2020-10-22

After Japan, NASA probes also successfully logged asteroids today

By yqqlm yqqlm

NASA just landed a spacecraft on an asteroid today If everything goes according to plan, it will bring back some dust, dirt and pebbles samples from the asteroid’s surface.

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More than 200 million miles away, NASA and its engineering partner Lockheed Martin instructed the spacecraft to land on a site called Bennu (Bennu) asteroid (potentially dangerous asteroid) made a historic short landing on the surface of space rocks.

And within 5 to 10 seconds, the probe should have collected samples from the surface of the asteroid. It will bring samples from this planet back to Earth. On Tuesday night, it completed this”triggered” operation.

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US Eastern Time At 6:11 pm, when the earth received a signal that the spacecraft had reached the surface of Bennu, the control center burst into cheers and applause.

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The spacecraft is complete Completed the expected task, very amazing.

Flying target:

< p style=”text-align:justify”> NASA will announce on Wednesday local time whether Osiris-Rex has successfully collected space science samples. The target this time is to obtain at least one 2.1 ounce (60 grams) sample, which is about the quality of a small bag of potato chips.

In order to determine whether the sampling target is reached, in the next few hours, the Osiris-Rex detector will be moved to a safe location, and then its The robotic arm moves to a suitable position, takes a picture of the collector head, and weighs how much mass is inside.

Sampling process:

< p style=”text-align:justify”>First of all, the asteroid Bennu is like a pile of rubble, with rugged terrain and huge boulders everywhere.

Because there is a communication delay of about 18 minutes with the mission control center on Earth, the spacecraft basically operates autonomously, launching a tank through a robotic sampling arm The gas first destroys the surface of Bennu, and then enough to allow the sample to enter the top of the collector of the sampling arm.

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Osiris-Rex is designed to land on a flat, uniform surface, but Bennu has too many rocks, to be honest, there is no suitable space. Fortunately, Osiris-Rex seems to outperform its design in terms of precise navigation. This gave the mission confidence to try mobile sampling on a site called”Nightingale”, even though this site is only as large as a few parking spaces.

Considering the terrain, if Osiris-Rex clamps a boulder or touches an uneven surface at a strange angle, many things may go wrong. In fact, it is true, so Osiris-Rex will start preparing for a second attempt at one of the backup locations. The detector is equipped with three nitrogen cylinders, so there should be at least two chances of successful sampling.

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Why do you want to do this task:

of this task Research may be crucial in the next 100 years, because Bennu’s trajectory puts him at risk of hitting the earth.

Bennu is one of the most potentially dangerous asteroids, in The possibility of hitting the earth at some point in the 22nd century is high. Part of the scientific investigation is to understand its orbital trajectory, improve the probability of impact, and record its physical and chemical properties so that a measure to mitigate the consequences of impact can be formulated in the future.

The research (Bennu) has other important reasons:the data collected by NASA from it may help provide information for future asteroid mining missions.

Asteroids are ancient rock fragments left over when the solar system formed 4.5 billion years ago. Over time, the remnants of the rocky planets-Mercury, Venus, Earth, and Mars-coalesce into asteroids, where most of them remain in their original form.

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Finally, if Osiris-Rex is successfully collected, it will be included in the history of asteroid exploration along with Hayabusa and Hayabusa-2 in Japan. Hayabusa has successfully sampled and returned a small amount of material from the asteroid &34;Itokawa &34;, and Hayabusa-2 is sending back a large number of samples of space rock &34;Ryugu &34;.

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p style=”text-align:justify”>OSIRIS-REx has been orbiting Bennu since December 2018, scanning asteroids and collecting as much data as possible. It will leave in March 2021 and is expected to reach Earth on September 24, 2023 after collecting samples, landing in the Utah desert.