Many people ask us if we are still imaging the Phoenix lander, and the answer is yes, as long as there is enough light. Here is our latest view of the landing site, acquired December 21, 2008. Conditions are hazy and dark because as the season approaches northern winter on Mars, the sun does not rise as high in the sky. Looks cold!
We’re in the midst of the last cycle in MRO’s Primary Science Phase (PSP). Conjunction is coming up, when Mars is behind the Sun, so we won’t be able to communicate with the spacecraft for a few weeks. We’ll get a welcome break during that time – Uplink will have two whole planning cycles off, and Downlink will get a chance to catch up with their processing.
I can’t believe it’s been two years since the last conjunction and the start of PSP! A lot has changed since we started out with those first images. (more…)
Phoenix has announced on its Twitter feed that it’s likely at the end of its mission. They haven’t heard from the lander in over a week at this point, and it’s not looking very hopeful that they’ll have enough power to do so in the next few weeks before we go into conjunction.
The last image we took of the lander shows it sitting pretty, just as it has been since May 25th. We’ll take another picture this week, and probably continue to monitor the site after conjunction to study how frost covers the area. Next spring, MRO will be listening to see if Phoenix wakes up and calls home, but the odds of that are exceedingly slim, despite its epithet (see this blog entry for more about why this is most likely the real end of the mission).
I didn’t think I’d be so sad! It has been an exciting and successful mission, and I’m glad I could be involved in a small part of it. RIP, Phoenix! …or, rather, one of the better-written epitaphs submitted in Wired’s contest to eulogize the mission. There are some great ones in that list – some clever, some heartwarming, and some just funny. Personally, I like Phoenix’s last tweet best:
01010100 01110010 01101001 01110101 01101101 01110000 01101000 <3
(Unless you’re also a machine, you’ll probably need a binary converter like this one to get the message.)
I had the opportunity to attend the 40th annual meeting of the Division for Planetary Sciences of the American Astronomical Society. It’s being held here in Ithaca, NY at Cornell University. Along with some beautiful fall weather, I’ve also enjoyed some fantastic science. The meeting started with the Mars sessions on the first day. I think every single talk about the planet’s surface used HiRISE data! 
An entire session was devoted to the Martian atmosphere, which was interesting because I’m not as familiar with that. It’s also been great to see what’s going on in the rest of the solar system – I’ve been pretty Mars-oriented since starting with HiRISE, so I’ve loved hearing about things like the lakes on Titan, progress in exoplanet studies, and changes in Jupiter’s Great Red Spot.
As usual, other blogs are covering the meeting well (Planetary Society and the Martian Chronicles, for example). In addition, the sessions are all being web-streamed live (links to streaming video here; full program here). I think this afternoon’s special sessions are going to be really interesting, so I recommend watching them. I’m especially interested in the mission highlights from the rovers, Phoenix, MESSENGER, Cassini, and Kaguya. We’ve already seen some results from Kaguya and MESSENGER in the individual sessions – exciting stuff!
More interesting data from our web statistics: rankings of the most popular images on our website. Some you’d expect to get lots of hits: special campaigns like Phoenix lander hardware and Phobos, and of course old favorites like a certain feature in Cydonia. Others have made a splash in the news, like the avalanche caught in action and a deep pit that might be the entrance to a cave – whether their popularity on our website is a cause or effect of the media coverage.
I find it interesting to see which “regular” images, out of the thousands we’ve taken, caught people’s attention – in May, for example, gullies in a crater wall and ridges in Huo Hsing Vallis (left) were popular. June saw lots of hits on this beautiful image of the north polar layered deposits (above) and this image of delicate-looking, multi-tendriled slope streaks.
In July, the “Mystery Mounds” (PSP_008778_1685 and PSP_008548_2205) were popular, presumably because they are so “mysterious” – ? (By the way, these two areas, despite their similar titles, are nowhere near each other on Mars.) Lesson learned: We should give more of our images “sexy” titles. 
Our latest release includes more products from the original Phoenix descent observation, which include the color CCDs hand-mosaicked over the red filter CCDs. We’ve also been working with the Phoenix and MRO engineering teams to identify the location of the heat shield in the image (left). It’s pretty incredible that we caught the lander just after releasing the heat shield – a few more seconds, and it would have been out of the scene.
Emily Lakdawalla continues her excellent blog coverage in this article, which does a great job of explaining some of the reasons why this image was especially difficult to take. Along the way, she includes a tutorial on TDI (Time-Delay-Integration), written by one of the engineers that helped build the instrument. TDI is the method HiRISE uses to gather lots of light into its CCDs, and it’s one of the reasons we get such high signal-to-noise in our images. It’s a complicated concept, but it’s an important one for understanding HiRISE’s incredible imaging abilities, as well as its limitations.
From her blog post:
This is a fascinating story showing how necessary it sometimes is to have a deep understanding of an instrument in order to understand the data that comes from it. …It can be dangerous to read too much into space images until you have studied how the cameras really work.
It’s a great post – she deserves a cookie!
HiRISE imaged the Phoenix landing site 11 and 22 hours after touchdown. These have been used by the Phoenix team to determine their precise location and orientation on Mars. More details and images are on our main page.
Kudos to everyone who helped make this happen, from the navigation team at JPL delivering updated files, to our operations people who spent many long hours over the holiday weekend busily at work. And congratulations to the Phoenix team here in Tucson, who have embarked on what promises to be an exciting summer of science operations!
We caught it! 
MRO did a special imaging sequence to slew over to where the Phoenix spacecraft was plummeting down through the atmosphere, and it WORKED! I can’t believe what an engineering feat this was – the MRO spacecraft team’s pointing was right on, and Phoenix was exactly where they thought it would be.
When I left last night, we hadn’t gotten down the channel that included the parachute. The rest of the image is pretty low signal (and it’s a HUGE image), so we were searching through it for hours, trying to separate out cosmic ray hits and bright patches of ice. They had only given us a ~20% chance of getting it in our field of view, so I thought we had missed it. I finally went to bed feeling pretty frustrated, but woke up to find that, overnight we received additional channels of the image, and Richard Leis and some others here at HiROC had found THIS!
You can see the parachute itself, AND the lander encased in the heat shield dangling below it – AND you can see the STRINGS attaching them! This is the first time a spacecraft has ever been photographed as it descends through the atmosphere of another planet. Everyone here is incredibly excited about this image.
However, we’re too busy poring over the image we took after this one to spend too much more time on this. Hopefully soon we’ll be able to show you the lander itself, on the surface!
Go, Phoenix!
NASA press release: http://www.nasa.gov/mission_pages/phoenix/news/phoenix-20080526.html
We just saw on NASA TV that the first images came down – they look great! The solar panels are deployed, and you can see a bit of the surface with some small rocks. There’s also a really cool horizon image – you can see the polygons we’ve been imaging for years, right up close! — And from a very different perspective, of course!
An overflow crowd of thousands were in rapt attention here on the University of Arizona campus, as they watched the NASA Television coverage of the successful Phoenix Landing. It has been really amazing to see so many people gathered in support of their mission. It was literally standing room only here at the Charles P. Sonett space sciences building that hosts HiROC. There was actually a line to get into the Kuiper space sciences building, and another one for the Flandrau planetarium, while another crowd gathered out on the university Mall, and possibly another group down at the campus bookstore. People began watching attentively at all of these locations starting around an hour before touchdown. Tucson really showed its support for Phoenix today. People actually took down (carefully!) a large hanging mural so they could watch the display from outside the glass window of our building. I could tell that things were going well by the occasional outbursts of applause.
When Peter Smith gave enthusiastic shout outs to the UofA community and to Arizona, the crowd erupted in responsive applause. Congratulations to the Phoenix team and especially to those working on EDL at JPL in Pasadena and Lockheed in Denver.
