The NASA Earth Action Water Resources program area advances the use of Earth science data to support sustainable and adaptable water resources management. Through collaboration with partners, the program area works to enhance water use efficiency, advance water quality monitoring and modeling, and strengthen water resilience. These efforts empower informed decision-making and address critical challenges in water resources.
The NASA Earth Action Health and Air Quality program area encourages the use of Earth observations in air quality management and public health, including environmental health and infectious diseases. The program area helps public health and air quality managers, policymakers, and the public manage health-related decisions and minimize disease risk.
The Energy and Infrastructure program area provides solar, meteorological, and other types of Earth information to aid decision-making related to energy production and management, power systems planning, building energy efficiency and sustainability, and resilient infrastructure. Two major projects are: Prediction Of Worldwide Energy Resources (POWER), which curates satellite and modeling data in free web platforms, and Risk Analysis and Solutions Innovators (RASI), which tailors meteorological and other Earth information to support infrastructure resilience for U.S. communities, especially those surrounding NASA Centers.
The Spanish-language broadcaster has won over millions of US viewers with its energetic commentary during games
Soccer fans looking to watch the 2026 World Cup on US television have been presented with two very different options this tournament.
The first is Fox Sports, a cousin of Fox News owned by the same parent company and the sole network airing matches in English in the US. Audiences tuning in to Fox, which acquired the exclusive English broadcast rights in 2015, are met with coverage that reflects the network’s “America first” aesthetic, with promos for pro-Donald Trump talkshows, advertising breaks during games and the frequent, grating presence of host Alexi Lalas.
Acapulco Imagen Awards recognition has given Apple TV’s bilingual comedy one more victory after its fourth and final season. The series leads the 41st Annual Imagen Awards with 13 nominations, placing its cast, directors, music team and production among the year’s most celebrated examples of Latino creative work.
The Imagen Foundation announced the nominations Thursday as part of its annual program recognizing Latino talent and representation across film, television, music, documentaries and digital media. Acapulco received more nominations than any other series, including recognition for Best Comedy Series and multiple acting and directing performances.
The awards organization also announced that actor, filmmaker, producer and musician Andy Garcia will receive its Lifetime Achievement Award. Garcia is separately nominated for his supporting performance in Landman, giving the ceremony another connection between a career-spanning honor and current screen work.
For Apple TV, the nominations extend the life of a series that completed its run in September 2025. Acapulco may have checked out of Las Colinas, but the Imagen Awards are giving the resort one more crowded week.
Acapulco Imagen Awards Reach Across the Production
The 13 nominations show how widely the Imagen Foundation recognized the series rather than concentrating only on its lead actors.
Acapulco is nominated for Best Comedy Series, while Oscar Almengor and Santiago Limón both received Best Director nominations. Javier Nuño and Joe Rodríguez were recognized for Best Music Supervision for Film or Television.
Enrique Arrizon and Camila Perez are both nominated in the Best Actor — Comedy category. Although the category name uses “Actor,” the Imagen Foundation placed performers of different genders together in the 2026 comedy field.
The supporting categories gave Acapulco an especially strong presence. Eugenio Derbez, Fernando Carsa, Carlos Corona and Cristo Fernández received Best Supporting Actor — Comedy nominations. Vanessa Bauche and Keyla Monterroso Mejia are nominated for Best Supporting Actress — Comedy.
That distribution reflects the ensemble structure that allowed Acapulco to run for four seasons. The series used Máximo Gallardo’s memories as its entry point, but Las Colinas worked because the hotel was filled with characters whose ambitions, friendships and disasters could carry stories of their own.
The show’s visual identity often received attention first. Its bright colors, resort setting and polished 1980s design made it easy to recognize within seconds. The Imagen nominations reach beyond that appearance and recognize the performances, direction and music that gave the setting its emotional rhythm.
Image Credit: Apple Inc.
A Final Season That Kept the Ensemble Moving
The fourth season returned to Las Colinas with two connected timelines. In the present day, Máximo worked to restore the hotel before its reopening. In 1986, his younger self tried to protect Las Colinas after a competing resort claimed the top position in Acapulco’s annual hotel rankings.
That structure allowed the series to close the distance between the ambitious young employee played by Arrizon and the successful older man played by Derbez. The final episodes had to complete character relationships, resolve the hotel’s future and explain how youthful choices shaped the life Máximo later built.
The Imagen nominations suggest the final season avoided becoming a farewell built only around nostalgia. Its actors remained competitive across several categories, and both nominated directors received recognition for guiding individual parts of the closing chapter.
Acapulco also maintained its bilingual identity throughout the run. English and Spanish were not treated as occasional flavor or a translation exercise. They reflected the characters, workplace and cultural setting. That helped the series reach an international audience without removing the Mexican identity at its center.
For Apple TV, that combination provided a comedy that could travel globally while remaining tied to a specific place and community.
Apple TV Earns Recognition Beyond One Series
Acapulco delivered Apple TV’s largest Imagen Awards presence, but it was not the service’s only nominated production.
Pluribus received a nomination for Best Drama Series, while Carlos-Manuel Vesga was nominated for Best Supporting Actor — Drama. The Morning Show earned nominations for director Miguel Arteta and supporting actor Nestor Carbonell.
Peter Dager of Stick joined Carbonell in the supporting comedy category, while Mariana Treviño received a Best Supporting Actress — Comedy nomination for the same series. Isabella Gomez was recognized for Shrinking, and Aimee Carrero received a nomination for Your Friends & Neighbors.
Apple’s animated series also appeared in the youth category, with WondLa and Wonder Pets: In the City both nominated for Best Youth Programming. Harvey Guillén received a Best Voice-Over Actor nomination for Shape Island.
The broader list reinforces Apple TV’s ability to attract Latino performers and creators across genres rather than through one designated cultural title. Drama, workplace comedy, animation and mystery all contributed to the service’s presence.
Acapulco remains the centerpiece because its 13 nominations represent recognition of an entire production, not a single breakout performance.
Image Credit: Apple Inc.
Andy Garcia Receives a Career Honor
Andy Garcia’s Lifetime Achievement Award gives the ceremony a different scale. His career has moved through major studio films, independent productions, television, directing, producing and music over several decades.
Garcia became widely known through films including The Untouchables, Internal Affairs, The Godfather Part III and Ocean’s Eleven. His performance as Vincent Mancini in The Godfather Part III earned him an Academy Award nomination, while later roles allowed him to move between crime drama, comedy, family stories and television.
His Imagen recognition also reflects a career shaped by Cuban American identity without limiting him to one type of role. Garcia has frequently spoken about cultural representation, creative ownership and the difficulty of bringing Latino-centered stories through the traditional Hollywood system.
The Lifetime Achievement Award arrives while Garcia remains active rather than functioning as a retirement tribute. His nomination for Landman places him directly inside the current awards field he is being asked to help represent.
That combination suits the Imagen Foundation’s mission. The honor recognizes longevity, but it also connects Garcia’s career with the actors, directors and producers building the next generation of Latino entertainment.
A Strong Farewell for Las Colinas
Acapulco ended after four seasons, which makes the scale of its Imagen recognition especially satisfying. The series did not need a fifth season announcement to extend its cultural presence. Its final production year generated enough work to lead an entire awards field.
The show also leaves Apple TV with a useful model for international programming. Acapulco was local without being narrow, bilingual without turning language into a gimmick and colorful without allowing its visual style to replace character development.
Its 13 nominations cover the exact areas that sustained that model: acting, direction, music and the series as a whole. The result is less like one last souvenir from Las Colinas and more like a full luggage cart.
Winners of the 41st Annual Imagen Awards will be announced during the ceremony in August. Acapulco will arrive with the largest number of chances, while Andy Garcia receives an honor that extends far beyond one performance or season.
The hotel may have closed its final television chapter, but the Imagen Awards have found 13 reasons to reopen the doors.
“I didn’t sign up to try to measure a new record or anything”, said Matt Carnicle, a volunteer for the NASA-sponsored Community Collaborative Rain, Hail, and Snow Network, or CoCoRaHS, project. Carnicle measured a whopping 29.06 inches of rainfall on June 18th, 2026, breaking an all-time 24-hour record for the state of Louisiana of 22.00 inches. “I’m just a regular guy who likes to track the weather, and I report what I get in my gauge whether it’s zero, two hundredths, or whatever is in there when I read it.”
CoCoRaHS (pronounced KO-ko-rozz) is a network of volunteer weather observers of all ages working together to measure and map rain, hail, and snow by measuring precipitation in their backyards. Together, these thousands of daily precipitation reports – openly available on the project website – are used by scientists and citizens for a wide variety of purposes, to include improving weather forecasting, informing water and land management, driving atmospheric models, and triggering flash flood and severe weather warnings.
Matt joined through a storm-spotter class where he learned how CoCoRaHS is part of a NASA hail research project focused on Gulf States in the Southeast United States. CoCoRaHS reports (and photos) of hail are used for researching the “melt rate” between when the satellite estimates the stone sizes in the clouds and what volunteers measure on the ground. Matt took it a step further and purchased a standardized rain gauge in order to participate with CoCoRaHS by measuring rainfall.
Matt’s June 18, 2026 rain measurement shatters Louisiana’s 1962 state record of 22.00 inches of rain in 24-hours (Hawaii holds the national record with 49.69 inches in 24-hours). Even more remarkably, the 29.06 inches he measured fell in less than 12 hours! According to Louisiana State Climatologist Jay Grymes, who validated Matt’s measurement along with National Weather Service representatives, an event of this magnitude in this area is expected to happen less than once in a thousand years. A National Oceanic and Atmospheric Administration (NOAA) committee will convene in the coming months to verify and document the new record.
You can join Matt and other CoCoRaHS volunteers and submit official rainfall reports to the National Weather Service. They’re also on the lookout for hail in the southeast, where CoCoRaHS and NASA are doing research on how hail melts as it moves from the clouds to the ground. The only requirement for participation is that volunteers use the correct manual gauge, which is precise to the nearest 1/100th of an inch and is approved by the National Weather Service (measurements from automated rain gauges are not accepted). Sign up here, and you might measure the next record precipitation event: https://science.nasa.gov/citizen-science/community-collaborative-rain-hail-and-snow-network/
From left to right: National Weather Service Lake Charles Warning Coordination Meteorologist Doug Cramer, National Weather Service Lake Charles meteorologist Jonathan Brazzell, rain gauge owner/observer Matt Carnicle, and Louisiana State Climatologist Jay Grymes. Carnicle’s arm is around the CoCoRaHS rain gauge. https://www.cocorahs.org/
Image credit: Matt Carnicle.
Learn More and Get Involved
Community Collaborative Rain, Hail, and Snow Network (CoCoRaHS)
Join a national community of precipitation reporters providing critical data to improve scientific understanding and forecasts.
Commercial space station company Vast announced June 24 the addition of several companies and organizations to its network of partners for microgravity research and manufacturing.
Widow's Bay, the delightfully eccentric new comedic horror series from Apple TV, is easily one of the best new series of the year. There's a reason everyone from Guillero del Toro and Ben Stiller to Damon Lindelolf (Lost) is raving about the show. It's an eminently binge-able, addictive series that pays tribute to all the classic horror tropes while reinventing them in surprising ways. Think Stephen King meets Parks and Recreation, with a dash of Twin Peaks—except Widow's Bay is very much its own refreshingly original beast.
(Some spoilers below but no major reveals.)
Tom Loftis (Matthew Rhys) is a widower and mayor of Widow's Bay, a quirky little seaside town that has a colorfully bizarre history marked by periodic tragedies. Tom is eager to elevate the town into a trendy summer tourist destination. But the arrival of New York Times travel writer Arthur Lloyd (Bashir Salahuddin), who has the clout to make Tom's aspirations for Widow's Bay come true, coincides with the onset of a mysterious fog. Local resident Wyck (Stephen Root) warns Tom that the fog is an omen that the island is "waking up," meaning more supernatural occurrences are bound to happen.
Artificial intelligence is increasingly being used to see and understand the world around us. From facial recognition on smartphones to self-driving cars and humanoid robots, computer vision has become one of the most important technologies in modern AI. Now, researchers from the Korea Advanced Institute of Science and Technology (KAIST), working with scientists from the […]
NASA has selected eight new companies and will acquire new data products from six existing Commercial Satellite Data Acquisition contract holders to expand the range of commercial satellite data available to researchers, civil agencies, and decision-makers. Such measurements supplement NASA’s Earth satellites by contributing high-resolution and frequent observations to enhance the agency’s set of data.
Leveraging commercial data demonstrates NASA’s commitment to strong public-private partnerships, allowing the agency to expand scientific insight while reducing costs and accelerating the delivery of data to researchers and decision-makers.
Collectively, NASA and commercial Earth observations provide insight into our home planet – benefitting Americans, providing environmental intelligence, strengthening disaster response, and improving public safety.
The Commercial Satellite Data Acquisition Program On-Ramp 2 Multiple Award contract is a firm-fixed-price, indefinite-delivery/indefinite-quantity multiple-award contract. The original maximum contract value was $476 million, with a performance period that began in 2023 and continues through Nov. 15, 2028.
Contract awardees are:
Airbus DS Geo Inc.
GHGSat Inc.
Hydrosat Inc.
ICEYE US Inc.
ImageSat International
Kuva US Inc.
Muon Space Inc.
Orbital Sidekick Inc.
OroraTech USA Inc.
Planet Labs Federal Inc.
Space Sciences and Engineering LLC, doing business as PlanetiQ
SATLANTIS US
Tomorrow Companies Inc., doing business as Tomorrow.io
Wyvern Inc.
The agency’s Commercial Satellite Data Acquisition mission works to execute a cost-effective way to augment and complement the suite of Earth observations captured by NASA and its partners by identifying, evaluating, and acquiring commercial satellite data.
For more information about NASA’s Commercial Satellite Acquisition program, visit:
NASA has selected eight new companies and will acquire new data products from six existing Commercial Satellite Data Acquisition contract holders to expand the range of commercial satellite data available to researchers, civil agencies, and decision-makers. Such measurements supplement NASA’s Earth satellites by contributing high-resolution and frequent observations to enhance the agency’s set of data.
Leveraging commercial data demonstrates NASA’s commitment to strong public-private partnerships, allowing the agency to expand scientific insight while reducing costs and accelerating the delivery of data to researchers and decision-makers.
Collectively, NASA and commercial Earth observations provide insight into our home planet – benefitting Americans, providing environmental intelligence, strengthening disaster response, and improving public safety.
The Commercial Satellite Data Acquisition Program On-Ramp 2 Multiple Award contract is a firm-fixed-price, indefinite-delivery/indefinite-quantity multiple-award contract. The original maximum contract value was $476 million, with a performance period that began in 2023 and continues through Nov. 15, 2028.
Contract awardees are:
Airbus DS Geo Inc.
GHGSat Inc.
Hydrosat Inc.
ICEYE US Inc.
ImageSat International
Kuva US Inc.
Muon Space Inc.
Orbital Sidekick Inc.
OroraTech USA Inc.
Planet Labs Federal Inc.
Space Sciences and Engineering LLC, doing business as PlanetiQ
SATLANTIS US
Tomorrow Companies Inc., doing business as Tomorrow.io
Wyvern Inc.
The agency’s Commercial Satellite Data Acquisition mission works to execute a cost-effective way to augment and complement the suite of Earth observations captured by NASA and its partners by identifying, evaluating, and acquiring commercial satellite data.
For more information about NASA’s Commercial Satellite Acquisition program, visit:
Even small asteroids lead complex lives. During its flyby of the asteroid Donaldjohanson last year, NASA’s Lucy spacecraft revealed the asteroid to be a wobbly, peanut-shaped body that has undergone a lot of activity in its relatively short history. Formed as fragments coalesced after a violent collision 155 million years ago, the asteroid was transformed by the small but inexorable force of the Sun’s radiation, all while retaining signs of the brief presence of liquid water in its distant past.
Zooming through the main asteroid belt toward one of the Jupiter Trojan asteroid groups, the Lucy spacecraft collected the first close-up images and other data at Donaldjohanson on April 20, 2025, as it passed 650 miles away from the asteroid. The data revealed that, instead of spinning simply around one axis like most other asteroids and planets, Donaldjohanson has a more complicated two-axis rotation. Scientists also saw Donaldjohanson’s peanut shape and the craters and ridges on its surface.
A timelapse video made from images taken by NASA’s Lucy spacecraft as it approached the asteroid Donaldjohanson on April 20, 2025. The L’LORRI (Lucy Long Range Reconnaissance Imager) instrument, the spacecraft’s high-resolution black-and-white imager, collected these images over two hours as the spacecraft rapidly closed in on the asteroid from an initial separation of more than 58,000 miles (93,000 km), until the spacecraft passed a mere 650 miles (1000 km) from the 5-mile- (8 km-) wide asteroid.
NASA/Goddard/SwRI/JHU-APL
Lucy’s encounter with the asteroid was planned as a dress rehearsal for the spacecraft and mission team before its primary asteroid encounters, which begin with Lucy’s flyby of the Trojan asteroid Eurybates on Aug. 12, 2027. The instruments performed as expected, and, as a bonus, scientists got a rare opportunity to study a previously unexplored asteroid up close and to compare it to two asteroids with similar compositions but different histories: Bennu, the target of NASA’s OSIRIS-REx sample-return mission, and Ryugu, the site of JAXA’s (Japan Aerospace Exploration Agency) Hayabusa2 sample-return mission.
With Earth-based telescopes, observers saw fluctuations in the light Donaldjohanson reflects, regular patterns of peaks and valleys, typical of an elongated object rotating once every 10.5 Earth days. But Lucy’s data revealed another pattern: Donaldjohanson appears to be rotating like a wobbly top. Paper authors reported that the asteroid rotates end-over-end once every 10.5 Earth days, and wobbles back and forth around its long axis once every 26.5 days.
The asteroid Donaldjohanson is shown slowly rotating in a tumbling, non-principal axis motion, with its angular momentum vector and rotation axes indicated. The surface is colored by gravity slope, which measures the angle between the local surface and the direction of gravity. Higher values (warmer colors) indicate steeper terrain relative to the local gravitational pull. Regions with limited stereo image coverage have been masked out where the shape model is less well constrained.
Kel Elkins/NASA’s Science Visualization Studio/DLR
Peanut shape
While the Earth-based observations hinted at Donaldjohanson’s elongated shape, the Lucy flyby revealed a “bilobate” structure: two lobes connected by a neck, like a peanut. These lobes are likely two fragments from an asteroid collision that gently came together afterward by their mutual gravity.
Donaldjohanson likely rotated at least 10 times faster when it formed, having slowed to its current rate in the last 20 to 60 million years, the team estimates. As it slowed, the balance between the centrifugal force pushing things apart and gravity pulling things together changed and loose rocky material slid down slopes creating the worn-down appearance of many craters, as the flyby images showed.
The paper’s authors say that the asteroid’s slowing rotation is likely caused by a subtle consequence of solar heating known as the YORP effect. Each part of the asteroid’s Sun-warmed surface radiates heat away as infrared light, and that radiation imparts a tiny recoil force to the surface. Because the asteroid’s shape isn’t symmetric, this results in a net torque, or twist, that can change the asteroid’s rotation. Thus, YORP can slow asteroid spins down or speed them up, as in the case of Bennu (once every four hours) and Ryugu (once about every seven hours), which both likely used to rotate much slower than they do today.
Fleeting water
As it passed by Donaldjohanson at 30,000 mph, Lucy recorded the signatures of iron-rich clay minerals on the surface. These clays must have formed in the distant past with the help of liquid water. However, the exposure must have been brief, Lucy scientists concluded, because iron in clays tends to be replaced with other elements, such as magnesium, as water lingers.
Indeed, scientists saw magnesium-rich clays at Bennu and Ryugu, which suggested prolonged water exposure, perhaps lasting millions of years, when they were still part of larger asteroids.
This difference in water exposure history, and other characteristics, may mean that the parent bodies of these asteroids formed at different times or in different regions of the solar system before relocating to the main belt.
Compare, contrast
Donaldjohanson is thought to be made from rocky remnants of a larger, carbon- and water-rich asteroid that collided with another object in the main asteroid belt. Bennu and Ryugu are thought to have formed in the same way and in the same region.
But Donaldjohanson is different. At 155 million years old, it is much younger than Bennu and Ryugu, which formed 1 to 2 billion years ago. Donaldjohanson also has remained in the asteroid belt since birth, while its wandering cousins migrated into orbits around the Sun that bring them close to Earth’s orbit about once a year (which made them perfect close targets for sample return missions).
During its April 20, 2025, encounter with the main-belt asteroid Donaldjohanson, NASA’s Lucy spacecraft discovered evidence for iron-rich clays on the surface using its infrared spectrometer. These clays, which are similar to those found in carbon-rich meteorites such as QUE 97990, indicate that water was briefly present in the asteroid during the distant past.
NASA/Goddard/SwRI/Dan Gallagher
“It’s helpful for scientists to compare Donaldjohanson with asteroids like Bennu and Ryugu, which are seemingly similar asteroids, because every subtle difference is another clue to our origin story,” said Simone Marchi, Lucy deputy principal investigator and lead author of the study at the Boulder, Colorado, office of the Southwest Research Institute.
“Once we start learning more about the Trojans, a completely different population of space rocks with very different histories, our understanding of solar system formation is destined to be challenged,” said Marchi.
Named after a fossilized skeleton of a human ancestor discovered in Ethiopia in 1974, NASA’s Lucy will be the first mission to explore Jupiter’s Trojan asteroids, a population of well-preserved space rocks that formed early in our solar system’s history and could help scientists understand how the planets formed and moved around before settling in their current configuration.
Lucy’s principal investigator 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 agency’s Science Mission Directorate in Washington.
For more information on NASA’s Lucy mission, visit:
Zooming through the main asteroid belt toward one of the Jupiter Trojan asteroid groups, the Lucy spacecraft collected the first close-up images and other data at Donaldjohanson on April 20, 2025, as it passed 650 miles away from the asteroid. The data revealed that, instead of spinning simply around one axis like most other asteroids and planets, Donaldjohanson has a more complicated two-axis rotation. Scientists also saw Donaldjohanson’s peanut shape and the craters and ridges on its surface.
Even small asteroids lead complex lives. During its flyby of the asteroid Donaldjohanson last year, NASA’s Lucy spacecraft revealed the asteroid to be a wobbly, peanut-shaped body that has undergone a lot of activity in its relatively short history. Formed as fragments coalesced after a violent collision 155 million years ago, the asteroid was transformed by the small but inexorable force of the Sun’s radiation, all while retaining signs of the brief presence of liquid water in its distant past.
Zooming through the main asteroid belt toward one of the Jupiter Trojan asteroid groups, the Lucy spacecraft collected the first close-up images and other data at Donaldjohanson on April 20, 2025, as it passed 650 miles away from the asteroid. The data revealed that, instead of spinning simply around one axis like most other asteroids and planets, Donaldjohanson has a more complicated two-axis rotation. Scientists also saw Donaldjohanson’s peanut shape and the craters and ridges on its surface.
A timelapse video made from images taken by NASA’s Lucy spacecraft as it approached the asteroid Donaldjohanson on April 20, 2025. The L’LORRI (Lucy Long Range Reconnaissance Imager) instrument, the spacecraft’s high-resolution black-and-white imager, collected these images over two hours as the spacecraft rapidly closed in on the asteroid from an initial separation of more than 58,000 miles (93,000 km), until the spacecraft passed a mere 650 miles (1000 km) from the 5-mile- (8 km-) wide asteroid.
NASA/Goddard/SwRI/JHU-APL
Lucy’s encounter with the asteroid was planned as a dress rehearsal for the spacecraft and mission team before its primary asteroid encounters, which begin with Lucy’s flyby of the Trojan asteroid Eurybates on Aug. 12, 2027. The instruments performed as expected, and, as a bonus, scientists got a rare opportunity to study a previously unexplored asteroid up close and to compare it to two asteroids with similar compositions but different histories: Bennu, the target of NASA’s OSIRIS-REx sample-return mission, and Ryugu, the site of JAXA’s (Japan Aerospace Exploration Agency) Hayabusa2 sample-return mission.
With Earth-based telescopes, observers saw fluctuations in the light Donaldjohanson reflects, regular patterns of peaks and valleys, typical of an elongated object rotating once every 10.5 Earth days. But Lucy’s data revealed another pattern: Donaldjohanson appears to be rotating like a wobbly top. Paper authors reported that the asteroid rotates end-over-end once every 10.5 Earth days, and wobbles back and forth around its long axis once every 26.5 days.
The asteroid Donaldjohanson is shown slowly rotating in a tumbling, non-principal axis motion, with its angular momentum vector and rotation axes indicated. The surface is colored by gravity slope, which measures the angle between the local surface and the direction of gravity. Higher values (warmer colors) indicate steeper terrain relative to the local gravitational pull. Regions with limited stereo image coverage have been masked out where the shape model is less well constrained.
Kel Elkins/NASA’s Science Visualization Studio/DLR
Peanut shape
While the Earth-based observations hinted at Donaldjohanson’s elongated shape, the Lucy flyby revealed a “bilobate” structure: two lobes connected by a neck, like a peanut. These lobes are likely two fragments from an asteroid collision that gently came together afterward by their mutual gravity.
Donaldjohanson likely rotated at least 10 times faster when it formed, having slowed to its current rate in the last 20 to 60 million years, the team estimates. As it slowed, the balance between the centrifugal force pushing things apart and gravity pulling things together changed and loose rocky material slid down slopes creating the worn-down appearance of many craters, as the flyby images showed.
The paper’s authors say that the asteroid’s slowing rotation is likely caused by a subtle consequence of solar heating known as the YORP effect. Each part of the asteroid’s Sun-warmed surface radiates heat away as infrared light, and that radiation imparts a tiny recoil force to the surface. Because the asteroid’s shape isn’t symmetric, this results in a net torque, or twist, that can change the asteroid’s rotation. Thus, YORP can slow asteroid spins down or speed them up, as in the case of Bennu (once every four hours) and Ryugu (once about every seven hours), which both likely used to rotate much slower than they do today.
Fleeting water
As it passed by Donaldjohanson at 30,000 mph, Lucy recorded the signatures of iron-rich clay minerals on the surface. These clays must have formed in the distant past with the help of liquid water. However, the exposure must have been brief, Lucy scientists concluded, because iron in clays tends to be replaced with other elements, such as magnesium, as water lingers.
Indeed, scientists saw magnesium-rich clays at Bennu and Ryugu, which suggested prolonged water exposure, perhaps lasting millions of years, when they were still part of larger asteroids.
This difference in water exposure history, and other characteristics, may mean that the parent bodies of these asteroids formed at different times or in different regions of the solar system before relocating to the main belt.
Compare, contrast
Donaldjohanson is thought to be made from rocky remnants of a larger, carbon- and water-rich asteroid that collided with another object in the main asteroid belt. Bennu and Ryugu are thought to have formed in the same way and in the same region.
But Donaldjohanson is different. At 155 million years old, it is much younger than Bennu and Ryugu, which formed 1 to 2 billion years ago. Donaldjohanson also has remained in the asteroid belt since birth, while its wandering cousins migrated into orbits around the Sun that bring them close to Earth’s orbit about once a year (which made them perfect close targets for sample return missions).
During its April 20, 2025, encounter with the main-belt asteroid Donaldjohanson, NASA’s Lucy spacecraft discovered evidence for iron-rich clays on the surface using its infrared spectrometer. These clays, which are similar to those found in carbon-rich meteorites such as QUE 97990, indicate that water was briefly present in the asteroid during the distant past.
NASA/Goddard/SwRI/Dan Gallagher
“It’s helpful for scientists to compare Donaldjohanson with asteroids like Bennu and Ryugu, which are seemingly similar asteroids, because every subtle difference is another clue to our origin story,” said Simone Marchi, Lucy deputy principal investigator and lead author of the study at the Boulder, Colorado, office of the Southwest Research Institute.
“Once we start learning more about the Trojans, a completely different population of space rocks with very different histories, our understanding of solar system formation is destined to be challenged,” said Marchi.
Named after a fossilized skeleton of a human ancestor discovered in Ethiopia in 1974, NASA’s Lucy will be the first mission to explore Jupiter’s Trojan asteroids, a population of well-preserved space rocks that formed early in our solar system’s history and could help scientists understand how the planets formed and moved around before settling in their current configuration.
Lucy’s principal investigator 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 agency’s Science Mission Directorate in Washington.
For more information on NASA’s Lucy mission, visit:
Zooming through the main asteroid belt toward one of the Jupiter Trojan asteroid groups, the Lucy spacecraft collected the first close-up images and other data at Donaldjohanson on April 20, 2025, as it passed 650 miles away from the asteroid. The data revealed that, instead of spinning simply around one axis like most other asteroids and planets, Donaldjohanson has a more complicated two-axis rotation. Scientists also saw Donaldjohanson’s peanut shape and the craters and ridges on its surface.
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