NGC 2438 PN in Puppis
This planetary nebula apparently is embedded in the open Cluster M46. However is is not physically related to the cluster but 1500 light years closer. A faint outer shell is visible in the image below.
Checkout a miniature PN (rotten egg nebula) at 4 h near the corner;
Find a wider view including M46 at the star clusters page
Ha-O3-LRGB (Ha 4x40m, OIII 4x40m, L 6x10m, R 7x100s, G 7x100s, B 7x100s), NB for visualizing the outer shell,
seeing 0.7-1 arc-sec,
80cm f/7 Astrooptik Keller corrected cassegrain, FLI Proline 16803, Baader Filters, Prompt 7 CTIO Chile,
Acquisition: Philipp Keller, Processing: Johannes Schedler