Juno prepares to jump Jupiter’s shadow
Deborah Byrd in SPACE | October 3, 2019
NASA’s Juno mission to Jupiter has now successfully executed a 10.5-hour propulsive maneuver. It’ll keep Juno – a solar-powered spacecraft – out of a mission-ending shadow due to have been cast by Jupiter onto the craft in November.
Deborah Byrd in SPACE | October 3, 2019
NASA’s Juno mission to Jupiter has now successfully executed a 10.5-hour propulsive maneuver. It’ll keep Juno – a solar-powered spacecraft – out of a mission-ending shadow due to have been cast by Jupiter onto the craft in November.
In this animated gif, you’re riding on the Juno spacecraft – now in orbit around Jupiter – as it approaches Jupiter. An orbit adjustment this week has ensured the solar-powered spacecraft won’t end its mission in Jupiter’s shadow on November 3. Here, you can see Jupiter’s rings and auroras. The distant sun is depicted as the yellow dot rising up just to the left of the planet. Image via NASA/JPL-Caltech/SwRI. |
Space engineers at NASA’s Jet Propulsion Laboratory in Pasadena, California, began executing the maneuver on September 30, 2019, at 7:46 p.m. EDT (23:46 UTC) and completed it early on October 1. In all, the maneuver lasted 10.5 hours, an extraordinarily long time by Juno mission standards. NASA said in a statement:
Using the spacecraft’s reaction-control thrusters, the propulsive maneuver lasted five times longer than any previous use of that system. It changed Juno’s orbital velocity by 126 mph (203 kph) and consumed about 160 pounds (73 kilograms) of fuel. Without this maneuver, Juno would have spent 12 hours in transit across Jupiter’s shadow – more than enough time to drain the spacecraft’s batteries. Without power, and with spacecraft temperatures plummeting, Juno would likely succumb to the cold and be unable to awaken upon exit.
Speaking of shadows, here’s the shadow of Jupiter’s moon Io, falling on Jupiter’s cloudtops, as captured by the Juno spacecraft on September 11, 2019. Citizen scientist Kevin M. Gill created this enhanced-color image using data from the spacecraft’s JunoCam imager. Image via Juno Image Gallery. |
With the success of this burn, we are on track to jump the shadow on November 3.
Jumping over the shadow was an amazingly creative solution to what seemed like a fatal geometry. Eclipses are generally not friends of solar-powered spacecraft. Now instead of worrying about freezing to death, I am looking forward to the next science discovery that Jupiter has in store for Juno.
Ed Hirst, Juno project manager at JPL, said:
Pre-launch mission planning did not anticipate a lengthy eclipse that would plunge our solar-powered spacecraft into darkness. That we could plan and execute the necessary maneuver while operating in Jupiter’s orbit is a testament to the ingenuity and skill of our team, along with the extraordinary capability and versatility of our spacecraft.
Thus – despite its initial difficulties and this most recent potential heart-stopper – Juno will survive to continue its mission and its contributions to science.
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