NGC 2174 (also known as Monkey Head Nebula) is an H II emission nebula located in the constellation Orion and is associated with the open star cluster NGC 2175. It is thought to be located about 6,400 light-years away from Earth. The nebula may have formed through hierarchical collapse.
This is the first time I switched to a full RBI-preflash based workflow. This means that I am using darks of the same duration of the lights (10 minutes) with RBI preflash and no Bias frames for calibration of the light frames. The flats, on the other side, are processed traditionally with normal darks and bias files. This has improved big times the background noise level and gradients I was getting especially with weak signal shots (like narrowband, in this case).
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Target, NGC 2174
Date, 20 December 2014
Images, Ha7 O3 S2- each channel 8x 10 minutes
Optics, Cassegrain f/9 20″ @3550mm
Mount:, ASA DDM85XL
Filters:, from Baader
Software:, ASA Autoslew (beta) for automatic image capture
Processing:, with Pixinsight