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Contains:  Extremely wide field
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Part of the Cygnus Constellation - From Sadr to Deneb , 





    
        

            Gabriel R. Santos...
Part of the Cygnus Constellation - From Sadr to Deneb

Part of the Cygnus Constellation - From Sadr to Deneb

Technical card

Resolution: 1393x930

Dates:Aug. 30, 2014

Frames: 16x60" ISO3200

Integration: 0.3 hours

Avg. Moon age: 4.49 days

Avg. Moon phase: 21.13%

Temperature: 8.00

Astrometry.net job: 389519

RA center: 307.161 degrees

DEC center: 43.114 degrees

Orientation: -45.308 degrees

Field radius: 10.697 degrees

Description

This is my image of this beautiful Norhtern Constellation. In this image, through a 40mm lens (64mm FF equivlalent), part of the constellation is visible. The star due Left is Deneb, and the star near the centre is Sadr. Around this entire constellation there is a rich, astonishing region of red, Ha nebulosity. About the nebulae around Deneb, it's worth mentioning The North America Nebula (NGC 7000) and the Pelican Nebula (IC 5070). Around Sadr, there is another nebulosity field, and I would like to point out the Crescent Nebula, NGC 6888. In this wide field image it is almost invisible, but a simple search will show the beauty of this nebula. Astrobin has some exceptional images of this object.

Well, as my camera is not modified (it still has the stock filter that filters most of the Ha bandpass), I could only capture a tenth of what the true nebulosity is.

Apart from that, the image also features many other errors. For example, due to the extremely bad, 1st Light of the HEQ5 polar alignment, all I could get were 60s images, at 70mm. I've already discussed this in my SMC and C/2013 A1 image (http://www.astrobin.com/121146/), so I just copied some of those infos: Lots of things yet to be learnt, a poor polar alignment etc etc, led to a bad tracking function and a non-functional GoTo. Well, I had very few time that night, about 2 hours to set up, shoot and set down. I hope to get longer subs and integration time (about 1h), preferably with a modded camera next year, or perhaps in my next session, right after sunset.

Despite being a Northern Constalltion, this was shot from Down Under, at 22ºS. Cygnus, or the Swam, was very low in the sky when this was shot, about 20-30º altitude, and some light pollution was apparent in the images, creating a gradient in the bottom part of the frame. I tried to remove it in Post-Processing, but a bit of it is still visible. Another PS tool I used was to mask the nebulosity and push up the saturation a bit, so that it looked more reddish.

Here's some food for thought: Through this image, only a small part of the reality is visible. Isn't our vision, our comprehension like this? We can't even see the Ha nebulosity, and most of the stars in those pictures. To what extent do we truly know and see things?

Taken from Rural Skies (Bortle 3-4), from MG, Brazil. Thanks for seeing.

Camera: Unmodded T4i/650D at ISO 3200
Lens: Tamron 70-200mm f/2.8, at 70mm and f/3.2
Exposure Detail: 16x60s; or 16x1 minute; total 16 minutes.

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Author

grsotnas
Gabriel R. Santos...
License: None (All rights reserved)
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  • Part of the Cygnus Constellation - From Sadr to Deneb , 





    
        

            Gabriel R. Santos...
    Original
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    Part of the Cygnus Constellation - From Sadr to Deneb , 





    
        

            Gabriel R. Santos...
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Part of the Cygnus Constellation - From Sadr to Deneb , 





    
        

            Gabriel R. Santos...