The return time of the Shenzhou 17 crew and the launch time of the Shenzhou 18 manned spacecraft have attracted everyone's attention. According to the plan, Shenzhou-17 will return on April 30, and the Shenzhou-17 spacecraft successfully evacuated the space station assembly at 08:43 this morning, which means that the return time of Shenzhou-17 is getting closer and closer. At present, everything has been arranged at the Dongfeng landing site, waiting for the safe landing of the Shenzhou 17 crew.
The following brings the "Shenzhou 17 return time"
According to official media reports at 14 pm on April 30, the return time of Shenzhou 17 is expected to be more than 5 pm today, which is about the same as the return time of Shenzhou 17 revealed by the media before. Generally, the return of the Shenzhou manned spacecraft will be carried out during the day, which is conducive to the search and rescue work immediately after the landing of the return capsule. The usual search and rescue process is as follows:
First of all, the landing site of the Shenzhou-17 return capsule was determined
After the landing of Shenzhou 17, the staff will arrive at the scene as soon as possible. Check the situation of the return capsule first, then open the return capsule and carry the three astronauts out one by one. The first astronauts to appear were the commander, that is, Tang Hongbo, and then Tang Shengjie and Jiang Xinlin.
Secondly, the three astronauts left in a special car after leaving the capsule
The three astronauts left the Dongfeng landing site in one person and one car, and then arrived in Beijing by mission plane. Upon arrival in Beijing, they will enter a period of quarantine and recovery, undergo a comprehensive medical examination and health assessment, and arrange for recuperation, followed by a group meeting with the media.
The return of Shenzhou-17 will go through four stages and take about 50 minutes
The first stage: undergo braking derailment
The Shenzhou-17 manned spacecraft entered the return orbit from the original flight trajectory through attitude adjustment, braking, and deceleration.
Stage 2: Free Ride
After braking and deorbiting, the Shenzhou-17 return capsule will enter free taxi mode and descend freely in an unpowered flight state, which is caused by the earth's gravity. It's like the principle that an apple ripens on a tree, why does it fall downwards instead of falling upwards.
The third stage: re-entry
When taxiing to a distance of 145 km above the ground, the return capsule separated from the propulsion module. After entering the atmosphere, the propulsion module burned out due to air friction.
The fourth stage: parachute landing
When the re-entry capsule descends to a position of 10 kilometers from the earth, the guide parachute, the deceleration parachute, and the main parachute will open in turn, and the re-entry capsule will begin to decelerate. After the re-entry capsule lands, the positioning system and beacon equipment will all be turned on to facilitate the search and rescue personnel to determine the landing location of the Shenzhou-17 re-entry capsule.
In short, the return time of Shenzhou 17 has been determined, and it is expected to land at 5 p.m. on April 30. At present, the air search and rescue astronauts, the ground disposal and return capsule have been fully prepared, and we are looking forward to the smooth return of the three astronauts of Shenzhou 17 and celebrate May Day together!
#神舟十七号返回时间#