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

Celestial hemisphere: Northern · Constellation: Gemini (Gem) · Contains: 10 Gem · 11 Gem · 12 Gem · 13 mu. Gem · 7 eta Gem · Gem A · IC 443 · IC 444 · 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

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SH2-248 (Jellyfish Nebula) and SH2-249

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.

SDAA AISIG Group

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Status	Advanced success
Started	...
Astrometry.net job	4179793
PixInsight job	QG66HHG6NJGPAC5MA3NEHFRZ5VGQYDZ5
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	06h19m28s.36
RA (top/left)	06h25m53s.65
RA (top/right)	06h20m26s.88
RA (bottom/right)	06h13m01s.14
RA (bottom/left)	06h18m31s.14

Dec (center)	+22°41′01″.6
Dec (top/left)	+22°46′56″.8
Dec (top/right)	+24°09′23″.8
Dec (bottom/right)	+22°34′25″.3
Dec (bottom/left)	+21°12′26″.4

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SH2-248 (Jellyfish Nebula) and SH2-249

SH2-248 (Jellyfish Nebula) and SH2-249

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Image Index:

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SH2-248 (Jellyfish Nebula) and SH2-249

SH2-248 (Jellyfish Nebula) and SH2-249

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