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NASA's Juno Spacecraft Breaks Solar Power Distance Record
NASA's Juno mission to Jupiter has broken the record to become humanity's most distant solar-powered emissary. The milestone occurred at 11 a.m. PST (2 p.m. EST, 19:00 UTC) on Wednesday, Jan. 13, when Juno was about 493 million miles (793 million kilometers) from the sun.
The previous record-holder was the European Space Agency's Rosetta spacecraft, whose orbit peaked out at the 492-million-mile (792-million-kilometer) mark in October 2012, during its approach to comet 67P/Churyumov-Gerasimenko.
"Juno is all about pushing the edge of technology to help us learn about our origins," said Scott Bolton, Juno principal investigator at the Southwest Research Institute in San Antonio. "We use every known technique to see through Jupiter's clouds and reveal the secrets Jupiter holds of our solar system’s early history. It just seems right that the sun is helping us learn about the origin of Jupiter and the other planets that orbit it."
The Juno spacecraft will arrive at Jupiter in 2016 to study
the giant planet from an elliptical, polar orbit. Juno will repeatedly dive
between the planet and its intense belts of charged particle radiation, coming
only 5,000 kilometers (about 3,000 miles) from the cloud tops at closest
approach.
Image
credit: NASA/JPL-Caltech
Launched
in 2011, Juno is the first solar-powered spacecraft designed to operate at such
a great distance from the sun. That's why the surface area of solar panels
required to generate adequate power is quite large. The four-ton Juno spacecraft
carries three 30-foot-long (9-meter) solar arrays festooned with 18,698 individual
solar cells. At Earth distance from the sun, the cells have the potential to
generate approximately 14 kilowatts of electricity. But transport those same rectangles
of silicon and gallium arsenide to a fifth rock from the sun distance, and it’s
a powerfully different story.
"Jupiter
is five times farther from the sun than Earth, and the sunlight that reaches
that far out packs 25 times less punch," said Rick Nybakken, Juno's
project manager from NASA's Jet Propulsion Laboratory in Pasadena, Calif.
"While our massive solar arrays will be generating only 500 watts when we
are at Jupiter, Juno is very efficiently designed, and it will be more than
enough to get the job done."
Prior
to Juno, eight spacecraft have navigated the cold, harsh underlit realities of
deep space as far out as Jupiter. All have used nuclear power sources to get
their job done. Solar power is possible on Juno due to improved solar-cell
performance, energy-efficient instruments and spacecraft, a mission design that
can avoid Jupiter’s shadow, and a polar orbit that minimizes the total
radiation. Juno’s maximum distance from the sun during its 16-month science
mission will be about 517 million miles (832 million kilometers), an almost
five percent increase in the record for solar-powered space vehicles.
"It is cool we got
the record and that our dedicated team of engineers and scientists can chalk up
another first in space exploration," said Bolton. "But the best is
yet to come. We are achieving these records and venturing so far out for a
reason -- to better understand the biggest world in our solar system and
thereby better understand where we came from."
Juno
will arrive at Jupiter on July 4 of this year. Over the next year the
spacecraft will orbit the Jovian world 33 times, skimming to within 3,100 miles
(5,000 kilometers) above the planet’s cloud tops every 14 days. During the flybys, Juno will probe beneath the obscuring cloud cover of Jupiter and
study Jupiter’s aurorae to learn more about the planet's origins, structure,
atmosphere and magnetosphere.
NASA's Jet Propulsion Laboratory, Pasadena, California, manages
the Juno mission for the principal investigator, Scott Bolton, of Southwest
Research Institute in San Antonio. Juno is part of NASA's New Frontiers
Program, which is managed at NASA's Marshall Space Flight Center in Huntsville,
Alabama. Lockheed Martin Space Systems, Denver, built the spacecraft. The California
Institute of Technology in Pasadena manages JPL for NASA.
This graphic shows how NASA’s Juno mission to Jupiter became the most distant solar-powered explorer and influenced the future of space exploration powered by the sun.