Rice Hat Nebula - Supernova Remnant in Auriga - SH2-224 LBN 769 (Albert Christensen)

Celestial hemisphere: Northern · Constellation: Auriga (Aur)

Rice Hat Nebula - Supernova Remnant in Auriga - SH2-224 LBN 769, Albert Christensen

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Rice Hat Nebula - Supernova Remnant in Auriga - SH2-224 LBN 769

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Rice Hat Nebula - Supernova Remnant in Auriga - SH2-224 LBN 769

Sharpless 2-224 in Auriga (Supernova remnant SNR G166.0+04.3) - Underestimated the difficulty in this one. Definitely a candidate for redo. Had average transparency and seeing with heavy dew and the moon, along with neighborhood lights, poor tracking and all the usual suspects for excuses. Will sneak up on it again when conditions and planning are better!

Sh2-224 is a large, complex and old supernova remnant comprised of sharp and diffuse filaments. The brightest optical section is generally spherical with an apparent diameter of 30 arc-minutes and is accompanied by a wing to the west comprised of extended diffuse nebulosity which runs north-south and is approximately 70' by 75' in apparent diameter. The current morphology of Sh2-224 is quite peculiar and the general consensus is that the large spherical SNR visible in the image below incurred an eruption to the southwest wall, thus leading to further expansion into this interstellar cavity and which has yielded the current extended nebulosity running north-south (studies have found this section to be less dense but with greater temperature than the core to the east). An age of approximately 60,000 years old for the SNR itself, thereby making it one of the oldest supernova remnants known. Investigations of the central section of the SNR, have been unsuccessful in identifying the remnant star brighter than mag 22.
(Internet Sharpless Catalog Nebula Image Gallery)

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Rice Hat Nebula - Supernova Remnant in Auriga - SH2-224 LBN 769

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