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Contains:  Ring nebula in Lyra, M 57, NGC 6720, IC 1296
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Three Rings of M57, 





    
        

            Kevin Morefield
Three Rings of M57

Three Rings of M57

Technical card

Resolution: 1102x783

Dates:July 14, 2018

Frames: 166x1200"

Integration: 55.3 hours

Avg. Moon age: 1.62 days

Avg. Moon phase: 2.94%

Astrometry.net job: 2166850

RA center: 283.376 degrees

DEC center: 33.042 degrees

Pixel scale: 0.729 arcsec/pixel

Orientation: 323.724 degrees

Field radius: 0.137 degrees

Locations: Sierra Remote Observatory, Auberry, California, United States

Data source: Own remote observatory

Remote source: Sierra Remote Observatories

Description

This is a combination of data from my 16803 STX and 8300 STT at .73 and .43 image scales. I set out to capture the third ring with the large pixel camera but the filter wheel died mid-capture.

I ended up with 166 twenty minute exposures between the two cameras, using LRGB and SHO filters. Of course, the ring itself is many magnitudes brighter than the 2nd and 3rd rings so I had to combing each from different stretches and from different filter combinations. For example, the luminance from the 3rd ring is Ha from both cameras, the luminance channel for the main ring is all narrowband. Color is from the RGB. 55 hours of data when into the mix in one form or another.

I had trouble getting the data at different scales to register so a master from each camera was created and these were manually aligned and scaled in CCDStack. Layer blending was done in Photoshop CC. The narrowband luminance channel for the main ring was created in PI. Whatever worked...

Much was learned trying to do this!

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Author

morefield
Kevin Morefield
License: None (All rights reserved)
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Three Rings of M57, 





    
        

            Kevin Morefield