Tag: Rosetta

Rosetta: mission to land on a comet

By Phil Plait | March 30, 2012 11:00 am

In 2014, the European Space Agency’s Rosetta probe will enter orbit around a comet — the first time this will have ever been done — and then drop a lander on it — and oh yeah, that’s the first time this will have ever been done, too.

I’m pretty excited about this mission, and NASA and ESA have put together this really well-done video explaining the mission and what it’ll do:

I found this on the Rosetta Blog which has been a great source of info over the years. Rosetta has already been a very successful mission without even having reached its target yet: it’s swung by Mars, took stunning closeup images of the asteroid Lutetia, flew past another asteroid called Steins and got nifty pix of that, and also flew past Earth — twice! three times! — to steal some of our orbital energy to propel it on its way… and snapped one of my favorite pictures of Earth ever taken (seriously, click that link; have you ever seen a crescent Earth that beautiful?).

And yet all that is a prelude to what’s coming in a little over two year.

And if you can’t wait, the folks at JPL created a game called Comet Quest (for iPad and iPhone) where you control the Rosetta probe as it orbits the comet. You have to deploy the lander, identify and avoid hazards (like jets and rubble from the comet), an communicate with Earth to transmit your results. I played it for a while on the iPad and I have to admit it was fun. Give it a shot!

CATEGORIZED UNDER: Astronomy, Cool stuff, Space

Q&BA: How does a gravity slingshot work?

By Phil Plait | February 17, 2012 11:00 am

In this episode of my live Q&BA chat session, I answered a question about how "gravity slingshots" work. This is the process of using the gravity of a planet to accelerate (or decelerate) space probes so they can more easily get to the inner and outer planets. It turns out gravity is not the only process at work here.

This technique is used all the time for spacecraft, and engineers are pretty good about nailing them perfectly, too. Sometimes the probes pass by Earth and take amazing pictures of us, like when Rosetta did in 2009, and in 2007, or when it passed Mars in 2007.

Be sure to check out all my other Q&BA videos!

CATEGORIZED UNDER: Cool stuff, Q & BA, Science

Rosetta's stunning Mars

By Phil Plait | January 26, 2012 6:52 am

In 2007, the European Space Agency probe passed by Mars on its way to visit a comet. It used Mars for a gravity assist to help it on its way, and got close enough to take some very detailed pictures (it also passed by the asteroid Lutetia and returned amazing shots; see the gallery at the bottom of this post). That data wasn’t initially released by the mission leader (that’s fairly common in some missions), but they were finally made available late last year. My pal Emily Lakdawalla from the Planetary Society Blog grabbed a bunch of them and put together some simply amazing pictures from them, including this jaw-dropper:

Yeah. You really want to click that to Barsoomenate it. Holy dry ice polar caps!

In fact, you should go over to her blog where she gives all the details and has more incredibly cool pictures of the Red Planet as well. I don’t want to spoil her fun by giving it all away here. Go!

Credit: ESA / MPS / UPD / LAM / IAA / RSSD / INTA / UPM / DASP / IDA / processed by Emily Lakdawalla

Related posts:

Rosetta’s cometary goal now in sight
Lutetia may have witnessed the birth of the Earth
Curiosity on its way to Mars!


CATEGORIZED UNDER: Astronomy, Pretty pictures

Lutetia may have witnessed the birth of the Earth

By Phil Plait | November 15, 2011 7:00 am

When we look at the solar system now, we see it after it’s had billions of years of evolution under its belt. Things have changed a lot since it first formed out a swirling disk of material, 4.5 billion years ago. We can make some pretty good guesses about the way things looked back then, though. We can see other systems forming around other stars, for example, to get an idea of what things look like when they’re young.

But we can also look at our own solar system, look at the planets, the comets, the asteroids, and, like astronomical archaeologists, get a glimpse into our own cosmic past.

We know that asteroids formed along with the rest of the system back then. We also know that there are many kinds of asteroids: rocky, metallic, chondritic, some even have ice on or near their surface. Some formed far out in the solar system, and some formed near in. The thing is, we think the vast majority of the asteroids that formed close to the Sun were absorbed by — and by that, I mean smacked into and became part of — the inner planets, including Earth. Only a handful of those asteroids still remain intact after all this time. But now we think we’ve found one: the main belt, 130 km-long asteroid Lutetia.

Using a fleet of telescopes, astronomers carefully measured the spectrum of Lutetia — including spectra taken by the European Rosetta space probe, which visited Lutetia in July 2010 and returned incredible close-up images (see the gallery below). The spectra were then compared to spectra of meteorites found on Earth — meteorites come from asteroids after a collision blasts material from them, so they represent a collection of different kinds of asteroids that we can test in the lab here on Earth.

They found that the spectrum of Lutetia matches a very specific type of meteorite found on Earth, called enstatite chondrites. These rare rocks have a very unusual composition that indicates they were formed very near the Sun, where the heat from our star strongly affected their formation. They have a clearly different composition than meteorites which formed in asteroids farther out in the solar system, and are an excellent indication that Lutetia formed in the inner solar system, in the same region where the Earth did.

So Lutetia is a local! There aren’t many like it in the asteroid main belt between Mars and Jupiter, and in fact it’s a bit of a mystery how it got there; perhaps a near encounter with Earth or Venus flung it out that way, and then the influence of Jupiter made its orbit circular. And there it sits, a relatively pristine example of what the solar system was like when it was young. Currently, the Dawn space mission is orbiting the large asteroid Vesta, and will make its way to Ceres, the largest asteroid, after that. I have to wonder if NASA is eyeing Lutetia as another possible target. It’s an amazing chance to visit an object that may yield a lot of insight into our own planet when it was but a youth.

After all, you can take the asteroid out of the inner solar system, but you can’t take the inner solar system out of the asteroid.



Related posts:

Rosetta sends back gorgeous asteroid closeups
Asteroid comparison chart, Part II
Invaders from Vesta!

CATEGORIZED UNDER: Astronomy, Pretty pictures

Rosetta's cometary goal now in sight

By Phil Plait | June 9, 2011 11:03 am

Rosetta is an amazing probe launched by the European Space Agency. In 2014 it will go into orbit around the comet 67P/Churyumov-Gerasimenko, and actually deploy a lander to sample the surface!

That rendezvous is still years away, but the target is now in sight: Rosetta has returned its first image of the comet.

Oh, very cool! The top image is the wide angle shot, showing a densely-populated star field toward the center of our galaxy; from Rosetta that’s the direction to the comet. The second image zooms in a bit, and you can see some distant stars and nebulosity. The bottom one has been processed to remove the stars, and the nucleus of Churyumov-Gerasimenko stands out.

Note that this image was taken when Rosetta was still 163 million kilometers (100 million miles) from the comet — that’s more than the distance from the Earth to the Sun! That’s why it took a total of 13 hours of exposure time to see the comet in these images; it’s still extremely faint from that great distance.

Read More

CATEGORIZED UNDER: Astronomy, Cool stuff, Space

Ashes to ashes, stardust to stardust

By Phil Plait | April 12, 2011 7:00 am

On March 24, the NASA mission Stardust ran out of fuel and sent its last data to Earth. At 16:33 Pacific time the mission was officially ended.

Launched in 1999, Stardust became a wildly successful mission. It passed by the asteroid Annefrank, sampled the dust from one comet (Wild 2) — returning those samples to Earth in a special re-entry container while the spacecraft itself flew on — and looked closely at another (Tempel 1) to see the crater left by the Deep Impact mission.

It’s always sad to see a mission end, but I like to also keep my eyes ahead. Stardust may be done, but Rosetta flies on, heading toward a rendezvous with a comet where it will deploy an actual lander. The Dawn spacecraft will enter orbit around the main-belt asteroid Vesta later this year as well. And, of course, MESSENGER is now orbiting Mercury and returning data.

We learned a lot from Stardust, and we get better with this endeavor of solar system exploration as a result.

And that’s the whole point, isn’t it?

Image credit: NASA/JPL-Caltech

Related posts:

Followup: Deep Impact crater on Tempel 1
Stardust snaps close-ups of a second-hand comet!
A comet creates its own snowstorm!
The return of Stardust
Stardust@Home starts NOW


The Top 14 Astronomy Pictures of 2010

By Phil Plait | December 14, 2010 7:01 am

Use the thumbnails and arrows to browse the images, and click on the images themselves to go through to blog posts with more details and descriptions.


Asteroid comparison chart

By Phil Plait | July 20, 2010 7:22 am

Emily Lakdawalla — scientist, blogger, and all around cool chick — has just posted a totally awesome scale diagram comparing every asteroid and comet visited by spacecraft. It features pictures of all the rocks, each of which she has carefully resized so you can see just how big they are relative to each other:


Whoa. Look how big Lutetia, just visited by Rosetta, is compared to everything else! And yet, at 130 km across, it’s a dot compared to our Moon. In fact, you could smash together all the known asteroids in the main belt between Mars and Jupiter and they’d be far smaller than our rocky satellite.

Still, small doesn’t mean "uninteresting". These rocks in Emily’s diagram are all fascinating beasts, and the more we learn about them the more compelling they become. And there’s more to come, with the Dawn mission about to see the big asteroids Vesta and Ceres up close… and go read Emily’s blog about this to see how they’d fit on the diagram (hint, they don’t, and by a long shot). You’ll also find a much larger version of the diagram there, and you really, really should look at it. Wow.

CATEGORIZED UNDER: Astronomy, Pretty pictures

Rosetta sends back gorgeous asteroid closeups

By Phil Plait | July 13, 2010 7:00 am

The European space probe Rosetta passed about 3000 km from the asteroid Lutetia on Saturday, July 10, 2010, and it sent back incredible closeup images of the rock. Check ’em out below!


Emily Lakdawalla at the Planetary Society Blog has more details, as always.

Related posts:

Rosetta takes some home pictures
Rosetta swings past home one final time
Rosetta swings by Mars

CATEGORIZED UNDER: Astronomy, Pretty pictures
MORE ABOUT: asteroid, ESA, Lutetia, Rosetta

Live stream of Rosetta's July 10 asteroid flyby

By Phil Plait | July 9, 2010 12:30 pm

At 15:45 UTC tomorrow, July 10, the European Space Agency probe Rosetta will fly to within 3200 km (2000 miles) of the asteroid 21 Lutetia. This close pass will reveal, for the first time, the shape and details of this roughly 100-km-diameter rock.

You can watch this event live as it happens; ESA is streaming the event. Around 01:00 UTC they’ll start presenting the images, too. Below is an embedded feed that will go live once the actual stream starts.

I’m very excited about this! This is all happening during TAM 8, but I’ll try to watch it live if I can too.

CATEGORIZED UNDER: Astronomy, Cool stuff
MORE ABOUT: ESA, Lutetia, Rosetta

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