Jupiter and IO October 18th 2022

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John Baars Netherlands
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Jupiter and IO October 18th 2022

#1

Post by John Baars »


Attached is another sketch of Jupiter. On the 18th the seeing was not really good, but that funny chain and two festoons were , together with the transit of IO once again reason to make a little sketch.

Initially, the seeing left much to be desired. Magnification dropped along to 100X. Because you do have a sharp image at that magnification, but miss the finer details ( that chain and the festoons, for example) a bit, I ended up taking 150X. This not only made the image darker and a bit less contrasty ( it's like self-flagellation) but I also had to wait longer for quiet moments to catch details ( chain link counting).

The first sketch I left for a few days, I didn't think it was that special either. The image of Jupiter-disc sketched here is from more than 15 minutes before the transit. Later I thought it would be a nice idea to include the observed transit of IO. As a result, the picture is actually incorrect, since at the time of the beginning of the transit the orb had already turned a little further.... Fortunately, as a sketcher you can ignore that when it comes to a nice enjoyable picture.

While observing, I switched the location of the barlow a few times: before and after the Atmospheric Dispersion Corrector. With an ADC corrector, the smallest possible f-number is actually necessary (f/21), so first the barlow and then the ADC. But this turned out to be too high a magnification in combination with the Leica ASPH zoom. So I reduced it a bit: first the ADC and then the barlow. As a result the light cone will be f/7.5 for the ADC, but f/15 for the eyepiece. According to the manual, the ADC then works less well; this is barely visually perceptible. With a camera you will probably be punished.
Jupiter 18-okt-2022 (2) - kopie.jpg

Enjoy!
John
Refractors in frequency of use : *SW Evostar 120ED F/7.5 (all round ), * Vixen 102ED F/9 (vintage), both on Vixen GPDX.
GrabnGo on Alt/AZ : *SW Startravel 102 F/5 refractor( widefield, Sun, push-to), *OMC140 Maksutov F/14.3 ( planets).
Most used Eyepieces: *Panoptic 24, *Morpheus 14, *Leica ASPH zoom, *Zeiss barlow, *Pentax XO5.
Commonly used bino's : *Jena 10X50 , * Canon 10X30 IS, *Swarovski Habicht 7X42, * Celestron 15X70, *Kasai 2.3X40
Rijswijk Public Observatory: * Astro-Physics Starfire 130 f/8, * 6 inch Newton, * C9.25, * Meade 14 inch LX600 ACF, *Lunt.
Amateur astronomer since 1970.
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messier 111 Canada
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Re: Jupiter and IO 18th october 2022

#2

Post by messier 111 »


superb sketch , thx .
I LOVE REFRACTORS , :Astronomer1: :sprefac:

REFRACTOR , TS-Optics Doublet SD-APO 125 mm f/7.8 . Lunt 80mm MT Ha Doublet Refractor .

EYEPIECES, Delos , Delite and 26mm Nagler t5 , 2 zoom Svbony 7-21 , Orion Premium Linear BinoViewer .

FILTER , Nebustar 2 tele vue . Apm solar wedge . contrast booster 2 inches .

Mounts , berno mack 3 with telepod , cg-4 motorized , eq6 pro belt drive .

“Your assumptions are your windows on the world. Scrub them off every once in a while, or the light won't come in.”
― Isaac Asimov

Jean-Yves :flags-canada:
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helicon United States of America
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Re: Jupiter and IO 18th october 2022

#3

Post by helicon »


Great sketch John. I assume Io is the tiny bulge/speck on the left hand side of the planet?
-Michael
Refractors: ES AR152 f/6.5 Achromat on Twilight II, Celestron 102mm XLT f/9.8 on Celestron Heavy Duty Alt Az mount, KOWA 90mm spotting scope
Binoculars: Celestron SkyMaster 15x70, Bushnell 10x50
Eyepieces: Various, GSO Superview, 9mm Plossl, Celestron 25mm Plossl
Camera: ZWO ASI 120
Naked Eye: Two Eyeballs
Latitude: 48.7229° N
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John Baars Netherlands
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Re: Jupiter and IO 18th october 2022

#4

Post by John Baars »


helicon wrote: Fri Oct 21, 2022 2:56 pm Great sketch John. I assume Io is the tiny bulge/speck on the left hand side of the planet?
Thanks, yes it is.
Refractors in frequency of use : *SW Evostar 120ED F/7.5 (all round ), * Vixen 102ED F/9 (vintage), both on Vixen GPDX.
GrabnGo on Alt/AZ : *SW Startravel 102 F/5 refractor( widefield, Sun, push-to), *OMC140 Maksutov F/14.3 ( planets).
Most used Eyepieces: *Panoptic 24, *Morpheus 14, *Leica ASPH zoom, *Zeiss barlow, *Pentax XO5.
Commonly used bino's : *Jena 10X50 , * Canon 10X30 IS, *Swarovski Habicht 7X42, * Celestron 15X70, *Kasai 2.3X40
Rijswijk Public Observatory: * Astro-Physics Starfire 130 f/8, * 6 inch Newton, * C9.25, * Meade 14 inch LX600 ACF, *Lunt.
Amateur astronomer since 1970.
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Bigzmey United States of America
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Re: Jupiter and IO October 18th 2022

#5

Post by Bigzmey »


Great sketch John! I have not seen details like these in years due to bad seeing.
Scopes: Stellarvue: SV102ED; Celestron: 9.25" EdgeHD, 8" SCT, 150ST, Onyx 80ED; iOptron: Hankmeister 6" Mak; SW: 7" Mak; Meade: 80ST.
Mounts: SW: SkyTee2, AzGTi; iOptron: AZMP; ES: Twilight I; Bresser: EXOS2; UA: MicroStar.
Binos: APM: 100-90 APO; Canon: IS 15x50; Orion: Binoviewer, LG II 15x70, WV 10x50, Nikon: AE 16x50, 10x50, 8x40.
EPs: Pentax: XWs & XFs; TeleVue: Delites, Panoptic & Plossls; ES: 68, 62; Vixen: SLVs; Baader: BCOs, Aspherics, Mark IV.
Diagonals: Baader: BBHS mirror, Zeiss Spec T2 prism, Clicklock dielectric; TeleVue: Evebrite dielectric; AltairAstro: 2" prism.
Filters: Lumicon: DeepSky, UHC, OIII, H-beta; Baader: Moon & SkyGlow, Contrast Booster, UHC-S, 6-color set; Astronomik: UHC.

Observing: DSOs: 3106 (Completed: Messier, Herschel 1, 2, 3. In progress: H2,500: 2180, S110: 77). Doubles: 2382, Comets: 34, Asteroids: 255
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John Baars Netherlands
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Re: Jupiter and IO October 18th 2022

#6

Post by John Baars »


Bigzmey wrote: Fri Oct 21, 2022 5:51 pm Great sketch John! I have not seen details like these in years due to bad seeing.
Thank you.
In that case, I think your SV102 with BBHS diagonal,combined with the XWs and Delites are best suited to beat seeing. As a refractor the SV is the least sensitive to seeing, colorfast images and a lens diameter large enough for details.

I must honestly say that the ADC goes a long way. Without ADC those red and blue images fluttering over each other, with ADC they are neatly laid on top of each other, also makes a huge difference in the calmness and contrast of the image.
A sketch is actually a sum of short good seeing moments. When I have finished all the details of a sketch, sometimes I am surprised by the overall picture too.
Refractors in frequency of use : *SW Evostar 120ED F/7.5 (all round ), * Vixen 102ED F/9 (vintage), both on Vixen GPDX.
GrabnGo on Alt/AZ : *SW Startravel 102 F/5 refractor( widefield, Sun, push-to), *OMC140 Maksutov F/14.3 ( planets).
Most used Eyepieces: *Panoptic 24, *Morpheus 14, *Leica ASPH zoom, *Zeiss barlow, *Pentax XO5.
Commonly used bino's : *Jena 10X50 , * Canon 10X30 IS, *Swarovski Habicht 7X42, * Celestron 15X70, *Kasai 2.3X40
Rijswijk Public Observatory: * Astro-Physics Starfire 130 f/8, * 6 inch Newton, * C9.25, * Meade 14 inch LX600 ACF, *Lunt.
Amateur astronomer since 1970.
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