Twin Quasar - playing chicken with the Dawes and pixel limits..... (Pam Whitfield)

Celestial hemisphere: Northern · Constellation: Ursa Major (UMa) · Contains: NGC 3073 · NGC 3079

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Twin Quasar - playing chicken with the Dawes and pixel limits.....

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Twin Quasar - playing chicken with the Dawes and pixel limits.....

Didn't feel like starting a big project with short nights so went for another odd target by going for the Twin Quasars QSO 0957+561 A & B after seeing it mentioned in a video. Their separation is only 6", but the Dawes limit of my 102mm scope is 1.14" and native image pixel scale is 1.56". A rough calculation of the Airy disk at 700nm gives about 6 microns so best case I can expect 2 pixels of separation which is about what I see. It might not be a tough target for a bigger scope but it's about as far as I can push my setup - especially with UK skies.

At magnitude +16.7 they're not too faint so a couple of hours of selected subs is enough, especially if you don't bother with the colour channels....

The mount guiding was excellent and the temperature quite stable so focus didn't drift much either.

The wider FOV image is undrizzled so is native pixel resolution (didn't seem much point!). The tight crop is x2 drizzled and with 29 subs it didn't inject too much noise.

Original
B
D
Final
E

B

Description: x2 drizzled and cropped

Uploaded: ...

D

Description: Composite image

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Women Astrophotographers
Yorkshire Astro Imaging
UK Astro-Imaging
KODAK 8300 sensor

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Status	Advanced success
Started	...
Astrometry.net job	4494599
PixInsight job	XPVD01QDHWG0Q9JKTBCL7O9N89KBXK2W
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	10h01m28s.36
RA (top/left)	10h05m15s.52
RA (top/right)	10h05m14s.89
RA (bottom/right)	09h57m33s.40
RA (bottom/left)	09h57m50s.63

Dec (center)	+55°55′21″.6
Dec (top/left)	+55°13′09″.1
Dec (top/right)	+56°38′06″.1
Dec (bottom/right)	+56°37′10″.6
Dec (bottom/left)	+55°12′11″.1

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Twin Quasar - playing chicken with the Dawes and pixel limits.....

Twin Quasar - playing chicken with the Dawes and pixel limits.....

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Twin Quasar - playing chicken with the Dawes and pixel limits.....

Twin Quasar - playing chicken with the Dawes and pixel limits.....

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