Hemisphere:  Northern  ·  Constellation: Gemini (Gem)  ·  Contains:  12 Gem  ·  7 eta Gem  ·  Gem A  ·  IC 443  ·  IC443  ·  Sh2-248  ·  Tejat Prior  ·  The star Propus (ηGem)
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IC443 The jellyfish nebula, 


            Roy Hagen
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IC443 The jellyfish nebula

Imaging telescopes or lenses: William Optics FLT 132 Triplet APO

Imaging cameras: ZWO ASI 071MC PRO Cool

Mounts: iOptron CEM60  ·  Ioptron Tri Pier

Guiding telescopes or lenses: William Optics Z61 MKII

Guiding cameras: ZWO ASI224MC

Focal reducers: William Optics Flattener 7 Apo 0,8

Software: Pleiades Astrophoto PixInisight  ·  ZWO Asiair Asiair App iPad

Filters: Radian Telescopes 2" Triad Ultra Quad-Band

Accessory: ZWO EAF Electronic Auto Focuser  ·  Starizona Filter Slider  ·  ZWO ASIAIR  ·  Astro Zap Dew heater 2"  ·  Astro Zap Dew heater 5" Dew heater  ·  Pegausus PPB Pocket Power Box

Dates:Feb. 9, 2021Feb. 10, 2021Feb. 11, 2021Feb. 12, 2021Feb. 13, 2021

Frames:Radian Telescopes 2" Triad Ultra Quad-Band: 435x180" (gain: 45.00) -20C bin 1x1

Integration: 21.8 hours

Darks: ~60

Flats: ~100

Bias: ~100

Avg. Moon age: 17.41 days

Avg. Moon phase: 2.35%

Bortle Dark-Sky Scale: 6.00

Astrometry.net job: 4415703

RA center: 6h 17' 14"

DEC center: +22° 36' 40"

Pixel scale: 1.353 arcsec/pixel

Orientation: -11.514 degrees

Field radius: 1.091 degrees

Resolution: 4828x3220

Locations: Frontyard, Geithus, Buskerud, Norway

Data source: Backyard


The nebula is a supernova remnant in the constellation Gemini, The Twins, in a distance of more or less than 5000 lightyears from my front porch.
The brightest star in the image is Propus, Eta Geminorum, which is a red giant of magnitude 3,25

I have had the pleasure of a cold and clear sky for three weeks now, with temperatures down to -19°C at night. Well….. it`s actually not a pleasure to get up from bed at 6 in the morning and stick the nose beyond the outdoor for driving to work.
But the telescope, mount, cameras and the electronic devices worked very fine in these temperatures.
Earlier this year I found a couple of tadpoles in the constellation Auriga, The charioteer.
This time I set out to catch a Jellyfish in the constellation Gemini.
I remember a yellow jellyfish from a thousand years ago when I was young boy, swimming in the cold arctic sea (in summer of course), as “a close encounter of the painful kind”.
Boys do not plan very well before doing stupid things, but when one gets older it is easier to laugh of such things.



  • IC443 The jellyfish nebula, 


            Roy Hagen
  • Final
    IC443 The jellyfish nebula, 


            Roy Hagen

Sky plot

Sky plot


IC443 The jellyfish nebula, 


            Roy Hagen