the voyager tracker

The remarkable twin Voyager spacecraft continue to explore the outer reaches of the solar system decades after they completed their surveys of the Outer Planets.  Launched in 1977 (September 5 for Voyager 1 (V1) and August 20 for Voyager 2 (V2), whose trajectory took it past Jupiter after Voyager 1), the spacecraft pair made many fundamental discoveries as they flew past Jupiter (March 1979 for V1, July 1979 for V2) and Saturn (November 1980 for V1, August 1981 for V2).  The path of Voyager 2 past Saturn was targeted so that it continued within the plane of the solar system, allowing it to become the first spacecraft to visit Uranus (January 1986) and Neptune (August 1989).  Following the Neptune encounter, both spacecraft started a new phase of exploration under the intriguing title of the Voyager Interstellar Mission.

Five instruments continue to collect important measurements of magnetic fields, plasmas, and charged particles as both spacecraft explore different portions of the solar system beyond the orbits of the planets.  Voyager 1 is now more than 118 astronomical units (one AU is equal to the average orbital distance of Earth from the Sun) distant from the sun, traveling at a speed (relative to the sun) of 17.1 kilometers per second (10.6 miles per second).  Voyager 2 is now more than 96 AU from the sun, traveling at a speed of 15.5 kilometers per second (9.6 miles per second).  Both spacecraft are moving considerably faster than Pioneers 10 and 11, two earlier spacecraft that became the first robotic visitors to fly past Jupiter and Saturn in the mid-70s.

This processed color image of Jupiter was produced in 1990 by the U.S. Geological Survey from a Voyager image captured in 1979. The colors have been enhanced to bring out detail. Zones of light-colored, ascending clouds alternate with bands of dark, descending clouds. The clouds travel around the planet in alternating eastward and westward belts at speeds of up to 540 kilometers per hour. Tremendous storms as big as Earthly continents surge around the planet. The Great Red Spot (oval shape toward the lower-left) is an enormous anticyclonic storm that drifts along its belt, eventually circling the entire planet.

As seen in the night sky at Earth, Voyager 1 is within the confines of the constellation Ophiuchus, only slightly above the celestial equator; no telescope can see it, but radio contact is expected to be maintained for at least the next ten years.  Voyager 2 is within the bounds of the constellation Telescopium (which somehow sounds quite appropriate) in the far southern night sky.

Both spacecraft have already passed something called the Termination Shock † (December 2004 for V1, August 2007 for V2), where the solar wind slows as it starts to interact with the particles and fields present between the stars.  It is expected that both spacecraft will encounter the Heliopause, where the solar wind ceases as true interstellar space begins, from 10 to 20 years after crossing the Termination Shock.  Theories exist for what should be present in interstellar space, but the Voyagers will become the first man-made objects to go beyond the influences of the Sun, hopefully returning the first measurements of what it is like out there.  Each spacecraft is carrying a metal record with encoded sounds and sights from Earth, along with the needle needed to read the recordings, and simplified instructions for where the spacecraft came from, in case they are eventually discovered by intelligent extra-terrestrials.

Keep track of the Voyager spacecraft on the official  Voyager Interstellar Mission website or follow  @NASAVoyager2 on Twitter.    † The sun ejects a continuous stream of charged particles (electrons, protons, etc) that is collectively termed the solar wind.  The particles are traveling extremely fast and are dense enough to form a very tenuous atmosphere; the heliosphere represents the volume of space where the effects of the solar wind dominate over those of particles in interstellar space.  The solar wind particles are moving very much faster than the local speed of sound represented by their low volume density.  When the particles begin to interact with interstellar particles and fields (the interaction can be either physically running into other particles or experiencing an electromagnetic force resulting from a charged particle moving within a magnetic field), then they start to slow down.  The point at which they become subsonic (rather than their normal hypersonic speed) is the Termination Shock.

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Voyager 1 is back online! NASA's most distant spacecraft returns data from all 4 instruments

The spacecraft has resumed full science operations after a technical issue began creating complications in November 2023.

All right, everyone — we can all breathe a sigh of relief. NASA's Voyager 1 spacecraft is fully operational once more, with all four science instruments returning usable data to Earth.

The problems began in November 2023, when Voyager 1 lost its ability to "speak" with us. More specifically, it started sending to Earth unintelligible data instead of its normal 0s and 1s of binary code. Of course, Voyager 1 is 46 years old — ancient for a spacecraft — so it wasn't entirely a surprise that its health might be waning. And that's not to mention that it's in entirely uncharged interstellar territory, some 15 billion miles (24 billion kilometers) from Earth. 

Voyager 1's dogged team was determined to not only figure out what went wrong, but also to fix the problem. And they've succeeded! Controllers identified where the issue was located: the flight data subsystem (FDS), used to "package" data to be sent to Earth. Further sleuthing revealed the exact chip causing the problem, which allowed them to find a workaround. After the team relocated the code to a new location in the FDS, Voyager 1 finally sent back intelligible data on April 20, 2024 — but only from two of its four science instruments. Now, just two months later, Voyager 1's remaining two science instruments are back up and running, communicating effectively with mission control on Earth.

Even if Voyager 1 had gone dark for good, however, the mission would still have been a wild success. After it launched in 1977, its primary mission was to study Jupiter and Saturn — that was accomplished by 1980. (Its twin spacecraft, Voyager 2 , went on to study Uranus and Neptune .) But Voyager 1 is on an unstoppable path. Continuing its journey away from Earth, the spacecraft entered interstellar space in 2012, returning crucial data about this mysterious realm.

 — Voyager: 15 incredible images of our solar system (gallery) — Scientists' predictions for the long-term future of the Voyager Golden Records will blow your mind — Ed Stone, who led NASA's iconic Voyager project for 50 years, dies at 88  

Now that Voyager 1 is back online, the team will continue to "touch up" the spacecraft to get it back in top form, including resynchronizing its timekeeping software to execute commands at the right time , as well as performing maintenance on the digital tape recorder that measures plasma waves. And hopefully, Voyager 1 will have a long, happy life ahead.

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Space.com contributing writer Stefanie Waldek is a self-taught space nerd and aviation geek who is passionate about all things spaceflight and astronomy. With a background in travel and design journalism, as well as a Bachelor of Arts degree from New York University, she specializes in the budding space tourism industry and Earth-based astrotourism. In her free time, you can find her watching rocket launches or looking up at the stars, wondering what is out there. Learn more about her work at www.stefaniewaldek.com .

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Voyager 1 and 2: The Interstellar Mission

An image of Neptune taken by the Voyager 2 spacecraft. Image credit: NASA

NASA has beautiful photos of every planet in our solar system. We even have images of faraway Neptune , as you can see in the photo above.

Neptune is much too distant for an astronaut to travel there with a camera. So, how do we have pictures from distant locations in our solar system? Our photographers were two spacecraft, called Voyager 1 and Voyager 2!

An artist’s rendering of one of the Voyager spacecraft. Image credit: NASA

The Voyager 1 and 2 spacecraft launched from Earth in 1977. Their mission was to explore Jupiter and Saturn —and beyond to the outer planets of our solar system. This was a big task. No human-made object had ever attempted a journey like that before.

The two spacecraft took tens of thousands of pictures of Jupiter and Saturn and their moons. The pictures from Voyager 1 and 2 allowed us to see lots of things for the first time. For example, they captured detailed photos of Jupiter's clouds and storms, and the structure of Saturn's rings .

Image of storms on Jupiter taken by the Voyager 1 spacecraft. Image credit: NASA

Voyager 1 and 2 also discovered active volcanoes on Jupiter's moon Io , and much more. Voyager 2 also took pictures of Uranus and Neptune. Together, the Voyager missions discovered 22 moons.

Since then, these spacecraft have continued to travel farther away from us. Voyager 1 and 2 are now so far away that they are in interstellar space —the region between the stars. No other spacecraft have ever flown this far away.

Where will Voyager go next?

Watch this video to find out what's beyond our solar system!

Both spacecraft are still sending information back to Earth. This data will help us learn about conditions in the distant solar system and interstellar space.

The Voyagers have enough fuel and power to operate until 2025 and beyond. Sometime after this they will not be able to communicate with Earth anymore. Unless something stops them, they will continue to travel on and on, passing other stars after many thousands of years.

Each Voyager spacecraft also carries a message. Both spacecraft carry a golden record with scenes and sounds from Earth. The records also contain music and greetings in different languages. So, if intelligent life ever find these spacecraft, they may learn something about Earth and us as well!

A photo of the golden record that was sent into space on both Voyager 1 and Voyager 2. Image credit: NASA/JPL-Caltech

More about our universe!

Where does interstellar space begin?

Searching for other planets like ours

Play Galactic Explorer!

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NASA’s Voyager 1, the most distant spacecraft from Earth, is doing science again after problem

FILE - This illustration provided by NASA depicts Voyager 1. The most distant spacecraft from Earth stopped sending back understandable data in November 2023. The Jet Propulsion Laboratory in Southern California announced this week that Voyager 1’s four scientific instruments are back in business after a technical snafu in November. (NASA via AP, File)

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DALLAS (AP) — NASA’s Voyager 1, the most distant spacecraft from Earth, is sending science data again.

Voyager 1’s four instruments are back in business after a computer problem in November, the Jet Propulsion Laboratory said this week. The team first received meaningful information again from Voyager 1 in April, and recently commanded it to start studying its environment again.

Launched in 1977, Voyager 1 is drifting through interstellar space, or the space between star systems. Before reaching this region, the spacecraft discovered a thin ring around Jupiter and several of Saturn’s moons. Its instruments are designed to collect information about plasma waves, magnetic fields and particles.

Voyager 1 is over 15 billion miles (24.14 kilometers) from Earth. Its twin Voyager 2 — also in interstellar space — is more than 12 billion miles (19.31 kilometers) miles away.

The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Science and Educational Media Group. The AP is solely responsible for all content.

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Voyager 1 Trajectory through the Solar System

Visualization centered on the Voyager 1 trajectory through the solar system.

A slightly sped-up version of the Voyager 1 visualization above, reducing the time for the Voyagers to cross the asteroid belt.

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Hubble’s Brand New Image of Jupiter

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June 14, 2024

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Voyager 1 returning science data from all four instruments

NASA's Voyager 1 spacecraft is conducting normal science operations for the first time following a technical issue that arose in November 2023.

The team partially resolved the issue in April when they prompted the spacecraft to begin returning engineering data, which includes information about the health and status of the spacecraft. On May 19, the mission team executed the second step of that repair process and beamed a command to the spacecraft to begin returning science data.

Two of the four science instruments returned to their normal operating modes immediately. Two other instruments required some additional work, but now, all four are returning usable science data.

The four instruments study plasma waves , magnetic fields, and particles. Voyager 1 and Voyager 2 are the only spacecraft to directly sample interstellar space , which is the region outside the heliosphere—the protective bubble of magnetic fields and solar wind created by the sun.

While Voyager 1 is back to conducting science, additional minor work is needed to clean up the effects of the issue. Among other tasks, engineers will resynchronize timekeeping software in the spacecraft's three onboard computers so they can execute commands at the right time.

The team will also perform maintenance on the digital tape recorder, which records some data for the plasma wave instrument that is sent to Earth twice per year. (Most of the Voyagers' science data is sent directly to Earth and not recorded.)

Voyager 1 is more than 15 billion miles (24 billion kilometers) from Earth, and Voyager 2 is more than 12 billion miles (20 billion kilometers) from the planet. The probes will mark 47 years of operations later this year. They are NASA's longest-running and most-distant spacecraft. Both spacecraft flew past Jupiter and Saturn, while Voyager 2 also flew past Uranus and Neptune.

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Voyager 1 position calculator.

Compute the position of Voyager 1 for any date and time between 1 January 2013 and 30 December 2099 and visualize the results on an interactive sky map.

Voyager 1 is currently in the constellation of Ophiucus , at a distance of 24,371,683,866 kilometers from Earth. The current Right Ascension of Voyager 1 is 17h 14m 57s and the Declination is +12° 25’ 29” (topocentric coordinates computed for the selected location: Greenwich, United Kingdom ).

Voyager 1 is a space probe launched by NASA on September 5, 1977, to study the outer Solar System and beyond. It is currently the most distant human-made object from Earth, having traveled over 14 billion miles (23 billion kilometers) from the Sun. Voyager 1's mission has included flybys of Jupiter and Saturn, with the goal of studying their moons, rings, and magnetic fields. The probe is now traveling through the heliosheath , the outermost layer of the Sun's heliosphere, and is expected to enter interstellar space in the coming years. Voyager 1 carries a golden record that contains sounds and images selected to portray the diversity of life and culture on Earth, in the event that it is ever encountered by extraterrestrial life.

Today's rise, transit and set times of Voyager 1 from Greenwich, United Kingdom (all times relative to the local timezone Europe/London):

• Voyager 1 is above the horizon from Greenwich, United Kingdom .
• Right now it is placed in the South direction at an altitude of 51° above the horizon.
• Go to interactive sky chart

If you need to access this information frequently for your observations, you can create a simple customized Quick Access page , so that you can easily bookmark it in your browser favorites or add a shortcut to your mobile phones' home screen.

• Position and finder charts (see also Where is Voyager 1? )
• Distance from Earth (see also How far is Voyager 1 from Earth? )
• When does Voyager 1 rise and set?
• Interactive orbit visualization . 3d visualization showing the orbit of Voyager 1 with respect to the major Solar System objects.
• 15 days ephemerides . Table showing celestial coordinates and magnitude of Voyager 1 for the past and next 7 days.
• Interactive sky chart . An online planetarium application that shows where to locate Voyager 1 in the sky from your location.
• Live position tracker . A high precision sky chart that uses real deep sky imagery to help locate Voyager 1 with your telescope or on your astrophotographies.

Voyager 1 Position and Finder Charts

Higher precision deep sky finder chart, 60 arcmin wide, showing where Voyager 1 is right now. Click on the image to see a more detailed fullscreen tracker view .

Also check out Where is Voyager 1? , a page that provides all the information needed to find Voyager 1 in the sky and additional links to sky charts.

Voyager 1 Distance from Earth

The distance of Voyager 1 from Earth is currently 24,371,683,866 kilometers, equivalent to 162.914644 Astronomical Units . Light takes 22 hours, 34 minutes and 55.1868 seconds to travel from Voyager 1 and arrive to us.

The following chart shows the distance of Voyager 1 from Earth as a function of time. In the chart the distance data is measured in Astronomical Units and sampled with an interval of 1 day.

Closest Approach of Voyager 1 to Earth

NOTE: values for the closest approach are computed with a sampling interval of 1 day.

Visualization of Voyager 1 Orbit

This 3d orbit diagram is a feature of our 3D Solar System Simulator and shows the orbit of Voyager 1 with respect of the Sun and the orbits of the major planets . The position of Voyager 1 and the planets along their orbits in this diagram accurately represents the current configuration of the objects in the Solar System. This is an experimental feature and it requires a WebGL enabled browser. Please provide us feedback !

Voyager 1 15 Days Ephemeris

The following table lists the ephemerides of Voyager 1 computed for the past and next 7 days, with a 24 hours interval. Click on each row of the table to locate Voyager 1 in our Online Planetarium at the chosen date.

Voyager 1 Ephemeris Calculator

Compute the position of Voyager 1 for any date and time between 1 January 2013 and 30 December 2099 and display the results on an interactive star map.

Interstellar Mission

Voyager 1 reached interstellar space in August 2012 and is the most distant human-made object in existence.

Mission Statistics

Launch Date

Sept. 5, 1977

About the mission

Voyager 1 reached interstellar space in August 2012 and is the most distant human-made object in existence. Launched just shortly after its twin spacecraft, Voyager 2, in 1977, Voyager 1 explored the Jovian and Saturnian systems discovering new moons, active volcanoes and a wealth of data about the outer solar system.

Voyagers 1 and 2 were designed to take advantage of a rare planetary alignment that occurs only once in 176 years and remain the most well traveled spacecraft in history. Both spacecraft carry a sort of time capsule called the Golden Record, a 12-inch gold-plated copper disk containing sounds and images selected to portray the story of our world to extraterrestrials.

Instruments

• Imaging system
• Infrared interferometer spectrometer
• Ultraviolet spectrometer
• Triaxial fluxgate magnetometer
• Plasma spectrometer
• Low-energy charged particles detectors
• Cosmic Ray System (CRS)
• Photopolarimeter System (PPS)
• Plasma Wave System (PWS)

Mission Highlights

Sept. 1, 2013

Interactive 3D model of Voyager 1. View the full interactive experience at Eyes on the Solar System .

NASA's Voyager Has Made a Full Recovery After Glitch Nearly Ended the Historic Mission

The iconic mission has resumed regular science operations for the first time since november 2023..

Voyager fans, rejoice! The 46-year-old spacecraft is once again probing interstellar space for cosmic wonders following a seven month-long hiatus.

Related Content

NASA announced that its iconic mission is back to normal operations, with all four of its instruments returning science data for the first time following a technical issue that first began in November 2023.

Voyager 1 launched in 1977, so it’s operating on vintage tech. The storied spacecraft is exploring the outermost edge of the Sun’s domain, combining its observations with data from newer missions to get a better understanding of how the heliosphere interacts with interstellar space. For decades, the spacecraft has been a reliable source of data on the universe, discovering new moons, active volcanoes, and planetary rings.

Late last year, however, the spacecraft started talking back to Earth in unusable gibberish . In March, the team behind the mission pinpointed the cause behind Voyager 1's nonsensical data : a single chip responsible for storing part of the affected portion of the spacecraft’s flight data system (FDS) memory.

FDS collects data from Voyager’s science instruments, as well as engineering data about the health of the spacecraft, and combines them into a single package that’s transmitted to Earth in binary code. When it started glitching, however, the mission began sending data in a repeating pattern of ones and zeroes.

To help resolve the issue, the engineers at NASA’s Jet Propulsion Laboratory placed the affected code elsewhere in the FDS memory rather than fixing the corrupted chip itself.

On May 19, the mission team carried out the second part of Voyager’s rescue mission by beaming a command to the spacecraft. Two of the four science instruments on board Voyager 1 returned to their normal operating modes immediately while two other instruments required some additional work, according to NASA. Now, the space agency happily revealed that all four instruments are returning usable science data.

Voyager 1 launched less than a month after its twin probe, Voyager 2, began its own journey to space. On August 25, 2012, Voyager 1 became the first human-made object to reach interstellar space and travel beyond the Sun’s realm of influence. The spacecraft is currently 15.14 billion miles away, which makes its repair operations all that much more impressive.

For more spaceflight in your life, follow us on X and bookmark Gizmodo’s dedicated Spaceflight page .

First to visit all four giant planets

Voyager 2 is the only spacecraft to visit Uranus and Neptune. The probe is now in interstellar space, the region outside the heliopause, or the bubble of energetic particles and magnetic fields from the Sun.

Mission Type

What is Voyager 2?

NASA's Voyager 2 is the second spacecraft to enter interstellar space. On Dec. 10, 2018, the spacecraft joined its twin – Voyager 1 – as the only human-made objects to enter the space between the stars.

• Voyager 2 is the only spacecraft to study all four of the solar system's giant planets at close range.
• Voyager 2 discovered a 14th moon at Jupiter.
• Voyager 2 was the first human-made object to fly past Uranus.
• At Uranus, Voyager 2 discovered 10 new moons and two new rings.
• Voyager 2 was the first human-made object to fly by Neptune.
• At Neptune, Voyager 2 discovered five moons, four rings, and a "Great Dark Spot."

In Depth: Voyager 2

The two-spacecraft Voyager missions were designed to replace original plans for a “Grand Tour” of the planets that would have used four highly complex spacecraft to explore the five outer planets during the late 1970s.

NASA canceled the plan in January 1972 largely due to anticipated costs (projected at $1 billion) and instead proposed to launch only two spacecraft in 1977 to Jupiter and Saturn. The two spacecraft were designed to explore the two gas giants in more detail than the two Pioneers (Pioneers 10 and 11) that preceded them.

In 1974, mission planners proposed a mission in which, if the first Voyager was successful, the second one could be redirected to Uranus and then Neptune using gravity assist maneuvers.

Each of the two spacecraft was equipped with a slow-scan color TV camera to take images of the planets and their moons and each also carried an extensive suite of instruments to record magnetic, atmospheric, lunar, and other data about the planetary systems.

The design of the two spacecraft was based on the older Mariners, and they were known as Mariner 11 and Mariner 12 until March 7, 1977, when NASA Administrator James C. Fletcher (1919-1991) announced that they would be renamed Voyager.

Power was provided by three plutonium oxide radioisotope thermoelectric generators (RTGs) mounted at the end of a boom.

Voyager 2 at Jupiter

Voyager 2 began transmitting images of Jupiter April 24, 1979, for time-lapse movies of atmospheric circulation. Unlike Voyager 1, Voyager 2 made close passes to the Jovian moons on its way into the system, with scientists especially interested in more information from Europa and Io (which necessitated a 10 hour-long “volcano watch”).

During its encounter, it relayed back spectacular photos of the entire Jovian system, including its moons Callisto, Ganymede, Europa (at a range of about 127,830 miles or 205,720 kilometers, much closer than Voyager 1), Io, and Amalthea, all of which had already been surveyed by Voyager 1.

Voyager 2’s closest encounter to Jupiter was at 22:29 UT July 9, 1979, at a range of about 400,785 miles (645,000 kilometers). It transmitted new data on the planet’s clouds, its newly discovered four moons, and ring system, as well as 17,000 new pictures.

When the earlier Pioneers flew by Jupiter, they detected few atmospheric changes from one encounter to the second, but Voyager 2 detected many significant changes, including a drift in the Great Red Spot as well as changes in its shape and color.

With the combined cameras of the two Voyagers, at least 80% of the surfaces of Ganymede and Callisto were mapped out to a resolution of about 3 miles (5 kilometers).

Voyager 2 at Saturn

Following a course correction two hours after its closest approach to Jupiter, Voyager 2 sped to Saturn – its trajectory determined to a large degree by a decision made in January 1981, to try to send the spacecraft to Uranus and Neptune later in the decade.

Its encounter with the sixth planet began Aug. 22, 1981, two years after leaving the Jovian system, with imaging of the moon Iapetus. Once again, Voyager 2 repeated the photographic mission of its predecessor, although it actually flew about 14,290 miles (23,000 kilometers) closer to Saturn. The closest encounter to Saturn was at 01:21 UT Aug. 26, 1981, at a range of about 63,000 miles (101,000 kilometers).

The spacecraft provided more detailed images of the ring “spokes” and kinks, and also the F-ring and its shepherding moons, all found by Voyager 1. Voyager 2’s data suggested that Saturn’s A-ring was perhaps only about 980 feet (300 meters) thick.

As it flew behind and up past Saturn, the probe passed through the plane of Saturn’s rings at a speed of 8 miles per second (13 kilometers per second). For several minutes during this phase, the spacecraft was hit by thousands of micron-sized dust grains that created “puff” plasma as they were vaporized. Because the vehicle’s attitude was repeatedly shifted by the particles, attitude control jets automatically fired many times to stabilize the vehicle.

During the encounter, Voyager 2 also photographed the Saturn moons Hyperion (the “hamburger moon”), Enceladus, Tethys, and Phoebe, as well as the more recently discovered Helene, Telesto and Calypso.

Voyager 2 at Uranus

Although Voyager 2 had fulfilled its primary mission goals with the two planetary encounters, mission planners directed the veteran spacecraft to Uranus—a journey that would take about 4.5 years.

In fact, its encounter with Jupiter was optimized in part to ensure that future planetary flybys would be possible.

The Uranus encounter’s geometry was also defined by the possibility of a future encounter with Neptune: Voyager 2 had only 5.5 hours of close study during its flyby.

The first human-made object to fly past Uranus, Voyager 2's long-range observations of the planet began Nov. 4, 1985, when signals took approximately 2.5 hours to reach Earth. Light conditions were 400 times less than terrestrial conditions. Closest approach to Uranus took place at 17:59 UT Jan. 24, 1986, at a range of about 50,640 miles (81,500 kilometers).

During its flyby, Voyager 2 discovered 10 new moons (given such names as Puck, Portia, Juliet, Cressida, Rosalind, Belinda, Desdemona, Cordelia, Ophelia, and Bianca – obvious allusions to Shakespeare, continuing a naming tradition begun in 1787), two new rings in addition to the “older” nine rings, and a magnetic field tilted at 55 degrees off-axis and off-center.

The spacecraft found wind speeds in Uranus’ atmosphere as high as 450 miles per hour (724 kilometers per hour) and found evidence of a boiling ocean of water some 497 miles (800 kilometers) below the top cloud surface. Its rings were found to be extremely variable in thickness and opacity.

Voyager 2 also returned spectacular photos of Miranda, Oberon, Ariel, Umbriel, and Titania, five of Uranus’ larger moons. In flying by Miranda at a range of only 17,560 miles (28,260 kilometers), the spacecraft came closest to any object so far in its nearly decade-long travels. Images of the moon showed a strange object whose surface was a mishmash of peculiar features that seemed to have no rhyme or reason. Uranus itself appeared generally featureless.

The spectacular news of the Uranus encounter was interrupted the same week by the tragic Challenger accident that killed seven astronauts during their space shuttle launch Jan. 28, 1986.

Voyager 2 at Neptune

Following the Uranus encounter, the spacecraft performed a single midcourse correction Feb. 14, 1986 – the largest ever made by Voyager 2 – to set it on a precise course to Neptune.

Voyager 2’s encounter with Neptune capped a 4.3 billion-mile (7 billion-kilometer) journey when, on Aug. 25, 1989, at 03:56 UT, it flew about 2,980 miles (4,800 kilometers) over the cloud tops of the giant planet, the closest of its four flybys. It was the first human-made object to fly by the planet. Its 10 instruments were still in working order at the time.

During the encounter, the spacecraft discovered six new moons (Proteus, Larissa, Despina, Galatea, Thalassa, and Naiad) and four new rings.

The planet itself was found to be more active than previously believed, with 680-mile (1,100-kilometer) per hour winds. Hydrogen was found to be the most common atmospheric element, although the abundant methane gave the planet its blue appearance.

Images revealed details of the three major features in the planetary clouds – the Lesser Dark Spot, the Great Dark Spot, and Scooter.

Voyager photographed two-thirds of Neptune’s largest moon Triton, revealing the coldest known planetary body in the solar system and a nitrogen ice “volcano” on its surface. Spectacular images of its southern hemisphere showed a strange, pitted, cantaloupe-type terrain.

The flyby of Neptune concluded Voyager 2’s planetary encounters, which spanned an amazing 12 years in deep space, virtually accomplishing the originally planned “Grand Tour” of the solar system – at least in terms of targets reached, if not in science accomplished.

Voyager 2's Interstellar Mission

Once past the Neptune system, Voyager 2 followed a course below the ecliptic plane and out of the solar system. Approximately 35 million miles (56 million kilometers) past the encounter, Voyager 2’s instruments were put in low-power mode to conserve energy.

After the Neptune encounter, NASA formally renamed the entire project the Voyager Interstellar Mission (VIM).

Of the four spacecraft sent out to beyond the environs of the solar system in the 1970s, three of them – Voyagers 1 and 2 and Pioneer 11 – were all heading in the direction of the solar apex, i.e., the apparent direction of the Sun’s travel in the Milky Way galaxy, and thus would be expected to reach the heliopause earlier than Pioneer 10, which was headed in the direction of the heliospheric tail.

In November 1998, 21 years after launch, nonessential instruments were permanently turned off, leaving seven instruments still operating.

At 9.6 miles per second (15.4 kilometers per second) relative to the Sun, it will take about 19,390 years for Voyager 2 to traverse a single light year.

Asif Siddiqi

Beyond Earth: A Chronicle of Deep Space Exploration

Through the turn of the century, NASA's Jet Propulsion Laboratory (JPL) continued to receive ultraviolet and particle fields data. For example, on Jan. 12, 2001, an immense shock wave that had blasted out of the outer heliosphere on July 14, 2000, finally reached Voyager 2. During its six-month journey, the shock wave had plowed through the solar wind, sweeping up and accelerating charged particles. The spacecraft provided important information on high-energy shock-energized ions.

On Aug. 30, 2007, Voyager 2 passed the termination shock and then entered the heliosheath. By Nov. 5, 2017, the spacecraft was 116.167 AU (about 10.8 billion miles or about 17.378 billion kilometers) from Earth, moving at a velocity of 9.6 miles per second (15.4 kilometers per second) relative to the Sun, heading in the direction of the constellation Telescopium. At this velocity, it would take about 19,390 years to traverse a single light-year.

On July 8, 2019, Voyager 2 successfully fired up its trajectory correction maneuver thrusters and will be using them to control the pointing of the spacecraft for the foreseeable future. Voyager 2 last used those thrusters during its encounter with Neptune in 1989.

The spacecraft's aging attitude control thrusters have been experiencing degradation that required them to fire an increasing and untenable number of pulses to keep the spacecraft's antenna pointed at Earth. Voyager 1 had switched to its trajectory correction maneuver thrusters for the same reason in January 2018.

To ensure that both vintage robots continue to return the best scientific data possible from the frontiers of space, mission engineers are implementing a new plan to manage them. The plan involves making difficult choices, particularly about instruments and thrusters.

National Space Science Data Center: Voyager 2

A library of technical details and historic perspective.

A comprehensive history of missions sent to explore beyond Earth.

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NASA's Voyager 1, the Most Distant Spacecraft From Earth, Is Doing Science Again After Problem

NASA's Voyager 1 spacecraft is sending science data again

NASA's Voyager 1, the Most Distant Spacecraft From Earth, Is Doing Science Again After Problem

FILE - This illustration provided by NASA depicts Voyager 1. The most distant spacecraft from Earth stopped sending back understandable data in November 2023. The Jet Propulsion Laboratory in Southern California announced this week that Voyager 1's four scientific instruments are back in business after a technical snafu in November. (NASA via AP, File)

DALLAS (AP) — NASA's Voyager 1, the most distant spacecraft from Earth, is sending science data again.

Voyager 1's four instruments are back in business after a computer problem in November, the Jet Propulsion Laboratory said this week. The team first received meaningful information again from Voyager 1 in April, and recently commanded it to start studying its environment again.

Launched in 1977, Voyager 1 is drifting through interstellar space, or the space between star systems. Before reaching this region, the spacecraft discovered a thin ring around Jupiter and several of Saturn’s moons. Its instruments are designed to collect information about plasma waves, magnetic fields and particles.

Voyager 1 is over 15 billion miles (24.14 kilometers) from Earth. Its twin Voyager 2 — also in interstellar space — is more than 12 billion miles (19.31 kilometers) miles away.

The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Science and Educational Media Group. The AP is solely responsible for all content.

Copyright 2024 The  Associated Press . All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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• Where Are They Now
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• Q & A with Ed Stone

golden record

Where are they now.

• frequently asked questions
• Q&A with Ed Stone

Interstellar Science

Science Investigations

• Magnetic field investigation (MAG)
• Low energy charged particle investigation (LECP)
• Plasma investigation (PLS)
• Cosmic ray investigation (CRS)
• Plasma wave investigation (PWS)

There are currently five science investigation teams participating in the VIM. The science teams for these investigations are currently collecting and evaluating data on the strength and orientation of the Sun's magnetic field; the composition, direction and energy spectra of the solar wind particles and interstellar cosmic rays; the strength of radio emissions that are thought to be originating at the heliopause, beyond which is interstellar space; and the distribution of hydrogen within the outer heliosphere.

There are 4 operating instruments on-board the Voyager 1 spacecraft. These instruments directly support the five science investigations teams. The Planetary Radio Astronomy Investigation (PRA) is no longer working on the Voyager 1 spacecraft and the Ultraviolet Spectrometer Subsystem (UVS) is no longer working on Voyager 1 or Voyager 2.

Science Data Acquisition Strategy

Science data are returned to earth in real time at 160 bps. Real time data capture uses 34 meter Deep Space Network (DSN) resources with the project goal to acquire at least 16 hours per day of real time data per spacecraft. This goal is not always achieved due to the competition for DSN resources with prime mission projects and other extended mission projects.

Three times per week, Voyager 1 has 48 seconds of high rate (2.8 kbps) PWS data recorded onto the Digital Tape Recorder (DTR) for later playback. Voyager 1 has six playbacks per year. The playbacks require 70 meter and 34 meter DSN support for data capture. After transmission of the data (either real time or recorded) to JPL, it is processed and made available in electronic files to the science teams located around the country for their processing and analysis.

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