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Astrophotography and Sketching >> Sketching

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CarlosEH
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Re: 07.03.07 Venus Sketch new [Re: Sol Robbins]
      #1697457 - 07/03/07 12:29 PM

Sol,

Another excellent observation of the goddess of love. You have rendered the delicate albedo features very nicely. Thanks you for sharing it with us all.

Carlos

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Sol Robbins
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Re: 07.03.07 Venus Sketch new [Re: CarlosEH]
      #1697615 - 07/03/07 01:53 PM

Thanks Carlos.

I have to admit this has been a really interesting Venus apparition. About 10 days ago Venus showed its blurred albedo features in my 3" refractor at the Rockland Astronmy Club's last public night.

Many thanks to all who contributed their Venus observations to this thread.

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S.R.


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frank5817
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Re: 07.03.07 Venus Sketch new [Re: Sol Robbins]
      #1697969 - 07/03/07 04:53 PM

Sol,

Another great Venus sketch indeed. You really pull out a lot of variability in brightness in the albedo features.

Frank

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Tommy5
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Re: 07.03.07 Venus Sketch new [Re: frank5817]
      #1698096 - 07/03/07 06:01 PM

Great sketch, it's interesting that the red filter now brings out the albedo features.

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Sol Robbins
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Re: 07.03.07 Venus Sketch new [Re: Tommy5]
      #1698432 - 07/03/07 09:48 PM

Thanks Frank & T5.

I was going to try for 3 sketches in IL, deep red and deep violet. I simply didn't have enough time as Venus disappeared behind some trees.

Best,

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


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Special Ed
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Re: 07.03.07 Venus Sketch new [Re: Sol Robbins]
      #1698579 - 07/03/07 11:04 PM

Nice one, Sol. The crescent phase and cusp extensions rendered by you and Frank compare well to the image posted by Kruno in the Venus thread in the SSO forum.

I hope to observe Venus myself while I am at the Green Bank Star Quest the next four days. If I have any luck with the weather, I'll post the results here.

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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
50mm f/10 Galileoscope
40mm PST f/10
APM Germany HD 15x70 binoculars
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Special Ed
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Re: 07.07.07 Venus Sketch new [Re: Special Ed]
      #1708881 - 07/10/07 06:00 AM Attachment (82 downloads)

Quote:


I hope to observe Venus myself while I am at the Green Bank Star Quest the next four days. If I have any luck with the weather, I'll post the results here.




Well, I'm quoting myself here because I just got back from the StarQuest and I was able to observe Venus. Meanwhile, it appears everyone here has been very busy--I have a lot of catching up to do in order to see everyone's work.

With the help of a friend's sharp eyesight, I put the scope on Venus around 8PM EDT and was able to observe it for over an hour. Since my last observation on June 19th, Venus's apparent angular size has grown from 27 arcseconds to 34 arcseconds and the "horns" are very prominent.

The sketch was done in the field using HB and 2B pencils, black ink, and a stump. Once again, I did the sketch from an intensity diagram. As Sol mentioned, Venus goes down fast now--faster than I can work. The view with the blue and red filters was very similiar.

I didn't think I'd still be sketching Venus in July, but here it is.

Attachment

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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
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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frank5817
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Re: 07.07.07 Venus Sketch new [Re: Special Ed]
      #1709030 - 07/10/07 08:43 AM

Michael,

Wonderful Venus sketch. I got a brief look at it a few days back. You captured the darkening along the terminator beautifully.

Frank

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Tommy5
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Re: 07.07.07 Venus Sketch new [Re: frank5817]
      #1709820 - 07/10/07 05:19 PM

Great sketch, it looks like we will be able to capture markings on venus this late in the season.

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Special Ed
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Re: 07.07.07 Venus Sketch new [Re: Tommy5]
      #1710009 - 07/10/07 06:52 PM

Frank, T5, thanks! The shading along the terminator was *very* prominent even in integrated light. It will be interesting to see what remains visible as Venus progresses more into the crescent phase. I hope you both get to observe and sketch beautiful Venus again.

Best,

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

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: 07.07.07 Venus Sketch new [Re: Special Ed]
      #1710455 - 07/10/07 11:08 PM

Michael,

Great Venus sketch!

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


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Special Ed
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Re: 07.07.07 Venus Sketch new [Re: Sol Robbins]
      #1711212 - 07/11/07 12:09 PM

Thanks, Sol.

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

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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Tommy5
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Re: 07.07.07 Venus Sketch new [Re: Special Ed]
      #1712550 - 07/11/07 11:09 PM Attachment (89 downloads)

Micheal here is a snapshot of venus taken 7-11-07 the day of greatest brightness,with a red 23a filter,some darker areas were visible near the terminator and very subtle shading appeared further across venusian cloudscape.

Attachment

Edited by Tommy5 (07/11/07 11:10 PM)


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frank5817
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Re: 07.07.07 Venus Sketch new [Re: Tommy5]
      #1747074 - 07/30/07 01:15 AM Attachment (88 downloads)

This is a midday observation of Venus before it crossed the meridian. Sky transparency was good 4.5/5 seeing poor 4/10. I tried an assortment of filters with a pair of polarizing filters giving the best view.

Equipment
10" f/5.7 Dobsonian with a 9mm ortho. eyepiece (161x)
Polarizing filter pair
Seeing: Pickering 4/10
Transparency 4.5/5
Time:7:10-7:30 UT 7-29-2007
Sketching:
9"x9" black Strathmore Artagain paper background. White sketching paper cut to the shape of the Venus phase.
2H and HB graphite pencils blended with a blending stump.

Frank McCabe

Attachment

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My Gallery


Edited by frank5817 (07/30/07 01:18 AM)


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Tommy5
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Re: 07.07.07 Venus Sketch new [Re: frank5817]
      #1748369 - 07/30/07 06:34 PM

Great sketch of venus, good idea catching it in the afternoon, i'll try to catch it after sunset, it is getting very low,nice shading at the terminator, this is the best venus season i have ever had thanks to you guys at cn.

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Special Ed
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Re: 07.07.07 Venus Sketch new [Re: Tommy5]
      #1751033 - 08/01/07 07:34 AM

Frank,

Nice sketch--the crescent of Venus must come close to filling the eyepiece by now, but it looks like all those cloudtop albedo features we were seeing earlier are hard to make out now. I wonder how much of the duskiness at the terminator is a contrast effect.

Tommy,

I agree--the best Venus apparition by far for me, too.

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

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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CarlosEH
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Reged: 01/19/05
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Re: 07.07.07 Venus Sketch new [Re: Special Ed]
      #1753009 - 08/02/07 04:50 AM

Frank, Michael, and Tommy

Thank you all for your excellent observation and image of Venus. Michael's observation shows albedo features across the venusian disk. Faint albedo features are visible in Franks' observation. Tommy's image shows albedo features towards the terminator. Keep up the good work!

Carlos

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frank5817
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Re: 07.07.07 Venus Sketch new [Re: CarlosEH]
      #1761475 - 08/06/07 01:32 PM

Tommy, Michael and Carlos,

Thanks for your comments. I was really struggling to see any kind of albedo features with this thin crescent. The daytime atmosphere was very turbulent and the sun was cooking my scope.
Frank

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janehoustonjones
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Reged: 10/21/07
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Re: 07.07.07 Venus Sketch new [Re: Special Ed]
      #2869357 - 01/16/09 04:20 PM

Hi Michael, thanks for allowing me to use your Venus Sketch in my NASA What's Up podcast this month (January 2009). Here it is: http://www.jpl.nasa.gov/video/index.cfm?id=798 Your sketch is about 1 minute 36 seconds in from the beginning. :-)

For February I am again looking for sketches that match Galileo's lunar sketches. Not high magnification, but low power small telescope sketches like those sketch 400 years ago. :-) Jane

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Jane Houston Jones
Monrovia, CA

Blog: "Twas the Night Before Solstice
NASA's What's Up December 2012 podcast Winter skies, Geminids
Yosemite Nature Notes "Night Skies video"















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HellsKitchen
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Re: 07.07.07 Venus Sketch new [Re: janehoustonjones]
      #2870226 - 01/17/09 12:30 AM

Awesome sketches fellas! I'll have to set up my scope a little earlier next time and attempt a daylight obs of Venus.

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S 38 00' E 14520'

12" F/4.4 SDM/Zambuto truss dob
8" F/6 dob




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