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Astounding Aquila.


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Lots of multiples , a very fast star and lots of heavy populated backgrounds. A favourite and overlooked area.

Firstly just a word on magnitude. A numerical change of one magnitude equates to x2.51 difference in brightness. However this is exponential, so that two changes equate to 2.51 squared and three changes to 2.52 power of three. It's amazing to get these differences observing.

Quick mention of Struve Σ and ΣΣ. ΟΣ are in the first 1845 survey of 32" or less, except for fainter than +9.5 up to 16" separation. The ΟΣΣ catalogue followed to give greater separations.

17 Lyrae (SAO 67835) is x2.2 sol diameters.

23 Aquilae (SAO 124487) gives a yellow and outstanding blue, some 22.3 Sol diam.

28 Aquilae (SAO 104722) is a pulsating variable at 3.6 diams.

31 Aquilae (SAO 104807) is the prize here . Very very fast proper IMG_6264.thumb.JPG.d1d1f174822e968715439e2f7de40ef3.JPGIMG_6239.PNG.a9076019262a40d91eb5919758d104b9.PNGIMG_6240.PNG.1c9494086c202990859659527207faaa.PNGmoving. Herschel did not include it , it was just single in appearance.

Catch Σ2547 (SAO 162847), Σ2545 (SAO 162843) and LV21 (SAO 162829) together.

57 Aquilae (SAO 143899)is beautifully bright. 56 Aquilae (SAO 143894) is a wide triple.

π Aquilae (SAO 105282) is a well mentioned orange gem at 1.4", wonderful sight.

Σ198 (SAO 125456) gives a lovely full field of view.

IMG_6265.thumb.JPG.5e3c777abb1826d276784d444185cdcf.JPG

Σ2644 (SAO 125566) is a beautiful sight.

Σ2587 (SAO 125141), a very beautiful delicate B with a reddish A.

15 Aquilae (SAO 142996) gives a yellowish red.

5 Aquilae (SAO 142606) has a third element , which is challenging , but found on a darker night.

ΟΣΣ176 (SAO 124028) was a delight to find the four elements.

Σ2447 (SAO 143029)IMG_6266.thumb.JPG.8630e5afefae39d907150d0697fe2a20.JPG

Σ2404 (SAO 104170) an orange giant.

11 Aquilae (SAO 104332), an eruptive variable, drawn twice to show a darker sky.

Σ2426 (SAO 104332 ) red dwarf 4.4 Sol diameter.

Σ2449 (SAO 124265), some 2.5 Sol diameter.IMG_6267.thumb.JPG.cc0deffe4e922e085e85bafb9ce62dc1.JPG

Tarazed (γ), an orange giant would extend from here half way to Sol, some x2960 as bright.

Eta (η) a dying star and brightest of the Cepheid variables?

Altair, B at 192.3". Some 3400 times brighter than Sol, but with a surface of 5600k emitting visible light.

Σ2590 (SAO 105355), very delicate companion in a full view.

Σ2596 (SAO 105396), 2.0" split and a main star with x9.5 the Sun's energy.

 

 

IMG_6268.thumb.JPG.fabb32640cac97b0ff4007e8fd87588b.JPG

if aked to pick out.  I'd go the last two here, 31 Aquila , Altair and Tarazed, under clear skies !

Nick.

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