M 31 HDR, four nights of Andromeda (Michael Timm)

Celestial hemisphere: Northern · Constellation: Andromeda (And) · Contains: 35 And · 35 nu. And · Andromeda Galaxy · HD3431 · HD3765 · HD3969 · HD4143 · HD4174 · HD4322 · HD4501 · HD4669 · M 110 · M 31 · M 32 · NGC 205 · NGC 206 · NGC 221 · NGC 224 · PGC 2160264 · PGC 2164256 · PGC 2166758 · PGC 2167611 · PGC 2168731 · PGC 2168810 · PGC 2169318 · PGC 2170384 · PGC 2171339 · PGC 2171657 · PGC 2172440 · PGC 2174300 · And 45 more.

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M 31 HDR, four nights of Andromeda

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M 31 HDR, four nights of Andromeda

This is probably the detailed image of Messier 31 i took so far. It has seen nearly 14 hours of integration time from three different nights. The seeing was okay on one night and good on the two others. One night it was very humid, the other two nights were okay. The resulting image looks good for me, but maybe i should have been less aggressive regarding stretching. A bit darker and a bit more contrast would probably bring out more details - i don't know, maybe i'll reedit the image. Anyways, the galaxy reveals a lot of details for a 90 mm-scope, i am really happy with it :-)

The processing was again fully done in PixInsight, using the WBPP-script in its latest version. I had to buy another SSD, because PI needs nearly half a terabyte for this :-)

[Update I 2021-11-02] I added about 480 frames of shorter exposures and reedited the image. I wanted to produce a real HDR image, but the difference was so less that i instead decided to integrate all images into one. This time i post-processed more carefully to bring out more details, enhance contrast and don't oversaturate the image. I think it is some sort of personal taste, but the seconed revision looks more natural for my eyes.

[Update II 2021-11-02] Well, despite the fact that the difference in long and short exposures was not so high, i decided to edit the real HDR image and found out that it was worth it :-)

Original
B
C
Final
D

B

Description: Including shorter exposures.

Uploaded: ...

C

Description: The HDR composite image.

Uploaded: ...

D

Description: New postprocessing workflow

Uploaded: ...

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Status	Advanced success
Started	...
Astrometry.net job	6820299
PixInsight job	33GP4X9HVOKGV3N55YLCWN691SFF7LJL
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	00h42m45s.86
RA (top/left)	00h37m23s.55
RA (top/right)	00h51m43s.54
RA (bottom/right)	00h48m22s.90
RA (bottom/left)	00h33m42s.21

Dec (center)	+41°16′26″.7
Dec (top/left)	+39°52′35″.3
Dec (top/right)	+40°53′26″.2
Dec (bottom/right)	+42°39′20″.8
Dec (bottom/left)	+41°36′41″.1

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M 31 HDR, four nights of Andromeda

M 31 HDR, four nights of Andromeda

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M 31 HDR, four nights of Andromeda

M 31 HDR, four nights of Andromeda

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