C49 Rosette Nebula (Joe Niemeyer)

Celestial hemisphere: Northern · Constellation: Monoceros (Mon) · Contains: NGC 2237 · NGC 2238 · NGC 2239 · NGC 2246 · Rosette A · Rosette B · Rosette Nebula · The star 12Mon

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C49 Rosette Nebula

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C49 Rosette Nebula

Here is my image of the beautiful Rosette Nebula (Caldwell 49) containing the open star cluster NGC 2244 whose stars were formed by the nebula's gasses. More stars are being formed in this nebula all the time. It lies 5,000 light years away from Earth towards the Milky Way's core above Sirius and left of Betelgeuse. This nebula is a whopping 130 light years across and it's apparent size is three times the size of the moon. Yet it is incredibly faint at magnitude 9.0, the dimmest object I have tried to capture thus far.

I continue to learn more about autoguiding, which uses a secondary camera to lock onto stars outside the main image frame and send centering corrections to the telescope mount. And I was particularly pleased with the quality of light subframes from this imaging session due to accurate guiding. This image is a stack of 28 180-second ISO 2500 exposures at 1645mm focal length, calibrated with 10 dark frames, 20 bias frames, 20 flat frames, and then post-processed in Photoshop.

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	Image of the day	Top pick	Top pick nominations	Total submitted
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	Image of the day	Top pick	Top pick nominations	Total submitted
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Status	Basic success
Started	...
Astrometry.net job	4502304
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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C49 Rosette Nebula

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