davidpretorius
professor emeritus
Reged: 09/25/05
Posts: 575
Loc: Tasmania, Australia
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Seeing was great before the clouds came in.
Very happy with this result
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Davo
10" peltier cooled Next with dob driver II, Lu075 camera
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WahHK
sage
Reged: 02/24/06
Posts: 273
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Really amazing result!
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http://wahwah.dyndns.org:8080/gallery/main.php
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davidpretorius
professor emeritus
Reged: 09/25/05
Posts: 575
Loc: Tasmania, Australia
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the 1.5x mitchell resample
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Davo
10" peltier cooled Next with dob driver II, Lu075 camera
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davidpretorius
professor emeritus
Reged: 09/25/05
Posts: 575
Loc: Tasmania, Australia
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processing part 1.
the raw data, split rgb and increasing wavelets from left to right.
top blue, middle green, bottom red
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Davo
10" peltier cooled Next with dob driver II, Lu075 camera
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davidpretorius
professor emeritus
Reged: 09/25/05
Posts: 575
Loc: Tasmania, Australia
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processing part II.
blue channel with 100, 200 and 300+ stacked with increasing wavelets.
Trying to find for each channel, best stack size / wavelets.
ME deconvolution in astra image will clean up a slightly splotchy / over waveletted image.
All images from registax are saved as .tiff
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Davo
10" peltier cooled Next with dob driver II, Lu075 camera
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gazerjim
Postmaster
Reged: 02/12/04
Posts: 7725
Loc: About where I thought I was......
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David: Killer pics! One at lower right corner of four is especially nice.
Jim
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Jim Fisher
If you're not part of the solution, you're part of the precipitate.
Henry J. Tillman
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davidpretorius
professor emeritus
Reged: 09/25/05
Posts: 575
Loc: Tasmania, Australia
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thanks jim, i will repost that, it is a 1.5x resample, but in posting, it has been rescaled.
the data held up well to the resample
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Davo
10" peltier cooled Next with dob driver II, Lu075 camera
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Sean McDaniel
sage
Reged: 10/17/05
Posts: 425
Loc: ashburn, va
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awesome!
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sean mcdaniel
ns11
toucam pro ii
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davidpretorius
professor emeritus
Reged: 09/25/05
Posts: 575
Loc: Tasmania, Australia
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Hey Jim,
here is the full size resample, i must remember this forum is the only one that resizes the image
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Davo
10" peltier cooled Next with dob driver II, Lu075 camera
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Levi
sage
Reged: 12/17/05
Posts: 467
Loc: Camarillo CA
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Davo,
Congats on some fine imaging and super processing.. you da man!
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Levi
http://www.imageevent.com/cabinetry
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gazerjim
Postmaster
Reged: 02/12/04
Posts: 7725
Loc: About where I thought I was......
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David: Image held up well to resampling indeed!
Jim
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Jim Fisher
If you're not part of the solution, you're part of the precipitate.
Henry J. Tillman
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David Rivas
Carpal Tunnel
Reged: 05/29/04
Posts: 2004
Loc: Lima, Peru
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David,
Excellent job mate!!
Great detail and color!!
Also, seems like a new great resampler was just born :-)
Hugs,
David
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Anonymous
Unregistered
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Great image David!!
Glad someone is getting the good conditions on these transits.
I prefer the original size one at the top but Io looks grand! resampled.
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RedIrocZ-28
Pooh-Bah
Reged: 09/18/05
Posts: 1017
Loc: Grand Rapids, Michigan
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Davo, thats a disgustingly LARGE image in the resample! WOW! (And don't take that the wrong way, its probably considered slang depending on where you are from) Its amazing that you guys from down under are able to blow up Jupiter images to a point where they are nearing 7" across on my moniter here with immensely crisp details spanning the entire globe. Well done, I could only hope for the opportunity to see Jupiter at the elevation you guys are. I agree with David, the color is just spot on and the resample did nothing to detract from its resolution! 
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davidpretorius
professor emeritus
Reged: 09/25/05
Posts: 575
Loc: Tasmania, Australia
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Thanks guys, i don't like to resample normally, as it feels a bit like cheating, well sort of and the data has to be so great to start with.
Hey you guys will start to have jup up high in a few years.
We must plan a trip somewhere in the next 10 years to catch up ie barbados, fiji etc where it has the moderating weather of the ocean and non jetstream.
1 week of imaging, 1 week of processing, 1 week of just breathing!
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Davo
10" peltier cooled Next with dob driver II, Lu075 camera
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EdZ
Professor EdZ
Reged: 02/15/02
Posts: 12565
Loc: Cumberland, R I , USA42N71.4W
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David,
this very nice picture may help answer some questions that arose in another forum. I'll repeat some of the info here.
original question.
Can Jupiter Shadow transits be seen with binoculars? What would be smallest aperture and magnification needed to view?
In the quest to find that answer, several more questions came up. First was this;
Is the shadow that we see the umbral shadow or the penumbral shadow?
The umbral shadow is the converging cone where the shadow spot on the planet would be smaller than the moon disk. The penumbral shadow is the diverging cone where the shadow on the planet disk is actually larger in diameter than the moon.
Given the date and time you provided,
This is a photo of Io and it shadow, both just shortly after transit ingress.
Jupiter is currently about 4.4 AU from Earth and about 5.4AU from the Sun.
Jupiter is 88000 miles in diameter
Io is 2260 miles in diameter
Io is about 218,000 miles above the planet surface.
Jupiter currently appears about 44 arcseconds
Io currently appears about 1.1 arcseconds
With these data, Io would have
an umbral shadow of 0.9 arcseconds
and a penumbral shadow of 1.4 arcseconds.
Diffraction would make the bright moon disk very slightly larger
and it would also make the dark shadow spot very slightly smaller.
By the looks of this picture, the shadow is about the same size as the moon disk. That may lead to answer one question. We may see the umbra shadow, not the penumbral shadow.
Unfortunately, its a close call due to diffraction. Maybe a shadow transit of Ganymede will shed more light on the subject.
While it may not appear as such at first glance, the widest portion of the moon disk is ever so slightly wider than the shadow spot. BTW, measurements using a 1/32" scale from an 8.5x11 printout come within <4% error for the size of the moon disk (assuming the planet is currently 44 arcseconds), easily accounted for in diffraction or measuring error.
I will be looking into this some more, but this forum seems to be a good start and it was here that I found your photo. I'm leaning towards what is seen is the umbral shadow, but more info is needed. Thanks. Please take more photos.
edz
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Teach a kid something today. The feeling you'll get is one of life's greatest rewards.
member#21
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davidpretorius
professor emeritus
Reged: 09/25/05
Posts: 575
Loc: Tasmania, Australia
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Top questions Edz, i will keep in mind on future imagain sessions.
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Davo
10" peltier cooled Next with dob driver II, Lu075 camera
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Southpaw
Carpal Tunnel
Reged: 12/30/03
Posts: 1870
Loc: Burleson, TX
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Very nice! Thanks for sharing.
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Chad
16" f/4.5 Starfinder EQ.Bartelized!
Losmandy G-11/Gemini
Orion 80ED Moonlite CF1-s
Orion 80mm Guidescope
Meade 114/500 4.5" f/8
Canon Rebel XT(unmodified)
ST-7ME
QHY 6302CE CCD
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Joel F.
Pooh-Bah
Reged: 03/19/06
Posts: 1121
Loc: Overland Park, Kansas
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Dave,
Great shots!! Thanks for showing the different steps!
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Joel Falk in Kansas
14.5" f/4.3 AstroSky with GOTO/Tracking and
Stevens Optics
10" Orion XTi
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