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Juno is in a 53-day orbit. When it passes close to Jupiter (“PeriJove”
or “PJ”) we will take as many pictures as we can. The number of pictures that we take is
limited by the amount of onboard data storage that we have for JunoCam, so we
have to be selective. The images are
collected as we go from the north pole of Jupiter to the south pole, which
happens in a brief 2 hour portion of the orbit.
On any given perijove pass we will only be able to image targets in a
narrow swath of territory the spacecraft flies over (“groundtrack”).
Juno’s orbit geometry is evolving so we will carry out
campaigns rather than voting on specific targets. Campaigns are focused on a specific science
theme and take advantage of the changes in lighting.
What happened to Voting?
Up through PJ8 everyone could vote on their favorite Point
of Interest (POI) and those rounds can be viewed here. Changes in the orbit and mission plan mean
that we are no longer selecting targets by vote.
There will still be a voting page for every orbit and we
will describe the specifics of each perijove pass such as the spacecraft
orientation. Because of the challenges
to predict the Points of Interest that will be in the JunoCam field of view we
are now timing the image collection by latitude and/or executing campaigns.
We will take polar images on every PJ pass to assemble
timelapse sequences to study the dynamics of the circumpolar cyclones. Between the north and south pole images will
be timed to get complete latitudinal coverage.
The rest of the resources will be used for campaigns. Options are to look for lightning, take
multiple methane images to study high altitude hazes, study Jupiter’s ring,
take stereo pairs for cloud altitudes, image Galilean moons when available, etc. We will keep the Voting Round discussion for
comments on what would be best. We are
hoping that you enjoy being a part of this process, that you enjoy being a member
of the JunoCam team.
Voting Round :
CLOSED : 2020-11-08 00:00:00
Perijove on : 2020-11-08 01:49 UT
About This Round
There are no good opportunities for satellite imaging on this pass so all JunoCam’s data volume will be devoted to imaging Jupiter. The sequence begins with lightning search images a few hours from perijove as Juno approaches Jupiter from the night side. The northern circumpolar cyclones come into view at about 40 min before closest approach. JunoCam images will go through a range of levels of Time-Delayed-Integration to achieve long exposures to image close to the terminator. Some levels will over-expose the limb, but it is worth it to see the clouds near the edge of darkness. Next JunoCam will image the turbulent storms known as the “Folded Filamentary Regions”, followed by the northern jets, as Juno sweeps rapidly across the northern hemisphere. Perijove occurs over Jet N2 at a latitude of ~30N. The spacecraft departs over the southern hemisphere at a more leisurely pace allowing us to schedule multiple images of the equatorial zone, the South Temperate Belt, the white ovals in the string of pearls, and finally the southern circumpolar cyclones. Lightning searches on the dark side in the southern hemisphere end the sequence.
Perijove Predict MapWinner Selection
The slow pass over Jupiter's southern hemisphere with lots of repeat coverage enables study of the dynamics of Jupiter's storms and jets. Conversely the low pass over the northern hemisphere will give us the highest resolution images ever of Jupiter's northern storms.