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Mars 22nd March in 100mm 28th March in 254mm cass.

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#1 stanislas-jean

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Posted 30 March 2014 - 12:01 PM

Here are some observations performed with the 100mm refactor and in the 254mm cassegrain.
The seeing did his job for reducing the difference.
Image 10/10 the best.
Stanislas-Jean

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#2 stanislas-jean

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Posted 30 March 2014 - 12:02 PM

the 254 cass.

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#3 niteskystargazer

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Posted 30 March 2014 - 07:37 PM

Stanislas-Jean,

Nice sketches of Mars Mar. 22nd in 100mm and Mars on Mar. 28th in 254mm Cass :).

CS,KLU,

:thanx:,

Tom

#4 CarlosEH

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Posted 30 March 2014 - 09:22 PM

Stanislas,

Excellent observations of Mars showing interesting detail between the Tharsis region to Elysium. Thank you for sharing them with us all.

Regards,
Carlos

#5 Uwe Pilz

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Posted 30 March 2014 - 11:37 PM

Interesting details can be seen at your sketches. Thank you.

#6 stanislas-jean

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Posted 31 March 2014 - 12:43 AM

Thanks for your witness.
It is amazing to catch half tone contrasted features on this side. The cassegrain could allow to see deeper the boundaries of Chaos for example appearing in seeing holes as lines as dots linked between by less dark bridges.
It is needed more steady momments for defining them acurately.
The site here is too average for making better, the optimum aperture size remain 4" only, may be 6". The images were only 6/10 at the best in the 4", 10/10 the best.
Stanislas-Jean

#7 Tommy5

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Posted 31 March 2014 - 07:55 PM

very nice sketches good detail. Thanks for posting.

#8 rolandlinda3

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Posted 31 March 2014 - 09:43 PM

For an "average" site, these sure look good to me. Much better than I can do.

#9 stanislas-jean

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Posted 01 April 2014 - 12:57 AM

Matter of seeing quotation.
5-6/10 represents what is seen on a star highly magnified, airy disk 1st ring, mostly. There are holes on this general figure, but here, momments of steadiness were very short, say less than the 1 sec. time.
Stanislas-Jean

#10 Kris.

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Posted 01 April 2014 - 03:01 AM

Nice sketches, with lots of low contrast features!

#11 Tamas Bognar

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Posted 02 April 2014 - 12:26 AM

Fine sketches of Mars.

Thanks for sharing!

#12 stanislas-jean

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Posted 02 April 2014 - 12:50 AM

Thanks Kris and Tamas.
I did some observations yesterday with the 100mm refractor using the RG435 filter (150-190x). Features were strongly deemer sothat when at the 22nd March with so defined details in blue channal, we may think to blue-clearing event on the 22nd last.
There is no enough data from my side for a firm conclusion but some others may have.
Please bring them here.
Stanislas-Jean

#13 stanislas-jean

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Posted 02 April 2014 - 01:10 PM

Here is the report performed last 1st April performed with the 100mm refractor achromat.
Brightenings at limbs.
Brightenings quotations in different channel colors.
In blue channel the contrast levels are substantially deemer than on last 22nd.
Blue clearing on the 22nd period (no enough personal data to confirm this)possible.
Stanislas

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#14 Jeff B1

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Posted 02 April 2014 - 01:44 PM

Very nice drawings. I may start doing it in a few days myself, if the spirit moves me :).

#15 niteskystargazer

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Posted 02 April 2014 - 02:11 PM

Stanislas,

Nice sketches of Apr. 1 of Mars :)

CS,KLU,

:thanx:,

Tom

#16 stanislas-jean

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Posted 04 April 2014 - 01:29 AM

Thanks a lot.
The 1st April sketches show the fact that views in IL are not enough.
Brightness of the clouds noted in IL has different responses versus the color channel.
Blue clearing remains also on interrest with some variations it seems. The RG435 filter is well centered for visual observations in these views. But some complementary data with W47 or near UV filters are also needed for a comparison (too dark in a 100mm, begins OK in a 250mm).
Still the double check acquisition for confirming data by ourselves.
Stanislas-Jean

#17 Aquarellia

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Posted 07 April 2014 - 11:56 PM

What a good work! Mars is my prefered target at the moment.
Thank you for sharing your technique, impressions and sketch with us.

#18 stanislas-jean

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Posted 08 April 2014 - 01:50 AM

Thanks for your post.
I transferres the subject to "Solar system observing":
Mars last 6th: mist rather than white clouds?
regarding the nature of the clouds observed.
Stanislas-Jean

#19 CarlosEH

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Posted 08 April 2014 - 02:19 AM

Stanislas,

Another excellent set of Mars observations in blue light showing interesting clouds over the limbs. Thank you for sharing them with us all.

Regards,
Carlos

#20 Erik Bakker

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Posted 10 April 2014 - 09:32 AM

Very nice sketches of Mars. Good small optics and an experience observer combine well on this planet!

#21 stanislas-jean

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Posted 11 April 2014 - 12:37 AM

Thanks a lot.
The observations interest here are the fact that the brightnings are also bright in deep yellow and above, which is something bringing more for this definition of white clouds. But mixed with something else which deviate their reflectivity.
Stanislas-Jean






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