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C49 Rosette Nebula – photons from 2016-12-30

2017.01.06.
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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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Rosette Nebula (Caldwell 49), 2016-10-16 processing

2016.10.16.
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Rosette Nebula (as processed on 2016-10-16)

Rosette Nebula (as processed on 2016-10-16)

I used the old raw material as described in this post, but this time I used the new program described here. This is the result.

From wikipedia: The Rosette Nebula (NGC 2237, 2238, 2239, and 2246) is a diffuse nebula in Monoceros. It has an overall magnitude of 6.0 and is 4900 light-years from Earth. The Rosette Nebula, over 100 light-years in diameter, has an associated star cluster and possesses many Bok globules in its dark areas. It was independently discovered in the 1880s by Lewis Swift (early 1880s) and Edward Emerson Barnard (1883) as they hunted for comets.

I also looked up the small open cluster on the lower right of the frame, it is NGC 2236. It is about 9600 light years away, ie about twenty times further than the Pleiades.

Canon 1100D mod, obi de 200mm F/2.8 la F/4, 20×150 sec, ISO 800, EQ3, Dângău Mare, Cluj, 2016-04-03

(tovább…)

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