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Saturn Observation (April 15, 2011)

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#1 CarlosEH

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Posted 16 April 2011 - 02:21 AM

I made an observation of Saturn on April 15, 2011 using my 9-inch (23-cm) F/13.5 Maksutov-Cassegrain. The North Tropical Zone (NTrZ) storm has dissipated in intensity, at least for the longitude visible. The rings also showed variations on color/hue. I welcome any comments on my observations.

Date (U.T.): April 15, 2011
Time (U.T.): 05:30
L1 159.6*, L2 107.0*, L3 109.9*
De 8.3*, Ds 9.1*, 0.4m, 19.2" (Equatorial)
Instrument: 9-inch (23-cm) F/13.5 Maksutov-Cassegrain
Magnification: 155x, 310x, and 388x
Filters: None (IL)
Seeing (1-10): 7, Antoniadi (I-V): II
Transparency (1-6): 4-5

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, shaded to bright (6-7/10), and irregular.
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 dark golden-yellow color. The inner half appears shaded (6/10) and light pastel yellow 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.

A digital image produced in Pixelmator.

Carlos

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#2 CarlosEH

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Posted 16 April 2011 - 02:26 AM

A wide field observation of Saturn and six of it's satellites. The satellites visible were Tethys (10.3m), Enceladus (11.8m), Dione (10.5m), Rhea (9.8m), Iapetus (11.2m) and Titan (8.4m), preceding to following.

A digital image produced in Pixelmator.

Carlos

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#3 CarlosEH

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Posted 16 April 2011 - 02:33 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 Belt (NTB) appears thin and dusky (4/10). The North Tropical Zone (NTrZ) storm appears diminished in intensity over the longitudes observed. 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 CarlosEH

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Posted 16 April 2011 - 02:43 AM

Comparison views of the preceding and following ansae of Saturn's rings. The outer half of Ring A (A) appears dusky (4/10) with a dark golden-yellow color whereas the inner half appears shaded (6/10) and a light pastel yellow color. The Cassini Division is visible and appears very dark (8/10). The outer half of Ring B (B) appears bright (7/10) with dusky (4/10) streaks noted over the inner half. The Crepe © Ring appears dusky (4/10) and translucent.

A digital image produced in Pixelmator.

Carlos

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#5 oracleman

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Posted 16 April 2011 - 03:58 AM

Simply....Wooooaaaaaaa!!!! Awesome sketchs!!!!

#6 Sol Robbins

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Posted 16 April 2011 - 07:27 AM

Carlos,

Excellent suite of sketches.

#7 chrisrnuttall

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Posted 16 April 2011 - 08:07 AM

Carlos

I really like that.
I am not usually a huge fan of digital sketching - I guess I am just a boring traditionalist, I realise the medium is incredibly powerful and enables the artist to edit and re-edit until they are perfectly happy, but I just prefer the connection I feel when I look at something drawn on paper, with pencils.
However you manage to maintain a feeling of something which has been 'hand-made', ie it is not too regular and not too perfectly smooth, yet you exploit the strengths of the digital medium very well. The result is highly detailed, very well coloured, quite realistic, and also very pleasing to the eye.

#8 CarlosEH

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Posted 16 April 2011 - 03:44 PM

Thank you all for the compliments on my latest set of Saturn observations. I was fortunate to have experienced steady seeing for my observing session. I hope that you all experience good seeing for your own observations of Saturn.

Chris- I too enjoy making observations of the Moon and planets using traditional media (e.g. graphite, watercolor, pastel, etc.) as you do. I resisted in making digital renderings of the moon and planets for a long time. I then discovered the potential for digital sketching, as you point out it is very powerful, not too long ago. My goal in making my observations is to produce the most accurate rendering of what is visible to my eyes in the eyepiece field. I find that digital media (e.g. Photoshop and graphics tablet) allows me to accurately portray what I see. I am not trying to compete with a CCD image as I feel that visual observation captures delicate features visible more accurately (not an attack on CCD imaging as I have the greatest respect for the art/science). I enjoy reviewing all of the excellent observations posted on this forum made using traditional media, such as your fine observations. The bottom line is that the observer/artist must use whatever media is comfortable to use from their perspective.

The best of luck in your own observations of Saturn.

Carlos

#9 geminijk

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Posted 16 April 2011 - 04:38 PM

Simply :bigshock: and the details are :jawdrop:

John

#10 Rutilus

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Posted 16 April 2011 - 05:02 PM

Carlos - Excellent work indeed.

#11 Bill Possel

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Posted 16 April 2011 - 05:31 PM

Carlos - beautiful and inspiring work!

Bill

#12 CarlosEH

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Posted 16 April 2011 - 07:02 PM

Bill, John, and Rutilus

Thank you all for the kind compliments on my latest observations of Saturn. My observations are only as attractive as the subject. I always enjoy viewing the ringed planet. The best of luck in your own observations.

Carlos

#13 frank5817

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Posted 16 April 2011 - 09:19 PM

Carlos,

Very impressive sketches of Saturn and its Moons.
The color in the A and B rings are subtle but clearly seen in these sketches.
Always a pleasure to see these remarkable sketches of Saturn by your talented hand.

Frank :)

#14 mikesemmler

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Posted 16 April 2011 - 11:27 PM

carlos

you are the Lord of the rings :bow: :bow: :bow: :bow:

michael

#15 chrisrnuttall

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Posted 17 April 2011 - 08:01 AM

Carlos

I agree, I think that with digital sketching it is possible to produce a more accurate record of an observation than through traditional techniques, and yours are the best I have seen by a long way. But there's just something about drawings made on paper, in the traditional manner which I find so engaging, you can feel more of a connection with them. Do you know what I mean?

#16 CarlosEH

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Posted 18 April 2011 - 02:25 AM

Frank and Michael,

Thank you both for your kind compliments on my latest Saturn observations. The colors noted over Saturn are subtle (much more so than Jupiter). This has to do with the fact that a high atmospheric haze exists over Saturn at all times (except when a storm disrupts it like the recent NTrZ storm). The Saturnian atmosphere typically presents delicate pastel yellow/brown/blue/green hues, usually depending upon the latitude.

Chris- I do understand the attraction of the traditional method of recording observations on paper using various media. I miss it and will hopefully post an "old school" observation as soon as possible. I look forward to everyone's classic and contemporary observations.

The best of luck in your own observations.

Carlos

#17 Jef De Wit

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Posted 18 April 2011 - 11:34 AM

Carlos, your sketches are always impressive. This one is no exception!

#18 Tommy5

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Posted 18 April 2011 - 10:07 PM

Another outstanding sketch, great job Carlos.

#19 CarlosEH

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Posted 20 April 2011 - 12:09 AM

Jef and Tommy,

Thank you for the compliments on my Saturn observations. The best of luck in your own observations of the ringed planet.

Carlos






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