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Rosette Nebula (Ha:sG:OIII)

19:11 22/12/2006 UTC

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I've always liked the appearance of narrowband images. I don't own SII (yet) so I decided to try to make synthetic green channel like in Steve Cannistra's bi-color technique. I don't have the tools he is using and I had to try to do something similar in IRIS. The Green channel is simply created by multiplying the Ha and OIII channels together using PROD command. Too bad the weather wasn't co-operating and I left with a bit noisy data. It was also very windy.

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

rosette-2006.12.22-19h11m.jpg

[High Resolution : 1280x960 388kB]

Camera: Modified Canon EOS 350D (Rebel XT) | 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: 6x480s (48m) ISO800 f6 (Ha), 5x480s (40m) ISO800 f6 (OIII), 4 darks, 12/17 flats, bias. Ha:sG:OIII Mapping | Software: IRIS, GIMP | Location: 60°31'N 26°52'E (Koivula/Kotka,FI) | Target altitude in the beginning of the exposure 22°

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Added: 23:22 22/12/2006 UTC