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Bat & Squid - Natural Relative Intensities, 


            Jon Rista
Bat & Squid - Natural Relative Intensities

Bat & Squid - Natural Relative Intensities

Technical card

Resolution: 2203x1596

Dates:Aug. 2, 2017Aug. 20, 2017

Astrodon Tru-Balance 1.25" 3nm HA: 110x180" (gain: 200.00) -20C bin 2x2
Astrodon Tru-Balance 1.25" 3nm OIII: 223x180" (gain: 200.00) -20C bin 2x2

Integration: 16.6 hours

Darks: ~25

Flats: ~36

Avg. Moon age: 19.05 days

Avg. Moon phase: 39.09%

Bortle Dark-Sky Scale: 7.00 job: 2937474

RA center: 317.969 degrees

DEC center: 59.980 degrees

Pixel scale: 2.683 arcsec/pixel

Orientation: 89.078 degrees

Field radius: 1.014 degrees

Locations: Aurora South Backyard, Aurora, Colorado, United States

Data source: Backyard


The Bat & Squid! Once a pair of objects seldom imaged together due to the extremely faint nature of Squid Nebula, also denoted OU4, an ultra-faint and unusual OIII planetary nebula, modern technology has made this interesting set of objects more common.

Rather than reproduce what so many have before, by over-stretching Squid nebula to make it more visible, I have instead attempted to depict the two objects with natural relative intensity levels. The Squid nebula is very faint and tenuous against the background of the Cosmic Bat, mostly a translucent husk with slightly more visible boundaries, than the oft-depicted brilliantly glowing neon blue tube.

This image employs light noise reduction in an attempt to preserve the fine structures of the Squid, which are quite sharp and filamentary in certain places against the deeper red backdrop of the Bat.

Combination of 5.5 hours of Ha and 11 hours of OIII from 2017, this is another reprocess of older data.



Jon Rista
License: None (All rights reserved)

Sky plot

Sky plot


Bat & Squid - Natural Relative Intensities, 


            Jon Rista