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NGC 2244 in the Rosette nebulae
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NGC 2244
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NGC 2244 in the Rosette nebulae
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| Open cluster NGC 2244 was discovered by Flamsteed about 1690.
The nebula, however, was not even seen by William Herschel (who found the cluster); its different parts were discovered only by John Herschel (NGC 2239 = GC 1420 = h 392), Marth (NGC 2238 = GC 5361 = Marth 99), and Swift (NGCs 2237 and 2246). The Rosetta Nebula is a vast cloud of dust and gas, extending over an area of more than 1 degree across, or about 5 times the area covered by the full moon. Its parts have been assigned different NGC numbers: 2237, 2238, 2239, and 2246. Within the nebula, open star cluster NGC 2244 is composed of young stars which recently formed from the nebula's material, and the brightest of which make the nebula shine by exciting its atoms to emit radiation. Star formation is still in progress in this vast cloud of interstellar matter; a recent finding of a very young star with a Herbig-Haro type jet by astronomers at the NOAO has been announced on January 22, 2004. More informations are available at the seds.org website |
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| Optics |
130 mm f/6.7 Astro-Physics EDF Refractor with AP field flattener |
| Mount |
Astro-Physics AP 1200QMD + Astro-electronic FS2 goto |
| Camera | SBIG ST-10XE. |
| Filters | SBIG CFW8A.With Astrodon LRGB Ha filters |
| Focuser | Robofocus focuser and Focusmax software |
| Dates | 23 & 24 January 2006. |
| Location | Lentin Observatory |
| Exposure | Ha,R,G,B =
180:45:45:45 minutes. Ha bin1; RGB bin2; -25°c. Scale 1.61^s/pixel |
| Acquisition | MaxIm DL 4, TheSky 6, |
| Processing | MaxIm DL 4, Photoshop CS, Registar, Neat Image. |
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Antoine Vergara