Crew Preps for Solar Array Jettison and Dragon Departure

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ROSA Jettison

The ROSA, Roll Out Solar Array, is pictured shortly after it was jettisoned from the tip of the Canadarm2.

An experimental solar array demonstration was jettisoned while the Expedition 52 crew continued preparing the SpaceX Dragon for its release on Sunday. The three crew members also studied how microgravity impacts their bodies.

Following a week of successful science operations on the experiment for the Roll-Out Solar Array (ROSA), attempts to retract the array were unsuccessful. The ISS Mission Management Team met Monday morning and made the decision to jettison ROSA directly from its location at the end of the space station’s robotic arm, where it remained fully deployed in a normal configuration.

The original plan called for ROSA to be stored back inside the trunk of SpaceX’s Dragon which is detached and burned up in the atmosphere during Dragon reentry. The Operations team executed the jettison procedure that was developed as part of the pre-flight planning process that covered various scenarios. Once jettisoned, ROSA will not present any risk to the International Space Station and will not impact any upcoming visiting vehicle traffic.

ROSA is an experiment to test a new type of solar panel that rolls open in space and is more compact than current rigid panel designs. The ROSA investigation tests deployment and retraction, shape changes when the Earth blocks the sun, and other physical challenges to determine the array’s strength and durability.

The SpaceX Dragon cargo craft is one week away from departing the International Space Station. NASA astronaut Peggy Whitson continued packing Dragon this morning with used hardware and research samples for analysis back on Earth. Dragon will be released from the Canadarm2 Sunday at 11:38 a.m. EDT and splash down in the Pacific Ocean about 5-1/2 hours later.

Whitson then joined Flight Engineer Jack Fischer in the afternoon to wrap up the Seedling Growth-3 experiment. The botanical study is exploring how the lack of gravity impacts light sensing and growth in plants. Plant samples from the study will be returned to Earth on Sunday inside the Dragon resupply ship.

Commander Fyodor Yurchikhin, along with Whitson and Fischer, took body measurements today to help scientists understand how living in space affects body size. The crew also collected blood, urine, saliva and breath samples for more insight on astronaut health.


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7 thoughts on “Crew Preps for Solar Array Jettison and Dragon Departure

  1. Jeanne Wray

    Hello,im Jeanne wray and my family and I look to Sky’s as often as possible,for a glimpse of iss,we just want to say we are so very proud of our astronots,space x,you are always in our prayers!way to go guys North Carolina loves you see you in the Sky’s !

    Reply
    1. Mark Garcia Post author

      ROSA simply failed to retract when commanded by ground controllers. ROSA was supposed to be reinstalled inside the trunk of Dragon after its retraction. However, managers decided to jettison ROSA back into Earth’s atmosphere and burn up.

      Reply
  2. Tina Cox

    Are you able to release the time that the ROSA was jettisoned? I’d like to examine tracking data from sensors I work with, and I’m curious if our sensors would have seen the two objects separate. Thank you, Tina

    Reply
  3. Anika yeong kim

    ..we’ve seen a kind like falling debris above the sky.. 7:25 pm.. Philippine time.. and we are not sure if this is truly a debris or a flare gun from a sinking ship…

    Reply

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