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CarlosEH
Post Laureate
Reged: 01/19/05
Posts: 3115
Loc: Pembroke Pines, Broward County...
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I made an observation of Jupiter on August 9, 2008 using my 9-inch F/13.5 Maksutov-Cassegrain. Much detail was noted over the planet, especially the North Equatorial Belt (NEB) and South Equatorial Belt (SEB). The seeing conditions were above average (5/10) for a short time before the clouds came in and ended my observing session. I welcome any comments that you may have on my observation.
Date (U.T.): August 9, 2008
Time (U.T.): 03:50
L1 201.1, L2 319.1, L3 316.6
Diameter (Equatorial): 46.4"
Instrument: 9-inch (23-cm) F/13.5 Maksutov-Cassegrain
Magnification: 163x
Seeing (1-10): 5, Antoniadi (I-V): III
Transparency (1-6): 4
Notes:
South Polar Region (SPR): Appears dark to dusky (3-4) and mottled.
South Temperate Zone (STZ): Appears thin and shaded (6/10).
South Temperate Belt (STB): Appears dark to dusky (3-4/10), thin and divided (northern component darker than southern). No ovals visible within it.
South Tropical Zone STrZ): Appears bright (7/10) with a thin, dusky (4/10) band over it's central portion.
South Equatorial Belt (SEB): Appeared dark to dusky (3-4) and containing dark (3/10) dark condensations along it's northern border and bright (7/10) undulating sections (strips) within it (preceding section wider in latitude than following).
Equatorial Zone (EZ): Appeared shaded to bright (6-7/10) with a thin, dusky (4/10) band across the center of it.
North Equatorial Belt (NEB): Appeared dark to dusky (3-4/10) and thin with dark rods (barges) along it's northern border. Blue festoons (3/10) noted along it's southern border.
North Tropical Zone (NTrZ): Appeared bright (7/10), but no other detail visible within it.
North Temperate Belt (NTB): Appeared thin, dark to dusky (3-4/10) and divided by a thin, bright (7/10) zone.
North Polar Region (NPR): Appeared dark to dusky (3-4/10) and mottled.
A digital image made using Photoshop CS3.
The best of luck in your own observations of Jupiter.
Regards,
Carlos
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CarlosEH
Post Laureate
Reged: 01/19/05
Posts: 3115
Loc: Pembroke Pines, Broward County...
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I also made a wide field observation of Jupiter showing all four Galilean satellites. The satellites, from preceding to following, Callisto, Europa, Io, and Ganymede. The observation was made at the same time as the one above.
Carlos
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frank5817
Post Laureate
Reged: 06/13/06
Posts: 3041
Loc: Illinois
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Carlos,
Absolutely gorgeous sketches of Jupiter up close and widefield with moons.   I caught the widefield view last night a bit earlier than your sketch. Always a pleasure to see your beautifully composed images of the night sky.
Frank 
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CarlosEH
Post Laureate
Reged: 01/19/05
Posts: 3115
Loc: Pembroke Pines, Broward County...
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Frank,
Thank you for the compliment on my latest observation of Jupiter. This planet always presents a challenge to the observer to render. I look forward to your excellent observations in the future.
Carlos
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markseibold
sage
Reged: 01/19/08
Posts: 463
Loc: Portland Oregon
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Carlos
Beautiful artwork with your excellent skilled use of CS3.
I particularly like your detailed notes as they provide much to learn from. You have reminded me that I need to add more notes to mine.
Your image observed in a 9 inch Maksutov must be phenomenal.
Excuse me if I am I missing some reading in your notes; I was wondering if you employ any filtration when observing Jupiter as some friends asked me if I use filters. I have but prefer the plain unfiltered view.
I look forward to your next work,
Mark
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Tommy5
Pooh-Bah
Reged: 03/28/04
Posts: 1391
Loc: Chicagoland
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gret sketch of jup, i saw jup in Frank's scope at the local university, i noticed the big rift in the seb and the lack of much festoon action in the eq,great accurate sketch,very accurate colors.
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CarlosEH
Post Laureate
Reged: 01/19/05
Posts: 3115
Loc: Pembroke Pines, Broward County...
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Mark and Tommy,
Thank you for the compliments on my latest observations of Jupiter. I was impressed with the amount of detail visible over the planet.
Filters may be used on Jupiter, and other planets, in order to enhance detail visible. Useful filters to enhance the reddish-brown belts are a light blue (Wratten 80 or 82A) or blue (W38A) filter, depending upon the aperture used. The Great Red Spot (GRS) may also be enhanced by blue (W80, 82A, or 38A) filters, but a magenta (W35) filter may also be employed at times. Blue festoons (and other dark projections) may be enhanced using an orange ((W21), light red (W23A), or red (25) filters.
The best of luck in your own observations of Jupiter.
Carlos
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rodelaet
Carpal Tunnel
Reged: 04/28/06
Posts: 2655
Loc: 50°56' N - 4°58' E (Belgium)
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Carlos,
Magnificent sketches!!!
And excellent observation of the colors!
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Rony
My Astronomy Sketches
My Binocular Sketches
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CarlosEH
Post Laureate
Reged: 01/19/05
Posts: 3115
Loc: Pembroke Pines, Broward County...
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Rony,
Thank you for the compliment on my latest observation of Jupiter and it's satellites. I always enjoy the show that the king of the planets puts on for us all.
Carlos
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rolandlinda3
Carpal Tunnel
Reged: 01/24/06
Posts: 1612
Loc: Crozet VA 22932
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this is fine work. roland
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dlapoint
sage
Reged: 08/18/03
Posts: 452
Loc: Moncton NB Canada
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Very nice! I have a question regarding the detail in the Neb, Seb's. Do you use a color/brightness guide? I can tell some of the darker area's are darker than others. As they look in real life. But I sketch in black and white. It is easy to darken, or brighten any detail. But you sketch is in color. I would guess you have used about 5 shades of the same color to represent the darker belt areas. I find it hard when your sketching a planet like jupiter. Not only are there the details, but the different colors, and shades. A quick sketch can turn into a 4 hour viewing session. Plus the planet turns so fast. Again excellent job!
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Antares 127 F6.5
Skywatcher Pro ED100
Orion 72mm Eon
Orion XT8
C4.5
Naglers 16mm T5, 9mm T6
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CarlosEH
Post Laureate
Reged: 01/19/05
Posts: 3115
Loc: Pembroke Pines, Broward County...
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Roland and dlapoint,
Thank you for your compliments on my latest observation of Jupiter. Drawing Jupiter, as well as the Moon or any other planet, is easier to accomplish in monochrome than color. I have long made my planetary and lunar observations in monochrome (graphite), but have recently started to render using color. This is not as easy as it sounds as many factors are against you. The aperture used, atmospheric haze, altitude of the object above the horizon, among many other factors affect the color noted over a body. Using apertures greater than four inches helps to confirm a color over a planetary surface (e.g. Mars) or atmosphere (e.g. Jupiter or Saturn). Waiting for the planet to highest above the horizon also helps in the detection of a true color. Atmospheric haze will dilute a color over a planet very easily. I sometimes employ a Pantone color swatch which may be obtained at a craft/paint store. This swatch contains many shades of colors which (while using the swatch under a whilte light source) may help the observer determine the color noted over a planet's surface/atmosphere. The key is to practice making observations using color until you are pleased with the result. The best of luck in your own observations.
Link;
http://farm1.static.flickr.com/46/135880344_11ad4f00cb.jpg?v=0
Carlos
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