Tag Archives: Jupiter

Edward Stone: 50 Years at NASA ends, but his brainchild Voyager’s Project goes on

Posted on by
Reply

Stone’s remarkable tenure on NASA’s longest-operating mission spans decades of historic discoveries and firsts.

Edward Stone has retired as the project scientist for NASA’s Voyager mission a half-century after taking on the role. Stone accepted scientific leadership of the historic mission in 1972, five years before the launch of its two spacecraft, Voyager 1 and Voyager 2. Under his guidance, the Voyagers explored the four giant planets and became the first human-made objects to reach interstellar space, the region between the stars containing material generated by the death of nearby stars.

Until now, Stone was the only person to have served as project scientist for Voyager, maintaining his position even while serving as director of NASA’s Jet Propulsion Laboratory in Southern California from 1991 to 2001. JPL manages the Voyager mission for NASA. Stone retired from JPL in 2001 but continued to serve as the mission’s project scientist.

“It has been an honor and a joy to serve as the Voyager project scientist for 50 years,” Stone said. “The spacecraft have succeeded beyond expectation, and I have cherished the opportunity to work with so many talented and dedicated people on this mission. It has been a remarkable journey, and I’m thankful to everyone around the world who has followed Voyager and joined us on this adventure.”

Edward Stone

Edward Stone, second from left, and other members of the Voyager team pose with a model of the spacecraft in 1977, the year the twin probes launched. Credit: NASA/JPL-Caltech

Linda Spilker will succeed Stone as Voyager’s project scientist as the twin probes continue to explore interstellar space. Spilker was a member of the Voyager science team during the mission’s flybys of Jupiter, Saturn, Uranus, and Neptune. She later became project scientist for NASA’s now-retired Cassini mission to Saturn, and rejoined Voyager as deputy project scientist in 2021.

Jamie Rankin, a research scientist at Princeton University and a member of the Voyager science steering group, has been appointed deputy project scientist for the mission. Rankin received her Ph.D. in 2018 from Caltech, where Stone served as her advisor. Her research combines data from Voyager and other missions in NASA’s heliophysics fleet.

The twin Voyager spacecraft launched in 1977, on a mission to explore Jupiter and Saturn, ultimately revealing never-before-seen features of those planets and their moons. Voyager 1 continued its journey out of the solar system, while Voyager 2 continued on to Uranus and Neptune – and remains the only spacecraft to have visited the ice giants.

Edward Stone

Edward Stone, left, talks to reporters at a news conference to announce findings from Voyager 2’s flyby of Uranus in 1986. Credit: NASA/JPL-Caltech

Following this “grand tour” of the outer planets, the Voyager Interstellar Mission began. The goal was to exit the heliosphere – a protective bubble created by the Sun’s magnetic field and outward flow of solar wind (charged particles from the Sun). Voyager 1 crossed the boundary of the heliosphere and entered interstellar space in 2012, followed by Voyager 2 (traveling slower and in a different direction) in 2018. Today, as part of NASA’s longest-running mission, both spacecraft continue to illuminate the interplay between our Sun, and the particles and magnetic fields in interstellar space.

“Ed likes to say that Voyager is a mission of discovery, and it certainly is,” said Suzanne Dodd, Voyager project manager. “From the flybys of the outer planets in the 1970s and ’80s, to the heliopause crossing and current travels through interstellar space, Voyager never ceases to surprise and amaze us. All those milestones and successes are due to Ed’s exceptional scientific leadership and his keen ability to share his excitement about these discoveries to the world.”

Among the many honors bestowed on him, Stone has been a member of the National Academy of Sciences since 1984. He was awarded the National Medal of Science from President George H.W. Bush in 1991. When Stone was interviewed on the late-night TV show “The Colbert Report” in 2013, NASA arranged for host Stephen Colbert to present him with the NASA Distinguished Public Service Medal, the agency’s highest honor for a nongovernment individual. In 2019, he received the Shaw Prize in Astronomy from the Shaw Foundation in Hong Kong for his work on the Voyager mission.

Also Read:

NASA’s Hubble finds spiraling stars ‘NGC 346’, providing window into early universe

US Postal Service Celebrates NASA’s Webb Telescope With New Postal Stamp

Cassini Takes Plunge Into Saturn, Scientists Cross-Fingered

Space News: Planetary-scale ‘heat wave’ discovered in Jupiter’s atmosphere

Posted on by
Reply

An unexpected ‘heat wave’ of 700 degrees Celsius, extending 130,000 kilometres (10 Earth diameters) in Jupiter’s atmosphere, has been discovered. James O’Donoghue, of the Japanese Aerospace Exploration Agency (JAXA), has presented the results this week at the Europlanet Science Congress (EPSC) 2022 in Granada.

Jupiter’s atmosphere, famous for its characteristic multicoloured vortices, is also unexpectedly hot: in fact, it is hundreds of degrees hotter than models predict. Due to its orbital distance millions of kilometres from the Sun, the giant planet receives under 4% of the amount of sunlight compared to Earth, and its upper atmosphere should theoretically be a frigid -70 degrees Celsius. Instead, its cloud tops are measured everywhere at over 400 degrees Celsius.

“Last year we produced – and presented at EPSC2021 – the first maps of Jupiter’s upper atmosphere capable of identifying the dominant heat sources,” said Dr O’Donoghue. “Thanks to these maps, we demonstrated that Jupiter’s auroras were a possible mechanism that could explain these temperatures.”

Just like the Earth, Jupiter experiences auroras around its poles as an effect of the solar wind. However, while Earth’s auroras are transient and only occur when solar activity is intense, auroras at Jupiter are permanent and have a variable intensity. The powerful auroras can heat the region around the poles to over 700 degrees Celsius, and global winds can redistribute the heat globally around Jupiter.

A panning-view of Jupiter’s upper atmospheric temperatures, 1000 kilometers above the cloud tops. Jupiter is shown on top of a visible image for context. In this snapshot, the auroral region (near the northern pole, in yellow/white) appears to have shed a massive, planetary-scale wave of heating towards the equator. The feature is over 130,000 kilometers long, or 10-Earth diameters, and is hundreds of degrees warmer than the background. For video see: https://youtu.be/gWT0QwSoVls/CREDIT:Hubble / NASA / ESA / A. Simon (NASA GSFC) / J. Schmidt. Credit: James O’Donoghue

Looking more deeply through their data, Dr O’Donoghue and his team discovered the spectacular ‘heat wave’ just below the northern aurora, and found that it was travelling towards the equator at a speed of thousands of kilometres per hour.

The heat wave was probably triggered by a pulse of enhanced solar wind plasma impacting Jupiter’s magnetic field, which boosted auroral heating and forced hot gases to expand and spill out towards the equator.

“While the auroras continuously deliver heat to the rest of the planet, these heat wave ‘events’ represent an additional, significant energy source,” added Dr O’Donoghue. “These findings add to our knowledge of Jupiter’s upper-atmospheric weather and climate, and are a great help in trying to solve the ‘energy crisis’ problem that plagues research into the giant planets.”

After 70 years, Jupiter moves closest to Earth on Sept 26

Posted on by
Reply

Jupiter is set to make its closest approach to Earth in the last 70 years and on September 26, stargazers can expect an excellent view when the giant planet reaches opposition.

From the viewpoint of Earth’s surface, opposition happens when an astronomical object rises in the east as the Sun sets in the west, placing the object and the Sun on opposite sides of Earth.

Jupiter’s opposition occurs every 13 months, making the planet appear larger and brighter than any other time of the year. But that’s not all.

“Jupiter’s closest approach to Earth rarely coincides with opposition, which means this year’s views will be extraordinary,” NASA said in a statement late on Friday.

Jupiter/IANS

At its closest approach, Jupiter will be approximately 365 million miles in distance from Earth.

The planet is approximately 600 million miles away from Earth at its farthest point.

“With good binoculars, the banding (at least the central band) and three or four of the Galilean satellites (moons) should be visible,” said Adam Kobelski, a research astrophysicist at NASA’s Marshall Space Flight Center in Huntsville, Alabama.

“It’s important to remember that Galileo observed these moons with 17th century optics. One of the key needs will be a stable mount for whatever system you use,” he noted.

Kobelski recommends a larger telescope to see Jupiter’s Great Red Spot and bands in more detail — a four inch-or-larger telescope and some filters in the green to blue range would enhance the visibility of these features.

According to Kobelski, an ideal viewing location will be at a high elevation in a dark and dry area.

Jupiter has 53 named moons, but scientists believe that 79 have been detected in total.

The four largest moons — Io, Europa, Ganymede and Callisto — are called the Galilean satellites.

NASA‘s Juno spacecraft, which has been orbiting Jupiter for six years, is dedicated to exploring the planet’s surface and its moons.

Scientists believe studying Jupiter can lead to breakthrough discoveries about the formation of the solar system.

Explore the Solar System With NASA’s New, Improved 3D ‘Eyes’

Posted on by
Reply

The agency’s newly upgraded “Eyes on the Solar System” visualization tool includes Artemis I’s trajectory along with a host of other new features.

NASA has revamped its “Eyes on the Solar System” 3D visualization tool, making interplanetary travel easier and more interactive than ever. More than two years in the making, the update delivers better controls, improved navigation, and a host of new opportunities to learn about our incredible corner of the cosmos – no spacesuit required. All you need is a device with an internet connection.

 Trace the course Artemis I will take to lunar orbit, or touch down with Perseverance during its harrowing entry, descent, and landing on the Red Planet. Learn the basics about dwarf planets or the finer points of gas giants, and ride alongside no fewer than 126 space missions past and present. You can even follow the paths of spacecraft and celestial bodies as far back as 1949 and as far into the future as 2049.

While you’re at it, you can rotate objects, compare them side by side, and even modulate the perspective as well as the lighting. The visuals are striking. This latest version of “Eyes” also lets you scroll through rich interactive journeys, including Voyager’s Grand Tour of Jupiter, Saturn, Uranus, and Neptune.

“The beauty of the new browser-based ‘Eyes on the Solar System’ is that it really invites exploration. You just need an internet connection, a device that has a web browser, and some curiosity,” said Jason Craig, the producer of the “Eyes” software at NASA’s Jet Propulsion Laboratory.

NASA’s Juno to Fly Directly Over Jupiter’s Mysterious Red Spot Now

Posted on by
Reply

NASA’s Juno spacecraft is all set for another manoeuvre on July 10, flying directly over Jupiter’s Great Red Spot, the gas giant’s iconic, 10,000-mile-wide (16,000-kilometer-wide) storm.

This meanoeuvre will be humanity’s first close-up view of the gigantic storm being monitored since 1830 and possibly existing for more than 350 years on Jupiter, making it mysterious and puzzling.

“Jupiter’s mysterious Great Red Spot is probably the best-known feature of Jupiter,” said Scott Bolton, principal investigator of Juno from the Southwest Research Institute in San Antonio. “This monumental storm has raged on the solar system’s biggest planet for centuries. Now, Juno and her cloud-penetrating science instruments will dive in to see how deep the roots of this storm go, and help us understand how this giant storm works and what makes it so special,” said a NASA report.

The July 10 flyby will Juno’s sixth on to the gas giant’s mysterious cloud tops. Since Juno’s perijove is on Monday, July 10, at 6:55 pm PDT (9:55 pm EDT), Juno will be about 2,200 miles (3,500 kilometers) above the planet’s cloud tops.

In its closest reach lasting for 11 minutes and 33 seconds, Juno will cover another 24,713 miles (39,771 kilometers) and will be directly above the coiling crimson cloud tops of Jupiter’s Great Red Spot, said NASA. The spacecraft will bee about 5,600 miles (9,000 kilometers) above the Giant Red Spot clouds and all its 8 instruments and its camera JunoCam, will be directly on the storm during the flyby.

“The success of science collection at Jupiter is a testament to the dedication, creativity and technical abilities of the NASA-Juno team,” said Rick Nybakken, project manager for Juno from NASA’s Jet Propulsion Laboratory in Pasadena, California. “Each new orbit brings us closer to the heart of Jupiter’s radiation belt, but so far the spacecraft has weathered the storm of electrons surrounding Jupiter better than we could have ever imagined.”

As US is celebrating its Independence Day on July 4, Juno will have logged exactly one year in Jupiter orbit.