April 15, 2021: NASA’s New Horizons Reaches a Rare Space Milestone - at April 17 at 8:42 p.m. EDT it will be 50 AU from Earth

Now 50 times as far from the Sun as Earth, History-Making Pluto Explorer, New Horizons, Photographs Voyager 1’s Location from the Kuiper Belt.

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Currently exploring the Kuiper Belt, New Horizons is just one of five spacecraft to reach 50 astronomical units, on its way out of the solar system and, eventually, into interstellar space. (Credit: NASA/Johns Hopkins APL/Southwest Research Institute)

In the weeks following its launch in early 2006, when NASA’s New Horizons was still close to home, it took just minutes to transmit a command to the spacecraft, and hear back that the onboard computer received and was ready to carry out the instructions.

As New Horizons crossed the solar system, and its distance from Earth jumped from millions to billions of miles, that time between contacts grew from a few minutes to several hours. And on April 18 at 12:42 UTC (or April 17 at 8:42 p.m. EDT), New Horizons will reach a rare deep-space milepost -- 50 astronomical units from the Sun, or 50 times farther from the Sun than Earth is.

Here’s one way to imagine just how far 50 AU is: Think of the solar system laid out on a neighborhood street; the Sun is one house to the left of “home” (or Earth), Mars would be the next house to the right, and Jupiter would be just four houses to the right. New Horizons would be 50 houses down the street, 17 houses beyond Pluto!

New Horizons is just the fifth spacecraft to reach this great distance, following the legendary Voyagers 1 and 2 and their predecessors, Pioneers 10 and 11. It’s almost 5 billion miles (7.5 billion kilometers) away; a remote region where one of those radioed commands, even traveling at the speed of light, needs seven hours to reach the far flung spacecraft. Then add seven more hours before its control team on Earth finds out if the message was received.

“It’s hard to imagine something so far away,” said Alice Bowman, the New Horizons mission operations manager at the Johns Hopkins Applied Physics Laboratory in Laurel, Maryland. “One thing that makes this distance tangible is how long it takes for us on Earth to confirm that the spacecraft received our instructions. This went from almost instantaneous to now being on the order of 14 hours. It makes the extreme distance real.”

To mark the occasion, New Horizons recently photographed the star field where one of its long-distance cousins, Voyager 1, appears from New Horizons’ unique perch in the Kuiper Belt. Never before has a spacecraft in the Kuiper Belt photographed the location of an even more distant spacecraft, now in interstellar space. Although Voyager 1 is far too faint to be seen directly in the image, its location is known precisely due to NASA’s radio tracking.

Hello, Voyager! From the distant Kuiper Belt at the solar system’s frontier, on Christmas Day, Dec. 25, 2020, NASA’s New Horizons spacecraft pointed its Long Range Reconnaissance Imager in the direction of the Voyager 1 spacecraft, whose location is marked with the yellow circle. Voyager 1, the farthest human-made object and first spacecraft to actually leave the solar system, is more than 152 astronomical units (AU) from the Sun – about 14.1 billion miles or 22.9 billion kilometers -- and was 11.2 billion miles (18 billion kilometers) from New Horizons when this image was taken. Voyager 1 itself is about 1 trillion times too faint to be visible in this image. Most of the objects in the image are stars, but several of them, with a fuzzy appearance, are distant galaxies. New Horizons reaches the 50 AU mark on April 18, 2021, and will join Voyagers 1 and 2 in interstellar space in the 2040s. (Image credit: NASA/Johns Hopkins APL/Southwest Research Institute)

“That’s a hauntingly beautiful image to me,” said Alan Stern, New Horizons principal investigator from the Southwest Research Institute in Boulder, Colorado.

“Looking back at the flight of New Horizons from Earth to 50 AU almost seems in some way like a dream,” he continued. “Flying a spacecraft across our entire solar system to explore Pluto and the Kuiper Belt had never been done before New Horizons. Most of us on the team have been a part of this mission since it was just an idea, and during that time our kids have grown up, and our parents, and we ourselves, have grown older. But most importantly, we made many scientific discoveries, inspired countless STEM careers, and even made a little history.”

New Horizons was practically designed to make history. Dispatched at 36,400 miles per hour (58,500 kilometers per hour) on Jan. 19, 2006, New Horizons was and is still the fastest human-made object ever launched from Earth. Its gravity-assist flyby of Jupiter in February 2007 not only shaved about three years from its voyage to Pluto, but allowed it to make the best views ever of Jupiter’s faint ring, and capture the first movie of a volcano erupting anywhere in the solar system except Earth.

New Horizons successfully pulled off the first exploration of the Pluto system in July 2015, followed by the farthest flyby in history – and first close-up look at a Kuiper Belt object (KBO) -- with its flight past Arrokoth on New Year’s day 2019. From its unique perch in the Kuiper Belt, New Horizons is making observations that can’t be made from anywhere else even the stars look different from the spacecraft’s point of view.

New Horizons team members use giant telescopes like the Japanese Subaru observatory to scan the skies for another potential (and long-shot) KBO flyby target, New Horizons itself remains healthy, collecting data on the solar wind and space environment in the Kuiper Belt, other Kuiper Belt objects, and distant planets like Uranus and Neptune. This summer, the mission team will transmit a software upgrade to boost New Horizons’ scientific capabilities. For future exploration, the spacecraft’s nuclear battery should provide enough power to keep New Horizons operating until the late-2030s.

© 2021 The Johns Hopkins University Applied Physics Laboratory LLC. All rights reserved.
11100 Johns Hopkins Road, Laurel, Maryland 20723

See: http://pluto.jhuapl.edu/News-Center/News-Article.php?page=20210415

I thoroughly enjoy knowing that another of man's spacecrafts, New Horizons, will pass such an auspicious milestone on this coming Sunday. And it blows my mind to think that, at the speed of light, it takes seven hours for radio signals to travel from New Horizons to Earth. Imagine being in a manned space craft at that distance and having an emergency requiring JPL's or Johns Hopkins' intervention. In any case, it will take a special kind of pioneer who'll rely on advanced AI and even perhaps cyborgs for help on the journey out of the solar system into the Sagittarius Arm of the Milky Way.
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Why O Why did it take so long? Modern science says it's the mass-velocity problem. In which I can not follow. I can understand the concept for getting into orbit. But once in orbit, and out of earth's bond, why can't we travel mush faster. If we are limited to these speeds, exploring this solar system will take hundreds of years. And real exploration is only a dream. Why can't fuel be sent ahead and parked with the proper velocities for to re-fuel? Like sending a saturn five's worth of fuel and parking it in neptune's orbit.

Once in earth's orbit, surely the thrust required to go to neptune quickly, wouldn't be as much thrust as to break orbit. What speeds would the saturn five reach, if launch from orbit?

In other words.....a saturn five launched from orbit, is it under the same restrictions as one launched from ground???? Can someone explain this? Gravity has no effect on acceleration? When the gravity is gone, just the acceleration is enough for the mass-fuel problem? Very un-clear. And please don't tell me that no one will try.......because of the math.

If the mass-fuel problem can not be nullified, then our only option is to collect mass as we go. The solar wind is under acceleration clear out pass neptune. We would have to collect it, and turn it for propulsion.

Charge tacking.