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

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

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Testing: 10 min guided subs on the Iris Nebula

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Testing: 10 min guided subs on the Iris Nebula

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.

Nebulas - Widefield and Mosaics

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Status	Advanced success
Started	...
Astrometry.net job	5092661
PixInsight job	HYMC7UPBCENJKTL6YPN361C07IV9A5DV
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	21h01m43s.71
RA (top/left)	20h53m02s.82
RA (top/right)	20h52m51s.52
RA (bottom/right)	21h09m47s.60
RA (bottom/left)	21h11m13s.35

Dec (center)	+68°10′05″.7
Dec (top/left)	+69°00′27″.0
Dec (top/right)	+67°22′32″.9
Dec (bottom/right)	+67°18′11″.1
Dec (bottom/left)	+68°55′45″.5

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Testing: 10 min guided subs on the Iris Nebula

Testing: 10 min guided subs on the Iris Nebula

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Testing: 10 min guided subs on the Iris Nebula

Testing: 10 min guided subs on the Iris Nebula

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