Stephan's Quintet (Sendhil Chinnasamy)

Celestial hemisphere: Northern · Constellation: Pegasus (Peg) · Contains: NGC 7317 · NGC 7318 · NGC 7319 · NGC 7320 · Stephan's Quintet

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Stephan's Quintet

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Stephan's Quintet

Finally got a breakthrough in my L flat calibration. I have a light panel behind the scope and put the mount at Park 4 position and shoot flats. The last couple nights and days, I have tested several weird combinations, put the scope in Park 4, turn on cam take flats; Turn on cam, then put in park 4...no luck. The donut stayed at the same spot. Just off by a hair when compared with the lights.

So last night I ran a test sky flats and calibrated, and it just worked fine. Which makes me wonder if at Park 4 the FW carousel is getting shifted every so slightly by gravity. Can't think of anything else that would cause a miscalibration. R G B work fine as those filters are clean at the moment.

This is not a great image by any means and with the moon up in the face, I just went with this target to test LRGB calibration.

Clear skies!

Final
Original
B
C
D

B

Title: No baffle - L flat

Description: This is what I was facing when imaging two RGB targets mid august, a central hot spot that resulted in the stacked Master light to have the reverse effect. Hazy and bright center and immediate light drop off

Uploaded: ...

D

Title: Flat after using an extension on the primary baffle

Description: A fellow astrophotographer in the next obs 3D printed an extension tube and when inserted, it just blunted the whole hot spot. One thing I am not a 100% certain is if there is any loss of good light remotely and I have no means to test other than comparing data on the same targets I attempted back in August.

Uploaded: ...

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Status	Advanced success
Started	...
Astrometry.net job	8657584
PixInsight job	2010EXQH03ASIX9N181MM1O1HHZ0RHO0
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	22h35m57s.190
RA (top/left)	22h34m50s.835
RA (top/right)	22h37m03s.276
RA (bottom/right)	22h37m03s.439
RA (bottom/left)	22h34m50s.528

Dec (center)	+33°57′45″.24
Dec (top/left)	+33°48′34″.40
Dec (top/right)	+33°48′36″.70
Dec (bottom/right)	+34°06′53″.96
Dec (bottom/left)	+34°06′52″.23

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