Hemisphere:  Northern  ·  Constellation: Gemini (Gem)  ·  Contains:  10 Gem  ·  11 Gem  ·  12 Gem  ·  13 mu. Gem  ·  7 eta Gem  ·  Gem A  ·  IC 443  ·  IC 444  ·  IC443  ·  IC444  ·  Part of the constellation Gemini (Gem)  ·  Sh2-248  ·  Sh2-249  ·  Tejat Posterior  ·  Tejat Prior  ·  The star Propus (ηGem)  ·  The star μGem
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SH2-248 (Jellyfish Nebula) and SH2-249, 



    
        

            Charles Bonafilia
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SH2-248 (Jellyfish Nebula) and SH2-249

Getting plate-solving status, please wait...
SH2-248 (Jellyfish Nebula) and SH2-249, 



    
        

            Charles Bonafilia
Powered byPixInsight

SH2-248 (Jellyfish Nebula) and SH2-249

Imaging telescopes or lenses: SkyWatcher Esprit 120 APO

Imaging cameras: ZWO ASI6200MM Pro

Mounts: Skywatcher EQ6R Pro

Guiding telescopes or lenses: SkyWatcher Esprit 120 APO

Guiding cameras: ZWO ASI174MM ASI174mm

Software: PixInsight

Filters: Chroma SII 3nm  ·  Chroma Ha 3nm  ·  Chroma OIII 3nm

Accessory: ZWO EFW 7x2"  ·  ASIair Pro


Dates:Jan. 8, 2021Jan. 9, 2021Jan. 10, 2021Jan. 11, 2021Jan. 12, 2021Jan. 13, 2021Jan. 14, 2021Jan. 15, 2021Jan. 16, 2021Jan. 17, 2021Jan. 18, 2021

Frames:
Chroma Ha 3nm: 146x600" (24h 20') (gain: 100.00) -20C bin 1x1
Chroma OIII 3nm: 101x600" (16h 50') (gain: 100.00) -20C bin 1x1
Chroma SII 3nm: 90x600" (15h) (gain: 100.00) -20C bin 1x1

Integration: 56h 10'

Avg. Moon age: 13.63 days

Avg. Moon phase: 11.48%

Bortle Dark-Sky Scale: 6.00


Astrometry.net job: 4179793

RA center: 6h 19' 28"

DEC center: +22° 41' 1"

Pixel scale: 1.865 arcsec/pixel

Orientation: 47.243 degrees

Field radius: 1.492 degrees


Resolution: 3600x4500

Data source: Backyard

Description

This patch of sky in the constellation of Gemini is home to several supernovae. The most alluring and studied is the Jellyfish Nebula (IC443) about 5,000 light-years away that exploded between 3,000-30,000 years ago. Its true age is unknown due to the misalignment of the pulsar that was left behind located on the left outer ridge (middle-left) of the nebula. It’s anchored top and bottom by two bright stars, Mu (top) and Eta Geminorum (bottom) at the foot of Castor, one of the twins.

The Jellyfish Nebula itself is pictured at the bottom right and located in the galactic anticenter direction (l=189.1°), close to the galactic plane (b=+3.0°), with

the brighter arcing ridge of emission colliding with the less dense hydrogen region above it and the dangling tentacles being blown apart by the surrounding

gamma radiation. An emission nebula cataloged as SH2-249 (IC-444) fills the field of view in the middle and top of the image.

This image was constructed using narrowband image data, with emissions from sulfur, hydrogen and oxygen atoms shown in red, green and blues hues.

Shot from my backyard in San Diego.

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SH2-248 (Jellyfish Nebula) and SH2-249, 



    
        

            Charles Bonafilia