NASA Grants 3 Year Extension to Jupiter Orbiting Juno Mission

This extraordinary view of Jupiter was captured
by NASA’s Juno spacecraft on the outbound leg of its 12th close
flyby of the gas giant planet was created from images on April1, 2018 by the Junocam
camera.   This new perspective of Jupiter
from the south makes the Great Red Spot appear as though it is in northern
territory. Credits: NASA/JPL-Caltech/SwRI/MSSS/Gerald Eichstäd/Seán Doran
Ken Kremer     9 June 2018

FL –  NASA officials have granted a three
year extension to the Juno mission currently orbiting Jupiter until 2021.

NASA’s approval of the extension of the probes primary mission phase
funds science and engineering operations through July 2021.
The extra 41 months of science observations will enable Juno
to achieve its primary mission goals. 
its continued mission, NASA’s Juno spacecraft will maintain its 53-day polar
orbit around Jupiter,” NASA officials said.
Under its original plan, Juno was to gather observations during
much shorter 14-day long orbits. However concerns with valves related to its
main engine forced the team  to abandon
plans to fire the main engine to lower and shorten the orbit.

Instead the team decided to leave Juno in a 53-day orbit
where it could continue to make all its planned research observation – but just
over a longer period of time. 
During its continued
mission, NASA’s Juno spacecraft will maintain its 53-day polar orbit around
At its closest, Juno
passes within 3,000 miles (5,000 kilometers) of Jupiter’s cloud tops once
during each 53-day orbit. At the high end of each orbit, Juno is about 5
million miles (8-million kilometers) from the planet – which is just beyond the
orbit of the Jovian moon Themisto.  Credit:

To date Juno has completed 12 orbits since arriving at Jupiter
in July 2016. 
“Juno is in 53-day orbits rather than 14-day
orbits as initially planned because of a concern about valves on the
spacecraft’s fuel system. This longer orbit means that it will take more time
to collect the needed science data.”

The extension was granted after “an independent
panel of experts confirmed in April that Juno is on track to achieve its
science objectives and is already returning spectacular results.  The Juno
spacecraft and all instruments are healthy and operating nominally,” NASA noted. 

The prime mission had been scheduled
to end in February of 2018 with a suicide plunge into the Jovian atmosphere to
prevent any possible contamination with Jupiter’s potentially habitable moons
such as Europa and Ganymede.

“With these funds, not only can the Juno team
continue to answer long-standing questions about Jupiter that first fueled this
exciting mission, but they’ll also investigate new scientific puzzles motivated
by their discoveries thus far,” said Thomas Zurbuchen, associate administrator
for NASA’s Science Mission Directorate in Washington, in a statement.

“With every additional orbit, both scientists
and citizen scientists will help unveil new surprises about this distant

Juno is equipped with a suite of nine state-of-the-art
science instruments to gather totally unique observations of Jupiter’s interior
and exterior environment and determine the gas giants genesis.   


The solar powered probe will collect unparalleled
new data that will unveil the hidden inner secrets of Jupiter’s origin and
evolution as it peers “beneath the obscuring cloud cover of Jupiter and study
its auroras to learn more about the planet’s origins, structure, atmosphere and

Artists concept of NASA’s Juno at Jupiter. Credit: NASA

“This is great news for planetary exploration as
well as for the Juno team,” said Scott Bolton, principal investigator of Juno,
from the Southwest Research Institute in San Antonio, in a statement. 

“These updated plans for Juno will allow it
to complete its primary science goals. As a bonus, the larger orbits allow us
to further explore the far reaches of the Jovian magnetosphere — the region of
space dominated by Jupiter’s magnetic field — including the far magnetotail,
the southern magnetosphere, and the magnetospheric boundary region called the
magnetopause. We have also found Jupiter’s radiation environment in this orbit
to be less extreme than expected, which has been beneficial to not only our
spacecraft, but our instrumunts and the continued quality of science data

“There is no impact on the primary science goals by staying
in the longer 53-day orbit,” Bolton told me in an earlier interview with Space

Juno’s next close flyby over Jupiter’s
mysterious cloud tops takes place on July 16 during orbit 13.

The $1.1 Billion Juno
was launched on Aug. 5, 2011 from Cape Canaveral Air Force Station, Florida atop
the most powerful version of the Atlas V rocket augmented by 5 solid rocket
boosters and built by United Launch Alliance (ULA).

The Juno spacecraft was built by
prime contractor Lockheed Martin in Denver.

The last NASA spacecraft to orbit
Jupiter was Galileo in 1995. It explored the Jovian system until 2003.

Watch for Ken’s continuing onsite coverage of NASA, SpaceX, ULA,
Boeing, Lockheed Martin, Orbital ATK and more space and mission reports direct
from the Kennedy Space Center, Cape Canaveral Air Force Station, Florida and
Wallops Flight Facility, Virginia.

Stay tuned here for Ken’s continuing Earth and Planetary science and human
spaceflight news:
– – twitter @ken_kremer – email: ken at

Ken Kremer

Watch for Ken’s continuing onsite coverage of NASA, SpaceX, ULA, Boeing, Lockheed Martin, Northrop Grumman and more space and mission reports direct from Kennedy Space Center and Cape Canaveral Air Force Station in Florida and Wallops Flight Facility in Virginia. Stay tuned here for Ken's continuing Earth and Planetary science and human spaceflight news. Dr. Kremer is a research scientist and journalist based in the KSC area, active in outreach and interviewed regularly on TV and radio about space topics. Ken’s photos are for sale and he is available for lectures and outreach events.

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