M33, Triangulum Galaxy, Vixen 81s + Altair 183C

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turfpit
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M33, Triangulum Galaxy, Vixen 81s + Altair 183C

Post by turfpit » Sun Sep 08, 2019 11:32 am

7 Sep 2019, intermittent cloud, moon had set.

Equipment: Celestron AVX mount, Vixen 81s refractor, Altair 1.0x flattener, Altair 183C V2, no filters.
Capture: 80x90s, 80 darks, 100 bias, 100 flats. Unguided. Focus with Bahtinov Mask.
Software: SharpCap 3.2, FITS Liberator (to inspect test frame), Siril (calibration, registration, stacking, crop, colour calibration, green noise removal), Gimp (Curves, Saturation, Contrast).
Capture settings were RAW12, gain 400, black level 50 (black level established by using lowest value which gives centralised histogram for bias frame at gain 400).

25 frames failed to register (due to cloud). Not ideal conditions and this object really needs as much data as possible.

_M33-80x90s-best-55-stacked.jpg
_M33-80x90s-best-55-stacked.jpg (264.93 KiB) Viewed 233 times

test frame viewed in FITS Liberator to check histogram min and max image statistics.

histogram-for-light-frame.JPG
histogram-for-light-frame.JPG (38.38 KiB) Viewed 233 times


Dave

[ALTAIRH183C]
Debayer Preview=On
Output Format=FITS files (*.fits)
Capture Area=5440x3648
Binning=1x1
Pan=0
Tilt=0
Colour Space=RAW12
Fan=On
Temperature=9.7
Black Level=50
USB Speed=1
Auto Exp Target=120
Frame Rate Limit=Maximum
Analogue Gain=400
Exposure=90000
Timestamp Frames=Off
Banding Threshold=35
Banding Suppression=0
Apply Flat=None
Subtract Dark=None
#Black Point
Display Black Point=0.017578125
#MidTone Point
Display MidTone Point=0.0315231961756746
#White Point
Display White Point=0.998046875
TimeStamp=2019-09-07T23:16:57.5507975Z
SharpCapVersion=3.2.6097.0

nexusjeep
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Re: M33, Triangulum Galaxy, Vixen 81s + Altair 183C

Post by nexusjeep » Sun Sep 08, 2019 11:45 am

Hi Dave,

Nice shot the clouds lately are a bit of a pain in the butt as it starts out nice then deteriorates usually just after you get everything setup and start imaging. Hopefully as Autumn / Winter sets in it might settle down a little it was cool last night as it dropped to 6.5c whilst I was imaging.

Cheers
Nick

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turfpit
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Re: M33, Triangulum Galaxy, Vixen 81s + Altair 183C

Post by turfpit » Sun Sep 08, 2019 11:57 am

Thanks Nick. The conditions have been less than optimal over recent weeks.

Dave

BlackWikkett
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Re: M33, Triangulum Galaxy, Vixen 81s + Altair 183C

Post by BlackWikkett » Sun Sep 08, 2019 6:50 pm

Nice Image Dave!

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turfpit
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Re: M33, Triangulum Galaxy, Vixen 81s + Altair 183C

Post by turfpit » Mon Sep 09, 2019 7:31 pm

Thanks Wikkett. I have been looking around on disks for my last effort at this object. I think I may have removed all traces of it - not that there was much to see.

Dave

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