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New names for Pluto's little moons Kerberos and Styx; and a new moon for Neptune
Posted by Emily Lakdawalla on 2013/07/15 01:37 CDT | 4 comments
Pluto's moons, formerly known as "P4" and "P5," are now named Kerberos and Styx; I thought I'd help place them into context with a little help from Cassini. Also, Neptune now has a 14th known moon.
Posted by Emily Lakdawalla on 2013/05/15 05:02 CDT | 6 comments
I've been out of town for a couple of days and am overwhelmed with work and an overflowing email box. So what do I do about that? I ignore what I'm supposed to be doing and play with Cassini raw image data, of course. Here is a "mutual event" of Mimas (the bigger moon) and Pandora (the outer shepherd of the F ring).
DPS 2012, Day 5: How to make asteroids crunchy on the outside and soft in the middle
Posted by Emily Lakdawalla on 2012/10/19 07:53 CDT | 2 comments
A summary of just one talk from the Division for Planetary Sciences meeting, by Lindy Elkins-Tanton, which provided a neat explanation for how asteroids can be melted and layered on the inside yet have a primitive-looking exterior.
DPS 2012, Monday: Icy moons and a four-star exoplanet
Posted by Emily Lakdawalla on 2012/10/15 11:31 CDT | 1 comments
In the first full day of the annual meeting of the Division of Planetary Sciences of the American Astronomical Society, I listened to scientific sessions on icy worlds and on an exoplanet in a four-star system.
Daphnis cruises through the Keeler Gap
Posted by Jason Davis on 2012/08/16 11:03 CDT
A recent series of ring images by the Cassini spacecraft reveal Saturn's tiny moon Daphnis cruising through the Keeler Gap.
Methone, an egg in Saturn orbit?
Posted by Emily Lakdawalla on 2012/05/21 02:58 CDT | 8 comments
Cassini obtained its first high-resolution images of Methone on May 20, 2012. Methone is one of the smallest regular moons of Saturn, having a diameter of only about 3 kilometers. It was the first moon that Cassini discovered, very early in Cassini's mission at Saturn, in 2004.
Posted by Emily Lakdawalla on 2012/04/20 01:01 CDT | 2 comments
I enthused about these Helene images the first time they came down from Cassini, and then forgot about them, and then was thrilled anew a couple of weeks ago when Daniel Macháček posted his version, processed from data published by the Cassini imaging team on April 1.
Pretty picture: Janus and Saturn
Posted by Emily Lakdawalla on 2012/04/04 12:15 CDT
In the last few days as it's rounded periapsis in its current orbit of Saturn, Cassini has taken a lot of great photos of Saturn's moons. One series of photos was taken from pretty close to Janus, a moon about a third the diameter of Enceladus that orbits between the F and G rings. And among those, several were taken with the moon sitting in front of Saturn.
Pretty pictures from Cassini's recent Dione flyby
Posted by Emily Lakdawalla on 2011/12/22 11:52 CST
Cassini flew close by Dione on December 12 and, as usual, the close pass provided opportunities for lots of dramatic photos, not just of Dione, but of other moons wandering by in the background.
What do we know about planetary rings? Quite a lot, actually!
Posted by Emily Lakdawalla on 2011/12/15 11:18 CST
A summary of a new article by Matt Tiscareno about planetary ring systems that reviews the known ring systems of the four giant planets and the prospects for ring systems yet to be discovered.
Pretty pictures: Dancing moons
Posted by Emily Lakdawalla on 2011/09/28 12:28 CDT
Pretty pictures: Dancing moons
Pretty picture: five moons for Cassini
Posted by Emily Lakdawalla on 2011/08/03 09:57 CDT
Explaining how to combine the red, green and blue images from a recent Cassini image session containing five of Saturn's moons: Janus, Pandora, Enceladus, Mimas and Rhea.
Cassini finally catches Helene
Posted by Emily Lakdawalla on 2011/06/20 04:41 CDT
Cassini finally catches Helene
Lots of great stuff in the latest Cassini data release
Posted by Emily Lakdawalla on 2011/04/13 04:56 CDT
I've got some lovely pictures from Saturn to show you! Every three months, the Cassini mission dumps gigabytes worth of precious Saturn data into the Planetary Data System, and the latest gift came on April 1. This particular pile of data, which was taken between April 1 and June 30, 2010, contains a lot of really terrific moon observations.
365 Days of Astronomy Podcast: What's up in the second quarter of 2011
Posted by Emily Lakdawalla on 2011/04/07 11:16 CDT
Regular readers of this blog will find the content of today's 365 Days of Astronomy Podcast familiar, because it's an update on what the solar system exploration spacecraft are up to, based on my monthly "what's up" updates.
LPSC 2011: Sponge-moon Hyperion
Posted by Mike Malaska on 2011/03/23 02:51 CDT
Saturn's moon Hyperion has a bizarre sponge-like appearance that is in dramatic contrast to other heavily cratered bodies in the solar system.
LPSC 2011: Day 4: Ted Stryk on icy moons and The Moon
Posted by Ted Stryk on 2011/03/17 11:22 CDT
Here are Ted Stryk's notes from the sessions he attended in the afternoon of Thursday, March 10, at the 42nd Lunar and Planetary Science Conference.
Two fine color Cassini animations: Prometheus rotating, Tethys and Dione dancing
Posted by Emily Lakdawalla on 2011/01/20 11:23 CST
Daniel Macháček has reached into the dark side of Prometheus and pulled out an incredible amount of detail where the potato-shaped moon is illuminated by Saturnshine. He produced an animation that morphs among the three sets of four-filter color images that Cassini snapped during the flyby.
Goodies from the January 11 Rhea flyby
Posted by Emily Lakdawalla on 2011/01/12 10:44 CST
Cassini got some incredibly tricky shots during its January 11 Rhea flyby!
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