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23 Aquila challenging split !!!!


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Anyone up for this little challenge ?

AB: 5.19+8.76 mag, STF2492, ADS 12289, B=HIP 94885
PA 4° Sep 3.00" (1997)

from sky tools,

On this night 23 Aql is best visible between 20:37 and 02:44, with the optimum view at 23:23. Look for it in Aquila, high in the sky in complete darkness. It is obvious visually in the towa 80mm f15. Use the Super Plössl 20mm for optimum visual detection.

                                                                                   mike h

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pretty much the same here with the 80mm Vixen plus my 6" f11.  I was initially using a bit too much power and around 100x gave the cleanest views. for some reason I was surprised by the small size of the secondary, expecting them to be closer in magnitude - obviously I need to read more carefully!

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Lovely close uneven brightness double  :smiley:

Just got it with my 4" refractor @ 95x. Somewhat easier at 132x though. The secondary is just a tiny spark of light just outside the diffraction ring of the primary. Thanks for the "heads up" :smiley:

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Quite a pretty pair in my 127 Mak. At x125, the companion is a blueish blob beside the orange primary; as the scope cooled, the blob changed to a bright electric blue pinpoint, sitting just on the diffraction ring. Colours best with the stars slightly defocussed.

Because of the relatively large central obstruction, and consequent "fat" diffraction ring structure, closish doubles often end up sitting on or beside a ring.

Best mag was x125, although the separation was more obvious at x190 and x250. Interesting that Admiral Smyth and Sissy reckoned that you need high mag for this pair??

PA close to, or just greater than, 0 degrees (ie N)??

Chris

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Best mag was x125, although the separation was more obvious at x190 and x250. Interesting that Admiral Smyth and Sissy reckoned that you need high mag for this pair??

Interesting comments on the magnification. Like Shane I felt that pushing the magnification resulted in a much poorer image for me, although the separation was clearer (at 225x). Better at something over 100x (I was using a mixture of my Hyperion zoom to get 10mm, a 15mm Kellner and 5mm BGO in my TAL125). As I noted in my earlier post I could just split at 75x, but not a hint at lower powers.

As for colours, I must admit I didn't see any blue in the secondary. I noted the primary as yellow/white and the secondary as a white spark.

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I also found the secondary to be a bluish tint as well .

                                                                                     mike h

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Lovely close uneven brightness double  :smiley:

Just got it with my 4" refractor @ 95x. Somewhat easier at 132x though. The secondary is just a tiny spark of light just outside the diffraction ring of the primary. Thanks for the "heads up" :smiley:

Certainly look good in an ED 'frac - in my wee ED80 last night the pair looked glorious, with very clean colours.

Chris

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hi Chris, you say you have old eyeballs but they certainly extract star colours better than most (me included) :smiley:

I agree with that Shane, I think Chris has bionic eyes ;-)

Sent from my iPhone using Tapatalk

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Maybe the biosensitization effect of espresso, chocolate and Shiraz?

Chris

All in one glass? Now there's a combination I haven't tried ;-)

Sent from my iPhone using Tapatalk

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I wonder if the apparent colour of this pair is governed by LP? For me, SSE (direction of 23 Aql) is the darkest direction and the sky is not obviously orange. Even through my finder (RACI 10x50) the primary is a strong orange colour - maybe this would be bleached somewhat if the sky were Na D orange?? With an orange primary, the secondary is likely to look blueish anyway IMO.

Espresso, chocolate and Shiraz in the same glass sounds a bit of a challenge, although I have had Jaffa cakes  dunked in rum on one observing evening last year......

Chris

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