m106 from collimation exercises, Lum only (pfile)

Celestial hemisphere: Northern · Constellation: Canes Venatici (CVn) · Contains: M 106 · NGC 4258

m106 from collimation exercises, Lum only

post-collimation of the AT10RC i let it run on M106 overnight, plus IIRC one more evening before midnight. with the OTA in this position, i think i see equally elongated stars in each corner. when pointed in other directions, i see differing amounts of elongation in the different corners. i have to assume this is from the camera package weighing down on the back of the OTA which in turn moves the primary mirror.

on the left are two uncorrected dust donuts. they are actually the same piece of dust, under corrected and overcorrected in the first night's images. i took the flats the next night rather than in the morning. this has never been a problem in the past, but i have added a rotator to this OTA. when the rotator powers up it rotates thru 180 degrees and back… the rotation must have dislodged the dust right before i did the flats.

i managed to sort of fix these in pixelmath with a circular mask when the image was still linear, but the mask was not exactly the right size, leading to a kind of embossed effect.

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Status	Advanced success
Started	...
Astrometry.net job	7508757
PixInsight job	5RX3W2CR902890XKESRIVWDYY9FP4IGQ
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	12h18m55s.22
RA (top/left)	12h19m56s.39
RA (top/right)	12h20m05s.16
RA (bottom/right)	12h17m53s.36
RA (bottom/left)	12h17m45s.88

Dec (center)	+47°18′28″.8
Dec (top/left)	+47°03′04″.4
Dec (top/right)	+47°32′49″.1
Dec (bottom/right)	+47°33′52″.10
Dec (bottom/left)	+47°04′06″.1

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m106 from collimation exercises, Lum only

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