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Astronomie - Trojan bound: NASA gives Lucy spacecraft the green light

1.11.2018

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From Ryugu to Bennu, asteroid exploration has been all the rage among astronomers lately. And now, we’re one step closer to exploring some of the most mysterious asteroids in the solar system.

On October 30, NASA announced that they’ve been given the green light to start building Lucy, a spacecraft that will probe Jupiter’s trojan asteroids and is set to launch in October of 2021. On top of giving the go-ahead for construction, NASA has also solidified the mission’s budget, schedule, and its suite of high-powered instruments. The much-anticipated project will study two populations of asteroids caught by Jupiter’s gravity, about which little is known.

A Long Journey

Studying asteroids is a hefty task, and it’s not going to be a quick one, either. The Lucy mission, named after the 3.2 million year-old hominin fossil who helped us understand human evolution, will take almost 12 years to complete. Once it’s finished, though, the craft will have probed seven different asteroids — six trojans and one main-belt asteroid between Mars and Jupiter.

After launching from Cape Canaveral, the craft will orbit twice around Earth before relying on a gravity assist to fling it out into space. In this slingshot-like maneuver, Lucy will approach Earth from behind and dip briefly into its strong gravitational field for a speed boost. This move will help both reduce the mission’s overall travel time and cut down on the amount of heavy fuel it needs to carry.

The first stop on its celestial voyage will be at 52246 Donaldjohanson, a small main-belt asteroid named after the famous paleoanthropologist who discovered Lucy. It will orbit close to the asteroid and use its infrared mapping spectrometer, thermal infrared spectrometer, and high-resolution visible imager to study its surface composition and physical properties.

With one asteroid under its belt, the mission will continue on its journey to the trojans. These famous asteroids circle the Sun in the same orbit as Jupiter, with one massive group flying ahead of the gas giant, and another trailing behind at what’s known as Lagrangian points. Using the same instruments and techniques, Lucy will probe four trojans in the group leading Jupiter and two in its orbital trail.

Uncovering the Past

When it comes to tracking our solar system’s history, Lucy’s data could prove highly valuable. It’s believed that asteroids are ancient fragments leftover from our solar system’s formation, and that they, unlike planets and moons, have roughly the same structure and chemical composition that they did when they first formed. It’s also thought that asteroids could have transported organic molecules, like water, to larger celestial bodies.

By determining the compositions of these relics, Lucy could gain insight into the chemical elements that made up our infant solar system, and help researchers trace its formation and evolution.

Quelle: Astronomy

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NASA’s Mission to Jupiter’s Trojans Given the Green Light for Development

 lucy-crop

NASA's mission to perform the first reconnaissance of the Trojans, a population of primitive asteroids orbiting in tandem with Jupiter, passed a critical milestone today. NASA has given approval for the implementation and 2021 launch of the Lucy spacecraft.

The confirmation review, formally known as "Key Decision Point C," authorized continuation of the project into the development phase and set its cost and schedule. The confirmation review panel approved the detailed plans, instrument suite, budget and risk factor analysis for the spacecraft.

The next major mission milestone, the Critical Design Review, will examine the detailed Lucy system design. After a successful critical design review, the project team will assemble the spacecraft and its instruments.

“Up until now this mission has entirely been on paper,” said Lucy Principal Investigator Hal Levison of the Southwest Research Institute at Boulder, Colorado. “Now we have the go ahead to actually cut metal and start putting this spacecraft together.”

Lucy, the first space mission to study the Trojans, takes its name from the fossilized human ancestor called “Lucy” by her discoverers whose skeleton provided unique insight into humanity's evolution. Likewise, the Lucy mission will revolutionize our knowledge of planetary origins and the formation of the solar system.

Lucy is planned for launch October 2021. During its 12-year journey, the spacecraft will visit seven different asteroids - a Main Belt asteroid and six Trojans. The spacecraft and a remote-sensing instrument suite will study the geology, surface composition, and bulk physical properties of these bodies at close range.

“Today’s confirmation of Lucy is a key step towards better understanding the role that small bodies played in the formation of the Solar System and life on Earth,” said Adriana Ocampo, Lucy’s program executive at NASA Headquarters in Washington, DC. “We congratulate the entire team for their hard work.”

Southwest Research Institute (SwRI) in Boulder, Colorado is the principal investigator institution and will lead the science investigation. NASA’s Goddard Space Flight Center in Greenbelt, Maryland, will provide overall mission management, systems engineering and safety and mission assurance. Lockheed Martin Space Systems in Denver, Colorado, will build the spacecraft. Instruments will be built by Goddard, the Johns Hopkins Applied Physics Laboratory in Laurel, Maryland, and Arizona State University in Tempe.

Quelle: NASA

 
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