How to target an asteroid

Apr 17, 2013
How to Target an Asteroid
This spectacular image of comet Tempel 1 was taken 67 seconds after it obliterated Deep Impact's impactor spacecraft. Credit: NASA/JPL-Caltech/UMD

(Phys.org) —Like many of his colleagues at NASA's Jet Propulsion Laboratory, Pasadena, Calif., Shyam Bhaskaran is working a lot with asteroids these days. And also like many of his colleagues, the deep space navigator devotes a great deal of time to crafting, and contemplating, computer-generated 3-D models of these intriguing nomads of the solar system.

But while many of his coworkers are calculating asteroids' past, present and future locations in the cosmos, zapping them with the world's most massive radar dishes, or considering how to rendezvous and perhaps even gently nudge an into , Bhaskaran thinks about how to collide with one.

"If you want to see below the surface of an asteroid, there's no better way than smacking it hard," said Bhaskaran. "But it's not that easy. Hitting an asteroid with a spacecraft traveling at hypervelocity is like shooting an arrow at a target on a speeding race car."

The term hypervelocity usually refers to something traveling at very high speed—two miles per second (6,700 mph / 11,000 kilometers per hour) or above. Bhaskaran's hypothetical impacts tend to be well above.

"Most of the hypervelocity impact scenarios that I simulate have spacecraft/asteroid closure rates of around eight miles a second, 30,000 miles per hour [about 48,000 kilometers per hour]," said Bhaskaran.

In the majority of our solar system, where yield signs and "right of way" statutes have yet to find widespread support, hypervelocity impacts between objects happen all the time. But all that primordial violence usually goes unnoticed here on Earth, and almost never receives scientific scrutiny.

"High-speed impacts on asteroids can tell you so many things that we want to know about asteroids," said Steve Chesley, a near-Earth object scientist at JPL. "They can tell you about their composition and their structural integrity—which is how they hold themselves together. These are things that are not only vital for scientific research on the origins of the solar system, but also for mission designers working on ways to potentially move asteroids, either for exploitation purposes or because they may be hazardous to Earth."

Hypervelocity impacts by spacecraft are not just a hypothetical exercise. Scientists have taken the opportunity to analyze data from used spacecraft and rocket stages that have impacted the moon and other celestial bodies since the Apollo program. On July 4, 2005, 's Deep Impact spacecraft successfully collided its dynamic impactor with comet 9P/Tempel 1—it was the first hypervelocity impact of a primitive solar system body.

Bhaskaran, who was a navigator on Deep Impact, would be the first to tell you that not all hypervelocity impacts are created equal. "Impacting an asteroid presents slightly different challenges than impacting a comet," said Bhaskaran. "Comets can have jets firing material into space, which can upset your imaging and guidance systems, while potential asteroid targets can be as small as 50 meters [164 feeet] and have their own mini-moons orbiting them. Since they're small and dim, they can be harder to spot."

Along with the size of the celestial body being targeted, Bhaskaran also has to take into account its orbit, targeting errors, how hard an impact the scientists want, and even the shape.

"Asteroids hardly ever resemble perfect spheroids," said Bhaskaran. "What you've got floating around out there are a bunch of massive objects that look like peanuts, potatoes, diamonds, boomerangs and even dog bones—and if the spacecraft's guidance system can't figure out where it needs to go, you can hit the wrong part of the asteroid, or much worse, miss it entirely."

The guidance system Bhaskaran is referring to is called "AutoNav," which stands for Autonomous Navigation. To reach out and touch something that could be halfway across the and traveling at hypervelocity requires a fast-thinking and fast-maneuvering spacecraft. It is a problem that even the speed of light cannot cure. "When it comes to these high-speed impact scenarios, the best info you get on where you are and where you need to be comes very late in the game," said Bhaskaran. "That's why the last few hours before impact are so critical. We need to execute some final rocket burns, called Impactor Targeting Maneuvers (ITMs), quickly. With Earth so far away, there is no chance to send new commands in time.

"So, instead, we have AutoNav do the job for us. It is essentially a cyber-astronaut that takes in all the pertinent information, makes its own decisions and performs the actions necessary to make sure we go splat where we want to go splat."

Currently, Bhaskaran is running simulations that make his virtual impactor go splat against the furrowed, organic-rich regolith of asteroid 1999 RQ36. The 1,600-foot-wide (500-meter-wide) space rock is the target of a proposed JPL mission called the Impactor for Surface and Interior Science (ISIS). The impactor spacecraft, which looks a little like a rocket-powered wedding ring, would hitch a free ride into space aboard the rocket carrying NASA's InSight mission to Mars. The impactor's trajectory would then loop around Mars and bear down on RQ36.

"One of the things that helps me sleep at night is that we know a lot about RQ36 because it is the target of another NASA mission called OSIRIS-REx," said Bhaskaran. "But it also provides some challenges because the scientists want us to hit the asteroid at a certain moment in time and at a certain location, so that the OSIRIS-REx spacecraft can be sure to monitor the results from a safe vantage point. It is a challenge but it's also really exciting."

The part of the ISIS mission Bhaskaran is most interested in is what happens after our rocket-festooned, cyber-hero rounds Mars and begins to close the distance with the asteroid at a speed of 8.4 miles per second (49,000 kilometers per hour). Over the next several months, the mission navigators would plan and execute several deep space maneuvers that refine the spacecraft's approach. Then, with only two hours to go, AutoNav would take over to make the final orbital changes.

"AutoNav's imaging system and its orbit determination algorithms will detect the asteroid and compute its location in space relative to the impactor," said Bhaskaran. "Without waiting to hear from us, it will plan for and execute three ITMs at 90 minutes, 30 minutes and then three minutes out. That last rocket firing will occur when the asteroid is only 1,500 miles [2,400 kilometers] away. Three minutes later, if all goes according to plan, the spacecraft hits like a ton of bricks."

While Bhaskaran loves ISIS for the navigation challenge it provides, the proposed mission's principal investigator likes what the out-of-this-world equivalent of the release of nine tons of TNT does to the surface—and interior—of an asteroid.

"We expect the crater excavated by the impact of ISIS could be around 100 feet across," said Chesley. "From its catbird seat in orbit around the asteroid, OSIRIS-REx, at its leisure, would not only be able to determine how big a hole there is, but also analyze the material thrown out during the impact."

The data would not only provide information on what makes up the asteroid, but how its orbit reacts to being hit by a NASA spacecraft.

"While the effect of ISIS on the orbit of asteroid 1999 RQ36 will be miniscule, it will be measurable," said Chesley. "Once we know how its orbit changes, no matter how small, we can make better assessments and plans to change some future asteroid's orbit if we ever need to do so. Of course, to get all these great leaps forward in understanding, we have to hit it in the first place."

Which leads us back to Bhaskaran and his hard drive laden full of hypervelocity impact simulations.

"We have confidence that whenever called upon, AutoNav will do its job," said Bhaskaran. "The trick is, we just don't tell AutoNav it's a one-way trip."

Bhaskaran will present his latest findings on guidance for hypervelocity impacts on Tuesday, April 16, at the International Academy of Astronautics' Planetary Defense Conference in Flagstaff, Ariz.

NASA detects, tracks and characterizes asteroids and comets passing relatively close to Earth using both ground- and space-based telescopes. The Near-Earth Object Observations Program, commonly called "Spaceguard," discovers these objects, characterizes a subset of them, and predicts their paths to determine if any could be potentially hazardous to our planet.

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antialias_physorg
1 / 5 (1) Apr 17, 2013
In the majority of our solar system, where yield signs and "right of way" statutes have yet to find widespread support

The more massive object has the right of way. Simple.

and even dog bones

Does a dog bone look different from other bones?

you can hit the wrong part of the asteroid, or much worse, miss it entirely

I may be missing something here. But asteroid paths are pretty predictable in the day (or even week/month) range. It only gets (slightly) less accurate in the month/year range. And it's not like on Earth where any number of spontaneous/extraneous factors can screw up the trajectory. Is it really so hard calculate items a ballistic collision course in space?
Birger
5 / 5 (1) Apr 17, 2013
"Is it really so hard calculate items a ballistic collision course in space?"
When you observe an asteroid you only get a single pixel, you have to draw conclusions about the diameter from the ratio of optical reflected light and its IR emissions. And to estimate shape, you investigate the light curve as the object rotates.

To pinpoint position, you take several pixels seen at different times until the position can be calculated as a mathematical point that hopefully is within the small asteroid (the resolution of telescopes is too low, the pixels represents a region much bigger that the actual asteroid).
GSwift7
5 / 5 (1) Apr 17, 2013
Is it really so hard calculate items a ballistic collision course in space?


and

When you observe an asteroid you only get a single pixel, you have to draw conclusions about the diameter from the ratio of optical reflected light and its IR emissions


In some cases, we have much better than a single pixel. In the case above, we have an observatory on site, so we know a lot about it.

Here's the problem with irregular objects like asteroids:

Try taking a pencil and attatch something heavy to one end, then toss it up gently into the air with a slight spin. Notice how the pencil will rotate around the center of mass, not it's physical center. If you try to shoot the pencil, and you want to hit the heavy object you placed at one end, then the thing you're aiming for is traveling in a wobbly path. If you time it wrong, you'll pass through the path of the pencil at a time when there's empty space there. It's a difficult problem.
GSwift7
5 / 5 (1) Apr 17, 2013
continued:

In an extreme case, the center of rotation may not even be part of the solid object. This is the case with a boomerang, for example. If you target a boomerang from a distance and you target the center of rotation of the object as a whole, you will miss.

Another problem is that rotation can be irregular, if the object has spin elements in all three axis, which I think is probably the case most of the time, and the object is not a perfect sphereoid with uniform density. Most objects probably wobble around quite a bit in their path through space. The wobble probably isn't predictable very far in advance either, due to gyroscopic effects and the fact that we don't know much about the density/mass distribution of the object.
antialias_physorg
3 / 5 (1) Apr 17, 2013
When you observe an asteroid you only get a single pixel, you have to draw conclusions about the diameter from the ratio of optical reflected light and its IR emissions. And to estimate shape, you investigate the light curve as the object rotates.

Well yes...the point I was trying to make: on Earth you only have seconds/minutes to observe, precalculate the trajectory of an incoming missile. Then you launch and again only have seconds in which to adjust the interceptor's path.

In space you have weeks/months in advance to observe, track, average out/calculate the trajectory of an asteroid and set your impactor in motion. And then again you have days/weeks/months in which to fine tune the course of your impactor. This seems a lot less demanding from a software standpoint. Even taking odd shapes/rotations into account.
Lurker2358
1 / 5 (1) Apr 17, 2013
The Russian meteoroid was un-tracked until the fireball was seen.

Days, weeks, and months are clearly just fairy tales. If the space agencies told everyone how pathetic they really are at tracking city-buster sized rocks, it would cause a panic.
antialias_physorg
not rated yet Apr 18, 2013
The Russian meteoroid was un-tracked until the fireball was seen.

It was also way too small to merit an early deep-space intercept (about 15 meters).

When we're talking about the asteroids which are subject of such missions we're talking 100 meter diameter and up. Deep space missions are also something you have to prepare for - they're not "spur of the moment" actions like in Hollywood movies. So I'd say: this only applies to asteroids where we DO have weeks/months (to decades) worth of forewarning, observation and tracking data.
GSwift7
not rated yet Apr 18, 2013
If the space agencies told everyone how pathetic they really are at tracking city-buster sized rocks, it would cause a panic.


Only people who are prone to panic would panic. The Tunguska event covered 2150 square miles, and is a good example of the city buster objects we are talking about when we talk about the majority of undetected objects. 2150 sounds like a lot, but that equates to a radius of 26 miles. There would be some damage beyond that, but relatively minor. For comparison, an average size hurricane causes this kind of damage over a much larger area, and we get several landfalling hurricanes on an average year.

Another way to look at this is by comparing the blast zone to the total area of the Earth, which is about 197,000,000 square miles. So the blast zone of a city buster is about 0.00001 of the Earth's surface. That's one hundred thousandth of the surface. So that's your odds of being in the blast zone of a city buster the size of Tunguska.