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Contains:  Extremely wide field
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Crux - The Southern Cross Constellation and Coalsack Nebula, 





    
        

            Gabriel R. Santos...
Crux - The Southern Cross Constellation and Coalsack Nebula

Crux - The Southern Cross Constellation and Coalsack Nebula

Technical card

Resolution: 1200x1800

Dates:July 4, 2016

Frames: 11x240" ISO800

Integration: 0.7 hours

Darks: ~10

Bias: ~31

Avg. Moon age: 0.04 days

Avg. Moon phase: 0.00%

Mean SQM: 21.50

Mean FWHM: 4.70

Temperature: 5.80

Astrometry.net job: 1163216

RA center: 189.330 degrees

DEC center: -61.687 degrees

Pixel scale: 24.261 arcsec/pixel

Orientation: -174.514 degrees

Field radius: 7.289 degrees

Locations: Sítio, Cristina, MG, Brazil

Description

Constructive criticism, comments and suggestions are more than welcome in the comments section. Thank's for taking your time to look at this image.

Taken from Rural Skies (Bortle 3-4; NELM ~6.2; SQM ~21.55*), from Cristina, MG, Brazil (22ºS latitude).

Date and Time: July 4th, 2016, at 19:45 (7:45pm)
Camera: Unmodded Canon T5/1200D, at ISO 800
Lens: Nikon Nikkor 105mm f/2.8 AI Version, operated at f/4.0
Exposure Detail: 11x240s, or 1x4min, total 44 minutes

* -- A note about my SQM readings: --
. I do not own a Sky Quality Meter, it was calculated from a in-camera exposure of a region without the Milky Way, with a 40mm lens. The method is extensively described by Samir Kharusi (@ http://www.pbase.com/image/37608572). To me, the method sould be accurate, but I don't know if the recent improvement in camera technology might lead to a bit different results than Samir's calibrated ones. To me, my SQM calculations are a bit "too optimistic", and taking an exposure of a dark region of sky without the Milky Way yelds SQMs of 21.8-22.3, which is unrealistic IMO. As I've never been to a really dark sky I cannot state my sky quality precisely, however I think it is closer to 21.4-21.6, ~.2-.4 less than the calculation.

Comments

Author

grsotnas
Gabriel R. Santos...
License: None (All rights reserved)
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    Crux - The Southern Cross Constellation and Coalsack Nebula, 





    
        

            Gabriel R. Santos...
    Original
  • Crux - The Southern Cross Constellation and Coalsack Nebula, 





    
        

            Gabriel R. Santos...
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Crux - The Southern Cross Constellation and Coalsack Nebula, 





    
        

            Gabriel R. Santos...