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Saturn phenomena

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#1 deSitter

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Posted 09 June 2017 - 06:30 PM

Saturn is essentially at opposition for the next week, with the actual event on the 14th. A couple of interesting things are going on that are worth looking for.

 

1) The rings are as open as they get. The short diameter of the ellipse of the rings is 19" of arc! The long diameter is 42", bigger than Jupiter.

 

2) The shadow of Saturn falls wholly on the rings and does not interrupt it.

 

3) The ball should be visible through the Cassini division opposite the shadow.

 

4) The far edge of the shadow is tangent to the Encke division and may be of use in seeing that elusive feature.

 

5) This is the time to look for dusky shadings in the main ring.

 

6) Because the rings are at their widest, this is the best time to see the crepe ring effect, seeing the ball through the innermost ring.

 

7) The polar region is at its best aspect.

 

edit: Interaction of the shadow of Saturn and the Encke division should produce a visual effect whereby the shadow appears to be flattened and extended, not the smooth elliptical curve of the shadow of a sphere cast on a plane.

 

-drl


Edited by deSitter, 09 June 2017 - 06:34 PM.

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#2 rolo

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Posted 09 June 2017 - 06:35 PM

Dang! And I got rid of my Dynamax!


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#3 deSitter

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Posted 09 June 2017 - 06:51 PM

Dang! And I got rid of my Dynamax!

Dummy! Make do with the C9.25

 

-drl


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#4 terraclarke

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Posted 09 June 2017 - 06:56 PM

Dang! And I got rid of my Dynamax!

:rofl: :rofl: :rofl:


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#5 NiteGuy

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Posted 09 June 2017 - 06:58 PM

Time to pull out the old 3x Boy Scout binoculars again! Last time I used these was one of those years when Mars got bigger than the Full Moon. Yep, gotta love astronomy.

 

Back to the real world...one more Saturn thing...for about a week before opposition and a week after opposition, the rings themselves will brighten up much more than normal, so see if you can also detect that.


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#6 rolo

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Posted 09 June 2017 - 07:03 PM

 

Dang! And I got rid of my Dynamax!

Dummy! Make do with the C9.25

 

-drl

 

I guess I have no choice...



#7 Rovert9988

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Posted 09 June 2017 - 10:49 PM

Saturn is essentially at opposition for the next week, with the actual event on the 14th. A couple of interesting things are going on that are worth looking for.

 

1) The rings are as open as they get. The short diameter of the ellipse of the rings is 19" of arc! The long diameter is 42", bigger than Jupiter.

 

2) The shadow of Saturn falls wholly on the rings and does not interrupt it.

 

3) The ball should be visible through the Cassini division opposite the shadow.

 

4) The far edge of the shadow is tangent to the Encke division and may be of use in seeing that elusive feature.

 

5) This is the time to look for dusky shadings in the main ring.

 

6) Because the rings are at their widest, this is the best time to see the crepe ring effect, seeing the ball through the innermost ring.

 

7) The polar region is at its best aspect.

 

edit: Interaction of the shadow of Saturn and the Encke division should produce a visual effect whereby the shadow appears to be flattened and extended, not the smooth elliptical curve of the shadow of a sphere cast on a plane.

 

-drl

 

Am I seeing the interaction of Saturn and the Encke division in this image I took about a week ago? At first I thought something was wrong with my data or processing, but now I'm thinking it may just be a strange visual effect.

Saturn 5-28-17

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#8 rolo

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Posted 09 June 2017 - 10:56 PM

There's no trace of the Encke's division in that image. Reminds me of the views through a 60mm refractor.



#9 deSitter

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Posted 10 June 2017 - 12:26 AM

 

Saturn is essentially at opposition for the next week, with the actual event on the 14th. A couple of interesting things are going on that are worth looking for.

 

1) The rings are as open as they get. The short diameter of the ellipse of the rings is 19" of arc! The long diameter is 42", bigger than Jupiter.

 

2) The shadow of Saturn falls wholly on the rings and does not interrupt it.

 

3) The ball should be visible through the Cassini division opposite the shadow.

 

4) The far edge of the shadow is tangent to the Encke division and may be of use in seeing that elusive feature.

 

5) This is the time to look for dusky shadings in the main ring.

 

6) Because the rings are at their widest, this is the best time to see the crepe ring effect, seeing the ball through the innermost ring.

 

7) The polar region is at its best aspect.

 

edit: Interaction of the shadow of Saturn and the Encke division should produce a visual effect whereby the shadow appears to be flattened and extended, not the smooth elliptical curve of the shadow of a sphere cast on a plane.

 

-drl

 

Am I seeing the interaction of Saturn and the Encke division in this image I took about a week ago? At first I thought something was wrong with my data or processing, but now I'm thinking it may just be a strange visual effect.

 

That looks like an imaging artifact. Nice image, good color!

 

-drl


Edited by deSitter, 10 June 2017 - 02:19 AM.


#10 Richard Whalen

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Posted 10 June 2017 - 12:33 AM

In my experience, seeing encke division requires lots or magnification and perfect seeing. I use 525x as a starting point, the few times I've seen it clearly was around 800x. Hope it clears up here as its on my list to try again, last time was in the early 2000s.


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#11 deSitter

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Posted 10 June 2017 - 01:58 AM

In my experience, seeing encke division requires lots or magnification and perfect seeing. I use 525x as a starting point, the few times I've seen it clearly was around 800x. Hope it clears up here as its on my list to try again, last time was in the early 2000s.

Yes, you'd need 400x and at least an optically perfect 6" scope plus good to great seeing.

 

-drl



#12 rolo

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Posted 10 June 2017 - 07:45 AM

 

In my experience, seeing encke division requires lots or magnification and perfect seeing. I use 525x as a starting point, the few times I've seen it clearly was around 800x. Hope it clears up here as its on my list to try again, last time was in the early 2000s.

Yes, you'd need 400x and at least an optically perfect 6" scope plus good to great seeing.

 

-drl

 

And the rings wide open as they are now.



#13 Richard Whalen

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Posted 10 June 2017 - 09:35 AM

I'm going to try in my 8" and 6", not much hope in my 6", eyesight is not what it once was. I figure I will be lucky to see it in my 8", was very difficult in the past. 



#14 starman876

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Posted 10 June 2017 - 10:24 AM

going to get out my 50mm and take a good look at this.


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#15 Dartguy

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Posted 10 June 2017 - 08:10 PM

Dang! And I got rid of my Dynamax!

That has to be the post of the month!!  If I had just taken a sip, there would be Fat Tire on the screen.

 

I bet you were saving that line for a few weeks.


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#16 Gil V

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Posted 11 June 2017 - 01:57 PM


Dang! And I got rid of my Dynamax!

That has to be the post of the month!! If I had just taken a sip, there would be Fat Tire on the screen.

I bet you were saving that line for a few weeks.

Nah, he keeps it in a 3x5 card in his shirt pocket.
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#17 terraclarke

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Posted 11 June 2017 - 03:25 PM

 

In my experience, seeing encke division requires lots or magnification and perfect seeing. I use 525x as a starting point, the few times I've seen it clearly was around 800x. Hope it clears up here as its on my list to try again, last time was in the early 2000s.

Yes, you'd need 400x and at least an optically perfect 6" scope plus good to great seeing.

 

-drl

 

The best view I ever had of Encke's Division was last year after a club meeting with the 1845 Merz und Mahler 11 inch refractor at the Cincinnati Observatory. It was well defined and easily visible. 

 

http://www.cincinnat...er-refractor-1/


Edited by terraclarke, 11 June 2017 - 05:59 PM.


#18 rcwolpert

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Posted 11 June 2017 - 05:53 PM

I saw Encke's Division with my C-11 and Pentax XO 5mm eyepiece (353X) on June 3, 2013 after going "WOW" for several minutes at the magnificent view. It was one of those perfect nights in the San Jose, CA suburban skies. The Moon was 18.4%. My notes say, "The Cassini Division is a clear, large gap. The C ring of the inner area was seen, the Enke Gap in the A ring was visible at the outer edges at times. Surface markings seen." The same night I also saw M104 (Sombrero Gal.), M68, and NGC 4684, a 13.0 mag galaxy 2.9' wide. I love nights like that.


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