NGC 7129 & NGC 7142

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The starless Halpha-image:

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Location / Date

Zellerndorf, August - September 2018

Telescope / Mount / Guiding

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

Camera / Exposure

Moravian G3-16200, Astrodon filters

2-panel mosaic:

L         67 x 10min, 63 x 10min
R         2 x (18 x 10min)
G        2 x (18 x 10min)
B        2 x (18 x 10min)
Hα       64 x 20min, 62 x 20min

Total exposure time: 81h 40min


PixInsight, Fitswork, Photoshop


NGC 7129 is an young open star cluster, embedded in the reflection nebula vdB 146, located in the constellation Cepheus. The young stars are responsible for illuminating the surrounding nebula.
The young stars have blown a large, oddly shaped bubble in the molecular cloud that once surrounded them at their birth. The rosy pink color comes from glowing dust grains on the surface of the bubble being heated by the intense light from the young stars within.
Other markers of energetic, young stellar objects are the so called Herbig-Haro objects (HH). Their shape and color is characteristic of glowing hydrogen gas shocked by jets streaming away from newborn stars.

NGC 7142 is an open cluster about 6,200 light-years away. With an estimated age of 4.5 billion years, he is one of the oldest known open clusters.

The fine Halpha filaments on the left side are part of the supernova remnant SNR 110.3 + 11.3.

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