Rosette Nebula (Caldwell 49)

In the freezing cold I imaged the C49 Rosette Nebula with my usual equipment:  Canon 1100D mod, 23x135sec, ISO 1600, Canon 200mm f/2.8 @ f/3.5, HEQ5, from Dângău Mare. I can say the session was a success. I used my star handling program to reduce the stars’ dominance over the nebulae.

The curious thing in the frame is the crown shaped denser star field at 6h39′, N2°3′ in the upper left corner. It lies near the open cluster NGC 2262, at 11.3m which is just outside of this frame. I included some Google Sky and SIMBAD images for comparison, and also did an astrometry.net plate solving. With some help from a fellow amateur astronomer, known as nr74 (Németh Róbert), I identified it as Collinder 110, at 10.5m. Noteworthy that the cluster is not listed in other obvious places. See [simbad]

In this frame, open cluster NGC2236, at 8.5m is on old friend, known from the previous attempt to image the Rosette Nebula. It is about 9600 light years away, ie about twenty times further than the Pleiades.

(tovább…)

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