Ebene News – CA – Chinese rocket stage set to reenter atmosphere around May 8 – SpaceNews

HELSINKI – A large rocket stage that launched China’s first space station last week is likely to re-enter the atmosphere around May 8 according to space beginnings followed by predictions

US Defense Department spokesman Mike Howard in a May 4 statement said, “US Space Command is aware of the location of the Chinese 5B Long March in space and follows it, but its exact point of entry into Earth’s atmosphere can only be identified within hours of its re-entry, scheduled for May 8”

“Until then, the 18th Space Control Squadron will be offering daily rocket body location updates to www.espace-pisteorg from May 4th We will provide additional information as it becomes available », Says the press release

The launch of the Long March 5B at the end of April 28 in the East succeeded in placing the 225-ton Tianhe Base Module into orbit.However, the Long March 5B first stage about 30 meters long and 5 meters in diameter also reached orbital speed rather than falling with a predetermined area downstream

The empty rocket body is now in an altitude orbit of 162 by 306 kilometers, according to US Space Tracking from the 18th Space Control Squadron, down from an initial orbit of 170 by 372 kilometers kilometers

Without the ability to restart its engines, the center stage will be driven towards Earth by increasing collisions with molecules in Earth’s atmosphere Atmospheric fluctuations and other variables along with the high stage speed mean that accurate predictions of when and where the stage will return is only possible a few hours before the event.

The orbital inclination of the Long March 5B main stage of 415 degrees means that the rocket body passes a little further north than New York, Madrid and Beijing and as far south as southern Chile and Wellington , in New Zealand, and could re-enter this area at any time

This morning’s time-dependent elevation data for Tianhe / CZ-5B objects Center stage orbit continues to slowly decay as expected imageTwittercom / E8EPJ9yzRu

A May 4 update from the aerospace company predicts the re-entry will take place on May 9 at 12:37 p.m. EST (4:37 a.m. universal time), with a margin of error of plus or minus 28 hours

Russian space agency Roscosmos also said on May 4 that its Automated Dangerous Outer Space Warning System (ASPOS OKP) indicated that the long march 5B was scheduled for an uncontrolled re-entry

Calculations by Russian experts indicate a re-entry window of 9 a.m. May 7 to 4 p.m. May 9 East, with more refined forecasts to follow in the coming days

China has yet to comment on the status of the 5B Long March The country is planning another 10 launches of various spacecraft and launchers to build its three-module space station in 2021-2022

China is currently preparing to send the Tianzhou-2 cargo spacecraft to Tianhe in the coming weeks using a Long rocket March 7 A first manned mission, Shenzhou-12, is expected to send three astronauts to the new orbital outpost in June

In particular, two other Long March 5B launches are expected in 2022 to send the Wentian and Mengtian experimentation modules to join Tianhe in orbit

It is not known whether the China Academy of Launch Vehicle Technology (CALT) which designed and manufactured the Long March 5B, is or has planned any modifications to the rocket or the launch profile that would allow the main stage to be to desorb or fall to Earth on a ballistic trajectory

The Long March 5B was specially designed to launch modules of the Chinese space station into low earth orbit A test flight in 2020 also saw the central stage reach its orbital speed This incident saw the scene return to the over the Atlantic Ocean and local reports suggesting that debris from this 20-ton stage appears to have survived re-entry and landed in the African nation of Côte d’Ivoire

Holger Krag, head of the European Space Agency’s space security program office, told SpaceNews that an average mass of around 100 tonnes enters the atmosphere uncontrollably per year

“It is always difficult to estimate the amount of surviving mass and the number of fragments without knowing the design of the object, but a reasonable” rule of thumb “is about 20 to 40% of the dry mass of the object. ‘origin, “Krag said

Unlike the older Long March series rockets, the Long March 5B center stage uses liquid hydrogen and liquid oxygen as fuel The older generation Long March 2, 3 and 4 series rockets use a toxic hypergolic propellant combination of hydrazine and nitrogen tetroxide, which would make the debris surviving re-entry potentially dangerous for anyone approaching. the pavement

Debris from Chinese rocket launches from inland space ports sometimes falls into populated areas China is supposed to take precautions against injury through safety advisories, evacuations and calculation of drop zones rocket stages, as well as experimenting with technologies including grid fins and parafoils

While much attention has been paid to the threat to people on the ground and in-flight aircraft from reentrying satellite and rocket components, the aerospace company raised the issue of pollution last year. due at the start of the school year

Chinese rocket, Chinese rocket

Ebene News – CA – The stage of the Chinese rocket is expected to enter the atmosphere around May 8 – SpaceNews

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