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Stories, updates, insights, and original analysis from The Planetary Society.
What "phase angle" means
As is probably obvious by now, I love playing with spacecraft image data. I am always looking for excuses to dive into space image archives to unearth images of stuff in space that haven't really been seen by very many people before.
Spinning spokes in Saturn's rings
Here's a neat animation captured last month by Cassini and assembled by Mike Malaska: spokes in Saturn's B ring.
Saturn shadows shift with the seasons
So many goodies on the Cassini raw images website lately! I am especially excited when Cassini takes photos through red, green, and blue filters so that it's possible to create views that look roughly like what you'd see with your own eyes.
Fun for Sunday: Titan and Tethys pas de deux
Checking in on Cassini's raw images this weekend, there are several nice shots to play with, including the many frames from which I tossed together this cute animation.
Rhea, Enceladus, Mimas, and Tethys, oh my!
With the last Titan flyby on October 12, Cassini came back to an orbit that's nearly in the equatorial plane, and immediately rewarded us with some fine views of several of the icy moons. Here are a bunch of images of those moons.
A brief word on Saturn's radius
I've had two people write in to correct my Phoebe ring post from yesterday.
The Phoebe ring
Last week, planetary astronomers Anne Verbiscer, Michael Skrutskie, and Doug Hamilton published a paper in Nature succinctly titled
OMG! Aurora!
Unmannedspaceflight.com member Astro0 was fiddling around with an interesting-looking sequence of Cassini images when he discovered their purpose -- they were gathered in order to see if Cassini could catch aurorae flaring into being near Saturn's north pole. Cassini sure did!
Changes in Titan's southern lakes
Today's science press release out of the Division of Planetary Sciences meeting concerns changes in lakes near Titan's south pole observed during Cassini's mission. In brief, repeat Cassini RADAR observations of the same spots during different Titan flybys turned up places where there appeared to be dark lakes in earlier images and dry lakes in later images.
Cassini RADAR continues to gaze at Titan
The Cassini spacecraft made its 59th flyby of Titan, Saturn's largest moon, on Friday, July 24, and in the last few hours we have received images from the RADAR instrument in SAR (Synthetic Aperture Radar) mode.
Designing the Cassini Tour
Each Titan flyby is not a fork in the road, but rather a Los Angeles style cloverleaf in terms of the dizzying number of possible destinations. So how did our current and future plans for the path of the Cassini spacecraft come to be? That's the question Dave Seal put to me since that's my job -- I am a tour designer.
Canto III: Hints of Equinox
Saturn is rapidly approaching equinox, where the Sun passes through the ring plane (south-to-north, i.e. the northern vernal equinox), and its ring system (i.e. its great now-gloomy poorly-lit circles of large blocks of water ice) is starting to show some really interesting behavior.
Canto II: Titan's Atmosphere and the Solar Cycle
David Seal explains the complications for Cassini coming from Titan's atmosphere and Solar Cycle.
Connections
David Seal muses on his time as the mission planner for Cassini, and the history behind its name, and astronomy in Rome.
A Moon Among Stars
A very pretty picture of a moon among stars. Happy 2009, everyone!
DPS meeting: Sunday: Lakes on Titan
This time around DPS features three separate oral sessions on Titan, indicating just how much attention that moon is getting from the scientific community right now. From the first session, on Titan's lower atmosphere, I'm just covering the two talks on Titan's lakes.
Proof for liquids on Titan
A press release from the Cassini VIMS team today is titled
Welcome to the Solar System, Makemake
The trans-Neptunian object formerly known as 2005 FY9 now has a name:
Beautiful mosaic of the Voyager mountains
One of my favorite amateur image magicians, Gordan Ugarkovic continues to play around with the amazing data recently released by the Cassini mission, covering the Iapetus encounter of last September. Here's a lovely mosaic he just put together of the Voyager Mountains.
Saturn, Tethys, and Titan
I thought that today's image release from the Cassini imaging team was exceptionally pretty.



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