The Iris Nebula (also known as NGC 7023 and Caldwell 4) is a bright reflection nebula in the constellation Cepheus. The nebula is illuminated by a magnitude +7.4 star designated HD 200775 and it's located 1 300 light years from earth.
It was one of those nights, you get a clear night unexpectedly, but the moon is very bright, and you have very limited options. I could only image to the north and only with narrowband filters, so I thought why not gather some Ha data on the Iris Nebula. I ended up with almost 10 hours of usable Ha data and started to think about how to blend that in with my existing LGRB data.
Data for this image: 113x300s Ha, 18x120s + 31x300s L, 20x120s + 11x300s R, 18x200s + 10x300s G, 24x120s + 10x300s B. Total number of exposures 255 with a total integration time of 17.2 hours.
Processing: PixInsight with LHaGB palette with RGB stars. Data for this image was gathered from 2023 and 2024.
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4 сен 2024
