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Contains:  IC 444, IC 443, The star Propus (ηGem)
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The Jellyfish Nebula, IC 443, Hubble Palette (APOD 2017 January 7)

Technical card

Resolution: 3000x2400

Dates:Dec. 26, 2016Dec. 27, 2016

Astrodon 3nm OIII: 14x900" bin 2x2
Astrodon 3nm SII: 14x900" bin 2x2
Astrodon H-alpha 3 nm: 30x900" bin 1x1

Integration: 14.5 hours

Avg. Moon age: 27.44 days

Avg. Moon phase: 5.09% job: 1402147

RA center: 6h 17' 58"

DEC center: +22° 58' 40"

Pixel scale: 2.468 arcsec/pixel

Orientation: -90.550 degrees

Field radius: 1.317

Locations: My Back Deck, Glen Ellyn, Illinois, United States


OK, I just could not resist. This is the APOD for 2017 January 7. It's a redo of my earlier post, cropped to highlight the nebula. Here is how they described the object.

Explanation: Normally faint and elusive, the Jellyfish Nebula is caught in this alluring telescopic mosaic. The scene is anchored below by bright star Eta Geminorum, at the foot of the celestial twin, while the Jellyfish Nebula is the brighter arcing ridge of emission with tentacles dangling below and left of center. In fact, the cosmic jellyfish is part of bubble-shaped supernova remnant IC 443, the expanding debris cloud from a massive star that exploded. Light from the explosion first reached planet Earth over 30,000 years ago. Like its cousin in astrophysical waters the Crab Nebula supernova remnant, the Jellyfish Nebula is known to harbor a neutron star, the remnant of the collapsed stellar core. An emission nebula cataloged as Sharpless 249 fills the field at the upper right. The Jellyfish Nebula is about 5,000 light-years away. At that distance, this narrowband composite image presented in the Hubble Palette would be about 300 light-years across.



Eric Coles (coles44)

Sky plot

Sky plot


The Jellyfish Nebula, IC 443, Hubble Palette (APOD 2017 January 7), 


            Eric Coles (coles44)

In these public groups

Narrowband imaging