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@tg8arc.mastodon.social.ap.brid.gy Oct 4, 2026, 12:21 PM

Back to the s59 - last night’s observation of #C9 / #Sh2-155 #TheCaveNebula. #seestar #S50 #space #astronomy #amateur

C9 / Sh 2-155 The Cave Nebula - telescope processed image. Its popular nickname stems from a curved, dark dust lane rimming glowing emission gas, creating the visual impression of looking into a deep, shadowy cave mouth.

C9 / Sh 2-155 The Cave Nebula - unprocessed image. The illuminated edge of the "cave" is an active ionization front where intense UV radiation from hot O-type stars strikes the dense molecular cloud Cepheus B.

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