NGC 3953 & NGC 3917 - 8" RC (Andrew Burwell)

Celestial hemisphere: Northern · Constellation: Ursa Major (UMa) · Contains: NGC 3917 · NGC 3931 · NGC 3953 · PGC 213886 · PGC 213888 · PGC 213892 · PGC 213899 · PGC 213900 · PGC 2396278 · PGC 2396289 · PGC 2396788 · PGC 2397526 · PGC 2397658 · PGC 2397890 · PGC 2398035 · PGC 2398810 · PGC 2399182 · PGC 2400472 · PGC 2401133 · PGC 2401727 · PGC 2402241 · PGC 2402633 · PGC 2402958 · PGC 2405438 · PGC 2407686 · PGC 2407838 · PGC 2409656 · PGC 2409699 · PGC 2409819 · PGC 2410612 · And 17 more.

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NGC 3953 & NGC 3917 - 8" RC

Link: https://www.macobservatory.com

Powered byPixInsight

NGC 3953 & NGC 3917 - 8" RC

Link: https://www.macobservatory.com

I had shot this a few weeks ago without inspecting the collimation of my telescope at the time. Collimation was poor, and the resultant image wasn't that great. But I did manage to get out and run through the DSI collimate method for RC scopes, and it improved substantially as the primary mirror was off despite using a Takahashi collimation scope to align the primary and secondary.

I still see some uniform outer corner artifacts on this APSc sensor. I think they could be fixed with a reducer/corrector instead of the CCDT67 telecompressor I'm using right now which doesn't do any correction. Alternatively I could use my ZWO ASI1600 chip, which is smaller and would crop out the artifacts.

Ritchey Chretien telescopes GSO Family

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Status	Advanced success
Started	...
Astrometry.net job	3421449
PixInsight job	3XMFO3AR6TG00R4FY8BD7S4QRPWITKKQ
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	11h52m03s.690
RA (top/left)	11h49m53s.786
RA (top/right)	11h49m16s.231
RA (bottom/right)	11h54m10s.112
RA (bottom/left)	11h54m55s.261

Dec (center)	+52°06′42″.80
Dec (top/left)	+52°43′27″.73
Dec (top/right)	+51°33′54″.76
Dec (bottom/right)	+51°29′47″.75
Dec (bottom/left)	+52°39′13″.93

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NGC 3953 & NGC 3917 - 8" RC

NGC 3953 & NGC 3917 - 8" RC

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NGC 3953 & NGC 3917 - 8" RC

NGC 3953 & NGC 3917 - 8" RC

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