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Saturn Observation (April 20, 2011)

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#1 CarlosEH

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Posted 21 April 2011 - 02:15 AM

I made an observation of Saturn on April 20, 2011. The region between the North Temperate Zone (NTZ) and North Tropical Zone (NTrZ) was active and complex as described below. I welcome any comments on my observations.

Date (U.T.): April 20, 2011
Time (U.T.): 02:30
L1 315.8*, L2 105.7*, L3 102.8*
De 8.1*, Ds 9.0*, 0.5m, 19.1" (Equatorial)
Instrument: 9-inch (23-cm) F/13.5 Maksutov-Cassegrain
Magnification: 207x, 310x, and 388x
Filters: None (IL)
Seeing (1-10): 6-7, Antoniadi (I-V): III-II
Transparency (1-6): 5

Notes:
North Polar Region (NPR): The northern limb (pole) exhibits a dark (3/10) elliptical center. The region appears dusky to shaded (4-6/10) and mottled (greenish-brown).
North Temperate Zone (NTZ): Appears thin, bright (7/10) sections and irregular. These albedo features represent remnants of the NTrZ storm.
North Temperate Belt (NTB): Appears dark to dusky (3-4/10) and irregular.
North Tropical Zone (NTrZ): Appears to contain bright to very (7-8/10) sections with dark to dusky (3-4/10) diagonal columns across it connecting to the NTB to the NEB. The bright sections represent the remnants of the NTrZ storm.
North Equatorial Belt (NEB): Appears broad and dark to dusky (3-4/10). The northern and southern borders appear irregular.
Equatorial Zone (EZ): Appears shaded to bright (6-7/10), but no other detail is noted within.
Shadow of Ring on the Globe: Appears very to extremely dark (2/10) and diffuse.
South Equatorial Belt (SEB): Appears dark to dusky (3-4/10) and thin.
South Polar Region (SPR): Appears dusky to dull (4-5/10) and mottled (greenish-brown).

Ring A: The outer half of the ring appears dusky (4/10) and a pastel reddish-brown color. The inner half appears shaded (6/10) and light pastel yellow-orange color.
Ring B: The outer half appears bright (7/10) and the inner half contains dusky to dull (4-5/10) streaks.
Ring C (Crepe): Appears dusky (4/10) and translucent.

Satellites: Rhea (10.16m) and Dione (10.83m) are visible following the planet.

A digital image produced in Pixelmator.

Carlos

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#2 CarlosEH

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Posted 21 April 2011 - 02:23 AM

A wide field observation of Saturn and four of it's satellites. The satellites visible were Titan (8.83m), Rhea (10.16m), Dione (10.38m), and Tethys (10.68m), preceding to following.

A digital image produced in Pixelmator.

Carlos

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#3 CarlosEH

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Posted 21 April 2011 - 02:28 AM

A sectional sketch of the northern hemisphere of Saturn. The North Polar Region appears mottled (greenish-brown) with a dusky (4/10) cap. The North Temperate Zone (NTZ) appears thin with bright (7/10) sections and dusky (4/10) columns. The North Temperate Belt (NTB) appears thin and dusky (4/10). The North Tropical Zone (NTrZ) storm appears appears bright to very bright (7-8/10) sections are divided by dusky (4/10) columns. The North Equatorial Belt (NEB) appears dark to dusky (3-4/10) with irregular borders. The Equatorial Zone (EZ) appears bright (7/10).

A digital image produced in Pixelmator.

Carlos

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#4 Astrojensen

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Posted 21 April 2011 - 03:11 AM

Ooh! Stunning, stunning!

I've wanted to observe Saturn for the last couple of days, but the seeing has been poor. 100x - 120x has been soft and boiling in the C8.


Clear skies!
Thomas, Denmark

#5 Rutilus

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Posted 21 April 2011 - 04:33 AM

Carlos - Excellent, lots of detail visible in your drawing.
I observed Saturn at 00:15UT on the 20th, I also noted the bright outer edge of Ring B and the dark shadow of the ring on the globe.

#6 thrawn

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Posted 21 April 2011 - 07:22 AM

Great set, I enjoy the color here more than the browner April 15th set.

Here's a question: does the sectional view have a different color balance vs. the first image?

Asking that made me realize that you probably use a tool to calibrate your monitor to better convey your digital vision.

Thanks,

#7 JimP

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Posted 21 April 2011 - 08:01 AM

Beautiful Carlos!!!

Jim Phillips

#8 Scopyfrank

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Posted 21 April 2011 - 09:19 AM

Wonderful, when premium scopes meet art.

#9 astroducky

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Posted 21 April 2011 - 11:36 AM

Amazing sketch and details! I was observing Saturn on 17th April at 1800h UT. I could see about 5 white storms but it was not very bright and not lined up nicely in a row.. and pretty small even at 416x. Are there more storm activities on the other side of Saturn's globe during that time? Are the storms occurring throughout the circumference of Saturn's globe? Thanks.

#10 chrisrnuttall

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Posted 21 April 2011 - 12:41 PM

Carlos

Interesting to see that this is a similar L3 longitude to your last sketch, and the storm trail seems quite different, it is more spread i]out north-South, and yellower ie fading into the planets regular hue.

Beautifully rendered too!

#11 CarlosEH

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Posted 21 April 2011 - 06:00 PM

Thank you all very much for the kind compliments on my latest set of Saturn observations. The NTrZ-NTZ storm has been very interesting to follow. It appears to change over a span of a few days. Images of the storm (posted on CN) show the development of the storm very nicely. I have provided two links below to images posted of the NTrZ storm in the CN Solar System Imaging & Processing Forum.

Links;
http://www.cloudynig...5/o/all/fpart/1
http://www.cloudynig.../sb/5/o/all/fpa

Suneet- The sectional sketch colors are the same as the full disk drawing. I hope that this helps. The best of luck in your own observations.

Carlos

#12 frank5817

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Posted 22 April 2011 - 12:59 AM

Carlos,

Great sketching in all three works.
The remnants of the storm continue to show changes. Your treatment of Saturn detail is always most impressive in your sketches.
Your written descriptions of the details helps bring them out in subsequent examination of your renderings.
Wonderful work Carlos.

Frank :)

#13 Paul G. Abel

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Posted 22 April 2011 - 05:24 AM

Hi Carlos,

Great observation! As you can see in my post, I was observing a few hours earlier (we stopped at 0020UT due to the bad seeing). One thing I did note is that Titan was the most intense Orange I have ever seen it!!!!

Always nice to see your work!
-Paul.

#14 Tommy5

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Posted 22 April 2011 - 12:58 PM

Another fine sketch your detail is amazing, better then most webcam photos and a definitive study of Saturn this season.

#15 Andrev

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Posted 22 April 2011 - 06:37 PM

Carlos.

Very nice sketch. Beautiful. Tell me. Its what you see in your scope ??? Gee, your seeing conditions are remarkable as I still didn`t see the cassidi division yet in my C14 !!! To date, none of Mercury, Venus, Jupiter and Saturn gave me a real satisfaction.

Andre.

#16 CarlosEH

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Posted 23 April 2011 - 12:55 AM

Thank you all for the compliments on my Saturn observations. The amount of detail visible over the globe and rings was impressive.

Paul- I agree that Titan presents a strong orange color this season. Your Saturn observations are very impressive as well.

Andre- My observations of Saturn display what I noted in my instrument. I am fortunate to enjoy good seeing conditions in South Florida on a regular basis. I have seen impressive detail over the planets and Moon from my location over time. I hope that you experience good seeing in order to detect detail over the planets.

Carlos

#17 azure1961p

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Posted 23 April 2011 - 06:55 AM

Carlos.

Very nice sketch. Beautiful. Tell me. Its what you see in your scope ??? Gee, your seeing conditions are remarkable as I still didn`t see the cassidi division yet in my C14 !!! To date, none of Mercury, Venus, Jupiter and Saturn gave me a real satisfaction.

Andre.


Hi Andre,

Perhaps you want to invest in a Lyman Cooler [spelling?]. Apparently it makes equalizing the temperature of the optics a lot quicker than normal. Fourteen inches is a lot of glass to cool without a fan [or heat]. I'll make you an internet bet your not seeing Cassinis is partialy due to your scope not fully equalizing. South Florida where Carlos observes from is known for very very good seeing - and often - so I'm told. In Connecticut anyway, it can take some patience. Im hedging on your cooling of the cat affecting your cassini views.

Pete

#18 CarlosEH

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Posted 23 April 2011 - 12:30 PM

Andre,

I agree with Pete that a Lyman Cooler may help resolve any thermal issues that your C14 may have (considering the location you are observing from). We are also assuming that your C14 has diffraction-limited optics and is collimated. The collimation of such a large aperture cannot be stressed enough. The slightest misalignment will prevent you from seeing detail over most objects. The best of luck in your future observations.

Carlos

#19 niteskystargazer

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Posted 26 April 2011 - 09:57 AM

Carlos,

Very nice sketches of Saturn :).

CS,KLU,

:thanx:,

Tom






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