Uploaded 3-Apr-11
Taken 23-Sep-12
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Photo Info

Dimensions1800 x 1192
Original file size1.15 MB
Image typeJPEG
Color spacesRGB
Date modified23-Sep-12 15:06
M46 & NGC 2438

M46 & NGC 2438

Windy, unsettled conditions.
Canon 7D, C11 + 6.3, EQ6 EQMOD, guided with 9x50 Finder Scope, DSI Pro 2
9 x 60 seconds @ 1600 ISO
No Dark frames
20 Flats
50 Bias
Total Exposure: 9 minutes

Messier 46 (also known as M 46 or NGC 2437) is an open cluster in the constellation of Puppis. It was discovered by Charles Messier in 1771. Dreyer described it as "very bright, very rich, very large." M46 is about 5,500 light-years away with an estimated age on the order of several 100 million years.
The planetary nebula NGC 2438 appears to lie within the cluster near its northern edge (the faint smudge at the top center of the image), but it is most likely unrelated since it does not share the cluster's radial velocity. The case is yet another example of a superposed pair, joining the famed case of NGC 2818.
M46 is about a degree east of M47 in the sky, so the two fit well in a binocular or wide-angle telescope field. (from Wikipedia)