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Sharpless 2-157, Messier 52, The Bubble Nebula, et al.

Several open clusters and emission nebula are framed in this wide field view at the border of the constellations Cepheus and Cassiopeia.  This image was taken with a hydrogen-alpha emission line filter.

The large flower shaped emission nebula is Sharpless 2-157.  Other emission nebula captured in this frame are NGC 7538, the Bubble Nebula, Sharpless 2-159 and Sharpless 2-156.  Messier 52 is the most prominent open cluster in the frame but NGC 7510, C 2306+602/King 19 and Markarian 50 are also easily identifiable.  All of the aforementioned objects are identified in the annotated image below.  Click on the image for a larger version.

The equipment and exposure details are as follows:

Acquisition Date:  September 6, 2019
Location: Tierra del Sol, San Diego County, California
• Imaging Scope – Takahashi FSQ-106 EDX IV with Takahashi 0.6x reducer
• Imaging Camera – ZWO ASI1600MM-C with EFW2
• Filters – Baader 36mm hydrogen-alpha 7nm emission line filter
• Guiding – Borg 77ED with ZWO ASI120MM-S
• Mount – Astro-Physics 900GTO
Camera Control – Sequence Generator Pro
Guider control – PHD2
Acquisition Details:
• Imaging Camera – gain 200, offset 50 – cooled to -15
• Exposures – 65 x 270 sec.
PixInsight and Photoshop CC were used to process the images.
• PixInsight –
⁃ Image calibration, alignment, integration (using Local Normalization tool)
⁃ MultiscaleLinearTransform for noise attenuation
⁃ HistogramTransformation for histogram adjustment
• Photoshop –
⁃ additional adjustments to histogram

Click on the image below to see a larger version.

Posted in Bright Nebula, CMOS Camera Image, Star Clusters

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