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Astrophotography and Sketching >> Sketching

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mikesemmler
sage


Reged: 06/01/09

Re: Daytime Mars: March 26, 2010; 23:50 UT new [Re: frank5817]
      #3711934 - 03/29/10 05:28 AM

frank - thanks for the info, I will try your tips soon

Michael


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niteskystargazer
Carpal Tunnel
*****

Reged: 10/05/09

Loc: 41-43'-28" N 87-42'-39" W
Re: Daytime Mars: March 26, 2010; 23:50 UT new [Re: frank5817]
      #3712413 - 03/29/10 12:06 PM

Frank,

nice sketch, in the day light, You have to know where Mars is. .

,

Tom


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frank5817
Postmaster
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Reged: 06/13/06

Loc: Illinois
Re: Daytime Mars: March 26, 2010; 23:50 UT new [Re: niteskystargazer]
      #3713613 - 03/29/10 09:48 PM

Tom,

Thanks,
I hope your getting in some observing on clear nights.

Frank


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frank5817
Postmaster
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Reged: 06/13/06

Loc: Illinois
Re: Daytime Mars: March 26, 2010; 23:50 UT new [Re: frank5817]
      #3718065 - 04/01/10 02:24 AM Attachment (36 downloads)

I began observing Mars about 2 hours before sunset (5pm local daylight savings time). The view was pretty good but I could not begin sketching until after sunset because of the high winds. During the daylight, observing Mars was easy because it was in the darkest part of the sky through the single polarizing filter.

Sketching:

The eyepiece sketch is the one on top in graphite pencil. The second color sketch was made indoors.
White sketching paper 8" x 11"; HB graphite pencil, blending stumps for blending orange, brown and yellow Crayola pencil shavings.
Date 3/31/2010 Time 7:45-8:25 CDT
Telescope: 10 inch f/5.7 Dobsonian and 4mm eyepiece 362 x, polarizing filter
Temperature: 21C (70F)
partly cloudy, very windy, dry air conditions
Transparency 3/5
Seeing: Average-Above average 3/5

Frank McCabe


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frank5817
Postmaster
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Reged: 06/13/06

Loc: Illinois
Re: Daytime Mars: March 26, 2010; 23:50 UT new [Re: frank5817]
      #3718078 - 04/01/10 02:51 AM Attachment (36 downloads)

I took these two images of the sky before beginning my Mars observing session as an example of how well the single polarizing filter can darken the daytime sky. The first image without the filter sheet and the second with the polarizing filter in front of the camera.

Frank


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frank5817
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Reged: 06/13/06

Loc: Illinois
Re: Daytime Mars: March 26, 2010; 23:50 UT new [Re: frank5817]
      #3718079 - 04/01/10 02:57 AM Attachment (32 downloads)

The next two images were taken with the polarizing filter oriented to block the maximum light scatter at an angle of 90 degrees from the sun's position and the second at about 150 degrees from the sun. When the planets are in this dark 90 degree zone they can be easy to locate. Mars is there now.

Frank


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Special Ed
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Reged: 05/18/03

Loc: Greenbrier Co., WV 38N, 80W
Re: Daytime Mars: March 26, 2010; 23:50 UT new [Re: frank5817]
      #3718216 - 04/01/10 07:50 AM

Nice work, Frank. It looks like M Cimmerium across the south with a hint of Syrtis Major on the following limb. Pretty bright limb arc on the p limb, too. You must have seen quite a bit of Mars rotate by.

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frank5817
Postmaster
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Reged: 06/13/06

Loc: Illinois
Re: Daytime Mars: March 26, 2010; 23:50 UT new [Re: Special Ed]
      #3719948 - 04/02/10 12:02 AM

Michael,

I was getting a view similar to the view of 6 days earlier.
M Cimmerium, the north polar cap, Lemuria and some darkening around Elysium. It would have been easier to render if I didn't need to wait out the gusts.
When it gets down below 8" it will be over for me.
Thank you.

Frank


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