Juno photos… October 9, 2016Posted by WorldbyStorm in Uncategorized.
Juno’s highly elliptical polar orbit takes it close to the planet—within 4,300 kilometers (2,700 mi)—but then far beyond even Callisto’s orbit. An eccentricity-reducing burn that will drop the probe into a much closer orbit—one designed to bring the spacecraft within 2,000 km (1,200 mi) of the cloud tops that is necessary for the key data gathering phase — is planned for October 19, 2016, after which the orbital period will be 14 days. Each of the lower science-gathering orbits takes 14 days and the spacecraft is expected to complete 37 orbits until the end of the mission. Both orbits exploit a gap in the shape of the radiation envelope near the planet, flying past quickly in a region of minimized radiation, to maintain viability of the spacecraft.
These orbits minimize contact with Jupiter’s dense radiation belts that can damage spacecraft electronics and solar panels. The “Juno Radiation Vault”, with 1-centimeter-thick titanium walls, will also aid in protecting and shielding Juno’s electronics. Despite the intense radiation, JunoCam and Jovian Infrared Auroral Mapper (JIRAM) are expected to endure at least eight orbits, while the microwave radiometer should endure at least eleven orbits. In comparison, Juno will receive much lower levels of radiation than the Galileo orbiter at its equatorial orbit.
The spacecraft completed its first flyby of Jupiter on August 27, 2016, and sent back the first-ever images of the planet’s north pole.
By the by, notable in these photographs is how desaturated the colours of Jupiter are. Anyone who has seen 2010: Odyssey Two will perhaps recall just how red Jupiter was in those film. Postively ochre. Whereas in this it is a much more muted colour palette. I wonder is that an artefact of the processing of the photographs or is it an accurate representation? Comparing and contrasting earlier photographs of Earth taken by Juno suggests that the latter is the case.