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Meteorologist / Science Writer
Wednesday 5 December 2018 5:43 PM – With NASA's OSIRIS-REx spacecraft coming to Last Determination, the Canadian flame is now in & # 39; going to map the big asteroid, a & # 39; Start with a possible one day, help us to save the world.
On Monday, December 3, after two years, and travel a distance of over 2 billion kilometers through space, the OSIRIS-REx terminal vessel arrives at the ultimate destination – a large asteroid 101955 Bennu .
This is not the case come ashore, such as NASA's InSight mission, which launched Mars & # 39; Elysium Planitia on November 26. Instead, OSIRIS-REx – a hare for Origins, Spectral Menterpretation, Resource Medentistry, SSecurity – Regolith ExBoòrr – drawing up and matching pace with the Bennu asteroid, at a distance of only 19 kilometers away.
Now, because it's going to & # 39; NASA's first close insight into the asteroid near this Earth, the spacecraft begins to start; mapping the surface features in detail by using a laser built by Canada.
Over the next year, OSIRIS-REx will connect closer links to Punch poles, and finally they will Come close enough to collect a collection of the surface of the asteroid, to return to us, here on Earth.
The OSIRIS-REx operation to Bennu, from 2.2 million kilometers on August 17, 2018 to just 65 km on November 27. Beliefs: NASA Space Space Conduct Center / University of Arizona
The contribution in Canada to the OSIRIS-REx mission is a device called the name OSIRIS-REx Laser Altimeter no OLA
OLA, which was provided for the campaign by the Spanish Spanish Association, especially in particular on finding footprints. It also works with a radar, but instead of clearing the waves of the target, it will use laser light.
As Setting moves under the spacecraft, OLA will shake the surface with its two lasers, and record the time the laser light gives to; Cover the speed to the target and back. Because the speed of the laser light is stable, the OLA science team can use these dimensions to get the true distance between spacecraft and asteroid surface, which allows them to build a 3D full map of the features of the asteroid.
The OLA scans are so tired of having a 7-inch pileapple map resolution, which is good enough to find individual stones on the surface of the asteroid!
CLICK TO MEADAN. Laser Canada makes an asteroid 3D map and out of the best sample site for the NASIR OSIRIS-REx mission. Credit: Canadian Spaniard Group
As shown in the graphic above, these are not rigorous engineers. In total, the instrument uses 75W power light power equivalent! This happens more than you could think. Read on, below, for why.
It was not delivered to & # 39; This part of the mission by the Canadian Spaniard. It is run by Canadian scientists as well!
Dr. Michael Daly is the fastest scientist for OLA of the University of York, with fellow scientists Dr Catherine Johnson, from the University of British Columbia, and Dr. Jeff Seabrook, who is also from York University.
WHAT IS A PHILOSOPHALLY BELOW?
If there is one item out of a room that has the highest interest from scientists at the same time, and has inspired the most uninhabited destinations, in the campaigns, it is an asteroid Determine what.
Found in 1999, this corridor is a half-kilometer wide in the current location that replaces a second-to-a-top place on NASA's Sentry risk register – The list of asteroids near Earth, which may be a dangerous one that looks closely, because at least some opportunity, however, is small, that they can, in some way, affect on Earth.
The reputation is & # 39; This has prioritized in the scientific community, but it has also been on the # 39; Split the asteroid to the media attention, until it occurs occasionally to appear in tablaid articles, with a clan chief who tells us how this is unavoidable.
Why is the asteroid # 2 threatening a lot of attention?
Although the main asteroid on the list, which is 29075 (1950 DA), is bigger and faster, thus causing much more seriously affected, this item has only one special event on Earth – on March 16, 2880. Determine, on the other hand, to make a story more rigorous when you are. Try to set up asteroid threats from the place.
This animation of Setup was captured by OSIRIS-REx cameras when the spacecraft was approximately 80 kilometers away from the asteroid. It shows a total distribution of Bennu, over 4 hours and 18 minutes. Belief: NASA Space Goddard Space Flight / University of Arizona
Not only is Bennu enough enough to make a big difference if it hit us, but also through a series of meetings with Earth, each of which causes the asteroid to be more closer and closer to all subsequent close events, of 78 different effects between the years 2175 and 2199.
Note: Although this is a really distinctive thing about Bennu, which is important to remember that the maximum possible chance of the potential effects – on September 24, 2196 – only 0.0094% of the opportunity to be & # 39; hitting the Earth. No, to put it another way, 99,9906% still has the chance to lose it! Even the gradually impact of their impact; At all 78 events, together, only 0.037 per cent have a chance of impact (or a 99.963 per cent chance required). So, we do not speak in doubt, here, with any part of the imagination! That's just that, with what's going on. Getting involved – an extensive devastation on Earth's surface – these are even those difficulties for NASA to take advantage, and there may be something about something.
Everything begins in 2060, when Bennu is saved over the Land at a reasonable distance of about 750,000 km, or just under twice a speed to its. Moonlight. That is totally safe, but at that time, it is expected that the Earth's landscape will have a small impact on Bennu, so when it comes back for its closest way to September 25, 2135, when which asteroid knows we have passed within orbit of moon, there is some uncertainty about it directly How many inside an orbit it will be. It could be around 300,000 km away (about 80 per cent the distance to the distance), or could reach as close to 100,000 kilometers (less than 1/3 the distance to his / her).
The 2135 also passes completely safe, with the way. There is no chance that the asteroid will have the Earth collision at that time, even though it's a? passing inside an orbiting moonlight. However, there is scope, depending on how close it is to come to us, it will be travel through what is called audio clauses & # 39; – a small place in a place, created by the attractive attraction between Bennu and Earth, which could significantly alter the orbit of the asteroid.
If Setting is going through one of the & # 39; These large small stones, the change in the orbit may be sufficient to achieve one of the potential effects of 2175 to 2199.
There is a lot of uncertainty and yes & # 39; Involvement in the future, but this is something that OSIRIS-REx helps us to help resolve that uncertainty.
The main aims of the seagull are to determine and determine mapping; return home samples, but also collect information that will help us to monitor the shape of the asteroid more precise, and give us a vision that will allow us to erase the asteroid (and others like it), what we need to do at any time in the future.
In any way OSIRIS-REx can help to protect Earth from effects by analyzing how Setting is removable as it is in a position; including sunlight and heat transfer from the surface. Does her change change? Does her orbit change, even in the least?
These types of changes are the result of those described as & # 39; Yarkovsky's impact
We do not see it in everyday life, here on Earth, because there are too many competitors (hate, anti-sound, anti-sound), but everything that gives light to & # 39; adversely affect each photon. leaving its surface. This is called radical pressure, and it is caused by the photocopy to reproduce it as it is; left the roof of the building, which – as a result of the Third Law of Newton – its output in & # 39; equal answer to face, a & # 39; Increase the momentum of the building opposite the way the photon was released.
Out-of-space, far from competing important forces, this exchange can have a greater impact, especially on something like an asteroid that is, move.
As an asteroid as Determination that includes solar radiation on the outside of the sun, it will & # 39; Photons open openly from the surface (ie: heat), all parts of the mole that the asteroid gives to photon efficiently and; affecting the asteroid. Because it takes time for the sunscreen to be taken to be reconstituted as a heat, the pipes are stronger than the photons. left from parts & evening & # 39; and evening & # 39; of the asteroid. In total, this means that the item & # 39; hitting her on the tip of her burn, as well as sunrise. So over time, the Bid orbit will move slowly away from the sun. If Bennu had to move on the other side, it would be a & # 39; move into, to the sun.
Look below to see the impact of Yarkovksy, and how OSIRIS-REx will help
As close to Bennu, OSIRIS-REx can carefully monitor the asteroid orbital route and a limit level, to see how they can change over time.
The data that sends a spacecraft may restart us to go to # 39; Developing ways to use Yarkovsky's impact, and so on; allows us to protect Earth from an asteroid risk.
Do not erase asteroids up with nuclear weapons, or not; putting people (oil drills) to put bombs into them. Instead, a strategic spacecraft can be used designed to make changes to the route that brings a dangerous asteroid into and spreads light, Spreading different materials on the surface, or by changing what the sun is doing; reaching the asteroid. So, we would use the principles of radical pressure and the impact of Yarkovsky for our benefits, make the asteroid look out of their effects, and pass on safely on us.
Sources: NASA NASA | CSA
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