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SpaceX’s new ‘Endeavour’ spaceship is poised to make history after undocking from the International Space Station with 2 NASA astronauts aboard

FREE Cape Cod News by FREE Cape Cod News
August 2, 2020
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SpaceX's new 'Endeavour' spaceship is poised to make history after undocking from the International Space Station with 2 NASA astronauts aboard thumbnail
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  • SpaceX has entered the final stage of its historic first flight of people: NASA astronauts Bob Behnken and Doug Hurley are on their way home.
  • Behnken and Hurley boarded the company’s new Crew Dragon spaceship on Saturday, undocked from the International Space Station, and flew away.
  • The crew is now targeting a landing of their ship, which they named “Endeavour,” in the Gulf of Mexico on around 2:48 p.m. ET on Sunday. 
  • Elon Musk, the founder of SpaceX, has described the landing phase as his “biggest concern” for the mission.
  • Visit Business Insider’s homepage for more stories.

Bob Behnken and Doug Hurley are on their way home.

The two NASA astronauts departed the International Space Station on Saturday evening, beginning a roughly day-long voyage back to their families on Earth.

Behnken and Hurley left in a vehicle called Crew Dragon “Endeavour,” a spaceship designed, built, and operated by SpaceX with about $2.7 billion in government funding. It’s SpaceX’s second experimental flight of the vehicle, a mission called Demo-2, and the aerospace company’s first time putting people on board.

The Demo-2 mission’s departure makes SpaceX, founded by Elon Musk in 2002, the first company in NASA’s Commercial Crew Program to successfully pull off a visit to the $150 billion, football field-size laboratory.

But Behnken and Hurley’s return trip has just begun. Now that they’ve flown away from the ISS, they must perform a risky descent through Earth’s atmosphere — the phase of the flight that Musk has called his “biggest concern.”

If the flight successfully lands on Sunday afternoon, it would be the first crewed American spaceship to leave and return to Earth since July 2011, when NASA retired its space shuttle program.

The beginning of the end to an historic 63-day mission

spacex crew dragon endeavour astronauts touch screen nasa astronauts bob behnken doug hurley

NASA astronauts Bob Behnken and Doug Hurley prepare to depart the International Space Station aboard SpaceX’s Crew Dragon spaceship on August 1, 2020.

NASA


Behnken and Hurley launched to orbit on May 30 and docked to the ISS a day later, beginning their historic 63-day mission chockful of science, space station maintenance, and breathtaking views of Comet Neowise.

But all good things must come to an end, and the crew began loading supplies, experiments, and personal effects — including an historic American flag — into Endeavour early Saturday morning.

Once they were packed up, they said goodbye to the ISS crew members they lived and worked with for two months: NASA astronaut and station commander Chris Cassidy, and Russian cosmonauts Anatoly Ivanishin and Ivan Vagner.

Behnken and Hurley then climbed into Endeavour, donned their spacesuits, closed the hatch, and began preparing to depart. At 7:35 p.m. ET, the spaceship gently shoved off the ISS with a series of small burps of propellant, right on schedule.

“Dragon departing,” Hurley said as Endeavour glided away.

“Dragon, SpaceX: Separation confirmed,” a mission controller responded on the ground.

The crew then fired departure burns to build up a protective “keep-out sphere” around the space station, to begin their journey in earnest.

“Safe travels, and have a successful landing. Endeavour’s a great ship. Godspeed,” a mission controller told the crew.

Hurley later tweeted his thanks to the space station crew, called Expedition 63, using Endeavour’s Wi-Fi.

“It was an honor and privilege to be part of Expedition 63,” Hurley said. “Now it’s time to finish our DM-2 test flight in order to pave the way for future Dragon crews. Go Endeavour!”

If all goes well — the path of Hurricane Isaias has allayed early concerns about the safety of landing near Florida — the astronauts will splash down in the Gulf of Mexico on Sunday at 2:48 p.m. ET.

To safely return to Earth, though, the astronauts must perform a series of critical maneuvers with Endeavour over the next 19 hours.

From 17,5000 mph to splash down

spacex crew dragon spaceship atmospheric reentry hot plasma heat shield earth return youtube sm

An illustration of SpaceX’s Crew Dragon spaceship returning to Earth with a blaze of plasma ahead of its heat shield.


SpaceX via YouTube



The first steps Behnken and Hurley took included firing the spaceship’s thrusters to slip into the correct orbit. NASA will perform more remotely while the astronauts sleep.

After they wake up on Sunday, the crew prepare for landing. Around 1:45 p.m. ET, according to a NASA TV schedule, the astronauts will jettison Endeavour’s cylindrical trunk. The heavy piece of hardware powered and helped navigate the ship in orbit, but isn’t needed during landing. Dumping the trunk is essential to exposing the heat shield of the aerodynamic crew capsule for the next stage of the flight.

Around 1:51 p.m. ET, they’ll need to fire Endeavour’s built-in thrusters for about 11 minutes to dramatically slow down the capsule, helping it fall from orbit and back to Earth. At this point, the heat shield must absorb blistering 3,500-degree-Fahrenheit heat that’s generated by plowing through the planet’s atmosphere at about 25 times the speed of sound.

It’s this phase that concerns Musk, SpaceX’s CEO and chief designer, more than any other.

“The part that I would worry most about would be reentry,” Musk told Irene Klotz of Aviation Week ahead of the launch in May.

The spaceship capsule has an asymmetric design to accommodate its emergency launch-escape system thruster pods. And the imbalance caused by those pods — though very unlikely to cause a problem — is the core of Musk’s concern.

“If you rotate too much, then you could potentially catch the plasma in the super Draco escape thruster pods,” Musk said, adding that this could overheat parts of the ship or cause it to lose control due to wobbling. “We’ve looked at this six ways to Sunday, so it’s not that I think this will fail. It’s just that I worry a bit that it is asymmetric on the backshell.”

When it’s about 18,000 feet above the water, Endeavour should automatically deploy a set of drogue parachutes and slow to about 120 mph. Around 6,500 feet, four large main parachutes should pop out and further decelerate Behnken and Hurley’s capsule before they splash into the ocean at around 15 mph. 

NASA and SpaceX are hoping to land Endeavour at a site off the coast of Pensacola, Florida, and immediately greet them with recovery boats and a helicopter that will whisk them back to land. If weather conditions turn poor near Pensacola, the astronauts will try to land at a backup site about 100 miles east, near Panama City.

SpaceX has five other potential landing sites, though Hurricane Isaias has knocked some out of contention. NASA’s landing conditions include wind speeds under 11 mph, no rain or lighting, and clear skies.

hurricane isaias nhc predicted path wind speed probabilities cone florida spacex demo 2 demo2 landing zones august 1 2020 dave mosher business insider google earth labeled

An August 1 map shows NASA and SpaceX’s landing zones for the Crew Dragon Demo-2 mission amid the estimated path and conditions of Hurricane Isaias. Pensacola (left) and Panama City (right) are indicated with a red arrow. The outer-edge green shows a 5-10% chance of sustained tropical storm-force winds.


Google Earth; NOAA; NASA; Business Insider



Along with trying to get home, Behnken and Hurley are performing an essential step in proving that SpaceX’s Crew Dragon ship is safe to fly people in the future, including private citizens. NASA and SpaceX plan to finish reviewing data from the experimental mission over the following six weeks, likely resulting in its crucial human-rated certification from the space agency.

In a future mission that NASA recently announced, astronaut Megan McArthur (who is married to Behnken) will ride the same Crew Dragon ship to orbit for a roughly six-month stay. 

Ahead of the Demo-2 mission, NASA estimated a roughly 1-in-276 chance of losing the crew at any point during the flight.

Watch NASA TV’s ongoing live coverage of Demo-2 mission:

Do you have a story or inside information to share about the spaceflight industry? Send Dave Mosher an email at dmosher+tips@businessinsider.com or a Twitter direct message at @davemosher. More secure communication options are listed here.

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