IC-1795 (Fishhead Nebula) in SHO (Joel Shepherd)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: HD14552 · HD15069 · IC 1795 · LBN 645 · LBN 646 · LBN 647 · LBN 648 · LDN 1359 · NGC 896

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IC-1795 (Fishhead Nebula) in SHO

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IC-1795 (Fishhead Nebula) in SHO

IC-1795, a.k.a. the Fishhead Nebula, just to the side of the Heart Nebula, with about 17 hours of narrowband exposures and 4 hours of RGB for the stars, taken in November 2022. This was one of the more satisfying targets I've captured: processing was really easy, colors didn't need a lot of massaging, and the dust just speaks for itself.

Lately I've been thinking that nebula morphology must be an area of study, or if not it should be. For instance, why are so many emission nebula oxygen-dense in the inner regions with hydrogen and sulfur prominent further out? Do you ever look at the shapes and shading of clouds and see patterns that remind you of nebula? Is there a clue there about how nebula are formed, kind of how J. Harlen Bretz recognized the patterns of running water at a great scale in eastern Washington and Oregon, leading to the theory of the Missoula floods? Anyway ... some very hot stars emitting a lot of ultraviolet radiation lend a lot of the color to this image.

The refractors!
N.I.N.A. Users
TEC140 Refractor
Narrowband imaging

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Status	Advanced success
Started	...
Astrometry.net job	7728675
PixInsight job	72KJHL5IAIPLV5W9G1SE7UKBSH2RAAF5
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	02h26m51s.43
RA (top/left)	02h30m17s.41
RA (top/right)	02h23m25s.32
RA (bottom/right)	02h23m29s.61
RA (bottom/left)	02h30m13s.24

Dec (center)	+62°00′20″.3
Dec (top/left)	+62°19′26″.5
Dec (top/right)	+62°19′26″.5
Dec (bottom/right)	+61°40′54″.7
Dec (bottom/left)	+61°40′55″.1

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IC-1795 (Fishhead Nebula) in SHO

IC-1795 (Fishhead Nebula) in SHO

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IC-1795 (Fishhead Nebula) in SHO

IC-1795 (Fishhead Nebula) in SHO

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