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Saturns rings to do a vanishing act, Aug11

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Saturns rings to do a vanishing act, Aug11 was created by dave_lillis

Hi all,
August 11th is equinox time on Saturn, this means its 200000 mile wide 1/2 mile thick ring system is edge on to the Sun and that the rings will be in their own shadow so making them disappear.

www.astromart.com/news/news.asp?news_id=975
Only problem is Saturns proximity to the sun, so maybe catch it soon before sunset is the way to go. hopefully it'll be clear, this would make for a very interesting event to see.
Dave L. on facebook , See my images in flickr
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13 years 6 months ago #80102

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Replied by Seanie_Morris on topic Re:Saturns rings to do a vanishing act, Aug11

Thanks for posting Dave.

I thought it was September 4th this was to be 'official'?

Seanie.
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13 years 5 months ago #80117

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Replied by dave_lillis on topic Re:Saturns rings to do a vanishing act, Aug11

Hi Seanie,
On Sept 4th, the rings are edge on as seen from Earth.
On Aug 11th, the rings are edge on as seen from the Sun so they would be invisible from anywhere in the solarsystem, maybe Saturns globe could provide some dim illumination, who knows.
It'll be interesting to see if Cassini images this.!
Dave L. on facebook , See my images in flickr
Chairman. Shannonside Astronomy Club (Limerick)

Carrying around my 20" obsession is going to kill me,
but what a way to go. :)
+ 12"LX200, MK67, Meade2045, 4"refractor
Last edit: 13 years 5 months ago by dave_lillis.
13 years 5 months ago #80124

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If rings are not edge on with respect to Earth but are edge on with respect to Sun and assuming that only edge is illuminated (both top-side and under-side of plane of rings not illimuninated) then surely the rings would appear black against the surface of the planet (as they are not edge on to us).

It is possible though that the size of this view might be so small that they can't be seen from Earth. I can, however, imagine the "ears" becoming invisible to us.

Regardless of any truth or error in my visualisation of this it would be nice if this was captured somehow.

Mark
13 years 5 months ago #80129

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Replied by Seanie_Morris on topic Re:Saturns rings to do a vanishing act, Aug11

Dave_Lillis wrote:

On Aug 11th, the rings are edge on as seen from the Sun so they would be invisible from anywhere in the solarsystem



...as seen along the ecliptic (plane of the Sun)?

:huh:
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13 years 5 months ago #80158

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Replied by dave_lillis on topic Re:Saturns rings to do a vanishing act, Aug11

yip! :bigshock:
how cool is that :bricks:
Dave L. on facebook , See my images in flickr
Chairman. Shannonside Astronomy Club (Limerick)

Carrying around my 20" obsession is going to kill me,
but what a way to go. :)
+ 12"LX200, MK67, Meade2045, 4"refractor
Last edit: 13 years 5 months ago by dave_lillis.
13 years 5 months ago #80164

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Whatever the view from Earth it appears that Cassini has already detected a new moonlet and may find more due to their "long" shadows across the ring systems.

This implies to me (with confusion still present) that some illumination will still take place (I infer this from second reference below).

Interesting times and Cassini being our "Correspondent From Saturn" to report on the event:)

news.bbc.co.uk/2/hi/science/nature/8194093.stm

saturn.jpl.nasa.gov/news/newsreleases/newsrelease20090807/

Mark
13 years 5 months ago #80197

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Replied by dave_lillis on topic Re:Saturns rings to do a vanishing act, Aug11

mjc wrote:

This implies to me (with confusion still present) that some illumination will still take place (I infer this from second reference below).
Mark

You've got a 75 thousand mile wide illuminated planet behind the rings, that is going to provide some light, the same way the astronauts shadows on the moon weren't completely black, the surround area illuminated them.
Also, the moons might be several hundred meters or several kilometers wide, wider then the rings, so they could end up been wider the width of the shadow cast by the rings, so catching some Sun.
Dave L. on facebook , See my images in flickr
Chairman. Shannonside Astronomy Club (Limerick)

Carrying around my 20" obsession is going to kill me,
but what a way to go. :)
+ 12"LX200, MK67, Meade2045, 4"refractor
Last edit: 13 years 5 months ago by dave_lillis.
13 years 5 months ago #80207

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Replied by Frank Ryan on topic Re:Saturns rings to do a vanishing act, Aug11

Tried to observe this last night and tonight...
Clouds.
Bah.
Any luck anyone?
My Astrophotography
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13 years 5 months ago #80258

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The Cassini images around equinox have been received.

This raw uncalibrated image (taken on 13th Aug) shows the contrast between bright planet and darkness of ring plane at that time.

saturn.jpl.nasa.gov/photos/raw/rawimaged...x.cfm?imageID=198568

Mark
13 years 5 months ago #80307

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