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Messier 46 in Puppis

Astrophotography from Ursa Major Observatory @ ROSA

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Open star cluster (II2r)
27’
6.1 mag
Pup
2017-11-18+19
Astro-Physics 175mm f/8 Starfire EDF with field flattener (f=1452mm)
10micron GM3000 HPS
L 14x2 min, RGB 7x2 min each
1h 10min
Camera:
Moravian G4-16000 with Baader filters
Image acquisition by CEDIC team (Bernhard Hubl, Christoph Kaltseis, Markus Blauensteiner) Image processing by Bernhard Hubl
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5 000 Ly
Messier 46 is a rich star cluster in the constellation Puppis. There are an estimated 500 stars in the cluster, and it is thought to be some 300 million years old. As a special and famous feature which is also obvious in the above image, a planetary nebula (NGC 2438) appears within the apparent borders of M46. This nebula is most probably not a true member but is superimposed, or perhaps a passing guest. To the north of NGC 2438 another small and faint planetary nebula (M 1-18) is visible in the above image.