Station Crew Busy with Research as Managers Work Ax-1, Crew-4 Missions

Station Crew Busy with Research as Managers Work Ax-1, Crew-4 Missions

The SpaceX Dragon Endurance crew ship is pictured from a window aboard the SpaceX Dragon Endeavour crew ship.
The SpaceX Dragon Endurance crew ship is pictured from a window aboard the SpaceX Dragon Endeavour crew ship.

The four private astronauts from Axiom Space are now due to depart the International Space Station on Saturday night and return to Earth the next day. Four commercial crew astronauts are also looking ahead to their mission aboard the orbiting lab set to begin after the Axiom Mission 1 (Ax-1) crew departs.

NASA, SpaceX and Axiom Space are planning for the Ax-1 crew to undock from the station inside the Dragon Endeavour crew ship on Saturday at 6:35 p.m. EDT. Ax-1 Commander Michael Lopez-Alegria will lead Pilot Larry Connor and Mission Specialists Mark Pathy and Eytan Stibbe back to Earth inside Endeavour for a splash down at 1:46 p.m. on Sunday off the coast of Florida.

The SpaceX Crew-4 mission awaits its launch date as mission managers monitor weather conditions at the Ax-1 splashdown site and review mission data after Endeavour’s return. The Falcon 9 rocket that will the launch the Crew-4 astronauts to space inside the Dragon Freedom crew ship successfully fired its nine Merlin engines on Wednesday during its static fire test. In the meantime, Crew-4 Commander Kjell Lindgren with Pilot Robert Hines and Mission Specialists Jessica Watkins and Samantha Cristoforetti, continue training for their mission while in quarantine at the Kennedy Space Center in Florida.

Operations on the station continue normally, as the four Expedition 67 astronauts worked on an array of space research on Thursday. Commander Tom Marshburn of NASA joined ESA (European Space Agency) Flight Engineer Matthias Maurer for muscle measurements and ultrasound scans. The duo contributed to the Myotones human research experiment to understand how weightlessness affects the biochemical properties of muscles. NASA Flight Engineers Kayla Barron and Raja Chari collected blood and urine samples and stowed them in science freezer for future analysis for more insights into spaceflight’s impact on the human body. The quartet also checked out their Dragon spacesuits as they look ahead to their departure inside the Dragon Endurance soon after the Crew-4 astronauts begin their station mission.

The three cosmonauts living and working on the orbital lab focused on their suite of science and upkeep tasks. Veteran cosmonaut Oleg Artemyev studied piloting techniques that may be used on future planetary or robotic missions. Roscosmos Flight Engineer Denis Matveev attached a heart monitor to himself then photographed the condition of Russian module windows. Roscosmos Flight Engineer Sergey Korsakov pursued cardiac research during the morning before working on Russian life support and photography gear.

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Mark Garcia

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Station Crew Awaits Ax-1 Departure and Crew-4 Launch

Station Crew Awaits Ax-1 Departure and Crew-4 Launch

International Space Station Configuration. Six spaceships are parked at the space station including the SpaceX Dragons Endurance and Endeavour; the Northrop Grumman Cygnus space freighter; and Russia's Soyuz MS-21 crew ship and the Progress 79 and 80 resupply ships.
International Space Station Configuration. Six spaceships are parked at the space station including the SpaceX Dragons Endurance and Endeavour; the Northrop Grumman Cygnus space freighter; and Russia’s Soyuz MS-21 crew ship and the Progress 79 and 80 resupply ships.

The integrated NASA, Axiom Space, and SpaceX teams have agreed on a plan for the Axiom Mission 1 (Ax-1) crew to undock from the International Space Station at 8:35 p.m. EDT Saturday, April 23, for a splashdown off the coast of Florida about 1:46 p.m. Sunday, April 24. The decision was made based on the best weather for splashdown of the first private astronaut mission to visit the International Space Station and the return trajectory required to bring the crew and the SpaceX Dragon Endeavour spacecraft back to Earth safely.

NASA will provide live coverage of departure activities beginning at 6:15 p.m. Saturday, April 23, with hatch closure targeted for 6:30 p.m. Coverage will resume at 8:15 p.m. for the undocking. Teams will continue to monitor weather at the splashdown sites prior to undocking to ensure conditions are acceptable for a safe recovery of the Ax-1 astronauts and Dragon spacecraft.

NASA and Axiom mission planning prepared for the possibility of additional time on station for the private astronauts, and there are sufficient provisions for all 11 crew members aboard the space station. The Ax-1 crew continues to work through previously planned mission activities. The Ax-1 crew and Dragon spacecraft remain healthy.

The departure of Dragon Endeavour from the space station will clear the docking port for the arrival of Dragon Freedom and NASA’s SpaceX Crew-4 astronauts. The earliest potential launch opportunity for the Crew-4 mission is 4:15 a.m. Tuesday, April 26, with additional opportunities Wednesday, April 27, and Thursday, April 28. These launch opportunities are undergoing a more detailed program review to ensure they align with integrated operational timelines. The teams want to provide a two-day gap after Ax-1 return for data reviews from splashdown and to prepare for the Crew-4 launch, including the staging of recovery assets.

The Crew-4 astronauts spent last night at the Kennedy Space Center in Florida rehearsing the countdown to their launch inside the SpaceX Dragon Freedom, the company’s newest crew ship. Overnight, Crew-4 Commander Kjell Lindgren, Pilot Robert Hines with Mission Specialists Jessica Watkins and Samantha Cristoforetti, put on their pressure suits and entered their vehicle conducting a successful dry dress rehearsal. The Falcon 9 rocket, with the Freedom perched atop, stands at Launch Complex 39A.

Expedition 67 crewmates Raja Chari and Tom Marshburn, who are also the SpaceX Crew-3 commander and pilot respectively, spent a little time on Wednesday with their upcoming departure activities. The pair, along with Kayla Barron of NASA and Matthias Maurer of ESA, will wait for the arrival of their Crew-4 replacements before returning to Earth a few days later inside the Dragon Endurance vehicle. The four astronauts had a light-duty day on Wednesday scheduling in some housecleaning tasks.

Over in the Russian segment of the station, cosmonauts Oleg Artemyev and Denis Matveev wrapped up their post-spacewalk activities today stowing their tools and discussing the excursion with specialists on the ground. The duo kicked off a series of spacewalks on April 18 to configure the European robotic arm for operations on the Nauka multipurpose laboratory module. Roscosmos Flight Engineer Sergey Korsakov started his day with electronics and communications maintenance before studying future spacecraft and robotic piloting techniques in the afternoon.

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Mark Garcia

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