters.
An especially rich area surrounds the star Sadr - also known as Gamma Cygni - in the constellation Cygnus (the Swan).
The star Deneb: At the left edge of the frame is brilliant Deneb, the 19th brightest star in the sky. Deneb is so enormous that, if we were to view it from Earth's distance to our Sun, Deneb would stretch 60° across the sky! Deneb is also one of the most intrinsically luminous stars known; its light output is 200,000 times that of our Sun. It is also very far away; current estimates are about 2,500 light years; this compares with a few light years to a few dozen light years for most of the other bright stars that we can see in our sky.
___________________________________________
Technical information:
Nikkor AF-S 70 - 200 mm f/2.8 G ED VRII lens on Nikon D810a camera body, mounted on Astrophysics 1100GTO equatorial mount with a Kirk Enterprises ball head
Twelve stacked frames; each frame:
200 mm focal length
ISO 5000; 1 minute exposure at f/4.5; unguided
(with LENR - long exposure noise reduction)
Subframes registered in RegiStar;
Stacked and processed in Photoshop CS6 (brightness, contrast, levels, colour balance, colour desaturation)
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