Celestial hemisphere:  Northern  ·  Constellation: Cepheus (Cep)  ·  Contains:  Iris Nebula  ·  LBN 487  ·  LDN 1168  ·  LDN 1170  ·  LDN 1171  ·  LDN 1172  ·  LDN 1173  ·  LDN 1174  ·  NGC 7023  ·  PGC 2817439  ·  T Cep  ·  VdB139
Testing: 10 min guided subs on the Iris Nebula, Paul Macklin
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Testing: 10 min guided subs on the Iris Nebula

Testing: 10 min guided subs on the Iris Nebula, Paul Macklin
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Testing: 10 min guided subs on the Iris Nebula

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Description

Testing 10 min guided subs on the cem26 after some mesh tightening on the DEC axis. 

Ordinarily I use unidirectional DEC guiding, but this time I tried auto but with a very low (25%) DEC aggression, so that a shallow backlash would be spread over longer times (lower amplitude, but longer period), rather than a harsh backlash over shorter times (short period, but high amplitude.)

This seemed to keep DEC backlash ~ 1-1.5", which is within the 2" resolution of my optical train. 

Iris Nebula is challenging from my Bortle 7 backyard. Definitely need more photons, and so far I find 6 min subs get plenty of signal, with more samples to refine SNR in stacking.

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Testing: 10 min guided subs on the Iris Nebula, Paul Macklin