Rhea and Saturn by Cassini

jll · Post #1by **jll** » 30.07.2006, 10:16

A stunning movie from NASA

http://www.nasa.gov/mov/150536main_pia07806.mov

JLL

Post #2by **selden** » 30.07.2006, 17:54

It's a rather large file.
I think asking people to download something with no description of its size or subject material is inappropriate.

Where is the NASA page that describes it?

jll · Post #3by **jll** » 01.08.2006, 21:50

I'm sorry for this mistake. :oops:

This film from the Cassini probe, shows Rh?©a eclipsing a Saturn portion.

The page which route me towards this film is in French
http://www.cieletespace.fr/Actualites/449_rhea,eclipse,saturne,.aspx,

The original page from NASA's site is at
http://saturn.jpl.nasa.gov/multimedia/videos/video-details.cfm?videoID=121

JLL

Post #4by **selden** » 01.08.2006, 21:52

Thanks!

It is a beautiful movie.

Post #5by **Christophe** » 01.08.2006, 23:00

Thanks for sharing this.

The resolution is impressive, for a moment I thought it came from a simulation.

Chuft-Captain · Post #6by **Chuft-Captain** » 02.08.2006, 04:17

Compare with the Celestia version ...
CLICK on the picture

Johaen · Post #7by **Johaen** » 02.08.2006, 11:38

Chuft-Captain wrote:Compare with the Celestia version ...

Oh wow, that's pretty neat. The moon even seems to darken against the background of Saturn, just like the real thing.

In an interplay of contrast and shadow, the moon goes dark against the planet, and then its crescent suddenly brightens as it slips in front of Saturn's night side.

Chuft-Captain · Post #8by **Chuft-Captain** » 02.08.2006, 13:26

Johaen wrote:
Chuft-Captain wrote:Compare with the Celestia version ...
Oh wow, that's pretty neat. The moon even seems to darken against the background of Saturn, just like the real thing.

In an interplay of contrast and shadow, the moon goes dark against the planet, and then its crescent suddenly brightens as it slips in front of Saturn's night side.

As you say it "seems" to darken. As in real life, it's not really darkening, it's just your pupils adjusting to the change in contrast in response to the brighter background.
(I'm sure you already realised this :wink:

)

eg. If we minimise the effect of the bright background by narrowing the FOV the illusion of darkening is no longer so apparent.

Johaen · Post #9by **Johaen** » 02.08.2006, 13:51

Chuft-Captain wrote:As you say it "seems" to darken. As in real life, it's not really darkening, it's just your pupils adjusting to the change in contrast in response to the brighter background.
(I'm sure you already realised this )

I did, hehe

Chuft-Captain wrote:eg. If we minimise the effect of the bright background by narrowing the FOV the illusion of darkening is no longer so apparent.

Damn, I'll have to test this one out when I get home at work. It would probably be frowned upon for me to install Celestia on a gov't computer :wink: