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Contains:  IC 444, IC 443, The star Propus (ηGem)
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Jellyfish from the City (Mostly) IC443, 


            Kevin Morefield
Jellyfish from the City (Mostly) IC443

Jellyfish from the City (Mostly) IC443

Technical card

Resolution: 3336x2265

Dates:March 3, 2017Jan. 15, 2019Jan. 16, 2019March 4, 2019

Astrodon Ha 5 nm: 14x1200" -15C
Astrodon Ha 5 nm: 6x1800" -25C bin 1x1
Astrodon Ha 5 nm: 12x1200" -30C bin 1x1
Astrodon OIII 3 nm: 4x1200"
Astrodon OIII 3 nm: 16x1200" -15C bin 1x1
Astrodon SII 3 nm: 14x1200" -15C bin 1x1
Astrodon SII 3 nm: 7x1200" -30C bin 1x1

Integration: 25.3 hours

Darks: ~19

Flats: ~19

Bias: ~37

Avg. Moon age: 12.74 days

Avg. Moon phase: 41.73%

Bortle Dark-Sky Scale: 5.71 job: 2566620

RA center: 94.517 degrees

DEC center: 22.759 degrees

Pixel scale: 2.099 arcsec/pixel

Orientation: 221.042 degrees

Field radius: 1.175 degrees

Locations: Sierra Remote Observatory, Auberry, California, United States; Central Portland Oregon, Portland, Oregon, United States

Data source: Mix of multiple source


My intent was to capture this as a mosaic with my CDK14 at SRO, but there have been maybe 10 hours this year that I could shoot from SRO due to incredibly bad weather. So with 4 clear days in Portland Oregon, I trotted the FSQ106 and my STT8300 out to my city backyard to get this last narrowband object of the season.

The image contains 14.66 hours of FSQ106/STT8300 data from Portland + 3 hours I found from my old Los Angeles backyard. I had 7.66 hours of data on just the central section taken with the CDK14 and STX16803 from SRO.

Though there were 4 different camera orientations and 2 vastly different image scales, CCDStack was able to register and integrate all of the data.

The mix here is Ha for luminance, SII for Red, SII+10%Ha+OIII for Green, and OIII for Blue. As is typical of SNR's, there is a bright OIII shell just outside the main shock front. To preserve that, I added OIII back as a brighten layer much like we add Ha to galaxies. The blue/cyan gasses on the right are blue because there is some OIII reflection there and there is no SII to color the area. In truth that would be red from Ha but then almost the whole thing would be red in broadband.



Kevin Morefield
License: None (All rights reserved)

Sky plot

Sky plot


Jellyfish from the City (Mostly) IC443, 


            Kevin Morefield