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Iris Nebula - Blog Posts

the-maddest-robot

9 months ago

Photo of the Iris nebula / Caldwell 4 / NGC 7023, I'm very pleased with this one since I finally managed to capture the surrounding dust (barely visible in the 2 previous attempts). This is a reflection nebula, this means that it's a dust cloud reflecting the light from a nearby star. Being one of the brightest reflection nebula visible in the northern hemisphere it's visible in relatively small telescopes (4-6 inch / 100-150mm diameter), unfortunately the outer dust clouds can only be seen on photos. Reflection nebula generally tend to be blue due to a more efficient scattering of blue light compared to red by the dust particles (M45 in my previous post is another good example).