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The OSIRIS-REx science team today announced that, in order to give them more preparation time needed because of the coronavirus protocols, they have rescheduled their second rehearsal of the spacecraft’s touch-and-go sample grab from the asteroid Bennu from June to August, and delayed the actual touch-and-go sample grab from August to October.
The mission had originally planned to perform the first Touch-and-Go (TAG) sample collection event on Aug. 25 after completing a second rehearsal in June. This rehearsal, now scheduled for Aug. 11, will bring the spacecraft through the first three maneuvers of the sample collection sequence to an approximate altitude of 131 ft (40 m) over the surface of Bennu. The first sample collection attempt is now scheduled for Oct. 20, during which the spacecraft will descend to Bennu’s surface and collect material from sample site Nightingale.
Previously they had said that the rehearsal would get as close as 82 feet. Nothing has changed. That distance was the closest they expected the spacecraft to get. The new number, 131 feet, is in the middle of possible ranges. As explained to me by Erin Morton, head of communications for OSIRIS-REx in the Principal Investigator’s Office, “I originally chose the lowest altitude in that range to include in our public outreach materials, but later realized that it made more sense to use the mid-point altitude number, since that’s the average of the high and low possibilities.”
Though they have the ability to do two more sample grabs if the first in October is unsuccessful, they won’t bother if it succeeds. They must leave Bennu regardless in mid-2021 to return the sample to Earth on September 24, 2023.