The Star Cluster Stock 23 (Pazmino's Cluster) and Sh2-202

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Location / Date

Zellerndorf, Sept - Oct 2016

Telescope / Mount / Guiding

ASA 10" Astrograph, ASA 3" Wynne-Corrector (focal length 910mm)
ASA DDM60, no guiding

Camera / Exposure

FLI ML8300 for Luminance and Halpha
Canon 500D for Color

3 x 3 panel mosaic:
LUM 286 x 3min
Color 139 x 10min
Hα 163 x 10min

Total exposure time: 64h 38min


PixInsight, Fitswork, Photoshop


The open star cluster Stock 23 in the constellation Camelopardalis was discovered in the second half of the 1950s by the German astronomer Jürgen Stock. This cluster has been more or less "anonymous" until John Pazmino wrote about it in the in the March 1978 issue of «Sky & Telescope». Since then it is sometimes called Pazmino's cluster. Together with some dark nebulae this cluster is embedded in the faint and huge emission nebula Sh2-202.

The reflection nebulae vdB 14 (LBN 681) and vdB 15 (LBN 682) are illuminated by two supergigant stars which lies in the middle of the much bigger star forming region Cam OB 1. The reflection nebula vdB 15 has also a red emission component, this results in a more pinkish color.

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