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Narrowband Cygnus

16:41 20/10/2007 UTC

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At last I got an opportunity to try narrowband filters to Cygnus nebulae. I was able to connect my filter pocket system to the front of the objective, which aids in filter changing a lot - especially in darkness. This image is from the same general area as the previous image I took and there's also OIII and SII data added. Moon and stray light caused some post processing challenges, but still I managed to pull out something. You can see familiar objects coloured in different ways in this image. Note how Butterfly Nebula emits mostly only H-alfa light. Not a very good target for tri-band narrowband imaging. Total exposure time is three hours.

NGC/IC Object List:
NGC7000 gaseous nebula RA:20h58m50.0 Dec:+44°31m'00" BMag: 4.0, LBN 373 North American Nebula
NGC6992 gaseous nebula RA:20h56m24.0 Dec:+31°43m'00" BMag: 7.0, CED 182B Veil Nebula
NGC6960 supernova remnant RA:20h45m42.0 Dec:+30°43m'00" BMag: 7.0, LBN 191 Veil Nebula
NGC6888 gaseous nebula RA:20h12m06.5 Dec:+38°21m'18" BMag:10.0, LBN 203 Crescent Nebula
IC1318 gaseous nebula RA:20h22m12.0 Dec:+40°15m'24" BMag: , LBN 245 Gamma Cyg Nebula

cygnus-2007.10.20-16h41m.jpg

[High Resolution : 1600x1200 1057kB]

Camera: Modified Canon EOS 350D (Rebel XT) | Telescope: Canon EF 50mm f1.8 objective | Mount: Orion Skyview Pro, Boxdoerfer PowerFlex MTS-3SLP drive controller | Filters: Astronomik H-alpha 13nm 2", Astronomik OIII 13nm 2", Astronomik SII 13nm 2" | Guiding: - | Exposure: Ha: 12x300s (1h), OIII: 12x300s (1h) SII: 12x300s (1h) ISO800 f2.8, 5 darks, 10 flats CFHT Palette (Ha:OIII:SII) | Software: IRIS, GIMP | Location: 60°31'N 26°52'E (Koivula/Kotka,FI) | Moon illumination 63% | Kuun korkeus +9° | Target altitude in the beginning of the exposure 73°

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Added: 08:09 21/10/2007 UTC