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Dob, Jupiter not round?

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#1 Transit

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Posted 18 September 2021 - 10:58 PM

Hi Guys,

I checked the collimation  with the laser on my f8 6 in dob and it was slightly out.

Fixed that and got really sharp moon views.

Then swing over to Jupiter, it seemed to be out of round. Images confirmed it.

I haven't seen that before.

Did a web search to no avail.

What is this indicative of please ?

 

Pete in NZ



#2 NorthernlatAK

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Posted 18 September 2021 - 11:04 PM

Jupiter rotates once every 10 hrs so there's a bulge towards the equator because it spins so fast. The shape is called an oblate spheroid.
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#3 MisterDan

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Posted 18 September 2021 - 11:20 PM

Hi Guys,

I checked the collimation  with the laser on my f8 6 in dob and it was slightly out.

Fixed that and got really sharp moon views.

Then swing over to Jupiter, it seemed to be out of round. Images confirmed it.

I haven't seen that before.

Did a web search to no avail.

What is this indicative of please ?

 

Pete in NZ

As noted, Jupiter does have a noticeable equatorial bulge.  It's dark equatorial belts can "enhance" the planet's apparent bulge in an illusory effect.  The fashion adage regarding horizontal and vertical stripes is another example of that illusion (i.e. "horizontal stripes make you look fatter; vertical stripes make you look slimmer").

 

How "out of round" was Jupiter to your eye?  Along what axis was the "out of roundness?"  Did you try Saturn?

 

Here's hoping you simply had a better-than-average view of Jupiter's "natural" profile under excellent conditions in a well-collimated scope.

 

Best wishes.

Dan


Edited by MisterDan, 19 September 2021 - 02:25 PM.

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#4 Transit

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Posted 19 September 2021 - 12:46 AM

Far out almost 4,000 ks difference ! I had no idea smile.gif

It was across the belts. I didn't check Saturn

Thanks for the news !


Edited by Transit, 19 September 2021 - 12:47 AM.

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#5 Asbytec

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Posted 19 September 2021 - 09:09 AM

"Far out...!"


Took me straight back to the 70's...when I first realized Jupiter was a little wider along the equator. Besides, I had to stay on topic. :)

#6 areyoukiddingme

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Posted 19 September 2021 - 01:20 PM

Effect can be amplified by eyepiece distortion. 



#7 Transit

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Posted 20 September 2021 - 02:29 AM

Took me straight back to the 70's...when I first realized Jupiter was a little wider along the equator. Besides, I had to stay on topic. smile.gif

I'm enjoying coming to this pursuit in a time when so much gear and techniques are available


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#8 Transit

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Posted 20 September 2021 - 02:39 AM

Effect can be amplified by eyepiece distortion. 

I see, I was using the Celestron zoom but it seemed to show in my image too so presumably is the actual shape of that spinning gas ball !



#9 JoshUrban

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Posted 20 September 2021 - 08:32 AM

Right on!  And wait till you see a shadow transit.  The first time I saw the tiny black dot on the planet, I thought something was wrong SOMEwhere in the universe!



#10 KBHornblower

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Posted 20 September 2021 - 01:26 PM

Right on!  And wait till you see a shadow transit.  The first time I saw the tiny black dot on the planet, I thought something was wrong SOMEwhere in the universe!

And then there was that pair of black eyes I saw on Jupiter during the Shoemaker-Levy bombardment.



#11 Transit

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Posted 20 September 2021 - 03:17 PM

Right on!  And wait till you see a shadow transit.  The first time I saw the tiny black dot on the planet, I thought something was wrong SOMEwhere in the universe!

Too right!

Just seeing the 4 bright ones is exciting and how fast they whip past. I've got pretty bad floaters so struggle with details. Having found the marvelous brain filters them out with binocs, I have a bino viewer on the slow boat from china


Edited by Transit, 20 September 2021 - 03:19 PM.

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#12 Transit

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Posted 20 September 2021 - 03:21 PM

And then there was that pair of black eyes I saw on Jupiter during the Shoemaker-Levy bombardment.

I remember standing out on the footpath with my little daughter waiting for the whole thing to explode :-)




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