Sh2 - 101, The Tulip nebula. This patch of nebulosity lies in the constellation of Cygnus the Swan at a distance of about 6,000 light years. There is believed to be a black hole to the west of it. The sky conditions were very poor with high cirrus reflecting the moon light, stars were only visible down to about magnitude 3.5.
I was using my ten inch F4/8 reflector, a Vixen Atlux mount, PHD auto guiding, a set of Astronomik narrowband filters, S11, O111, HA, a blue filter and my Atik 383L mono CCD camera .
I captured five minute sub frames with matching dark frames and combined them with flat field frames to reduce the effect of noise and vignetting in the final image . The total exposure time was 90 minutes using a H Alpha filter , 30 minutes using an O111 filter , 25 minutes using a S11 filter and ten minute using a blue filter.
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