NASA's Lucy to fly past thousands of objects for Earth gravity assist NASAGoddard
Mission engineers will track NASA's Lucy spacecraft nonstop as it prepares toto use this planet's gravity to set itself on a course toward the Jupiter Trojan asteroids.
The International Space Station, for instance, has maneuvered out of the way of space debris 31 times since 1999, including three times since 2020. But Lucy has a long way to go before it arrives at the Trojans in 2027. The upcoming gravity assist is one of three the spacecraft will rely on to catapult itself to its deep-space targets.
Determining the positions of spacecraft, plus orbiting satellites and debris, is challenging, particularly when trying to anticipate the future. Largely that's because the Sun plays a major role in pulling or pushing objects around, and future solar activity is hard to predict. For example, the Sun's activity—how much plasma and radiation it shoots out—affects atmosphere density, and thus how much friction will tug on a spacecraft and slow it down.
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