NGC 1365 - Short Duration Exposure Experiment (Ian Stephenson)

Celestial hemisphere: Southern · Constellation: Fornax (For) · Contains: NGC 1365

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NGC 1365 - Short Duration Exposure Experiment

Acquisition type: Electronically-Assisted Astronomy (EAA, e.g. based on a live video feed)

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NGC 1365 - Short Duration Exposure Experiment

Acquisition type: Electronically-Assisted Astronomy (EAA, e.g. based on a live video feed)

This is an experimental shot to test the principal of "shorter duration exposure in a light polluted area" actually reduces impact caused by light pollution overexposure leading to better images (Robin Glover of Sharpcap you tube video - my ref to his overall discussion - not his words). I also only cooled to 5'C instead of my normal -10'C as a result of RG comments in the same video.

Instead of shooting at my normal 180 seconds at gain 120 (ASI 294 mc pro) collecting data over two hours - I shot at 30 seconds at gain 120. There was also a quarter Moon. Of the 240 shots I selected the best 120 for stacking in PI. Of those 120 PI rejected 30 during Weighted Batch Pre Processing (I don't know why) leaving 90 subs or 45 minutes of data.

Observations: The subs were peppered with noise . The 30 second darks were not able to fully resolve amp glow and I was also left with dark spots after Cosmetic Calibration. I took two sets of flats - 30% ADU/e and 80%. The 80% batch worked best. The star colours are better than I normally see with 180 second exposures because they were not saturated.

My conclusion. Cooling to +5'C instead of -10"C has no material quality impact - there is a plus, no icing in high humidity. I think 30 seconds is too short but I also think 180 seconds is too long - I am going to try 120 seconds as I think that is a more reasonable number.

I am in a Bortle 6 area

Southern Hemisphere Astro

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Status	Advanced success
Started	...
Astrometry.net job	5411121
PixInsight job	XGFBIGU3IAFXFBZ5PM2NVQ5RP4ZEIFQX
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	03h33m37s.328
RA (top/left)	03h32m28s.296
RA (top/right)	03h34m47s.473
RA (bottom/right)	03h34m45s.994
RA (bottom/left)	03h32m27s.383

Dec (center)	-36°08′10″.41
Dec (top/left)	-36°17′52″.90
Dec (top/right)	-36°17′32″.12
Dec (bottom/right)	-35°58′25″.91
Dec (bottom/left)	-35°58′47″.90

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NGC 1365 - Short Duration Exposure Experiment

NGC 1365 - Short Duration Exposure Experiment

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NGC 1365 - Short Duration Exposure Experiment

NGC 1365 - Short Duration Exposure Experiment

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