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Contains:  Ring nebula in Lyra, M 57, NGC 6720, IC 1296
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Messier 57, 





    
        

            Daniel.P

Messier 57

Technical card

Imaging telescope or lens:CELESTRON EdgeHD 8

Imaging camera:QHYCCD QHY8L

Mount:Sky-Watcher NEQ-6 PRO GoTo SkyScan

Guiding telescope or lens:Skywatcher ED 80/600

Focal reducer:Celestron .7x

Software:EZCapPixInsight PHD Guiding 2.5.0

Accessory:Orion Starshoot Auto-Guider

Resolution: 356x374

Dates:April 8, 2014April 9, 2014

Frames:
29x240" bin 1x1
10x240" -15C bin 1x1

Integration: 2.6 hours

Bias: ~20

Avg. Moon age: 8.84 days

Avg. Moon phase: 65.23%

Mean SQM: 21.00

Mean FWHM: 3.10

Astrometry.net job: 1139723

Locations: Duc, Prayssas, Lot et Garonne, France

Description

The B version is a zoom on the ing Nebulae with deconvolution applied.

Picture taken over 2 nights at two different focal length :
- 8 april : using the 0.7x focal reducer :10 x 240s
- 9 april at FD=10 ; 29 x 240 s

The frames at FD = 10 are not background limited : the read out noise is dominant.

The two pictures where processed separatly as follows :

Pre-processing done in Pixinsight :
- overscan area offset correction
- bias correction
- flat correction
- hot pixel correction
- debayer
- registration
- stack
Processing done in Pixinsight :
- color calibration using stars
- residual sky background substraction

Then the two resulting images where
- aligned using the FD=10 one as reference
- added using pixelmath
- converted to non linear image
- the nebulae was corrected using curves transformation
- color sat applied
- blue adjusted

Final image :
- jpeg calibration done in Mac Photo

Comments

Author

Daniel.P
Daniel.P
License: None (All rights reserved)
1890
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Revisions

  • Messier 57, 





    
        

            Daniel.P
    Original
  • Final
    Messier 57, 





    
        

            Daniel.P
    B

Histogram

Messier 57, 





    
        

            Daniel.P