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By NASA
NASA’s Lucy spacecraft is 6 days and less than 50 million miles (80 million km) away from its second close encounter with an asteroid; this time, the small main belt asteroid Donaldjohanson.
Download high-resolution video and images from NASA’s Scientific Visualization Studio.
NASA/Dan Gallagher This upcoming event represents a comprehensive “dress rehearsal” for Lucy’s main mission over the next decade: the exploration of multiple Trojan asteroids that share Jupiter’s orbit around the Sun. Lucy’s first asteroid encounter – a flyby of the tiny main belt asteroid Dinkinesh and its satellite, Selam, on Nov. 1, 2023 – provided the team with an opportunity for a systems test that they will be building on during the upcoming flyby.
Lucy’s closest approach to Donaldjohanson will occur at 1:51pm EDT on April 20, at a distance of 596 miles (960 km). About 30 minutes before closest approach, Lucy will orient itself to track the asteroid, during which its high-gain antenna will turn away from Earth, suspending communication. Guided by its terminal tracking system, Lucy will autonomously rotate to keep Donaldjohanson in view. As it does this, Lucy will carry out a more complicated observing sequence than was used at Dinkinesh. All three science instruments – the high-resolution greyscale imager called L’LORRI, the color imager and infrared spectrometer called L’Ralph, and the far infrared spectrometer called L’TES – will carry out observation sequences very similar to the ones that will occur at the Trojan asteroids.
However, unlike with Dinkinesh, Lucy will stop tracking Donaldjohanson 40 seconds before the closest approach to protect its sensitive instruments from intense sunlight.
“If you were sitting on the asteroid watching the Lucy spacecraft approaching, you would have to shield your eyes staring at the Sun while waiting for Lucy to emerge from the glare. After Lucy passes the asteroid, the positions will be reversed, so we have to shield the instruments in the same way,” said encounter phase lead Michael Vincent of Southwest Research Institute (SwRI) in Boulder, Colorado. “These instruments are designed to photograph objects illuminated by sunlight 25 times dimmer than at Earth, so looking toward the Sun could damage our cameras.”
Fortunately, this is the only one of Lucy’s seven asteroid encounters with this challenging geometry. During the Trojan encounters, as with Dinkinesh, the spacecraft will be able to collect data throughout the entire encounter.
After closest approach, the spacecraft will “pitch back,” reorienting its solar arrays back toward the Sun. Approximately an hour later, the spacecraft will re-establish communication with Earth.
“One of the weird things to wrap your brain around with these deep space missions is how slow the speed of light is,” continued Vincent. “Lucy is 12.5 light minutes away from Earth, meaning it takes that long for any signal we send to reach the spacecraft. Then it takes another 12.5 minutes before we get Lucy’s response telling us we were heard. So, when we command the data playback after closest approach, it takes 25 minutes from when we ask to see the pictures before we get any of them to the ground.”
Once the spacecraft’s health is confirmed, engineers will command Lucy to transmit the science data from the encounter back to Earth, which is a process that will take several days.
Donaldjohanson is a fragment from a collision 150 million years ago, making it one of the youngest main belt asteroids ever visited by a spacecraft.
“Every asteroid has a different story to tell, and these stories weave together to paint the history of our solar system,” said Tom Statler, Lucy mission program scientist at NASA Headquarters in Washington. “The fact that each new asteroid we visit knocks our socks off means we’re only beginning to understand the depth and richness of that history. Telescopic observations are hinting that Donaldjohanson is going to have an interesting story, and I’m fully expecting to be surprised – again.”
NASA’s Goddard Space Flight Center in Greenbelt, Maryland, designed and built the L’Ralph instrument and provides overall mission management, systems engineering and safety and mission assurance for Lucy. Hal Levison of SwRI’s office in Boulder, Colorado, is the principal investigator. SwRI, headquartered in San Antonio, also leads the science team and the mission’s science observation planning and data processing. Lockheed Martin Space in Littleton, Colorado, built the spacecraft, designed the original orbital trajectory and provides flight operations. Goddard and KinetX Aerospace are responsible for navigating the Lucy spacecraft. The Johns Hopkins Applied Physics Laboratory in Laurel, Maryland, designed and built the L’LORRI (Lucy Long Range Reconnaissance Imager) instrument. Arizona State University in Tempe, Arizona, designed and build the L’TES (Lucy Thermal Emission Spectrometer) instrument. Lucy is the thirteenth mission in NASA’s Discovery Program, which is managed by NASA’s Marshall Space Flight Center in Huntsville, Alabama.
By Katherine Kretke, Southwest Research Institute
Media Contact:
Karen Fox / Molly Wasser
Headquarters, Washington
202-358-1600
karen.c.fox@nasa.gov / molly.l.wasser@nasa.gov
Nancy N. Jones
NASA’s Goddard Space Flight Center, Greenbelt, Md.
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Last Updated Apr 14, 2025 EditorMadison OlsonContactNancy N. Jonesnancy.n.jones@nasa.govLocationGoddard Space Flight Center Related Terms
Lucy Goddard Space Flight Center Planetary Science Explore More
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By NASA
Nick Kopp is a Dragon flight lead in the Transportation Integration Office at Johnson Space Center in Houston. He is currently leading NASA’s efforts to prepare, launch, and return the agency’s 32nd SpaceX commercial resupply services mission. He works directly with SpaceX and collaborates with NASA’s many internal, external, and international partners to ensure the success of this and other cargo missions to the International Space Station.
Read on to learn about his career with NASA and more!
Nick Kopp’s official portrait.NASA/Bill Stafford The time and effort spent building, maintaining, and conducting science on the International Space Station is spent by people in our community and communities around the world to further humanity's collective understanding of the universe around us.
Nick Kopp
Transportation Integration Office Flight Lead
Where are you from?
I am from Cleveland, Ohio.
Tell us about your role at NASA.
I work directly with SpaceX to ensure the Dragon cargo spacecraft meets NASA’s requirements to visit the space station. I also collaborate with NASA’s various partners who are safely flying science investigations and other cargo to and from the space station. For the upcoming flight, I’ve worked extensively with SpaceX to prepare to return the Dragon cargo spacecraft off the coast of California.
How would you describe your job to family or friends who may not be familiar with NASA?
I’m responsible for getting stuff to and from the International Space Station safely.
How long have you been working for NASA?
I have been working for NASA for about 15 years at both Marshall Space Flight Center in Alabama and Johnson Space Center in Texas.
What advice would you give to young individuals aspiring to work in the space industry or at NASA?
It takes so many different people with all kinds of different skills working together to make missions happen. I would suggest looking at NASA’s websites to find the skill or task that makes you want to learn more and then focusing your energy into that skill. Surround yourself with people with similar goals. Connect with people in the industry and ask them questions. You are in control of your destiny!
Nick Kopp in front of the International Space Station Payload Operations Center at the agency’s Marshall Space Flight Center in Huntsville, Alabama. What was your path to NASA?
I’ve wanted to work at NASA since I was a kid and my grandfather showed me the Moon through his home-built telescope. I studied aerospace engineering at the University of Illinois, where I joined Students for the Exploration and Development of Space and attended a conference at NASA’s Goddard Space Flight Center in Maryland. I met some folks from the Payload Operations Integration Center and learned of the awesome space station science operations at Marshall. I was lucky enough to be chosen for a contractor job working directly with astronauts on the space station to conduct science experiments!
Is there someone in the space, aerospace, or science industry that has motivated or inspired you to work for the space program? Or someone you discovered while working for NASA who inspires you?
After working with him from the ground when he was aboard the space station, I was lucky enough to spend many overnight shifts getting to know NASA astronaut and Flight Director TJ Creamer. TJ’s path to NASA and his servant leadership have left an ongoing legacy for people at the agency. His general attitude, extreme competence, friendly demeanor, and genuine care for people around him continue to inspire me every day to become a great leader.
What is your favorite NASA memory?
My favorite NASA memory is being selected as a payload operations director on the International Space Station Payload Operations and Integration Center flight control team. I looked up to those in this position for 10 years and did everything I could to gather the skills and knowledge I needed to take on the role. I became responsible for the minute-to-minute operations of astronauts conducting science investigations on the space station. I vividly remember the joy I felt learning of the news of my assignment, taking my first shift, my first conversation with an astronaut in space, and the bittersweet decision to leave and continue my career goals at NASA in a different role.
Nick Kopp, right, behind a console in the International Space Station Payload Operations Integration Center at the agency’s Marshall Space Flight Center. What do you love sharing about station? What’s important to get across to general audiences to help them understand the benefits to life on Earth?
Although it takes place off the planet, research on the space station is conducted for people on Earth. The time and effort spent building, maintaining, and conducting science on the International Space Station is spent by people in our community and communities around the world to further humanity’s collective understanding of the universe around us. When we understand more about science, we can be more successful. So many people around the planet have had life-changing benefits from experiments that can only be done by people conducting research in microgravity, above the atmosphere, where you can view most of Earth.
If you could have dinner with any astronaut, past or present, who would it be?
I would have dinner with anyone from the Apollo 13 crew. I’d love to learn how they felt that NASA’s culture drove the outcome of that mission.
Do you have a favorite space-related memory or moment that stands out to you?
While working a night shift at the operations center in Huntsville, Alabama, we were monitoring payloads returning to Earth on a Dragon cargo spacecraft. We took a quick break outside the control center to watch as the spacecraft re-entered Earth’s atmosphere above us on its way to splash down off the coast of Florida. It was a clear night. As the spacecraft flew overhead, we saw the ablative heat shield create a shimmering trail of fire and sparkles that stretched across the whole night sky. It looked as though Tinker Bell just flew over us!
What are some of the key projects you’ve worked on during your time at NASA? What have been your favorite?
Some of my favorite projects I’ve worked on include:
Serving as the International Space Station Program’s representative as flight lead for NASA’s SpaceX Crew-8 mission Troubleshooting unexpected results when conducting science on the space station Writing instructions for astronauts filming a virtual reality documentary on the space station Assessing design changes on the Space Launch System rocket’s core stage Managing and training a team of flight controllers Helping NASA move Dragon spacecraft returns from Florida to California Nick Kopp enjoys sailing on his days off. What are your hobbies/things you enjoy outside of work?
I love playing board games with my wife, sailing, flying, traveling around the world, and learning about leadership and project management theory.
Day launch or night launch?
The Crew-8 night launch, specifically, where the Falcon 9 booster landed just above me!
Favorite space movie?
Spaceballs
NASA “worm” or “meatball” logo?
Meatball
Every day, we’re conducting exciting research aboard our orbiting laboratory that will help us explore further into space and bring benefits back to people on Earth. You can keep up with the latest news, videos, and pictures about space station science on the Station Research & Technology news page. It’s a curated hub of space station research digital media from Johnson and other centers and space agencies.
Sign up for our weekly email newsletter to get the updates delivered directly to you.
Follow updates on social media at @ISS_Research on Twitter, and on the space station accounts on Facebook and Instagram.
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By European Space Agency
The European Space Agency (ESA) has powered down its Gaia spacecraft after more than a decade spent gathering data that are now being used to unravel the secrets of our home galaxy.
On 27 March 2025, Gaia’s control team at ESA’s European Space Operations Centre carefully switched off the spacecraft’s subsystems and sent it into a ‘retirement orbit’ around the Sun.
Though the spacecraft’s operations are now over, the scientific exploitation of Gaia’s data has just begun.
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By NASA
NASA/Brandon Torres Navarrete Engineers at NASA’s Ames Research Center in California’s Silicon Valley, Bohdan Wesely, right, and Eli Hiss, left, complete a fit check of the two halves of a space capsule that will study the clouds of Venus for signs of life.
Led by Rocket Lab of Long Beach, California, and their partners at the Massachusetts Institute of Technology in Cambridge, Rocket Lab’s Venus mission will be the first private mission to the planet.
NASA’s role is to help the commercial space endeavor succeed by providing expertise in thermal protection of small spacecraft. Invented at Ames, NASA’s Heatshield for Extreme Entry Environment Technology (HEEET) – the brown, textured material covering the bottom of the capsule in this photo – is a woven heat shield designed to protect spacecraft from temperatures up to 4,500 degrees Fahrenheit. The probe will deploy from Rocket Lab’s Photon spacecraft bus, taking measurements as it descends through the planet’s atmosphere.
Teams at Ames work with private companies, like Rocket Lab, to turn NASA materials into solutions such as the heat shield tailor-made for this spacecraft destined for Venus, supporting growth of the new space economy. NASA’s Small Spacecraft Technology program, part of the agency’s Space Technology Mission Directorate, supported development of the heat shield for Rocket Lab’s Venus mission.
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By NASA
3 min read
Preparations for Next Moonwalk Simulations Underway (and Underwater)
NASA’s Lucy spacecraft has its next flyby target, the small main belt asteroid Donaldjohanson, in its sights. By blinking between images captured by Lucy on Feb. 20 and 22, this animation shows the perceived motion of Donaldjohanson relative to the background stars as the spacecraft rapidly approaches the asteroid.
NASA’s Lucy spacecraft’s first views of the asteroid Donaldjohanson. The asteroid is circled on the left to guide the eye.NASA/Goddard/SwRI/Johns Hopkins APL Lucy will pass within 596 miles (960 km) of the 2-mile-wide asteroid on April 20. This second asteroid encounter for the Lucy spacecraft will serve as a dress-rehearsal for the spacecraft’s main targets, the never-before-explored Jupiter Trojan asteroids. Lucy already successfully observed the tiny main belt asteroid Dinkinesh and its contact-binary moon, Selam, in November 2023. Lucy will continue to image Donaldjohanson over the next two months as part of its optical navigation program, which uses the asteroid’s apparent position against the star background to ensure an accurate flyby.
Donaldjohanson will remain an unresolved point of light during the spacecraft’s long approach and won’t start to show surface detail until the day of the encounter.
From a distance of 45 million miles (70 million km), Donaldjohanson is still dim, though it stands out clearly in this field of relatively faint stars in the constellation of Sextans. Celestial north is to the right of the frame, and the 0.11-degree field of view would correspond to 85,500 miles (140,000 km) at the distance of the asteroid. In the first of the two images, another dim asteroid can be seen photobombing in the lower right quadrant of the image. However, just as the headlights of an approaching car often appear relatively stationary, Donaldjohanson’s apparent motion between these two images is much smaller than that of this interloper, which has moved out of the field of view in the second image.
These observations were made by Lucy’s high-resolution camera, the L’LORRI instrument — short for Lucy LOng Range Reconnaissance Imager — provided by the Johns Hopkins Applied Physics Laboratory in Laurel, Maryland.
Asteroid Donaldjohanson is named for anthropologist Donald Johanson, who discovered the fossilized skeleton — called “Lucy” — of a human ancestor. NASA’s Lucy mission is named for the fossil.
Lucy’s principal investigator, Hal Levison, is based out of the Boulder, Colorado, branch of Southwest Research Institute, headquartered in San Antonio. NASA’s Goddard Space Flight Center in Greenbelt, Maryland, provides overall mission management, systems engineering, and safety and mission assurance. Lockheed Martin Space in Littleton, Colorado, built the spacecraft. Lucy is the 13th mission in NASA’s Discovery Program. NASA’s Marshall Space Flight Center in Huntsville, Alabama, manages the Discovery Program for the Science Mission Directorate at NASA Headquarters in Washington.
For more information about NASA’s Lucy mission, visit: https://www.nasa.gov/lucy
By Katherine Kretke
Southwest Research Institute
Media Contact:
Nancy N. Jones
NASA’s Goddard Space Flight Center, Greenbelt, Md.
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Last Updated Feb 25, 2025 Related Terms
Lucy General Goddard Space Flight Center Planetary Science The Solar System Trojan Asteroids View the full article
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