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By NASA
3 min read
NASA Develops Process to Create Very Accurate Eclipse Maps
New NASA research reveals a process to generate extremely accurate eclipse maps, which plot the predicted path of the Moon’s shadow as it crosses the face of Earth. Traditionally, eclipse calculations assume that all observers are at sea level on Earth and that the Moon is a smooth sphere that is perfectly symmetrical around its center of mass. As such, these calculations do not take into account different elevations on Earth or the Moon’s cratered, uneven surface.
For slightly more accurate maps, people can employ elevation tables and plots of the lunar limb — the edge of the visible surface of the Moon as seen from Earth. However, now eclipse calculations have gained even greater accuracy by incorporating lunar topography data from NASA’s LRO (Lunar Reconnaissance Orbiter) observations.
Using LRO elevation maps, NASA visualizer Ernie Wright at NASA’s Goddard Space Flight Center in Greenbelt, Maryland, created a continuously varying lunar limb profile as the Moon’s shadow passes over the Earth. The mountains and valleys along the edge of the Moon’s disk affect the timing and duration of totality by several seconds. Wright also used several NASA data sets to provide an elevation map of Earth so that eclipse observer locations were depicted at their true altitude.
The resulting visualizations show something never seen before: the true, time-varying shape of the Moon’s shadow, with the effects of both an accurate lunar limb and the Earth’s terrain.
“Beginning with the 2017 total solar eclipse, we’ve been publishing maps and movies of eclipses that show the true shape of the Moon’s central shadow — the umbra,” said Wright.
A map showing the umbra (the Moon’s central shadow) as it passes over Cleveland at 3:15 p.m. local time during the April 8, 2024, total solar eclipse. NASA SVS/Ernie Wright and Michaela Garrison “And people ask, why does it look like a potato instead of a smooth oval? The short answer is that the Moon isn’t a perfectly smooth sphere.”
The mountains and valleys around the edge of the Moon change the shape of the shadow. The valleys are also responsible for Baily’s beads and the diamond ring, the last bits of the Sun visible just before and the first just after totality.
A computer simulation of Baily’s beads during a total solar eclipse. Data from Lunar Reconnaissance Orbiter makes it possible to map the lunar valleys that create the bead effect. NASA SVS/Ernie Wright Wright is lead author of a paper published September 19 in The Astronomical Journal that reveals for the first time exactly how the Moon’s terrain creates the umbra shape. The valleys on the edge of the Moon act like pinholes projecting images of the Sun onto the Earth’s surface.
A visualization of Sun images being projected from lunar valleys that are acting like pinhole projectors. Light rays from the Sun converge on each valley, then spread out again on their way to the Earth. NASA SVS/Ernie Wright The umbra is the small hole in the middle of these projected Sun images, the place where none of the Sun images reach.
Viewed from behind the Moon, the Sun images projected by lunar valleys on the Moon’s edge fall on the Earth’s surface in a flower-like pattern with a hole in the middle, forming the umbra shape. NASA SVS/Ernie Wright The edges of the umbra are made up of small arcs from the edges of the projected Sun images.
This is just one of several surprising results that have emerged from the new eclipse mapping method described in the paper. Unlike the traditional method invented 200 years ago, the new way renders eclipse maps one pixel at a time, the same way 3D animation software creates images. It’s also similar to the way other complex phenomena, like weather, are modeled in the computer by breaking the problem into millions of tiny pieces, something computers are really good at, and something that was inconceivable 200 years ago.
For more about eclipses, refer to:
https://science.nasa.gov/eclipses
By Ernie Wright and Susannah Darling
NASA’s Goddard Space Flight Center, Greenbelt, Md.
Media Contact:
Nancy Neal-Jones
NASA’s Goddard Space Flight Center, Greenbelt, Md.
301-286-0039
nancy.n.jones@nasa.gov
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Last Updated Sep 19, 2024 Editor wasteigerwald Contact wasteigerwald william.a.steigerwald@nasa.gov Location NASA Goddard Space Flight Center Related Terms
Lunar Reconnaissance Orbiter (LRO) Solar Eclipses Uncategorized Explore More
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By NASA
5 Min Read Reinventing the Clock: NASA’s New Tech for Space Timekeeping
The Optical Atomic Strontium Ion Clock is a higher-precision atomic clock that is small enough to fit on a spacecraft. Credits: NASA/Matthew Kaufman Here on Earth, it might not matter if your wristwatch runs a few seconds slow. But crucial spacecraft functions need accuracy down to one billionth of a second or less. Navigating with GPS, for example, relies on precise timing signals from satellites to pinpoint locations. Three teams at NASA’s Goddard Space Flight Center in Greenbelt, Maryland, are at work to push timekeeping for space exploration to new levels of precision.
One team develops highly precise quantum clock synchronization techniques to aid essential spacecraft communication and navigation. Another Goddard team is working to employ the technique of clock synchronization in space-based platforms to enable telescopes to function as one enormous observatory. The third team is developing an atomic clock for spacecraft based on strontium, a metallic chemical element, to enable scientific observations not possible with current technology. The need for increasingly accurate timekeeping is why these teams at NASA Goddard, supported by the center’s Internal Research and Development program, hone clock precision and synchronization with innovative technologies like quantum and optical communications.
Syncing Up Across the Solar System
“Society requires clock synchronization for many crucial functions like power grid management, stock market openings, financial transactions, and much more,” said Alejandro Rodriguez Perez, a NASA Goddard researcher. “NASA uses clock synchronization to determine the position of spacecraft and set navigation parameters.”
If you line up two clocks and sync them together, you might expect that they will tick at the same rate forever. In reality, the more time passes, the more out of sync the clocks become, especially if those clocks are on spacecraft traveling at tens of thousands of miles per hour. Rodriguez Perez seeks to develop a new way of precisely synchronizing such clocks and keeping them synced using quantum technology.
Work on the quantum clock synchronization protocol takes place in this lab at NASA’s Goddard Space Flight Center in Greenbelt, Md.NASA/Matthew Kaufman In quantum physics, two particles are entangled when they behave like a single object and occupy two states at once. For clocks, applying quantum protocols to entangled photons could allow for a precise and secure way to sync clocks across long distances.
The heart of the synchronization protocol is called spontaneous parametric down conversion, which is when one photon breaks apart and two new photons form. Two detectors will each analyze when the new photons appear, and the devices will apply mathematical functions to determine the offset in time between the two photons, thus synchronizing the clocks.
While clock synchronization is currently done using GPS, this protocol could make it possible to precisely synchronize clocks in places where GPS access is limited, like the Moon or deep space.
Syncing Clocks, Linking Telescopes to See More than Ever Before
When it comes to astronomy, the usual rule of thumb is the bigger the telescope, the better its imagery.
“If we could hypothetically have a telescope as big as Earth, we would have incredibly high-resolution images of space, but that’s obviously not practical,” said Guan Yang, an optical physicist at NASA Goddard. “What we can do, however, is have multiple telescopes in various locations and have each telescope record the signal with high time precision. Then we can stich their observations together and produce an ultra-high-res image.”
The idea of linking together the observations of a network of smaller telescopes to affect the power of a larger one is called very long baseline interferometry, or VLBI.
For VLBI to produce a whole greater than the sum of its parts, the telescopes need high-precision clocks. The telescopes record data alongside timestamps of when the data was recorded. High-powered computers assemble all the data together into one complete observation with greater detail than any one of the telescopes could achieve on its own. This technique is what allowed the Event Horizon Telescope’s network of observatories to produce the first image of a black hole at the center of our galaxy.
The Event Horizon Telescope (EHT) — a planet-scale array of eight ground-based radio telescopes forged through international collaboration — was designed to capture images of a black hole. Although the telescopes making up the EHT are not physically connected, they are able to synchronize their recorded data with atomic clocks.EHT Collaboration Yang’s team is developing a clock technology that could be useful for missions looking to take the technique from Earth into space which could unlock many more discoveries.
An Optical Atomic Clock Built for Space Travel
Spacecraft navigation systems currently rely on onboard atomic clocks to obtain the most accurate time possible. Holly Leopardi, a physicist at NASA Goddard, is researching optical atomic clocks, a more precise type of atomic clock.
While optical atomic clocks exist in laboratory settings, Leopardi and her team seek to develop a spacecraft-ready version that will provide more precision.
The team works on OASIC, which stands for Optical Atomic Strontium Ion Clock. While current spacecraft utilize microwave frequencies, OASIC uses optical frequencies.
The Optical Atomic Strontium Ion Clock is a higher-precision atomic clock that is small enough to fit on a spacecraft.NASA/Matthew Kaufman “Optical frequencies oscillate much faster than microwave frequencies, so we can have a much finer resolution of counts and more precise timekeeping,” Leopardi said.
The OASIC technology is about 100 times more precise than the previous state-of-the-art in spacecraft atomic clocks. The enhanced accuracy could enable new types of science that were not previously possible.
“When you use these ultra-high precision clocks, you can start looking at the fundamental physics changes that occur in space,” Leopardi said, “and that can help us better understand the mechanisms of our universe.”
The timekeeping technologies unlocked by these teams, could enable new discoveries in our solar system and beyond.
More on cutting-edge technology development at NASA Goddard By Matthew Kaufman, with additional contributions from Avery Truman
NASA’s Goddard Space Flight Center, Greenbelt, Md.
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Last Updated Sep 18, 2024 EditorRob GarnerContactRob Garnerrob.garner@nasa.govLocationGoddard Space Flight Center Related Terms
Goddard Technology Communicating and Navigating with Missions Goddard Space Flight Center Technology View the full article
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By Space Force
Chief Master Sgt. of the Space Force John Bentivegna announces his three key initiatives and the new enlisted roadmap during the Air and Space Forces Association’s Air, Space & Cyber Conference.
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By NASA
Podcast art for Universo curioso de la NASA, the agency’s first podcast in Spanish, which returns for a second season in September 2024. Credits: NASA / Krystofer Kim Read this news release in English here.
Para celebrar el Mes de la Herencia Hispana, la NASA publica nuevos contenidos para Universo curioso de la NASA, el primer pódcast en español de la agencia, que inicia ahora su segunda temporada. La temporada de cinco semanas comienza el martes, con nuevos episodios disponibles semanalmente.
Escucha el avance de la segunda temporada de Universo curioso de la NASA.
En cada episodio, Universo curioso destaca las contribuciones de la fuerza laboral hispana y latina de la NASA al trabajo de la agencia en el ámbito de la exploración de la Tierra y el espacio en beneficio de todos.
“Mediante el pódcast Universo curioso de la NASA, estamos entusiasmados de contar la historia de los esfuerzos de la NASA para que el espacio esté al alcance de más gente de todo el mundo”, dijo Tonya McNair, administradora asociada adjunta de la Dirección de Misiones de Operaciones Espaciales de la NASA en Washington. “En la segunda temporada, escucharán a trabajadores hispanos y latinos de la NASA, como la directora de vuelo Diana Trujillo y el astronauta Marcos Berríos, que ayudan a dirigir algunas de las misiones de exploración espacial más vitales de la agencia e inspiran al mundo a través del descubrimiento.”
Los episodios se centran en algunas de las principales misiones de la NASA, acercando las maravillas de la exploración, la tecnología espacial y los descubrimientos científicos al público hispanohablante del mundo entero.
“Este pódcast pone en relieve la dedicación de la NASA a hacer que el conocimiento esté a disposición de todos, independientemente de su lengua materna”, dijo Shahra Lambert, asesora principal de la NASA para la participación pública. “Al compartir la emoción de las misiones de la NASA en el segundo idioma más hablado en los EE.UU. y en todo el mundo, estamos amplificando nuestro alcance y posiblemente allanando el camino para una fuerza de trabajo en ciencia, tecnología, ingeniería y matemáticas más diversa en el futuro.”
El primer episodio de Universo curioso se emitió en 2021, como parte de la cobertura en español del lanzamiento del telescopio espacial James Webb. En 2023, el programa fue seleccionado como “Programa que nos encanta” por Apple Podcasts Latinoamérica.
Presentado por Noelia González, especialista en comunicaciones del Centro Goddard de Vuelo Espacial de la NASA en Greenbelt, Maryland, en el pódcast invitamos a los oyentes a emprender un viaje a una de las lunas heladas de Júpiter, a oír acerca de los dos primeros años de descubrimientos del telescopio espacial James Webb, así como a conocer la trayectoria de un astronauta de Puerto Rico y de una directora de vuelo colombiana para llegar a la NASA.
Los episodios cubrirán el próximo lanzamiento de Europa Clipper en octubre de 2024, una misión que tiene como objetivo determinar si existen lugares bajo la superficie de la luna helada de Júpiter, Europa, que puedan albergar vida.
A continuación figura la lista completa de los nuevos episodios, así como sus fechas de publicación:
Martes, 17 de septiembre: Avance de la segunda temporada Martes, 24 de septiembre: Diana Trujillo: De Cali a la Luna y Marte Martes, 1 de octubre: Europa Clipper: Un viaje poético a la luna de Júpiter Martes, 8 de octubre: Marcos Berríos: Cómo convertirse en astronauta de la NASA Martes, 15 de octubre: Explorando el cosmos con Webb Universo curioso de la NASA es una iniciativa conjunta de los programas de comunicación en español y de audio de la agencia. La nueva temporada, así como los episodios anteriores, están disponibles en Apple Podcasts, Spotify y el sitio web de la NASA.
Escucha el pódcast en:
https://www.nasa.gov/universo-curioso-de-la-nasa
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María José Viñas / Cheryl Warner
Sede, Washington
240-458-0248 / 202-358-1600
maria-jose.vinasgarcia@nasa.gov / cheryl.m.warner@nasa.gov
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By NASA
Podcast art for Universo curioso de la NASA, the agency’s first podcast in Spanish, which returns for a second season in September 2024. Credits: NASA / Krystofer Kim Lee este comunicado de prensa en español aquí.
In celebration of Hispanic Heritage Month, NASA is releasing new content for Universo curioso de la NASA, the agency’s first Spanish-language podcast, now in its second season. A five-week season starts Tuesday with new episodes released weekly.
Listen to the preview of the second season of Universo curioso de la NASA.
In each episode, Universo curioso highlights the contributions of NASA’s Hispanic and Latino workforce to the agency’s work in Earth and space exploration for the benefit of all.
“Through the Universo curioso de la NASA podcast, we are thrilled to tell the story of NASA’s efforts to open space to more people from across the world,” said Tonya McNair, deputy associate administrator for NASA’s Space Operations Mission Directorate in Washington. “In the second season, you’ll hear from NASA’s Hispanic and Latino workforce, like flight director Diana Trujillo and astronaut Marcos Berríos, helping lead some of the agency’s most vital space exploration missions and inspiring the world through discovery.”
Episodes focus on some of NASA’s top missions, bringing the wonder of exploration, space technology, and scientific discoveries to Spanish-speaking audiences around the world.
“This podcast highlights NASA’s dedication to making knowledge available to all, regardless of their native language,” said Shahra Lambert, NASA senior advisor for engagement. “By sharing the excitement of NASA’s missions in the second most spoken language in the U.S. and around the world, we are amplifying our outreach and possibly paving the way for a more diverse STEM workforce in the future.”
The first episode of Universo curioso ran in 2021, as part of the agency’s Spanish coverage of the launch of its James Webb Space Telescope. In 2023, the show was selected as a “Podcast We Love” by Apple Podcasts Latin America.
Hosted by Noelia González, communications specialist at NASA’s Goddard Space Flight Center in Greenbelt, Maryland, listeners are invited to go on a journey to one of Jupiter’s icy moons, hear about the first two years of discoveries of the James Webb Space Telescope, as well as learn about an astronaut from Puerto Rico’s and a Colombian flight director’s path to NASA.
Episodes will cover the upcoming launch of Europa Clipper in October 2024, a mission that aims to determine whether there are places below the surface of Jupiter’s icy moon, Europa, that could support life.
A complete list of the new episodes, as well as their release dates, is as follows:
Tuesday, Sept. 17: Introducing the Second Season Tuesday, Sept. 24 Diana Trujillo: From Cali to the Moon and Mars Tuesday, Oct. 1 Europa Clipper: A Poetic Journey to Jupiter’s Moon Tuesday, Oct. 8 Marcos Berríos: How to Become a NASA Astronaut Tuesday, Oct. 15: Exploring Cosmos with Webb Universo curioso de la NASA is a joint initiative of the agency’s Spanish-language communications and audio programs. The new season, as well as previous episodes, are available on Apple Podcasts, Spotify, and NASA’s website.
Listen to the podcast at:
https://www.nasa.gov/universo-curioso-de-la-nasa
-end-
María José Viñas / Cheryl Warner
Headquarters, Washington
240-458-0248 / 202-358-1600
maria-jose.vinasgarcia@nasa.gov / cheryl.m.warner@nasa.gov
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