NASA confirmed that the OSIRIS-REx mission picked up sufficient materials from asteroid Bennu throughout its pattern assortment try on Tuesday. In truth, the spacecraft’s assortment chamber is now too full to shut all the best way, main a number of the materials to float off into area. “There’s a lot in there that the pattern is now escaping,” Thomas Zurbuchen, NASA’s affiliate administrator for science, mentioned Friday.
What was purported to occur: On Tuesday, OSIRIS-REx descended to asteroid Bennu (the thing it has studied from orbit for nearly two years now, greater than 200 million miles from Earth) and scooped up rubble from the floor throughout a six-second landing earlier than flying again into area.
The purpose was to securely accumulate a minimum of 60 grams of fabric, and the company anticipated to run a sequence of procedures to confirm how a lot was collected. These included observations of the pattern assortment chamber utilizing onboard cameras, in addition to a spin maneuver scheduled for Saturday that might approximate the pattern’s mass by way of moment-of-inertia measurements.
What truly occurred: Over the previous few days, the onboard cameras revealed that the gathering chamber was dropping particles that had been floating into area. “A considerable quantity of the pattern is seen floating away,” mission lead Dante Lauretta mentioned Friday. Because it turned out, the pattern assortment try picked up an excessive amount of materials—presumably as much as two kilograms, the higher restrict of what OSIRIS-REx was designed to gather. About 400 grams appears seen from the cameras. The gathering lid has failed to shut correctly and stays wedged open by items which can be as much as three centimeters in dimension, making a centimeter-wide hole for materials to flee.
It appears when OSIRIS-REx touched down on Bennu’s floor, the gathering head went 24 to 48 centimeters deep, which might clarify the way it recovered a lot materials.
How unhealthy is it? It’s not horrible! It’s clearly regarding that some materials has been misplaced, however this loss was largely resulting from some actions of the arm on Thursday (the fabric behaves like a fluid in microgravity, so any motion will trigger the pattern to swirl round and doubtlessly movement out of the chamber). Lauretta estimates that as a lot as 10 grams could have been misplaced to date. Given how a lot was collected, nonetheless, this loss is comparatively small. The arm has now been moved right into a “park” place in order that materials is transferring round extra slowly, which ought to reduce extra loss.
What’s subsequent? The mission is forgoing the scheduled weigh process, since a spin maneuver would undoubtedly result in extra materials loss, and NASA is assured it has far more than the 60 grams initially sought. As an alternative, the mission is expediting the stowing of the pattern, which NASA expects to happen Monday. After the pattern is stowed safely, OSIRIS-REx will go away Bennu in March, and convey the pattern again to Earth in 2023.