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Astrophotography and Sketching >> Solar System Imaging & Processing

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Sunspot
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Uranus October 28
      #5555554 - 12/05/12 12:04 PM

Hi all,

Not much to look at, but here is an RGB image of Uranus from October 28.

http://www.sunspot51.com/OuterPlanets/Uranus/u2012-10-28_03-46_RGB_pmax.jpg

Paul


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dickbill
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Reged: 09/30/08

Re: Uranus October 28 new [Re: Sunspot]
      #5555688 - 12/05/12 01:29 PM

nice, a band is visible.
But the red edge?


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stanislas-jean
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Reged: 10/22/08

Re: Uranus October 28 new [Re: Sunspot]
      #5555724 - 12/05/12 01:53 PM

How do you place the rotation axis of the planet?
I have some idea about but needs to be confirmed.
Stanislas-Jean


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Sunspot
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Re: Uranus October 28 new [Re: stanislas-jean]
      #5556202 - 12/05/12 06:59 PM

I matched the orientation to the moons. Thanks!!

Paul


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stanislas-jean
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Reged: 10/22/08

Re: Uranus October 28 new [Re: Sunspot]
      #5556790 - 12/06/12 01:54 AM

So the south pole of the planet is right side, the rotation sense is up to down and the rotation axis is almost east-west.
Therefore you captured the thin lighted equatorial band, seemsly the south pole lighter than the hemisphere and darkenings in each hemisphere that may be correspond rather to the light repartition on a sphere.
It seems to appear 2 parallel bands on an other orientation but this is nothing to do.
Good one in RGB and rather excellent, this means the level contrasts faint but accessible still.
Stanislas-Jean


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stanislas-jean
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Reged: 10/22/08

Re: Uranus October 28 new [Re: stanislas-jean]
      #5556798 - 12/06/12 02:03 AM Attachment (12 downloads)

On the 1st Nov I did this with the 305mm.
A comparison may be.
Stanislas Jean


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John Boudreau
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Re: Uranus October 28 new [Re: Sunspot]
      #5557043 - 12/06/12 08:24 AM

Quote:

I matched the orientation to the moons. Thanks!!

Paul




Hi Paul,

Do you mean that it's celestial S up, or the planet's S pole itself?


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Sunspot
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Re: Uranus October 28 new [Re: John Boudreau]
      #5557161 - 12/06/12 09:48 AM Attachment (11 downloads)

This is how the moons were orientated when I shot the frames. This is from Winjupos. South is up and the direction of rotation is left to right. Uranus makes life very confusing and I confuse easily...

I'm thinking celestial south is up...right?

Paul


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sfugardi
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Re: Uranus October 28 new [Re: Sunspot]
      #5557463 - 12/06/12 12:36 PM

Paul, excellent image! Looks like real detail. I need to go back and reprocess my old Uranus data which I originally used Registax5 on. Just recently I figured out how to draw a manual box on 1 point with AS2! for processing Io after castrating the video first. The whole moon orientation/inverted mirror view deal on Uranus always has confused me. Thanks for posting

Regards,
Steve


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stanislas-jean
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Reged: 10/22/08

Re: Uranus October 28 new [Re: Sunspot]
      #5557466 - 12/06/12 12:39 PM Attachment (9 downloads)

The picture from Coelix gives you the right orientation for the time ccd shot.
Stanislas-Jean


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CPellier
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Reged: 08/07/10

Re: Uranus October 28 new [Re: Sunspot]
      #5557676 - 12/06/12 02:50 PM

Hi Paul, and all,
Given the position of the moons, the belt should be orientated at 90 from what it looks to be on the image, the worst case

The signal-to-noise ratio of the image looks weak too. Noise can easily be confused with true details on Uranus. Paul, for how long have you been capturing the movie and how many frames have been stacked ?


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Sunspot
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Re: Uranus October 28 new [Re: CPellier]
      #5557790 - 12/06/12 03:59 PM

Like I mentioned, I don't think there is any detail there. I was happy to get a nice color out of it.

I forget my exposure time, probably around 1/10sec. I captured 1000 frames and stacked 500 for each filter. But it is fun to do...even if the orientation of Uranus totally confuses me.

Thanks all.
Paul


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John Boudreau
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Re: Uranus October 28 new [Re: Sunspot]
      #5557855 - 12/06/12 04:48 PM

Quote:

This is how the moons were orientated when I shot the frames. This is from Winjupos. South is up and the direction of rotation is left to right. Uranus makes life very confusing and I confuse easily...

I'm thinking celestial south is up...right?

Paul



Hi Paul,

From your WinJUPOS simulation, your image has the S pole of Uranus up--- that's according to the convention used by the IAU (also WinJUPOS), the pole that is currently tilting towards Earth is the N pole. Celestial S is roughly at the 8 o'clock position of your image.


As Christophe mentions, any true belt detail would be orientated almost 90 from where a belt-like pattern exists in your image, so I'm afraid it's just a noise or artifact pattern.

But keep tryin'! With it's low surface brightness and small angular size Uranus is ripe for imaging gremlins.

While the bands have been weakly recorded in visible R light in typical amateur sized scopes this year, it's still best to use a near-IR longpass like the Baader 685 IR-pass to catch them--- even then it takes good seeing and a stack of several thousand frames to help quench the noise.


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Freddy WILLEMS
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Re: Uranus October 28 new [Re: John Boudreau]
      #5557875 - 12/06/12 04:59 PM

Oh man, you could image the rings ?

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Sunspot
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Re: Uranus October 28 new [Re: Freddy WILLEMS]
      #5557944 - 12/06/12 05:30 PM

Nah....too easy. Going for details on the moons....

Quote:

Oh man, you could image the rings ?




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stanislas-jean
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Reged: 10/22/08

Re: Uranus October 28 new [Re: Sunspot]
      #5558600 - 12/07/12 01:34 AM

Think the orientation is still not defined on the shot.
However have a look on, a yellowish fillet appear on the shot, this could be the equatorial zone (strange artifact!), but the orientation remain unclear, 90 rotation compensation is wrong because with regards to the satelites locations a tilt angle more is interfering. So.
If you look through the scope with no diagonal you should get the same pattern of the drawing, reason why.
Thanks for Coelix.
Stanislas-Jean


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