Chapter 413

Christmas passed.

It means that New Year's Day is coming.

A new year is just around the corner.

However, before starting 2019, there is still an important thing waiting for Gu Lu.

That is the work of the Chang'e-4 probe landing on the moon.

On the afternoon of December 26.

Christmas has just passed the first day.

On campus, the atmosphere of New Year's Day is very strong.

Everyone had a happy smile on their faces.

And at this time.

Gu Lu received a call from Wu Zheng again.

"Professor Gu, I still need to trouble you to come here again tonight!" Wu Zheng said with a smile.

Gu Lu responded directly, "It is incumbent!"

"I'll ask the driver to pick you up, and you'll just wait at the school gate. ”

"No problem. ”

"Then Professor Gu, that's it, let's meet and talk again in the evening, I still have a lot of things to deal with here. As the chief engineer of the Chang'e-4 lunar exploration program, Wu Zheng is still very busy.

"You're busy, I'll be there on time in the evening. After saying this, Gu Lu took the initiative to hang up the phone.

Gu Lu came all the way to the office of the research institute, pushed open the door of the cubicle and walked in.

Simon was holding the shower to water the pot of violets.

Seeing Gu Lu suddenly push the door in, he asked with a little confusion, "What are you doing in such a hurry?"

"I'm going out tonight. Gu Lu went straight to the point and told Simon the news.

"Still going out?" Simon was stunned for a moment and put down the shower, "Are you going to ...... with that girl named Su Xi?"

As soon as Simon was halfway through his words, he was so frightened by Gu Lu's stunning eyes that he covered his mouth.

Simon vaguely remembered that Gu Lu had told him that if he gossiped about the relationship between Gu Lu and Su Xi again, he would send him to that kind of place.

"Simon, in fact, if you want to go to the duck farm, just tell me directly, don't beat around the bush!" Gu Lu stared at Simon with a smile.

Simon subconsciously took a step back, "Gu Lu, I was wrong!"

"If you're wrong, remember not to mention it later. Gu Lu pulled a chair and sat down in front of Simon, without holding on.

"Anyway, I have something very important to go out tonight, so you can take out the supper. Don't wait for me, because this time I don't think I'll be back until tomorrow morning at the earliest. ”

The lunar landing phase of the probe is quite cumbersome.

If everything goes well, it will take at least five or six hours.

And once the unexpected happens, it's hard to say when this time comes.

After listening to Gu Lu's instructions, Simon nodded very obediently, "I know." ”

............

Eleven p.m.

Gu Lu got into the familiar black car.

Half an hour later.

Gu Lu came to the headquarters building of the China National Space Administration again.

After some document checks, the driver Xiao Liu smoothly took Gu Lu to the ground command center of the lunar exploration program on the 28th floor.

When Gu Lu walked into the command center, he saw Wu Zhengzheng staring at the big screen in front of him without blinking.

Gu Lu looked up.

In the big screen, the Chang'e-4 probe has completed a four-day and 96-hour Earth-Moon transfer journey.

At present, it has entered the near-moon braking phase.

To put it simply, it is to use the reverse thrust of the engine to achieve the deceleration of the detector.

Next, the probe, which has slowed down to a certain value, is pushed into a circumlunar orbit with a perilunar point of 100 kilometers.

The probe will then orbit the moon in this circumlunar orbit.

"Orbit correction!" Wu Zheng, who was standing in front of the command platform, said these four words in a deep voice.

"The third orbital correction is completed with an error of 0.00012 degrees. The data monitor on the side reported the data.

This error is within the fault tolerance range.

The atmosphere in the command center was silent for a few seconds, and Wu Zheng held the microphone and said in a serious tone, "Start slowing down!"

"Yes!"

The data parameters of the probe's near-moon braking were calculated in advance by Gu Lu.

It has long been fed into the GNC system program of the detector.

Now the command center can't interfere with anything, so it can only wait quietly for the result.

In the large screen, the braking link of the near moon began.

The whole process is strictly carried out in accordance with the various data provided by Gu Lu.

Minutes and seconds, how much thrust is the engine, and what is the angle of thrust.

All these data were accurately calculated by Gu Lu, and the score was exactly right.

The speed of the Chang'e-4 probe was slowed down little by little.

More than twenty minutes later......

The Chang'e-4 probe dropped to 7.8 km/s, and at the same time, after a series of successive decelerations, the probe was only 100 kilometers away from the moon!

This distance is exactly the value of the expected orbit around the moon.

In the large screen, it can be clearly seen that the Chang'e-4 probe was successfully captured by the moon after completing the near-moon braking.

The probe began orbiting around the Moon with a perilunar point of 100 km and an apogee of 400 km.

A burst of cheers erupted from the entire ground command center.

At the same time, Gu Lu, who was standing at the door, let go of his clenched hands, and a relaxed smile appeared on his face.

All the parameters of the entire near-moon braking link are all set by Gu Lu.

If something goes wrong in this link, then he will definitely blame himself for the rest of his life.

............

"Chief Engineer Wu, congratulations!" Gu Lu smiled and shook hands with Wu Zheng, who was full of smiles.

The braking link in the near month was successfully completed.

It was only one last problem before the probe landed on the moon.

"Thanks to Professor Gu, the data you calculated!" Wu Zheng thanked Gu Lu with a smile.

Without Gu Lu's accurate data, the entire near-moon braking process would not have been so smooth.

This made Wu Zheng feel more and more that it was a wise decision to bring Gu Lu in the first place.

Gu Lu and Wu Zheng blew each other's rainbow farts into each other.

The next second.

The expressions of the two of them became serious at the same time.

Both of them knew that a more difficult stage was yet to come.

The probe went through six stages on the far side of the moon, and the official landing on the far side of the moon is the most difficult link in the entire lunar exploration project.

Any slight accident can lead to the failure of the moon landing process.

If any link is wrong, the Chang'e-4 probe may turn into a flaming fireball and fall to the moon.

Now, it's not time to celebrate.

"When does the moon setting phase begin?" Gu Lu asked.

"It's going to take a while. Wu Zheng pointed to the picture presented on the large screen, and said in a solemn tone, "We need to measure some values when the probe runs to the far side of the moon, and then determine the location where the probe lands." ”

"What is the signal delay of the relay star?" Gu Lu asked another question.

"Four minutes and thirteen seconds. Wu Zheng smiled helplessly, "This means that everything in the far side of the moon will take us four minutes and thirteen seconds before we receive the picture." ”