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Special Ed
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Reged: 05/18/03
Posts: 6339
Loc: Greenbrier Co., WV 38N, 80W
Re: Venus 05.04.07 through 05.16.07 new [Re: Sol Robbins]
      #1612471 - 05/18/07 07:13 PM

Frank, Eric--two astonishingly good sketches. To my eye, Frank's appears like an eyepiece view and Eric's approaches the best imaging we see in the Imaging Forum.

I especially like the diffuse appearance of the terminator edge in Eric's drawing. How did you do that drawing, please?

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Michael Rosolina
Celestron CGE Pro 1400 f/11 SCT
1980 Orange Tube C8 f/10 SCT
4.25" f/4.2 Astroscan Reflector
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frank5817
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Re: Venus 05.04.07 through 05.16.07 new [Re: Special Ed]
      #1612542 - 05/18/07 08:03 PM

Thank you gentlemen,
I would like to hire Eric to do my sketching.
Frank

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Tommy5
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Reged: 03/28/04
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Re: Venus 05.04.07 through 05.16.07 new [Re: frank5817]
      #1613587 - 05/19/07 02:30 PM

Great sketches frank,eric and micheal,they all look very much like my view through my scope,its great to see such a display of sketching talent on our sister planet.

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rolandlinda3
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Reged: 01/24/06
Posts: 3140
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Re: Venus 05.04.07 new [Re: CarlosEH]
      #1616177 - 05/20/07 10:53 PM

Great sketches and I appreciate and learned a bunch from the posts. My venus experience has been pretty dismal, but the comments tell me it is do-able. Thanks.

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Roland
Blog: www.rolandlinda3.wordpress.com
Older sketches in Members Galleries (rolandlinda3)
For other sketches/inspirational stories: contact me via PM for information


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cildarithModerator
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Re: Venus 05.04.07 new [Re: rolandlinda3]
      #1616968 - 05/21/07 11:40 AM

Thanks for your comments, gentlemen!

To Michael: my sketch of Venus begins with a simple circle template. I do not attempt to "pre-position" the terminator as I've learned that apparent phase of Venus does not always precisely match the theoretical one (the phase usually appears a little bit smaller than it ought to) - so the first step is to estimate the position of the terminator and draw that in.

The unilluminated portion of the disk is then blackened in with pencil and a blending stump is used to "bleed" some of the graphite into the terminator region to give it that dusky, ill-defined look we are all familiar with. Once that is done I begin looking for those subtle variations in brightness across the cloudtops. These are added with the blending stump, dipping it into the blackened area (if necessary) and lightly shading in any apparent features.

Once the sketch has been scanned I apply a light blur to the whole image to further soften the blending stump and pencil strokes and crop a black circle around the disk to return the limb to its original sharpness. Finally I airbrush out any trace of pencil markings in the darkened region beyond the terminator.

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Eric
6" f/6 Parks Newtonian
10x50 Bushnell Binocs


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Sol Robbins
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Reged: 12/01/03
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Another Venus 5.22.07 new [Re: cildarith]
      #1618385 - 05/22/07 01:15 AM Attachment (118 downloads)

I had very good conditions for this Venus observation. Got to use 397x and a Wratten 47 deep violet with my slightly stopped down 10" reflector.

This sketch has a 2 step grayscale. I used 4H pencil to lay down a base tone which was blended with my fingers. The darker gray was done with an HB and slightly blended with my fingers. Then the whites were erased out.

Best,

Attachment

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S.R.


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frank5817
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Re: Another Venus 5.22.07 new [Re: Sol Robbins]
      #1618505 - 05/22/07 04:27 AM

Sol,
Great sketch. I took a close look at Venus tonight but sky conditions were poor near and just after sunset.
Frank

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Dee
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Reged: 03/12/06
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Re: Another Venus 5.22.07 new [Re: frank5817]
      #1618542 - 05/22/07 05:41 AM

What a excellent observation and rendition of this very very bright but difficult to do Planet

Dee


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Sol Robbins
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Re: Another Venus 5.22.07 new [Re: Dee]
      #1618590 - 05/22/07 06:46 AM

Frank & Dee,

Thanks for the compliments.

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S.R.


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Special Ed
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Reged: 05/18/03
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Re: Another Venus 5.22.07 new [Re: Sol Robbins]
      #1622285 - 05/23/07 09:55 PM

Sol,
Excellent and impressive rendering of the Venusian cloudtops that you captured with your combination of scope/filter/seeing/eye.

Eric,
Thanks for the info on your technique. I hope you post another Venus observation.

I took a look at Venus last Saturday night while participating in the first International Sidewalk Astronomy Night. I first tried my new #47 filter (during early twilight) and boy did that make the view dark! With the public starting to show up, I didn't have the time or solitude to study the view carefully but I knew it was too dark for the casual observer so I put in the 80A. When asked, several people noticed the albedo features in the cloudtops and the bright limb arc. I never got a chance to sketch that night, but it was nice to be able to show Venus to an appreciative public.

Conditions haven't allowed me to observe since that night, but I'm curious to try the #47 filter again and in slightly darler skies. It was obvious from my first brief look that, as Carlos said, 8" of aperture is at the low range for the usefullness of this filter.

--------------------

Michael Rosolina
Celestron CGE Pro 1400 f/11 SCT
1980 Orange Tube C8 f/10 SCT
4.25" f/4.2 Astroscan Reflector
50mm f/10 Galileoscope
40mm PST f/10
APM Germany HD 15x70 binoculars
Canon 12x36 IS II binoculars
Mark I Eyeball
My CN Gallery


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Sol Robbins
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Re: Another Venus 5.22.07 new [Re: Special Ed]
      #1622361 - 05/23/07 10:57 PM

Micheal,

Thanks.

I have been observing Venus while it is still light out. Roughly at 8pm eastern at this point in time. Venus is quite high in elevation and some far off trees keep me and my scope in shade. As said before, the W47 has a 2% light transmission. Until now I have never used a W47 and only in my 10" scope. It is kind of useless in my 6" refractor.

For some reason, I find observing Venus in my 10" reflector quite compelling. I am glad that this apparition is showing details even to your ISAN guests.

--------------------
S.R.


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Tommy5
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Re: Another Venus 5.22.07 new [Re: Sol Robbins]
      #1624453 - 05/25/07 12:05 AM

Great sketch it looks very realistic, the other night i had some luck seeing the albedo features with a variable polarizer filter, i didn't have time to sketch but these markings are not hard to see but hard to sketch accurately as the seeing blots them out from time to time, your sketch is very close to the way they appear except with my smaller aperture,6" they don't seem to extend as far from the terminator.

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Special Ed
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Re: Another Venus 5.22.07 new [Re: Sol Robbins]
      #1624678 - 05/25/07 06:37 AM

Quote:


I have been observing Venus while it is still light out. Roughly at 8pm eastern at this point in time. Venus is quite high in elevation and some far off trees keep me and my scope in shade. As said before, the W47 has a 2% light transmission. Until now I have never used a W47 and only in my 10" scope. It is kind of useless in my 6" refractor.




I was thinking that if the sky was a little darker, contrast would be better and Venus would appear brighter with the filter but maybe I'm wrong. Of course, the trade off for waiting is that Venus is lower in altitude. I guess the best test for this W47 filter in my 8" aperture is to start observing early and keep observing until after dark to compare what I can see with it.

Quote:


For some reason, I find observing Venus in my 10" reflector quite compelling. I am glad that this apparition is showing details even to your ISAN guests.




With Venus shining like a beacon every evening even through cloud cover, it's practically impossible to resist the urge to put a telescope on it whenever the opportunity presents itself.

--------------------

Michael Rosolina
Celestron CGE Pro 1400 f/11 SCT
1980 Orange Tube C8 f/10 SCT
4.25" f/4.2 Astroscan Reflector
50mm f/10 Galileoscope
40mm PST f/10
APM Germany HD 15x70 binoculars
Canon 12x36 IS II binoculars
Mark I Eyeball
My CN Gallery


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JoeF
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Reged: 03/18/05
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Re: Another Venus 5.22.07 new [Re: Special Ed]
      #1624721 - 05/25/07 07:47 AM Attachment (96 downloads)

I have a sketch of Venus in the Planetary and Solar System Observing forum "Venus at Dusk". One of the reasons for posting it was my surprise at the amount of (very subtle) detail that was visible even without filtration. A double stacked polarising filter did cut down the glare and make observations easier but even so it took a fair bit of concentration to be sure. Unfortunately I had no other filters to hand to experiment with.

Heres a cut down (and enhanced) copy of that sketch.

Joe

Attachment

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frank5817
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Re: Another Venus 5.22.07 new [Re: JoeF]
      #1624855 - 05/25/07 09:39 AM

Joe,
Nice sketch, the albedo features really show well.
Frank

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Tommy5
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Re: Another Venus 5.22.07 new [Re: JoeF]
      #1626631 - 05/26/07 10:53 AM

very nice and accurate sketch of the subtle wispy markings on venus keep up the good work it will interesting to see if these markings are still visible when venus moves past elongation and plunges back toward the sun.

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Sol Robbins
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Re: May 27 Venus Sketch new [Re: JoeF]
      #1627732 - 05/27/07 01:18 AM Attachment (80 downloads)

I had good conditions for yet another Venus observation. Venus is appearing lower in altitude than seen in previous observations at around 8pm local time.

Albedo features are still obvious with my 9.75" reflector with Wratten 47 deep violet filter. Sketch shows magnification at 317x. It should read 397x.

Again, this sketch was made using 4H and HB pencils with blending done with my fingers. Bright spots were erased out.

Best,

Attachment

--------------------
S.R.


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frank5817
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Re: May 27 Venus Sketch new [Re: Sol Robbins]
      #1627892 - 05/27/07 08:09 AM

Sol,
Very nice Venus sketch. It has been too cloudy to observe here for two evenings.
Frank

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Sol Robbins
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Re: May 27 Venus Sketch new [Re: frank5817]
      #1628022 - 05/27/07 09:54 AM

Thanks Frank. I look forward to seeing what your observations when the weather cooperates.

--------------------
S.R.


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Tommy5
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Re: May 27 Venus Sketch new [Re: Sol Robbins]
      #1629422 - 05/28/07 03:07 AM

Excellant view of the cloud markings on venus, very similar to what i saw this evening under steady skies in chicago,i'll post my sketch tomorrow. thanks for alerting us to these views, usually i don't even observe venus unless its in a thin crescent.

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