Messier 46, NGC 2438 in Puppis

© Velimir Popov & Emil Ivanov 2016
Size: 1800 px


Messier 46 (also catalogued as NGC 2437) is an open cluster in the constellation of Puppis. This is is very rich cluster, with its 150 stars of mag. between 10 and 13. The brightest of these stars are of spectral type A0, and each is about 100 times more luminous than the Sun. The age of M 46 is estimated to be about 300 million years. The stars of the cluster are scattered over about 27', which corresponds to a linear extension of 30 light years at the cluster's distance of 5,400 light years. A special feature in this cluster is the planetary nebula NGC 2438 (also catalogued PK 231+04.2) which appears within the borders of M46. However, this nebula is most probably not a member of the cluster. Wider field of view, taken with the 12" ASA Astrograph could be found here. A highly magnified crop of NGC 2438 can be seen below:



Image details:


Center of field RA 07:41:38 (h:m:s)
Center of field DE -14:47:37 (deg:m:s)
Size 31.3 x 31.3 (arcmin)
Pixel scale: 1.04 (arcsec/pixel)
Orientation: Up is 179 degrees E of N
Charts and image details obtained from
Optic(s): RC 12" with Astro-Physics corrector @ f/5 (RC)
Mount: ASA DDM85 Premium
Camera: ATIK 4000 M
Filters: Astronomik HaLRGB filter set
Dates/Times: 13.11.2012
Location: IRIDA Observatory, BG, longitude: E 24 44' 18", latitude: N 41 41' 42"
Exp. Details: L:3x10 min, R:3x10 min, G:3x10 min, B:3x10 min,
  Bin 1, Total Exposure Time - 120 min (2:00 hrs)
More details: Dark and flat frames reduction
Processing: PixInsight / PS
Copyright: Velimir Popov and Emil Ivanov 2016. All Rights Reserved
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