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Mars and uranus on last 16th

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#1 stanislas-jean

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Posted 17 September 2020 - 04:16 AM

Hi,

Here is a report of mars performed last 16th september with the 203mm cassegrain.
Average images until 22H30UT were met then becoming worst.
It was noted at the limb and at the terminator some bright area in different color channels, mostly dusty.
The planet with the naked eye without telescope looked still typically yellowish, the contrast on planet disk lowered by an overall atmospheric veil.

The observation in violet light confirmed the above.
Please refer to the sketch.

 

resized_mars 16.09.20 21H20UT.jpg

 

Now near the planet opposition date,

here is a report of uranus performed last 16th september with the 203mm cassegrain.
Good images on short moments were met becoming worst after the session (less than 4-5/10).
3 grey tones was observed as shown. Difficult to place each area at their actual locations, curvature is expected but not enough accurately expected.
Anyway, the accessible pole looked darker than the middle area, the brightest.
We will see later with the bigger scope waiting more consistent stable images.

 

resized_uranus 16.09.20 22H33UT.jpg

 

Good skies

Stanislas-Jean


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#2 Magnetic Field

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Posted 17 September 2020 - 08:50 AM

Hi,

Here is a report of mars performed last 16th september with the 203mm cassegrain.
Average images until 22H30UT were met then becoming worst.
It was noted at the limb and at the terminator some bright area in different color channels, mostly dusty.
The planet with the naked eye without telescope looked still typically yellowish, the contrast on planet disk lowered by an overall atmospheric veil.

The observation in violet light confirmed the above.
Please refer to the sketch.

 

attachicon.gifresized_mars 16.09.20 21H20UT.jpg

 

Now near the planet opposition date,

here is a report of uranus performed last 16th september with the 203mm cassegrain.
Good images on short moments were met becoming worst after the session (less than 4-5/10).
3 grey tones was observed as shown. Difficult to place each area at their actual locations, curvature is expected but not enough accurately expected.
Anyway, the accessible pole looked darker than the middle area, the brightest.
We will see later with the bigger scope waiting more consistent stable images.

 

attachicon.gifresized_uranus 16.09.20 22H33UT.jpg

 

Good skies

Stanislas-Jean

I have never seen Uranus in any telescope.

 

It is not far away from Mars on the skychart.

 

I think I will try to find my luck with my 4" Borg ED.



#3 niteskystargazer

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Posted 17 September 2020 - 10:08 AM

Stanislas-Jean,

 

Good sketches of Mars and Uranus (On last 16th) smile.gif .

 

CS,KLU,

 

thanx.gif ,

 

Tom



#4 stanislas-jean

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Posted 18 September 2020 - 05:56 AM

Thanks Tom, Siegfrid.

 

Something is moving,

In spite of the average to poor images, here is a report of mars performed last 17th with the 150mm refractor.

Comparing with the 16th report, veils on Hellas at terminator, Aeria at terminator, Sinaî-Solis Lacus seemed to extent in surface.

Brighter on the yellow channel but also clear on the green channel: rather misty, except at the limb and at the terminator the veil signatures are rather dusty.

Still white hazze on the north pole area, the violet layer still transparent.

Expect better images locally.

Good skies.

Stanislas-Jean

 

resized_mars 17.09.20 21H10UT.jpg


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#5 stanislas-jean

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Posted 19 September 2020 - 03:41 AM

Hi,

Here is a mars report performed last 18th september under average images through the 203mm cassegrain.

The plane looked still yellowish at the naked eye without scope.

The session gave data about the atmosphere status:

- Margaritifer sinus at the limb was occulted partially by a misty cloud, making it very bright close to the limb.

- Chryse close to the limb looked bright in all color channels.

- Sytis Major at Deltonon sinus was occulted by a misty veil spreading on Arabia-Aearia. Close to the terminator this veil looked very bright.

- Hellas exhibited a bright veil close to the terminator in all color channels, not covered the whole bassin.

- The limb and the terminator was misty close to these limits.

 

The contrasts of the mars features were lowered therefore.No time to insert the violet filter, clouds occurred and then stopped the session.

The north pole area was hazy whitish;No clouds, dusty, at all, the atmosphere globally is dusty misty,

the brightness of some area is enhanced by the thickness of the polluted atmosphere by the perspective at the limb and the terminator (light affected by stronger thickness of atmosphere).

 

Good skies.

Stanislas-Jean

 

resized_mars 18.9.20 21H20UT.jpg


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#6 frank5817

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Posted 19 September 2020 - 10:32 AM

Stanislas-Jean,

 

Fine sketching and reporting on Mars.

 

Frank :)



#7 Magnetic Field

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Posted 20 September 2020 - 03:32 AM

I have never seen Uranus in any telescope.

 

It is not far away from Mars on the skychart.

 

I think I will try to find my luck with my 4" Borg ED.

Let's face it: Uranus drives me crazy.

 

I spent 2 hours yesterday but couldn't find it.

 

I am quite sure I had a hundred times in my field of view without realising it (25mm eyepiece on a 4" ED refractor).

 

I need to try harder next time.



#8 stanislas-jean

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Posted 20 September 2020 - 04:56 AM

Thanks a lot Frank.

 

Easy to find uranus, Siegfrid.

Just point Algenib (Pegasus mag2 star) in your scope.

Then on your equatorial

- on RA remove 2H19min

- on Dec remove 0°43min

You will have U in the FOV, easy. The disk size is sensitive from 60x, the color bluish-light green. The planet is close to a mag 6 star (well seen at the finder even a 30mm).

Then push 250x in the 4".

Good skies

Stanislas-Jean



#9 Magnetic Field

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Posted 20 September 2020 - 08:57 AM

Thanks a lot Frank.

 

Easy to find uranus, Siegfrid.

Just point Algenib (Pegasus mag2 star) in your scope.

Then on your equatorial

- on RA remove 2H19min

- on Dec remove 0°43min

You will have U in the FOV, easy. The disk size is sensitive from 60x, the color bluish-light green. The planet is close to a mag 6 star (well seen at the finder even a 30mm).

Then push 250x in the 4".

Good skies

Stanislas-Jean

Vixen Porta II and Porta Mini.

 

No ra and dec setting circles on these alt-az mounts.

 

The problem was: the skychart showed the mag 6 star "29 Arieties" as a close companion to Uranus.

 

But then in the field I didn't see the forest for the trees and "29 Arieties" did not stand out because there were so many bright stars.

 

But as I said I saw Uranus a hundred times while not realisig it.

 

On that evening I could easily find M77.


Edited by Magnetic Field, 20 September 2020 - 08:58 AM.


#10 stanislas-jean

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Posted 20 September 2020 - 09:12 AM

Frankly, the use of a dob or an alta zimuthal on planets, you may loose 50% of the details.

My opinion and use of such.

With such, try to find an alignment of stars from one of the Pisces.

Your 100mm merits an equatorial, I have here a svp pro orion for portable sessions that helps a lot even for a C8.

Stanislas-Jean



#11 Magnetic Field

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Posted 20 September 2020 - 09:23 AM

Frankly, the use of a dob or an alta zimuthal on planets, you may loose 50% of the details.

My opinion and use of such.

With such, try to find an alignment of stars from one of the Pisces.

Your 100mm merits an equatorial, I have here a svp pro orion for portable sessions that helps a lot even for a C8.

Stanislas-Jean

I doubt the 50%.

 

One develops different skills (at least for a bog standard alt-az***) when using an alt-az mount for planets. Also 200x with a 4" refractor and a good eyepiece (edge to edge) is still manageable though a pain in the ****. A 8" telescope which often could go higher > 250x magnification it becomes more and more of a problem because of the ever decreasing field of view (a planet zips in no time through the 250x field).

 

Because if the 50% were true then something is amiss here because our Mars sketches are quite similar. This could only mean you are not seeing enough detail in your 4" and 120mm  refractor on your equatorial mount. Or alternatively your 4" and 120mm refractor is optically not good.

 

 

But an equatorial mount would make my life easier though. But for various reasons I cannot use an equatorial mount.

 

 

***Mileage may vary for a Dobsonian though which I have no experience with.


Edited by Magnetic Field, 20 September 2020 - 09:39 AM.


#12 stanislas-jean

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Posted 20 September 2020 - 09:47 AM

Dare you such?

Quotation of seeing is very important, I may have bad scopes but what is reported is obvious and verified from day to day.

This is not the apo that does the job.

The 127 apo is characterised in quality and not on feelings, achromat as well.

Cassegrain as well, commencing by interferometer then on sky.

Not feelings.

Now an equatorial remains a must with observing methods.

Stanislas-Jean



#13 Magnetic Field

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Posted 20 September 2020 - 11:23 AM

Dare you such?

Quotation of seeing is very important, I may have bad scopes but what is reported is obvious and verified from day to day.

This is not the apo that does the job.

The 127 apo is characterised in quality and not on feelings, achromat as well.

Cassegrain as well, commencing by interferometer then on sky.

Not feelings.

Now an equatorial remains a must with observing methods.

Stanislas-Jean

The problem with those rules.

 

Someone might say: A true apochromat is a strict requirement for planets.***

 

And as you say "my alt-az doesn't do the observation and it is rather the observer".

 

Also this is not science this is a hobby. I haven't seen it for the last 50 years that an amateur has contributed anything with sketching.

 

***I have also seen where someone said observing the planets with anything smaller than 8" is a waste of time and entropy.



#14 stanislas-jean

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Posted 21 September 2020 - 03:27 AM

Hi,

no matter of competition but only observations and not only a hobby.

Here is a mars report of last 20th performed under average images under a relative transparent sky and using a 100mm refractor achromatic F10.

Planet elevation only 20° above horizon.

 

Dusty-misty atmosphere was there making the planet color watched with the naked eye typically yellow.

- Margaritifer sinus was occulted by a misty veil at the limb,

- north pole area under a whitish hood,

- Hellas covered at the terminator by a dusty veil actually bright on the yellow color channel.

The overall planet looked dimer than previous days in the blue color channel except sinus sabaeus, sinus meridiani and mare serpentis well seen contrasty: probably a "hole" in the martian atmosphere.

Nothing more reported about the atmosphere activity.

With good images, it is possible to report deeper the area of interest.

Good skies.

Stanislas-Jean

 

resized_mars 20.09.20 21H10UT.jpg


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#15 stanislas-jean

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Posted 22 September 2020 - 06:35 AM

Here is a mars report performed last 21st september with the 127mm apo EDT under average to good images on short moments.

 

The atmosphere remains active and allows to highlight the following:

At limb, a misty, rather dusty, veil standed on Margaritifer sinus and on Sinus Meridaini that was almost occulted by the veil density.

On Chryse, Xanthe the veil looked very bright rose ocre color.

This status standed over the blue channel until the deep yellow channel, the more active about density.

This veil was surprisingly of great extent, occulting the said features until 22H40UT which merged after.

At terminator, on Lybia side a bright veil standed, all color channels, the more active on the yellow, occulting half of the Syrtis Major formation.

A veil was observed on the Hellas bassin being more affected on the yellow channel.

The north pole area was still covered by a whitish hood.

The south cap now becomes very tiny.

A tentative capture of the disk color is enclosed, the mars planet looks in sky typically yellow color.

I will see this evening what is moving, hope with a better seeing.

Good skies.

Stanislas-Jean

 

resized_mars 21.09.20 21H05UT.jpg


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#16 stanislas-jean

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Posted 22 September 2020 - 05:07 PM

Here is a mars report performed with only a 50mm refractor F12 under almost fixed images and a relative transparent sky.

The main features appeared very clearly, argyre bright, hellas clear, syrtis major, sinus sabaeus and sinus meridiani appeared contrasty.

Margaritifer sinus was still occulted by a consistent hazze standing at the limb.

Polar hood at the north, the Lybia area looked bright also on the terminator.

In spite of its tenuous size the south cap was there and well resolved as a white dot, stellar appearance, a light hood close to the south cap was accessible.

The session was stopped by the clouds coverage, I didn't had enough time for the filter color analysis of the veils in presence.

For the fun, the ability of small guns and for the biggest scopes users.

 

Good nights.

Stanislas-Jean

 

resized_mars 22.09.20 21H05UT.jpg


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#17 stanislas-jean

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Posted 26 September 2020 - 03:33 AM

HI,

Here is a mars report performed on last 25th under an exceptionally transparent sky but with poor to just average images on short moments.

Stars at the zenith looked planetary.

They were also affected sensitively in the 50mm refractor using 100x.

 

In spite of such, some observations getting data were conducted:

- tiny cap surrounded by a dark collar,

- a bright hazze at the limb, occulting the sinus meridiani, margaritifer sinus close to pandora

- spreading from south to north hemispheres.It appeared bright in all color channels, but more on the blue channel.

- hood light around the south cap,

- hood on the northern area, brightest in the blue channel, confirmed in the violet channel.The main features in the violet segment looked faintly: syrtis major, sinus sabaeus, pandora, syria minor.

 

Hope we will have better images for going deeper.

Good skies

Stanislas Jean

 

resized_mars 25.09.20 21H25UT.jpg


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#18 Marvin452

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Posted 26 September 2020 - 04:45 AM

Stanislas Jean,

Very detailed reporting.

 

If there is one thing I'm learning form everyone on this thread - it is that an observer needs to take time and and study the object in the eyepiece, not just glimpse it and move on to another target.

 

Trent



#19 stanislas-jean

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Posted 26 September 2020 - 09:00 AM

Hi Marvin,

Indeed making drawings needs great attention.

Be seated, patient and get the proportion.scaling of a feature takes a minimum of time.

Here on the 25th even in the 2" refractor, images were agitated (the edge of the disk magnified 100 times was shaking).

Not a good situation for starting, but with time being, it may be possible to catch some subtil details that are writen on a paper as a puzzle.

The overall pattern must be put in place first, then cloth the pattern with subtil details, verify the connections between, grey scale too. When achieved verify the overall trueness of your drawing against last watch at the eyepiece.

It takes time in regards to the seeing on the moment.

After years of visual practice you could be surprised by the overall results got by yourself.

We may commence by the color of the disk and the color of the planet in sky, yellow on the date.

When consulting the data collected, surprisingly, the whitish hazze at limb and terminator was proheminent.

Not typically white hazze, misty hazze (mix of white hazze and dust). Reason why of the color filter use for determination of the kind of veil in cause.

Now when a veil is reported bluish, this is strange when such is got bright on the yellow segment.

This needs in fact more investigation and then the color perceptibility visually cannot be enough for a straightforward conclusion.

Especially when big apertures are in use, some colors may be enhanced visually more than the others, by the scope design and the observer ability.

The other explanation could be dusty veils near the ground, white hazze above them.

The knowledge of the ground features and their contrast level are of the prime importance for a such conclusion.

Be aware of the photo issued, mostly difficult to read.

Stanislas-Jean



#20 frank5817

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Posted 26 September 2020 - 09:58 AM

Stanislas Jean,

 

Excellent sketching and great comparisons with different filters.

 

Frank :)



#21 stanislas-jean

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Posted 27 September 2020 - 05:28 AM

Thanks a lot again Frank for your kind words, gents also for their likes.

Good skies.

Stanislas-Jean



#22 stanislas-jean

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Posted 02 October 2020 - 02:21 PM

HI,

Here is a mars report performed last 2nd october with the 203mm cassegrain with average good images on moments but under an average sky transparency.

A comparison is given with the 50mm refractor for the anecdote.

 

Hazzy at the limb and the limb, Syrtis major is well occulted by a dusty misty veil commencing on Hellas bassin, Mare Cimmerium occulted at the terminator by a white hazze misty.

Chaos appeared clear with some contour, the north pôle area remained whitish hazzy.

It was not possible to watch the planet using the violet filter due to the lack of sky transparency.

Hope we get here a more stable atmosphere and colder temperatures.

Good skies

Stanislas-Jean

 

resized_mars 02.10.20 20H53UT.jpg


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#23 niteskystargazer

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Posted 03 October 2020 - 11:39 AM

Stanislas-Jean,

 

Nice sketches of Mars smile.gif .

 

CS.KLU,

 

thanx.gif ,

 

Tom




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