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!

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.

Join us this Sunday, May 25th from 3-8 PM on the University of Arizona campus for a celebration of the landing of our sister mission, Phoenix. The Kuiper building, Sonett lobby, (that’s where HiROC is located, and where we’ll be) and Flandrau planetarium will be open to the public. There will be speakers from the Phoenix and HiRISE teams, children’s activities, NASA TV running for live updates on the status of the lander, telescopes set up for viewing the sun, tours of the buildings, planetarium shows, and cake!

Detailed schedule of events:
http://www.lpl.arizona.edu/calendar/calendar.php?ID=107

We’ll be thinking of the Phoenix team during this critical step – we’ve got our fingers crossed, wishing you the best!

It seems like we’ve been preparing for the Phoenix mission for such a long time – and now it’s finally close to landing day! T-6 days according to our countdown clock! Things are getting pretty crazy here, and I thought a little overview of how the HiRISE team is supporting the Phoenix mission would be useful.

We’ve been imaging the northern plains for Phoenix since we started our mission (here’s a bunch of reconnaissance images on our website). The first images we got back showed lots of scary boulders (a close-up of one of our Transition images shown to the right), so we sampled other areas and searched for a relatively boulder-free landing spot. The area the Phoenix team finally chose is being called the “Green Valley“, not because of the “green light = safe to go” connotation, but rather because some geological maps made of the area happened to use green as the color for the valley. Perhaps coincidentally, Green Valley is also a town near Tucson, where both Phoenix and HiRISE are based. Whatever the reason, I like that the name has a lovely calm, comforting feel.

Once the Phoenix team picked out their landing site, we worked on a high-resolution mosaic of the entire 3-sigma landing ellipse (”3-sigma” means there is a 99% probability it will land within this area; see this great blog entry on landing ellipses at the Planetary Society). The Phoenix landing ellipse is shown to the left, along with the footprints of a number of HiRISE images. (This was before we were quite done with the mosaic.) These images have helped the Phoenix team characterize the regional geology and assess the safety of the landing site.

In addition to scouting landing sites, we’re also going to be involved with Phoenix during its prime mission on the ground. We’ve been planning and practicing several different ways of cooperating: (more…)