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How NASA’s OSIRIS-APEX asteroid probe survived its 1st shut encounter with the solar

May 30, 2024
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How NASA’s OSIRIS-APEX asteroid probe survived its 1st shut encounter with the solar
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OSIRIS-APEX emerged “unscathed” from its closest-ever brush previous our solar on Jan. 2, scientists introduced on Tuesday (Could 28). 

The probe, initially often called OSIRIS-REx, aced its sample-return mission to the asteroid Bennu and is now headed to the area rock Apophis on an prolonged mission. That new mission requires OSIRIS-APEX to glide 25 million miles (40 million kilometers) nearer to the solar than it was designed to function. Scientists deem a number of such shut passes vital for the probe to get on a path to achieve Apophis in 2029.

OSIRIS-APEX is in an elliptical orbit round our solar, which places it at a degree closest to the star as soon as each 9 months. Its first such shut strategy occurred on Jan. 2. To organize for the extreme blast of radiation, in early December the mission crew tucked in considered one of OSIRIS-APEX’s two photo voltaic panels such that it shaded the probe’s most delicate devices, whereas the second panel confronted the solar with the intention to energy the spacecraft. 

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side-by-side identical images, showing a closeup look at a shiny silver spacecraft in space

Each of those photographs from a digital camera known as StowCam aboard OSIRIS-APEX present the identical view taken six months aside, earlier than (left) and after (proper) the Jan. 2, 2024, perihelion. Notably, there isn’t a observable distinction on spacecraft surfaces, a superb indication that the upper temperatures confronted throughout perihelion didn’t alter the spacecraft. One other perception gleaned from the equivalent view within the two photographs is that the digital camera’s efficiency was additionally not affected by perihelion.  (Picture credit score: NASA/College of Arizona/Lockheed Martin)

This little bit of inventive engineering protected the spacecraft throughout its dangerously shut strategy to the solar, similar to pc simulations had beforehand predicted, the mission crew shared this week in a NASA statement.

“It is phenomenal how nicely our spacecraft configuration protected OSIRIS-APEX, so I am actually inspired by this primary shut perihelion cross,” stated Ron Mink, the mission methods engineer for OSIRIS-APEX at NASA’s Goddard Area Flight Middle in Maryland.

Telemetry information downloaded from the spacecraft in mid-March assured scientists of its good well being. By early April, the probe had gotten far sufficient away from the solar to renew regular operations, in response to the NASA assertion.

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Scientists and engineers had been additionally pleasantly stunned to notice that an onboard digital camera fared even higher than anticipated after being uncovered to excessive temperatures throughout the encounter. MapCam, a medium-range digital camera that beforehand mapped Bennu in shade and also will map Apophis, noticed a 70% discount in cumbersome white spots known as scorching pixels since April of final 12 months, the final time the digital camera was examined.

Sizzling pixels happen as a result of extended publicity to photo voltaic radiation and are a standard difficulty for cameras in area. Whereas they’re usually resolved with managed warmth utilizing onboard heaters, OSIRIS-APEX’s digital camera was restored naturally, due to the spike in warmth from the shut photo voltaic encounter, scientists stated.

Whereas mission crew members are relieved that OSIRIS-APEX is protected after its first shut strategy to the solar, they famous that it is unclear how 5 extra such encounters could influence the probe and its devices.

The subsequent closest strategy to the solar is scheduled for Sept. 1, when the spacecraft will as soon as once more cross inside 46.5 million miles (74.8 million km) of the solar’s floor, nicely inside the orbit of Venus and nicely past the probe’s initially envisioned operational limits.



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