APOD: Cassini Approaches Saturn (2020 Apr 19)

Comments and questions about the APOD on the main view screen.
User avatar
APOD Robot
Otto Posterman
Posts: 4483
Joined: Fri Dec 04, 2009 3:27 am

APOD: Cassini Approaches Saturn (2020 Apr 19)

Post by APOD Robot » Sun Apr 19, 2020 4:05 am

Image Cassini Approaches Saturn

Explanation: What would it look like to approach Saturn in a spaceship? One doesn't have to just imagine -- the Cassini spacecraft did just this in 2004, recording thousands of images along the way, and hundreds of thousands more since entering orbit. Some of Cassini's early images have been digitally tweaked, cropped, and compiled into the featured inspiring video which is part of a larger developing IMAX movie project named In Saturn's Rings. In the concluding sequence, Saturn looms increasingly large on approach as cloudy Titan swoops below. With Saturn whirling around in the background, Cassini is next depicted flying over Mimas, with large Herschel Crater clearly visible. Saturn's majestic rings then take over the show as Cassini crosses Saturn's thin ring plane. Dark shadows of the ring appear on Saturn itself. Finally, the enigmatic ice-geyser moon Enceladus appears in the distance and then is approached just as the video clip ends. After more than a decade of exploration and discovery, the Cassini spacecraft ran low on fuel in 2017 was directed to enter Saturn's atmosphere, where it surely melted.

<< Previous APOD This Day in APOD Next APOD >>

Guest

Re: APOD: Cassini Approaches Saturn (2020 Apr 19)

Post by Guest » Sun Apr 19, 2020 5:10 am

I hate when people add music to videos like this.

User avatar
orin stepanek
Plutopian
Posts: 7012
Joined: Wed Jul 27, 2005 3:41 pm
Location: Nebraska

Re: APOD: Cassini Approaches Saturn (2020 Apr 19)

Post by orin stepanek » Sun Apr 19, 2020 12:53 pm

Cassini must have been rotating at approach and passing at the time! 8-)
Orin

Smile today; tomorrow's another day!

Tszabeau

Re: APOD: Cassini Approaches Saturn (2020 Apr 19)

Post by Tszabeau » Sun Apr 19, 2020 1:07 pm

WOW! That was worth the wait!

starsurfer
Stellar Cartographer
Posts: 4572
Joined: Thu Mar 15, 2012 7:25 pm

Re: APOD: Cassini Approaches Saturn (2020 Apr 19)

Post by starsurfer » Sun Apr 19, 2020 1:50 pm

Guest wrote:
Sun Apr 19, 2020 5:10 am
I hate when people add music to videos like this.
Just mute the sound. :D

dianaeforrest@talktalk.net

Re: APOD: Cassini Approaches Saturn (2020 Apr 19)

Post by dianaeforrest@talktalk.net » Sun Apr 19, 2020 2:04 pm

How come you can see the stars through the dark part of Saturn's rings? Diana

User avatar
Cousin Ricky
Science Officer
Posts: 368
Joined: Mon Aug 26, 2013 4:08 pm
Location: St. Thomas, U.S. Virgin Islands (+18.3, -64.9)

Re: APOD: Cassini Approaches Saturn (2020 Apr 19)

Post by Cousin Ricky » Sun Apr 19, 2020 2:13 pm

dianaeforrest@talktalk.net wrote:
Sun Apr 19, 2020 2:04 pm
How come you can see the stars through the dark part of Saturn's rings? Diana
The dark parts are where the particle density is lowest.

User avatar
Chris Peterson
Abominable Snowman
Posts: 16234
Joined: Wed Jan 31, 2007 11:13 pm
Location: Guffey, Colorado, USA

Re: APOD: Cassini Approaches Saturn (2020 Apr 19)

Post by Chris Peterson » Sun Apr 19, 2020 2:19 pm

Cousin Ricky wrote:
Sun Apr 19, 2020 2:13 pm
dianaeforrest@talktalk.net wrote:
Sun Apr 19, 2020 2:04 pm
How come you can see the stars through the dark part of Saturn's rings? Diana
The dark parts are where the particle density is lowest.
That's true for the rings that are illuminated by the Sun. The other dark parts are the places in shadow. Even the densest ring segments are translucent, though. The only reason that stars aren't apparent through the sunlit regions is because they're too bright to notice them.
Chris

*****************************************
Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com

User avatar
Cousin Ricky
Science Officer
Posts: 368
Joined: Mon Aug 26, 2013 4:08 pm
Location: St. Thomas, U.S. Virgin Islands (+18.3, -64.9)

Re: APOD: Cassini Approaches Saturn (2020 Apr 19)

Post by Cousin Ricky » Sun Apr 19, 2020 2:20 pm

Rossini’s Barber of Seville : “Rabbit of Seville,” as
Rossini’s William Tell overture, 3rd movement, “Ranz des Vaches” : Warner Brothers cartoons, as
Rossini’s William Tell overture, 4th movement, “March of the Swiss Soldiers” : The Lone Ranger, as
Barber’s Adagio for Strings, opus 11 : Platoon.

I don’t know if I can get Saturn to replace Platoon in my head. Maybe if I run this video in a loop for 2 hours...

User avatar
Cousin Ricky
Science Officer
Posts: 368
Joined: Mon Aug 26, 2013 4:08 pm
Location: St. Thomas, U.S. Virgin Islands (+18.3, -64.9)

Re: APOD: Cassini Approaches Saturn (2020 Apr 19)

Post by Cousin Ricky » Sun Apr 19, 2020 3:17 pm

Guest wrote:
Sun Apr 19, 2020 5:10 am
I hate when people add music to videos like this.
If this were an on-the-ground star party without social distancing, I would agree, and say “Get some earbuds!” But you can mute a video, especially Vimeo, which doesn’t autoplay.

User avatar
Astronymus
Science Officer
Posts: 122
Joined: Wed Nov 10, 2010 10:26 pm
AKA: Astro
Location: Alps

Re: APOD: Cassini Approaches Saturn (2020 Apr 19)

Post by Astronymus » Sun Apr 19, 2020 5:08 pm

I have my speakers turned off in general and only turn them on when I need them. Just saying.
»Only a dead Earth is a good Earth.«

starsurfer
Stellar Cartographer
Posts: 4572
Joined: Thu Mar 15, 2012 7:25 pm

Re: APOD: Cassini Approaches Saturn (2020 Apr 19)

Post by starsurfer » Sun Apr 19, 2020 9:07 pm

@ 1:30, That's a moon!

Boomer12k
:---[===] *
Posts: 2691
Joined: Sun Apr 22, 2007 12:07 am

Re: APOD: Cassini Approaches Saturn (2020 Apr 19)

Post by Boomer12k » Mon Apr 20, 2020 3:01 am

Amazing that Saturn looks so smooth and undisturbed, yet Jupiter is a swirl of storms and activity... maybe Jupiter should have bigger rings???
Well, they seem calming...

Forrest White
Ensign
Posts: 39
Joined: Wed Nov 11, 2020 12:57 pm

Re: APOD: Cassini Approaches Saturn (2020 Apr 19)

Post by Forrest White » Mon Nov 30, 2020 10:50 am

By September, the Cassini's fuel supply should come to an end and the probe's mission will be completed. The spacecraft was first launched on September 15, 1997. Thanks to Cassini we found out that the Titan moves away from Saturn which means that Titan can swallow the Earth in the Future.

User avatar
Ann
4725 Å
Posts: 11659
Joined: Sat May 29, 2010 5:33 am

Re: APOD: Cassini Approaches Saturn (2020 Apr 19)

Post by Ann » Mon Nov 30, 2020 12:36 pm

Forrest White wrote:
Mon Nov 30, 2020 10:50 am
By September, the Cassini's fuel supply should come to an end and the probe's mission will be completed. The spacecraft was first launched on September 15, 1997. Thanks to Cassini we found out that the Titan moves away from Saturn which means that Titan can swallow the Earth in the Future.
Titan can swallow the Earth?

That would certainly be a mouthful for Titan, don't you think?

Anyway, how could Titan be ejected from its orbit around Saturn? And if it was to be ejected after all, improbable as that would be, why would Titan collide with the Earth? The sheer size of the volume of space between Saturn and the Earth boggles the mind.

Ann
Color Commentator

User avatar
Chris Peterson
Abominable Snowman
Posts: 16234
Joined: Wed Jan 31, 2007 11:13 pm
Location: Guffey, Colorado, USA

Re: APOD: Cassini Approaches Saturn (2020 Apr 19)

Post by Chris Peterson » Mon Nov 30, 2020 1:24 pm

Forrest White wrote:
Mon Nov 30, 2020 10:50 am
By September, the Cassini's fuel supply should come to an end and the probe's mission will be completed. The spacecraft was first launched on September 15, 1997. Thanks to Cassini we found out that the Titan moves away from Saturn which means that Titan can swallow the Earth in the Future.
???

The Cassini mission ended in 2017 when it was de-orbited into Saturn.

Titan is gravitationally bound to Saturn. The sort of multiple body interaction that would be required to eject it from that system is exceedingly unlikely to occur over the lifetime of our Sun. And if it did, the likelihood of it ending up on an orbit intersecting the Earth is equally tiny.
Chris

*****************************************
Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com