SpaceX and NASA still plan to fly astronauts home this weekend, but Hurricane Isaias could complicate landing

If all goes according to plan, NASA astronauts Bob Behnken and Doug Hurley will climb aboard their SpaceX Dragon spacecraft and undock from the station at about 7:34 p.m. Saturday and splashdown at about 2:42 p.m. Sunday, either in the Atlantic Ocean or the Gulf of Mexico.

Speaking to reporters from the space station Friday morning, the astronauts said they were watching the weather closely. “We won’t leave the space station without some good landing opportunities in front of us, good splashdown weather in front of us,” Behnken said.

With the storm predicted to churn up Florida’s Atlantic coast Sunday, just as the astronauts would be headed home, officials said that a Gulf landing would be more likely if they do proceed with a landing attempt. SpaceX has identified two landing sites off the Florida Panhandle near Panama City and Pensacola that could be targeted.

Kathy Lueders, the head of NASA’s human spaceflight program, wrote on Twitter Friday that the teams “have decided to move forward” with the splashdown Sunday, but that they would “continue to monitor weather.” NASA has said it and SpaceX would make a decision on a primary landing site about six hours before the undocking.

There’s no rush to bring the crew home, however, especially since it would be the first time NASA astronauts have splashed down at sea since Apollo-Soyuz, the joint U.S.-Soviet mission, in 1975.

The spacecraft can stay on the space station for up to about 120 days, and is only about halfway through that time frame. “The systems on Dragon are doing very well,” Steve Stich, NASA’s commercial crew program manager, said earlier this week. “The spacecraft is very healthy.”

He said the spacecraft was inspected using a robotic arm, and a team of engineers from NASA and SpaceX looked at the data. The “results were very favorable,” Stich said. “There were no areas on the vehicle that were of any concern for reentry.”

He said flight controllers would be patient for the most opportune moment, calm seas and gentle winds, ideally under 10 mph, before committing to a return.

“We have plenty of opportunities here in August, and we’re in no hurry to come home,” he said.

“We don’t control the weather and we know we can stay up here longer,” Behnken said. “There’s more chow. And I know the space station program has got more work we can do.”

The spacecraft has three days’ worth of “consumables,” oxygen, food and water, in case the spacecraft undocks but then needs to stay in orbit before committing to a return, officials said.

Behnken and Hurley lifted off on a SpaceX Falcon 9 rocket from the Kennedy Space Center on May 30, the first flight of NASA astronauts from U.S. soil since the space shuttle was retired in 2011. It also marked the first time a private company flew astronauts to orbit. Along with Boeing, SpaceX is under contract from NASA to develop spacecraft capable of flying people to the station. And this mission, known as Demo-2, is designed to test the Dragon spacecraft to ensure it operates properly before NASA allows the company to fly operational missions of astronauts to the station.

Like the launch, the return journey is a perilous one. The spacecraft will be traveling 17,500 mph and hit the atmosphere with such force that flames will engulf the capsule, testing the heat shield. As it gets closer to Earth, two drogue parachutes will deploy, and then four main chutes are to guide the spacecraft down to the sea, where rescue crews will be standing by.

In the case of an emergency, Air Force search and rescue teams as well as contractors from ManTech, a private security company, will be on standby with C-17 cargo aircraft to deploy to either the Gulf of Mexico and the Atlantic. Another team is posted in Hawaii to respond if the mission goes way off course and lands in the Pacific.

“If the spacecraft comes down where it is supposed to, in the condition expected, then SpaceX is 100 percent responsible for the recovery of the crew and the spacecraft,” said Mike McClure, a ManTech program manager who used to command the Air Force’s rescue detachment. “If, however, the spacecraft lands someplace else, or the condition of the spacecraft and the crew drives SpaceX or NASA to request [Department of Defense] assistance, then our team will spring into action.”

Despite the many challenges of a water landing, Hurley and Behnken said they were not concerned.

“Splashdown is closer than it was the last time we were asked questions about it,” Behnken said. “But I still don’t feel nervous about it. Really, we’re focused on the things that we’ll need to do to be as safe as possible as we come back.”

It’ll be a fairly long flight, some 18 hours between undocking and splashdown. And the astronauts will be busy monitoring the capsule’s systems, making sure everything is on track and operating properly.

But they’ll also have some time to get some rest.

“We’ll spend a good share of that sleeping,” Hurley said.

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