Messier 46 in Puppis
Exposure time total:
Open star cluster (II2r)
Astro-Physics 175mm f/8 Starfire EDF with field flattener (f=1452mm)
10micron GM3000 HPS
L 14x2 min, RGB 7x2 min each
Moravian G4-16000 with Baader filters
Image acquisition by CEDIC team
(Bernhard Hubl, Christoph Kaltseis, Markus Blauensteiner)
Image processing by Bernhard Hubl
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.