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
Total Exposure: 9 minutesMessier 46
(also known as M 46
or NGC 2437
) is an open cluster
in the constellation
. 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)