Cassini’s last view of Titan


Week Three: Ninth Anniversary Fund-Raising Drive for Behind the Black
 

It is now the third week in my annual anniversary fund-raising campaign for Behind the Black.


Please consider donating. I am trying to avoid advertising on this website, but will be forced to add it if I do not get enough support from my readers. You can give a one-time contribution, from $5 to $100, or a regular subscription for as little as $2 per month. Your support will be deeply appreciated, and will allow me to continue to report on science and culture freely.


Regular readers can support Behind The Black with a contribution via paypal:

Or with a subscription with regular donations from your Paypal or credit card account:


 

If Paypal doesn't work for you, you can support Behind The Black directly by sending your donation by check, payable to Robert Zimmerman, to
 
Behind The Black
c/o Robert Zimmerman
P.O.Box 1262
Cortaro, AZ 85652

The Cassini science team today released a mosaic of the last images Cassini took of Titan before it crashed into Saturn’s atmosphere four days layer.

The mosaic shows Titan’s north polar region, and shows seas, lakes, and spotty clouds. The lack of clouds is a puzzle to scientists, as they had expected the north polar region to be cloud-covered at this time as summer arrived there, as had been seen at the south pole.

During Titan’s southern summer, Cassini observed cloud activity over the south pole.

However, typical of observations taken during northern spring and summer, the view here reveals only a few small clouds. They appear as bright features just below the center of the mosaic, including a few above Ligeia Mare. “We expected more symmetry between the southern and northern summer,” said Elizabeth (“Zibi”) Turtle of the Johns Hopkins Applied Physics Lab and the Cassini Imaging Science Subsystem (ISS) team that captured the image. “In fact, atmospheric models predicted summer clouds over the northern latitudes several years ago. So, the fact that they still hadn’t appeared before the end of the mission is telling us something interesting about Titan’s methane cycle and weather.”

The truth is we haven’t the slightest idea whether the clouds over the south pole during its previous summer were normal or an aberration. We have barely seen a full year of seasons at Saturn and Titan. To confidently extrapolate any pattern from this slim data is silly.

Share

One comment

  • Max

    Saturn ranges between nine and 10 AU from the sun. That’s 40 times less sunlight then we receive. Putting the temperature near 400° below zero. Most of the moons receive more heat from saturn than they do from the sun. If they were expecting a big change in a small moons atmosphere because someone calls it summer…

Leave a Reply

Your email address will not be published. Required fields are marked *