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Meteorologist / Science writer
Wednesday, December 5, 2018, 5:43 AM – When NASA's OSIRIS-REx spacecraft finally arrives at Bantu, a Canadian laser will work on mapping the horrible asteroids one day to begin the mission of saving the world.
On October 3, Monday, he spent more than two years and travels more than 2 million kilometers in space, the OSIRIS-REx spacecraft finally reached the finish line – 101955 Bennu, a large asteroid.
This is not landing, Like NASA's InSight mission, on March 26 at Mars's Elysium Planitia. Instead, OSIRIS-REx – is short Origins, Spectral Interpretation, Resource Identification, Sequity – Regolith exAizkorri – Benga joins the speed with the asteroid, 19 kilometers away.
Now, as NASA provides the nearest approach to this near-Earth Asteroid, the spacecraft determines the characteristics of the surface detail using Canadian-built lasers.
The following year, OSIRIS-REX will continue to approach the Bunga's poles flybys, and it will be enough to gather a sample of the surface of the asteroid, to return to us here on earth.
Approaching OSIRIS-REx in Bennu, 2.2 million km, on August 17, 2018, 65 km, November 27. Credits: NASA's Goddard Space Flight Center / University of Arizona
LASER MAPPING ASTEROID
The Canadian contribution is for OSIRIS-REx mission OSIRIS-REx Laser Altimetry or OLA
OLA, the Canadian Space Agency, was a laser search engine. It works as a radar, but it bounces off radio waves outside of that target, it uses a light laser.
While rotating while under the spacecraft, OLA covers two lasers with the surface and the laser light covers the target and the backward distance. Since the speed of the laser light is constant, the OLA team of scientists can use these timed measurements to obtain the exact distance between the spacecraft and the asteroid, forming a 3D map of the asteroid characteristics.
The OLA scans are so good that the result maps will have a 7-cm-pixel resolution to select stone stones on the surface of asteroids.
CLICK TO ENVELOPE. A Canadian laser will have an 3D map of an asteroid and the NASA's OSIRIS-REx mission is the best sampling site. Credit: Canadian Space Agency
As shown in the figure above, there are high-intensity lasers. In total, the instrument uses the equivalent power of the 75W bulb! Think more than you think. Read, below, why.
The parts of this mission were not only provided by the Canadian Space Agency. Canadian scientists also use it!
OLA's scientific director is a PhD from Michael Daly York University, Dr. Columbia Johnson, British Columbia University and Jeff Seabrook, along with PhDs from PhDs from the University of York.
WHY DO YOU REACH?
When an object in space is triggered by interest in scientists at the same time, tabloid titles are more audible, it is a Bantu asteroid.
This discovery discovered in 1999 covers half the width of space wastes that currently reside in NASA's Sentry Risk Table transfer. A list of asteroids around the Earth is very close. , at least, because there are few possibilities, even small ones, on the day that can affect the Earth.
"This distinction" has given priority to the scientific community, but the asteroid has also taken the focus of the media, because it has appeared on the tabloid articles regularly, because we owe this object to our inevitable devotion.
Why is the # 2 asteroid threat out so much attention?
The main asteroid in this list, known as 29075 (1950 DA), is a larger and faster one, although it can cause a lesser impact, this object only has specific sources close to the Earth: March 16, 2880. Bantu On the other hand, it makes a little more history story when trying to spread asteroids threats from space.
This Bennu animation was captured by OSIRIS-REX cameras, the spacecraft was 80km from the asteroid. She shows the whole tour of Bennu for 4 hours and 18 minutes. Credit: NASA's Goddard Space Flight Center / University of Arizona
It's not enough to do it but it can cause great damage, but it also makes Earth encounters. Thus, the asteroid would be closer and closer to each of the next meetings, with a total potential impact between 2175 and 2199 between 78 years.
Note: In spite of the fact that it is not related to Bennu, it must be remembered that it is the most likely "possible" of these possible impacts, on September 24, 2196, with only 0.0094 percent of the Earth's crash. Or, in other words, it will not lose 99.9906 percent chance! Even if accumulated The probability of affecting 78 events, together, could affect 0.037 percent (or 99.963%). So, we do not speak at all in any part of the imagination! Thus, given the possible destruction of the Earth's surface, NASA is advised to warn you that it may take some time.
It begins in 2060, about 750,000 kilometers from Bennu to the south of the Earth, or a little less than the distance from the Moon. This is completely safe, but at that time, due to the gravity of the Earth, Bennu should be given a little closer to the next nearest on September 25, 2135, when the asteroid flies in the past Through the moon's orbitThere is little precision how much It will be in the moon's orbit. 300,000 km (80% of the distance to the moon), or 100,000 km (less than 1/3 of the distance to the moon).
The passage 2135 is completely safe, by the way. There is no asteroid in the Earth to be victorious, even though it is passing through the Moon's orbit. The possibility is that, as it is close to Bennu, it will fly through the "gravitational brace", forming a tiny space, forming a gravitational attraction between Bennu and the Earth. Asteroid orbit can cause major changes.
If Bennu passes some of these kidneys, the change in his or her may be sufficient to affect the potential effects between 2175 and 2199.
There are some doubts and & # 39; ifs & # 39; Whoever participates in Bennuor's future, but that OSIRIS-REX really helps us to solve these uncertainties.
First space missions translate Bennu map and home samples, but they will also gather information that will help us monitor the asteroid's orbit, and I like asteroids (and others) in the future.
OSIRIS-REx is a way to help protect the Earth's impact in a way, as Bennu reacts, it is analyzed according to the surface that emits sunlight and which emits heat. Is it rotating? Does the orbit change even the smallest?
These types of changes have the effect "Yarkovsky" & # 39; They are the result of what is called
We do not see it in everyday life, here on Earth, because there are too many forces to compete (gravitations, friction, air resistance), but any light emitting light has a very poor "boost" for each photon. It is known as the pressure of radiation, and this photon avoids the surface of the object, due to the Newton's Third Law, that "the same and the opposite reaction" increases the object's impetus. emitted by photon.
In space, far away from the strongest competitor, this momentum may have an impact, especially in an object that rotates the asteroid.
When an asteroid like Bennu destroys its solar radiation and emits infrared photos (that is, heat), the asteroid is triggered by a single photon that pushes the asteroid "efficiently" into the asteroid. Since sunlight radiation can be radiolabelled as heat, the strongest "push" of the pictures that emerge is between the "afternoon" and "afternoon" asteroids. In general, the object "pushes" toward its orbit, even outside the Sun. Then, with time, the spirals slowly move away from Sun from the Bennu orbit. If he turned to the opposite direction, the spiral would enter into Sunrise.
Check the bottom Yarkovksy effect to see the action, and how to help OSIRIS-REX
To be as close as possible, OSIRIS-REx can keep track of the orbital path and rotation rate to see how it can change over time.
When it is sent to space, it will help us develop some methods to take advantage of the Yarkovsky effect, thus allowing Earth as a threat to the asteroid threat.
Forget nuclear nukes or throw people (oil drills) for bombs. Instead, a robotic space can be deployed that allows the absorption and illumination of dangerous asteroids, by spraying different materials when the surface or rays of the sun reaches the asteroid. In this way, the principles of radiation pressure and Yarkovsky effect would be used with our advantage, thanks to the route that can affect the impact of asteroids and safely.
Sources: NASA | NASA | CSA
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