Hemisphere:  Northern  ·  Constellation: Gemini (Gem)  ·  Contains:  IC 443  ·  The star Propus (ηGem)
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Jellyfish Nebula IC443, 



    
        

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Jellyfish Nebula IC443
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Jellyfish Nebula IC443

Getting plate-solving status, please wait...
Jellyfish Nebula IC443, 



    
        

            hy
Jellyfish Nebula IC443
Powered byPixInsight

Jellyfish Nebula IC443

Technical card

Imaging telescopes or lenses: Williams Optics Zenithstar 105 ED Triplet APO

Imaging cameras: ZWO ASI1600mm Pro Cooled

Mounts: Orion Atlas AZ/EQ Pro

Guiding telescopes or lenses: Williams Optics Zenithstar 105 ED Triplet APO

Guiding cameras: QHY5L-II-M

Focal reducers: William Optics 0.8x Reducer/Flattener Flat6A II

Software: Adobe Phosotshop CC  ·  KStars Ekos/INDI, Stellarmate OS  ·  Adobe Lighroom CC Classic  ·  PixInsight 1.8

Filters: Astronomik Ha 31mm 6nm  ·  Astronomik Blue 31mm  ·  Astronomik Green 31mm  ·  Astronomik Red 31mm


Dates:Feb. 24, 2020

Frames:
Astronomik Blue 31mm: 44x240" (2h 56') (gain: 75.00) -20C bin 1x1
Astronomik Green 31mm: 33x240" (2h 12') (gain: 75.00) -20C bin 1x1
Astronomik Ha 31mm 6nm: 28x480" (3h 44') (gain: 139.00) -20C bin 1x1
Astronomik Red 31mm: 40x240" (2h 40') (gain: 75.00) -20C bin 1x1

Integration: 11h 32'

Darks: ~25

Flats: ~25

Bias: ~100

Avg. Moon age: 0.78 days

Avg. Moon phase: 0.68%

Bortle Dark-Sky Scale: 5.00


Basic astrometry details

Astrometry.net job: 3296036

RA center: 6h 17' 21"

DEC center: +22° 33' 54"

Pixel scale: 1.325 arcsec/pixel

Orientation: 188.506 degrees

Field radius: 0.870 degrees


Resolution: 3781x2836

Data source: Backyard

Description

Here's an image of the Jellyfish Nebula (IC 443) taken Feb 24-26.

It's HaRGB with (after blinking) Blue [email protected]=2.9h, Green [email protected]=2.2h, Red [email protected]=2.7h & Ha [email protected]=3.7h. Total 11.5 hours of exposure from my house in Ladera (f/5.6105mm WO refractor, ZWO ASI1600mm pro camera @-20C, Atlas Pro mount).

Combination of PixInsight for the basic RGB and Ha processing, then layers in Photoshop to combine the RGB and HA and various contrast adjustments. I merged in a 2nd less-stretched and somewhat desaturated RGB image at the position of Propus, the bright star (Mag 3.3) to the left of the nebula.

The nebula, a supernova remnant, has a nice write-up at https://www.nasa.gov/mission_pages/chandra/what-spawned-the-jellyfish-nebula.html

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Revisions

  • Jellyfish Nebula IC443, 



    
        

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    Original
  • Final
    Jellyfish Nebula IC443, 



    
        

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    B

B

Description: Added deconvolution, and modified the Ha mixing to produce less background red.

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Sky plot

Sky plot

Histogram

Jellyfish Nebula IC443, 



    
        

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