Back to astronomy this week with an image of the Witch’s Broom nebula in Cygnus. This is not my data but data given to me by a lecturer at Brockenhurst College. He got professional narrowband data – Ha Hb and O3 – from a Tenerife observatory and I assigned Ha to red, O3 to green and Hb to blue to get this image. Hb data is not usually taken professionally as it offers no more useful information than the Ha channel.
