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NGC 2244


NGC 2244 in Monoceros

RA = 6 hrs 31 min; Dec = +4 deg 56 min

Date & Site:

Completed on 12/22/13; Runningman Observatory, Carlsbad, CA

Clear; very good seeing;very good transparency

Temperatures in low 50s


Telescope: AT8RC (1625 mm fl f/8)

Mount: Losmandy G-11 with Gemini
Camera: ST-10XME; CFW10 with 3 nm Astrodon filters;

Hutech Off-Axis Guider (OAG5)


Exposures: 3 hrs of Ha; 2 hrs each OIII and SII (15 min subexposures) for a total of 7 hrs over two nights.

Color mapped using the Hubble Palette assigning Ha to Green; OIII to blue and SII to Red

FOV =32 x 21.5 arc minutes

This cluster resides in the center of the Rosette Nebula and includes several hot young O-type stars that generate large amounts of radiation and stellar wind. The powerful stellar winds appear to blow a hole through the dense cloud of the surrounding Rosette Nebula leaving a portal to the "other side". The stars in this cluster were formed from the surrounding gas nebula about 5 million years ago. The two brightest stars of the cluster are 400,000 times brighter than the Sun.

The nebula surrounding the cluster is dominated by ionized oxygen and hydrogen emitting the teal color.

This "close-up" image of the center of the Rosette Nebula show several Bok Globules, dark clouds of dense dust and gas in which stars begin to form.

5200 light years away

Reduced from original

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