M1 CRAB NEBULA IN SII / H-alpha / OIII
(Taurus 5h34m 22°00')
| M1 with SHO displayed as RGB (left) and HOO displayed as RGB (right). H-alpha is the major contributor to the images and their quality and comprises 151 2-minute exposures of 25, 27 and 28 February, 2022. SII and OIII images each comprise 26 x 2-minute exposures taken on January 28, 2011 (!). Equipment used: 25cm f/D=5.7 Newton with FTT1010M CCD camera fitted with an SHO filter wheel. In fact the HOO-image comes closest to the visual appearance of this (and many other) nebula: H-alpha is deep red, while OIII shows up as a vivid green/blue colour. (Click on the images for a larger version.) |
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| R=SII, G=H-alpha, B=OIII | R=H-alpha, G=OIII, B=OIII |
| Below a slide show of the SII, H-alpha and OIII components of M1 and their 'SHO as RGB' combination. In this case, H-alpha, SII and OIII images each comprise 26 x 2-minute exposures taken on January 28, 2011. |
| Date: | January 28, 2011 |
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| Conditions: | Windy and a bit hazy (naked eye limiting magnitude ~4) |
| CCD: | FTT1010-M |
| Optical: | Prime focus 25cm Newton, f/D=5.7 |
| Filters: | Baader SII, H-alpha and OIII |
| Exposure: | Each color 25x120sec. Luminance is sum of H-alpha and OIII images |
| Processing: | SII grey scale streched. Intenser parts sharpened |