Sh2-188 in RGB

Sharpless2-188, a difficult target already for narrowband imaging. This version, however, is RGB with Ha mixed into the luminance channel. This object is an unconventional planetary nebula located in the constellation Cassiopeia. The expanding gas from the planetary nebula is colliding with ambient gas in the interstellar medium. The nebula is brighter to the southeast (upper right) because the central star is moving rapidly in that direction. Faint wisps of gas can also be seen in the opposite direction.

This is an RGB composite using 12 hours of data with additional 6 hours of Ha data, mixed into a synthetic luminance channel, taken with the Astro-Physics Riccardi-Honders 305mm Astrograph at the Deep Sky West Observatory.

Exposure: Ha 15 x 1200sec, RGB (48,48,47) x 300sec Date: 2017-11-14…2017-11-19
Setup: Astro-Physics RH-305 with FLI ML8300 Site: Deep Sky West Observatory, NM, USA


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