M3 (Chris Ashford)

Celestial hemisphere: Northern · Constellation: Canes Venatici (CVn) · Contains: HD119081 · HD119391 · M 3 · NGC 5272

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M3

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M3

I've been having issues with high FWHM figures, so I serviced my autofocuser - removed it, cleaned up the mechanism and applied new grease to the telescope focusing mechanism. Plus tightened up all the screws...some had started to loosen off a little. And now my FWHM numbers have improved significantly.

In the last month I had been rejecting a lot of subfranes due to poor focusing which I initially attributed to poor seeing. But now I see that it was the EAF all along, and in this image my FWHM numbers are in the 2-3 range, as opposed to 3-5 last month. The ED127 best possible FWHM figure is 0.92, but practically speaking that is impossible to achieve due to atmospheric turbulence, even on the best night. i consider anything around 2 to be excellent

. The median value of the subs for this image was 2.425.

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Status	Advanced success
Started	...
Astrometry.net job	7529123
PixInsight job	RBOER9UOHZIF5TG46QW3F0YCG3UZ0JPG
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	13h42m11s.41
RA (top/left)	13h40m28s.97
RA (top/right)	13h40m34s.53
RA (bottom/right)	13h43m52s.99
RA (bottom/left)	13h43m49s.28

Dec (center)	+28°22′27″.2
Dec (top/left)	+28°50′09″.7
Dec (top/right)	+27°53′52″.7
Dec (bottom/right)	+27°54′40″.1
Dec (bottom/left)	+28°50′57″.10

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