M46, M47 and ngc2423 - RGB - Open Clusters in Puppis

M46, M47 and ngc2423

M46 (lower left), M47 (lower right) and ngc2423 (faint, upper right) - Open Clusters in Puppis

Moravian G4 camera w Astrodon Gen II filters
Astro-Physics AP155EDF Refractor w Robofocus
11/11/11 x 5 min for each of RGB
Paramount MX guided w ST-402 and Borg 60mm achromat
Image acquisition via CCD-Commander and TSX

Processing in PixInsight and PS CC 2021
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Messier 46 (M46, NGC 2437) was the first object Charles Messier discovered after he had published the first edition of his list (M1-M45). He added this one to his catalog on February 19, 1771, three days after presenting it to the academy, together with three more Messier objects, M47, M48, and M49.

The cluster is very rich, with 150 stars of mag 10-13 and probably a total population of over 500. The brightest of these stars are each about 100 times more luminous than the Sun. This indicates an age of about 300 million years. The members are scattered over an angular diameter of about 27', corresponding to a linear extension of 30 light years at the cluster's distance of 5,400 light years, and are receding from us at 41.4 km/sec, according to Baade. As a special and famous feature which is also obvious in this photograph, a planetary nebula (NGC 2438, also FC 87) appears within the apparent borders of M46. This object appears to lie near the northern fringes of the cluster. However, this nebula is most probably not a true member but is superimposed, or perhaps a passing "guest".

Open cluster Messier 47 (M47, NGC 2422) is a coarse, bright cluster which can be glimpsed with the naked eye under good conditions as a dim nebulosity.

M47 was discovered before 1654 by Hodierna who described it as "a Nebulosa between the two dogs"; this fact, however, remained secret until 1984 when his book came to light. So Charles Messier discovered this cluster independently on February 19, 1771, and described it as cluster of stars brighter than those of apparently neighbored M46. Caroline Herschel observed and identified M47 at least twice in early 1783. William Herschel also independently rediscovered it on February 4, 1785. Open cluster M47 is a coarse cluster of bright stars, and contains about 50 stars in a region 12 light years in diameter.
NGC2423 is not much talked about. One can see that it is very faint.

Captured March 2021
Lucknow, Ontario