M 33, Triangulum Galaxy, Wide, QHY268C First Light (Michael Timm)

Celestial hemisphere: Northern · Constellation: Triangulum (Tri) · Contains: IC 131 · IC 132 · IC 133 · IC 135 · IC 136 · IC 137 · IC 142 · IC 143 · M 33 · NGC 588 · NGC 592 · NGC 595 · NGC 598 · NGC 604 · PGC 1916717 · PGC 1928235 · PGC 1928851 · PGC 3084774 · PGC 3084776 · PGC 3084777 · PGC 3084782 · PGC 3089041 · PGC 3095531 · PGC 5899 · Triangulum Galaxy · Triangulum Pinwheel

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M 33, Triangulum Galaxy, Wide, QHY268C First Light

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M 33, Triangulum Galaxy, Wide, QHY268C First Light

So here is my first light with the QHY268C. After having very nice contact with Jarrett Trezzo (thanks again!) i used photographic mode, Gain 26 and Offset 30 for this image. I am somewhat happy, because my biggest fear was that i would not match the correct distance between the reducer and the chip, but after a bit work it worked really great. Using the CCD-Calculators at astronomy.net i knew my desired pixel scale is 1.72"/pixel and guess what? My images showed 1.72"/pixel after a plate solve via nova.astrometry.net :-) So the stars are well shaped among the whole field -> which is bigger than it was with my ASI294 (see original image for the whole image).

I did not use any sort of IR-cutoff filter. I know that this is not ideal for telescopes containing any sort of lenses, but i did it anyway to check all distances work well without any filter-component.

There was just one strange thing i want to take a closer look at in the future: The background was very bright, way brighter than it was with the ASI. And (maybe related) the histogram also looked a bit strange (see at images C & D, histo from a sub). What are these spikes to the left? I am pretty sure that the histo didn't look like this with my ASI.

Original
Final
B
C
D

B

Description: Crop on M 33

Uploaded: ...

C

Description: Histo undebayered

Uploaded: ...

D

Description: Histo debayered

Uploaded: ...

"Nordish by nature"
The OSC Club (One Shot Camera)
The refractors!
Astrophotography Germany
Cooled Color Cams
QHY Users Group

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Status	Advanced success
Started	...
Astrometry.net job	3989316
PixInsight job	SY6RDNRWQ8YB30DWV1RHLWRVH5VY6WAX
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	01h33m54s.29
RA (top/left)	01h31m16s.52
RA (top/right)	01h32m31s.16
RA (bottom/right)	01h36m30s.32
RA (bottom/left)	01h35m18s.39

Dec (center)	+30°38′47″.0
Dec (top/left)	+31°06′27″.0
Dec (top/right)	+29°58′55″.1
Dec (bottom/right)	+30°10′55″.2
Dec (bottom/left)	+31°18′35″.1

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M 33, Triangulum Galaxy, Wide, QHY268C First Light

M 33, Triangulum Galaxy, Wide, QHY268C First Light

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M 33, Triangulum Galaxy, Wide, QHY268C First Light

M 33, Triangulum Galaxy, Wide, QHY268C First Light

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