Juno to make closest approach to Jupiter on Saturday

JPL News Release

This Saturday at 12:51 UTC NASA’s Juno spacecraft will get closer to the cloud tops of Jupiter than at any other time during its prime mission. At the moment of closest approach, Juno will be about 4,200 kilometres (2,500 miles) above Jupiter’s swirling clouds and traveling at 208,000 kilometres per hour (130,000 mph) with respect to the planet. There are 35 more close flybys of Jupiter scheduled during its prime mission (scheduled to end in February of 2018). The 27 August flyby will be the first time Juno will have its entire suite of science instruments activated and looking at the giant planet as the spacecraft zooms past.

This dual view of Jupiter was taken on 23 August, when NASA's Juno spacecraft was 4.4 million kilometres (2.8 million miles) from the gas giant planet on the inbound leg of its initial 53.5-day capture orbit. The image on the left is a colour composite taken with Junocam's visible red, green, and blue filters. The image on the right was also taken by JunoCam, but uses the camera's infrared filter, which is sensitive to the abundance of methane in the atmosphere. Bright features like the planet's Great Red Spot are higher in the atmosphere, and so have less of their light absorbed by the methane. Image: NASA/JPL-Caltech/SwRI/MSSS.
This dual view of Jupiter was taken on 23 August, when NASA’s Juno spacecraft was 4.4 million kilometres (2.8 million miles) from the gas giant planet on the inbound leg of its initial 53.5-day capture orbit. The image on the left is a colour composite taken with Junocam’s visible red, green, and blue filters. The image on the right was also taken by JunoCam, but uses the camera’s infrared filter, which is sensitive to the abundance of methane in the atmosphere. Bright features like the planet’s Great Red Spot are higher in the atmosphere, and so have less of their light absorbed by the methane. Image: NASA/JPL-Caltech/SwRI/MSSS.

“This is the first time we will be close to Jupiter since we entered orbit on July 4,” said Scott Bolton, principal investigator of Juno from the Southwest Research Institute in San Antonio. “Back then we turned all our instruments off to focus on the rocket burn to get Juno into orbit around Jupiter. Since then, we have checked Juno from stem to stern and back again. We still have more testing to do, but we are confident that everything is working great, so for this upcoming flyby Juno’s eyes and ears, our science instruments, will all be open.”

“This is our first opportunity to really take a close-up look at the king of our Solar System and begin to figure out how he works,” Bolton said.

While the science data from the pass should be downlinked to Earth within days, interpretation and first results are not expected for some time.

“No other spacecraft has ever orbited Jupiter this closely, or over the poles in this fashion,” said Steve Levin, Juno project scientist from NASA’s Jet Propulsion Laboratory in Pasadena, California. “This is our first opportunity and there are bound to be surprises. We need to take our time to make sure our conclusions are correct.”

Not only will Juno’s suite of eight science instruments be on, the spacecraft’s visible light imager — JunoCam will also be snapping some closeups. A handful of JunoCam images, including the highest resolution imagery of the Jovian atmosphere and the first glimpse of Jupiter’s north and south poles, are expected to be released during the later part of next week.