NASA’s Juno spacecraft is halfway to Jupiter. The Jovian-system-bound spacecraft reached the milestone today (8/12/13) at 5:25 a.m. PDT (8:25 a.m. EDT/12:25 UTC).
“Juno’s odometer just clicked over to 9.464 astronomical units,” said Juno Principal Investigator Scott Bolton, of the Southwest Research Institute in San Antonio. “The team is looking forward, preparing for the day we enter orbit around the most massive planet in our solar system.”
For those astronomical-unitly challenged, an astronomical unit (AU) is a unit of measure used by space engineers and scientists when discussing the massive distances involved in the exploration of our solar system – and beyond. An AU is based on the distance between Earth and the sun and is 92,955,807.273 miles (149,597,870.7 kilometers) long. The 9.464 astronomical units Juno has already traveled (or still has left to go) is equivalent to 879,733,760 miles (or 1,415,794,248 kilometers). Juno was 34.46 million miles (55.46 million kilometers) from Earth when the milestone was reached. The next milestone in the nearly five-year journey to Jupiter will occur this October, when the spacecraft flies past Earth in search of a little extra speed.
“On Oct. 9, Juno will come within 347 miles (559 kilometers) of Earth,” said the mission’s Project Manager Rick Nybakken of NASA’s Jet Propulsion Laboratory in Pasadena, Calif. “The Earth flyby will give Juno a kick in the pants, boosting its velocity by 16,330 mph (about 7.3 kilometers per second). From there, it’s next stop Jupiter.”
Juno will arrive at Jupiter on July 4, 2016, at 7:29 p.m. PDT (10:29 p.m. EDT).
A computer-generated image depicts NASA’s Juno spacecraft on its way to Jupiter. Image credit: NASA/JPL-Caltech.