2013/02/11 - I improved the collimation of the RC. Still seeking for optimum parameters for CCDAutoPilot, FocusMax and Autoslew, but I'm getting in the right direction. This data is shot during two separate nights.
The Rosette Nebula (also known as Caldwell 49) is a large, circular H II region located near one end of a giant molecular cloud in the Monoceros region of the Milky Way Galaxy. The open cluster NGC 2244 (Caldwell 50) is closely associated with the nebulosity, the stars of the cluster having been formed from the nebula's matter.
The complex has the following NGC designations:
NGC 2237 – Part of the nebulous region (Also used to denote whole nebula)
NGC 2238 – Part of the nebulous region
NGC 2239 – Part of the nebulous region (Discovered by John Herschel)
NGC 2244 – The open cluster within the nebula (Discovered by John Flamsteed in 1690)
NGC 2246 – Part of the nebulous region
The cluster and nebula lie at a distance of some 5,200 light-years from Earth (although estimates of the distance vary considerably, down to 4,900 light-years.) and measure roughly 130 light years in diameter. The radiation from the young stars excite the atoms in the nebula, causing them to emit radiation themselves producing the emission nebula we see. The mass of the nebula is estimated to be around 10,000 solar masses.
It is believed that stellar winds from a group of O and B stars are exerting pressure on interstellar clouds to cause compression, followed by star formation in the nebula. This star formation is currently still ongoing.
NGC2244 Rosette Nebula
1.3º x 1.3º
Field of view
44' 20.4" x 33' 11.3"
19.76 magnitude/square arcsecond
4 hours, 30 minutes total exposure time
6x 900 sec. hydrogen-alpha unbinned
6x 900 sec. oxygen-III unbinned
6x 900 sec. sulfur-II unbinned
Image acquisition with CCDAutoPilot Pro and Maxim DL Pro
Auto-guiding with Maxim DL
Auto-focusing with FocusMax
Bap pixel map
No flat frames
PixInsight for calibration (bias frames, bad pixel map and flat frames), alignment and integration.
Adobe Photoshop CS6 for final touch.