SpaceX Crew Dragon to Bring 2 NASA Astronauts Home



Two astronauts who took the first commercial trip to orbit are preparing to leave the International Space Station Saturday evening and are scheduled to return home on Sunday.

The astronauts, Robert L. Behnken and Douglas G. Hurley, traveled to the space station in May aboard a Crew Dragon capsule built and run by SpaceX, the private rocket company started by Elon Musk.

The Crew Dragon will undock from the space station at about 7:34 p.m. Eastern time on Saturday and, if the weather conditions remain favorable, splash down in the Gulf of Mexico off Pensacola, Fla., at 2:41 p.m. on Sunday, NASA announced.

A safe return would open up more trips to and from orbit for future astronaut crews, and possibly space tourists, aboard the spacecraft.

Isaias is forecast to sweep up along the Atlantic coast of Florida over the weekend. NASA and SpaceX have seven splashdown sites in the Gulf of Mexico and the Atlantic, but the track of the storm ruled out the three in the Atlantic.

“We have confidence that the teams on the ground are, of course, watching that much more closely than we are,” Mr. Behnken said during a news conference on Friday, “and we won’t leave the space station without some good landing opportunities in front of us, good splashdown weather in front of us.”

NASA Television broadcast a farewell ceremony on Saturday morning. Coverage of the undocking began at 5:15 p.m. and is to continue through splashdown.

Just before a final burn that will drop the Crew Dragon out of orbit on Sunday afternoon, it will jettison the bottom part of the spacecraft, known as the trunk, which will then burn up in the atmosphere.

At re-entry, the Crew Dragon will be traveling at about 17,500 miles per hour. Two small parachutes will deploy at an altitude of 18,000 feet when the spacecraft has already been slowed by Earth’s atmosphere to about 350 miles per hour. The four main parachutes deploy at an altitude of about 6,000 feet.

Once the capsule splashes in the water, it is expected to take 45 to 60 minutes to pluck them out.

Spacecraft can safely return to Earth in either environment.

During the 1960s and 1970s, NASA’s Mercury, Gemini and Apollo capsules all splashed down in the ocean while Soviet capsules all ended their trips on land. Russia’s current Soyuz capsules continue to make ground landings, as do China’s astronaut-carrying Shenzhou capsules.

When Boeing’s Starliner capsule begins carrying crews to the space station, it will return on land, in New Mexico. SpaceX had originally planned for the Crew Dragon to do ground landings, but decided that water landings, employed for the earlier version of Dragon for taking cargo, simplified the development of the capsule.

After launch, re-entry through Earth’s atmosphere is the second most dangerous phase of spaceflight. Friction of air rushing past will heat the bottom of the capsule to about 3,500 degrees Fahrenheit. A test flight of the Crew Dragon last year successfully splashed down, so engineers know the system works.

A successful conclusion to the trip opens the door to more people flying to space. Some companies have already announced plans to use Crew Dragons to lift wealthy tourists to orbit.



Sahred From Source link Science

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