M46 open cluster in Puppis

M46 is a rich open cluster, easily visible with binoculars, that is located in the rich Milky Way star fields of the constellation of Puppis. The cluster is a relatively large object with an apparent diameter almost equal to that of the full Moon. Charles Messier discovered M46 in 1771.

M46 is 5400 light-years distant, with the non related planetary nebula closer at 3000 light-years.
Find a close-up on the planetary nebula NGC2438 here.

Image data:
Ha-O3-LRGB (Ha 4x40m, OIII 4x40m, L 6x10m, R 7x100s, G 7x100s, B 7x100s),  seeing 0.7 arcsec

80cm f/7 Astrooptik Keller corrected cassegrain, FLI Proline 16803, Baader Filters, Prompt 7 CTIO Chile,

Acquisition: Philipp Keller, Processing: Johannes Schedler


Last modified on Tuesday, 28 January 2014 21:39

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