The LHaSIIRGB image of the Crab Nebula (Messier 1/NGC1952), the first astronomical object identified witha historical supernova explosion (SN 1054AD). The data for this image was obtained with 250mm f/4.0 Lacerta PhotoNewton and ZWO ASI183MM Pro camera over several nights in September-November 2019. The final L and RGB images are stacks of the 20s exposures with star FWHM < 3" to reduce the effect of poor seeing. The synthetic R band image is a combination of the original R data and narrowband data taken in Ha (5 nm) and SII (8 nm) bandpasses. Individual broadband and narrowband exposures were taken at camera gain 110 and 200. The addition of narrowband data helps to emphasize the intricate filamentary structure of the expanding outer layers of the progenitor star.
Exposure information:
L: 257x20s (Gain 200, bin 1x1), 52x20s (Gain 110, bin 1x1), 32x30s (Gain 110, bin 1x1)
Ha: 23x180s (Gain 200, bin 1x1)
SII: 20x300s (Gain 110, bin 1x1)
R: 846x20s (Gain 200, bin 1x1)
G: 241x20s (Gain 200, bin 1x1)
B: 214x20s (Gain 200, bin 1x1)
Total exposure: 12.0 hrs
The original LRGB image can be found here:
https://www.astrobin.com/xrr9uq
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