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Uranus on 8th nov. and 21st october: variability

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17 replies to this topic

#1 stanislas-jean

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Posted 09 November 2019 - 05:09 AM

Here is a report of uranus performed last 8th november with the CC154 F12 Under average good images and 324x magnification.

Heavy moisture on the night with a moonlight a little interfering during the session.

Anyway, still a relative dark pôle, the clear band zone near/close to the equator was full relative brighter.

This report can be compared with the 21st october report where this clear band was only a segment (CM214° to CM169°).

Nothing more with regards to the means in use and the sky conditions.

Have good read of the present post

Faithfully, Stanislas-Jean.

 

resized_uranus 8.11.19 22H25UT.jpg

 

resized_uranus 21.10.19 21H15UT.jpg


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#2 Astroman007

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Posted 09 November 2019 - 09:48 AM

Very nice and detailed sketches and reports, S-J. Thank you for sharing them with us. smile.gif



#3 niteskystargazer

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Posted 09 November 2019 - 10:42 AM

 Stanislas-Jean,

 

Nice sketches of Uranus on 8th Nov. and 21st October: variability smile.gif .

 

CS,KLU,

 

thanx.gif ,

 

Tom



#4 frank5817

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Posted 09 November 2019 - 12:15 PM

Stanislas-Jean,

 

Always impressive to see your sketches of Uranus.

Vey nice.

 

Frank :)



#5 stanislas-jean

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Posted 10 November 2019 - 06:44 AM

Thanks Martin, Tom, Frank, for your kind words, gents for their likes too.

Also happy to see Chrisnutall at the same date and time reporting the same uranian pattern and the dark pôle (a forum here above).

Not easy to approach uranus on the period having clear skies but with so tremedous seeing.

The 1st year we have so poor conditions here.

Was a little Lucky for these 2 nights of relative stable images into a 150mm only.

Good skies to all.

Stanislas-Jean



#6 Aquarellia

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Posted 11 November 2019 - 05:11 AM

As other here I'm really impressed to see your work Stanislas-Jean !

Thank you for the interesting comparison. 

Bravo again !

Michel



#7 stanislas-jean

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Posted 12 November 2019 - 05:48 AM

Thanks a lot Michel for your words.

Should be interresting to follow such but weather is not cooperating.

Foracast weather for winter here is not good being stated heavy rainy and cloudy mostly.

Next year I will be located south of France near Fréjus, this will help somewhere.

Good skies.

Stanislas-Jean



#8 stanislas-jean

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Posted 21 November 2019 - 04:00 AM

Here is a report of uranus performed last 20th november with 150mm apertures.
Average to almost good images were met Under 324 and 362x magnifications.
Still the similar banding pattern catched last 8th.
However a variability was captured on the temperate band north, its move was revealed after 3H of planet rotation.
Still a dark pôle but may be fainter.
Indeed the contrasts are considerably enhanced for drawing.

Good skies.

Stanislas-Jean

 

resized_Uranus 20.11.19 18H10UT.jpg


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#9 niteskystargazer

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Posted 21 November 2019 - 03:10 PM

 Stanislas-Jean,

 

Nice sketches your report of uranus performed last 20th november with 150mm apertures. smile.gif ,

 

CS,KLU,

 

thanx.gif ,

 

Tom



#10 frank5817

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Posted 21 November 2019 - 07:50 PM

Stanislas-Jean,

 

Good sketches. Visible differences from your sketches 11 days back.

 

Frank :)



#11 stanislas-jean

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Posted 22 November 2019 - 08:13 AM

Thanks Tom, Frank for your words.

Anyway the 235mm, I have, could show the similar or less, but this is.

I left the 305mm one year ago because of the site quality being worst with time being.

I invest Something in South of France and expect Something better but remaining on expectations..

We will see.

I tried a 150mm apo on borrow from an us observer, got results that were just a little above from my istar 150mm F10 achro.

So the istar remained enough for.

Indeed for me a 180-200 would be a must enough, I know, having in past a 200mm vixen cass and a russian cass 180mm, sold..

Hope a 200mm CC like the 154mm.Here is a report of uranus performed last 20th november with 150mm apertures.
Average to almost good images were met Under 324 and 362x magnifications.
Still the similar banding pattern catched last 8th.
However a variability was captured on the temperate band north, its move was revealed after 3H of planet rotation.
Still a dark pôle but may be fainter.
Indeed the contrasts are considerably enhanced for drawing.

Personnally my personal limit for U is (D-d)x strehl optical global, so, 150mm x 0 93 = 139mm (refractor)

(154mm -54) x 0.95 =95mm (for the CC). where the 150mm achromat is obvious on and the CC154 remained on the threeshold on my vision. When 7/10 images are met close to U, therefore the 150 achromat is obvious.

The CC154 can be a confirmation, not less aperture in cause

Hope this is a clarification here, if any.

The variability is there.

Stanislas-Jean



#12 Aquarellia

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Posted 28 November 2019 - 05:00 AM

Thanks a lot Michel for your words.

Should be interresting to follow such but weather is not cooperating.

Foracast weather for winter here is not good being stated heavy rainy and cloudy mostly.

Next year I will be located south of France near Fréjus, this will help somewhere.

Good skies.

Stanislas-Jean

Hey, that's quite close to my home, maybe we will meet both of us !

Michel



#13 stanislas-jean

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Posted 29 November 2019 - 03:59 AM

I know, Michel, for the distance.

This could be done next year if everything OK, there was a tremendous flooding on this area last Week.

Good skies.

Stanislas-Jean



#14 stanislas-jean

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Posted 02 December 2019 - 04:43 AM

Here is a report of Uranus performed last 1st december Under just average images but with some short times of relative stability.
The pattern of the planet was catched, it seemed on the temperate band north the presence of a relative darker segment.
Anyway the segment limit was not defined conspicuously with regards the sky conditions.
Still the dark pôle presence on the disk.
Difficult to say more.

It seems that we may have the 3 next nights clear here, may I suggest to have a look on this planet, we may do comparisons.

Remains the fog for occulting the here area.

Good skies.

Stanislas-Jean

 

resized_uranus 01.12.19 22H20UT.jpg


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#15 stanislas-jean

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Posted 03 December 2019 - 05:50 AM

The report of 2nd December.

Good skies

Stanislas-Jean

 

resized_uranus 02.12.19 19H45UT.jpg


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#16 niteskystargazer

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Posted 03 December 2019 - 02:29 PM

 Stanislas-Jean,

 

Nice sketches smile.gif .

 

CS,KLU,

 

thanx.gif ,

 

Tom



#17 stanislas-jean

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Posted 04 December 2019 - 09:05 AM

Thanks a lot Tom for your kind words.

SJ



#18 stanislas-jean

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Posted 05 December 2019 - 02:23 PM

Here is a report of Uranus performed last 4th December with the 150mm refractor.

Images were just average at the beginning of the session but became good to very good just before the fog income.

Some variabilities rather subtil was catched and still a dark pôle.

The clear band close to the equator, north hemisphere,  was seen as the brightest feature on the planet disk.

Now we get deep fog here Under a clear sky above.

Faithfully.

Stanislas-Jean

 

resized_Uranus 04.12.19 18H10UT.jpg


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