Continuing my writeup of notes from last week's Division for Planetary Sciences meeting: presentations on the risks of future asteroid impacts. How much risk do we face, and what are the appropriate actions to take in the face of that risk?
New ground-based images of Uranus show more finely detailed structure than any photos I have ever seen.
It was a surprise and delight to have our Icarus paper highlighted in Emily Lakdawalla's blog. Thanks for highlighting Uranus, since it has gotten, ahem, a bum rap over the years. Here's more about our discovery of the dark spot on Uranus.
Posted by Emily Lakdawalla on 2012/06/28 12:02 CDT
Hang out with Fraser Cain and amateur astronomers all over the world in Cosmoquest's Virtual Star parties conducted over Google+. Here's how -- plus an inspiring video produced by Google to show just how cool this is.
A measurement of the Andromeda galaxy's proper motion shows it's coming directly at us, and will collide with the Milky Way in 4 billion years. The event will transform the appearance of our night sky.
Someone on Twitter pointed me to a paper recently posted to ArXiv titled "Evidence for 9 planets in the HD 10180 system." If the (tentative) conclusion holds up, HD 10180 will be the first exoplanetary system known to have more planets than our own.
Posted by Emily Lakdawalla on 2011/08/12 12:52 CDT
Amateur astronomer Patrick Wiggins sent me this neat little animation of comet Garradd moving against background stars through an hour's worth of observing. I'm not any kind of astronomer but if I were I think I would get a kick out of looking at things that appear to move within one night of watching -- asteroids, comets, Jupiter's spots. I'm impatient that way.
Posted by Emily Lakdawalla on 2011/04/15 02:37 CDT
Since the Galileo mission discovered tiny Dactyl circling Ida in 1993, quite a lot of asteroid systems have been found to be binary; there are even a few triples. So it's quite reasonable to guess that two of the biggest asteroids, Ceres and Vesta, might also have satellites.
Posted by Emily Lakdawalla on 2011/02/23 12:47 CST
Asteroid (216) Kleopatra has been interesting to astronomers for a long time because its brightness is highly variable, but it seems to get more interesting every time somebody looks at it with a new instrument. This week a paper was published in Icarus revealed that it's 30 to 50% empty space.
Posted by Emily Lakdawalla on 2010/10/25 11:18 CDT
An awful lot of the talks in the Pluto session on Tuesday morning, October 5, at the Division of Planetary Sciences meeting spent more time focusing on how bad weather conditions were during the astronomers' attempts to view Pluto as it occulted background stars than they did on any measurements or science that came out from the data.