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Auriga Shell near Sh2-216, David Elmore

Auriga Shell near Sh2-216

Getting plate-solving status, please wait...
Auriga Shell near Sh2-216, David Elmore

Auriga Shell near Sh2-216

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Description

What is this circular feature in Auriga that shows up well in H-alpha?  Image is HOO with SII added as yellow.
Starless to bring out nebulosity.  Blur, Noise, and Star XTerminator from Russell Corman.
Recorded over four nights after moon set.

Comments

Histogram

Auriga Shell near Sh2-216, David Elmore