markseibold
sage
Reged: 01/19/08
Posts: 463
Loc: Portland Oregon
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To all
What a night for Jupiter! Two simultaneous moon shadow transits of Ganymede and Calisto with the GRS thrown into view for good measure! I could just see several other hollow ovals to the right of the GRS. I assume one of them closest to the GRS is the JRS. (Refer to my rendering) I showed this view through the eyepiece to several neighbors for their first time. I believe I have turned another neighborhood into new astronomers. They cannot wait for the Perseids peak night next week when the local astronomy club will provide many large telescopes 25 miles east of Portland Oregon for their viewing pleasure. This usually draws hundreds of the public to experience their first views through quality optics- Next Monday night will be Jupiter and the first quarter moon again.
In this view tonight at 6:45 UT:
Equipment: 10.1” Coulter Odyssey Dobsonian purchased in 1987- Never collimated.
9.7mm plossl and 6mm Orthoscopic eyepieces to produce 192X and 125X magnification.
Seeing was shaky under a light breeze at first, approx 5 ~ 6/10, then improving to 8 ~ 9/10.
I assembled a Photoshop image in large detail and an accompanyng image below as the apparent size as observed through the eyepiece.
Well I must thank all of you for your inspiring sketches of Jupiter because you got me so intrigued that I even ran in and out of the house from the telescope eyepiece to the computer to render this Photoshop image. This is rather unconventional for me as I really like to use old world mediums like pastel chalks where I get dirty with chalk dust and pigments under my fingernails. So this is just a hiatus for me as I recuperate from a torn muscle. I have swapped my true left hand sketching to instead, the mouse in the right hand and Photoshop for awhile.
I am not sure if Calisto and Ganymede were actually transiting one another or that Calisto was actualy over the planets surface. Can someone confirm that?
Thank you,
-Mark
Edited by markseibold (08/06/08 03:18 AM)
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RLTYS
Carpal Tunnel
Reged: 12/18/04
Posts: 1741
Loc: New York (Long Island)
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mark
A most impressive sketch of a most impressive event.
Thanks for the view.
Rich (RLTYS)
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10" F4.8 Refl.
4" F5 Refr.
50mm F12 Refr. (Tasco #6TE-5)
12x63 and 10x50 Binoculars.
"I want to do more then just look."
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frank5817
Post Laureate
Reged: 06/13/06
Posts: 3041
Loc: Illinois
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Mark,
Fantastic sketching. You have captured the scene I have been waiting for but could not see due to poor weather.
I am thrilled you sketched the view and posted it here.   
Frank 
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Jeff Young
Post Laureate
Reged: 08/04/05
Posts: 3169
Loc: Ireland
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Cool sketch, Mark!
-- Jeff.
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Nikon 18x70s / UA Millennium Colorado:
Solarscope SF70 / TV Pronto / AP400QMD Coronado SolarMax40 DS / Bogen 055+3130
APM MC1610 / Tak FC-100 / AP1200GTO Tak Mewlon 250 / AP600EGTO
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asteroid7
Post Laureate
Reged: 10/19/04
Posts: 3716
Loc: CT
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love the pastel brown color. excellent sketch
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Clear Nights "Make My Day"
4.5" f/7 APM (TMB) APO Refractor on CG5 GoTo with Orion extension tube w/2" WO diagonal
5" Celestron Nexstar
8" Celestron Nexstar (8Ni)
8" Celestron CPC
Eyepieces:
40mm Pentax; 24mm Tele Vue Panoptic, 18mm Tele Vue Radian, 18mm HD Ortho, 15mm Celestron Omini,14mm Pentax,10mm Tele Vue Radian, 7mm Nagler,7.4mm Tele Vue Plossl.
2.5 Tele Vue Powermate
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WadeVC
Carpal Tunnel
Reged: 12/02/05
Posts: 2799
Loc: Lodi, California,
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Mark,
Well I'll be dipped...THAT is just plain awesome!! Very, very nice rendering of your observation and excellent use of colors and detail.
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Orion XTi10 f/4.7
Orion XTi8 f/5.9
Meade NGC 70mm f/10
Orion UltraView 10x50 Wide-Angle Binoculars
My Sketch Gallery
My Astronomy Blog
A wise man can see more from the bottom of a well than a fool can from a mountain top.
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markseibold
sage
Reged: 01/19/08
Posts: 463
Loc: Portland Oregon
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Thanks to all of you as many of you inspired me to 'upgrade' to Photoshop sketching as an alternative while my left side heals.
I am glad that you enjoyed it,
Mark
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CarlosEH
Post Laureate
Reged: 01/19/05
Posts: 3115
Loc: Pembroke Pines, Broward County...
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Mark,
An outstanding observation of Jupiter and a double transit of Galilean satellites. You have captured the appearance of Jupiter and the event very nicely. Thank you for sharing it with us all.
A link to an applet by Sky and Telescope that may prove useful to you; http://www.skyandtelescope.com/observing/objects/javascript/3307071.html#
Carlos
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Tommy5
Pooh-Bah
Reged: 03/28/04
Posts: 1391
Loc: Chicagoland
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Excellant sketch of jup and the moon shadows i also missed this event due to storms,thanks for posting.nice use of digital software.
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Special Ed
Post Laureate
Reged: 05/18/03
Posts: 3531
Loc: Greenbrier Co., WV 38N, 80W
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Nice job, Mark. Transits and shadow transits are always interesting to see, especially as the shadows have such high contrast against the otherwise low contrast background of the Jovian cloudtops. Your digital rendering portrays this very well.
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Michael Rosolina
8" f/10 Orange Tube SCT
4.25" f/4.2 Astroscan Reflector
SVP 3.6" f/13.6 CA Reflector
40mm PST f/10
APM Germany HD 15x70 binoculars
Canon 12x36 IS II binoculars
Mark I Eyeball
My CN Gallery
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JanisR
newbie
Reged: 06/26/08
Posts: 55
Loc: Pennsylvania
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Love the image.
And the "never collimated", too. I'm so lazy that I always found it was easier to simply collimate my brain than my telescope. Fortunately, f/8 systems are pretty forgiving of small collimation issues.
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JanR
My CN Gallery
Edited by JanisR (08/08/08 10:29 AM)
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markseibold
sage
Reged: 01/19/08
Posts: 463
Loc: Portland Oregon
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Thanks to all of you again- I do not really consider my Photoshop renderings as 'real art' but I have honed a process from older Jupiter Photoshop renderings. I would want to improve it yet to show a more real appearance- Note if you have an LCD screen that if you angle your screen up and down, it adjusts the contrast of the overall image just as if the seeing was wavering in and out through the atmosphere.
Also, it is true that my 21 year old Coulter has never been collimated. Checking the image with a Ronchi star test some years ago, the optics are pinched at one edge but adjusments are to no avail- I am told that a new secondary mirror may help- Imagine that I have never cleaned the mirror either? As Jan said, she collimates with her brain while observing. I have also noticed that I can produce an adaptive optical effect by shaking the helical focus and it sharpens the image at that moment- Sounds crazy but I see things that no other can without employing this method: My own Zen and the art of observing with bad optics? You learn to work with what you have. Or the "When in Rome" philosophy.
At a new purchase price of $239 complete + $47 delivery charges in 1987, I cannot complain!
Mark
Edited by markseibold (08/08/08 04:19 PM)
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