Rosette Nebula (Ha:sG:OIII)

18:49 28/12/2006 UTC

I had to return to this. Now I have a filter drawer system, which allows me to switch filters without removing the camera. Result is more available field (camera orientation stays put) and more time to image because of no need for refocusing etc. 2h30m is almost maximum time Rosette is visible from my backyard. I am quite satisfied with the result. Time to move on to next target... Again synthetic green channel is a made from product of the Ha and OIII images.

NGC/IC Object List:
NGC2244 open cluster RA:06h31m55.5 Dec:+04°56m'35" BMag: 4.8, NGC 2239
NGC2237 gaseous nebula RA:06h30m54.6 Dec:+05°02m'52" BMag: ,
NGC2238 gaseous nebula RA:06h30m40.3 Dec:+05°00m'47" BMag: 6.0, LBN 948 Rosette Nebula
NGC2239 open cluster RA:06h31m55.5 Dec:+04°56m'35" BMag: 4.8, NGC 2244

Camera: Modified Canon EOS 350D | Telescope: Skywatcher ED80 Pro 80mm f7.5 refractor, William Optics 0.8x focal reducer | Mount: Orion Skyview Pro, Boxdoerfer PowerFlex MTS-3SLP drive controller | Filters: Astronomik H-alpha 13nm 2", Astronomik OIII 13nm 2" | Guiding: Orion ShortTube 80mm f5 refractor, QCGuider, Teleskop-Service 1.5x Barlow, Phillips ToUCam Pro II webcam | Exposure: 12x300s (60m) ISO800 f6 (Ha), 18x300s (1h30m) ISO800 f6 (OIII), 8 darks, 10 flats, bias. Ha:sG:OIII Mapping | Software: IRIS, GIMP | Location: 60°31'N 26°52'E (Koivula/Kotka,FI) | Image Field: 2.334 x 1.75 degrees | Image Center: Ra 06h31m54s Dec +04°59'48" | Target altitude in the beginning of the exposure 22°