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
• 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.