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 : 2020-04-10 00:00:00
Perijove on : 2020-04-10 13:47 UT
About This Round
In a polar orbit Juno seldom passes close to the galilean satellites of Jupiter. PJ26 offers us a rare opportunity to image Io and Europa at moderately close range. The spacecraft will fly by Io at 233,363 km and by Europa at 144,130 km. On Io that means JunoCam can image terrain at 148 km/pixel, and at Europa JunoCam images will be 91 km/pixel. JunoCam will have a good view of the terminator (the day-night boundary) on both moons, so our goal will be to look for any sign of an eruption, similar to the volcanic eruption imaged on Io on PJ17.
Perijove Predict MapWinner Selection
In addition to images of Io and Europa we will acquire high resolution images of the circumpolar cyclones at Jupiter's north and south pole, Oval BA, and the South Temperate domain. As the closest approach moves northward the the images show ever more detail in the turbulent region at high northern latitudes.