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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 : 2021-06-07 00:00:00
Perijove on : 2021-06-07 09:32 UT
About This Round
Juno will make a very close pass past Jupiter's large moon Ganymede. Ganymede is the largest moon in the solar system and has its own magnetosphere. This affects weathering of the surface, because charged particles from Jupiter's magnetosphere can travel along open field lines at Ganymede, but are blocked by closed field lines. JunoCam will image approximately one half of one side of Ganymede, as the spacecraft is flying by at ~90 deg phase angle. This is territory that was imaged by Voyager 42 years ago. The closest approach will be at 1044 km, which gives JunoCam images a resolution of 1-3 km/pixel, roughly equivalent to Voyager images. The closest approach will be at lat / lon = 23.7 N / 57.5 W.
About 15 hours later Juno will make its 34th perijove pass by Jupiter. JunoCam images will follow the usual sequence of inbound lightning search, north polar images, perijove swath, south polar images, and outbound departure movie.
Perijove Predict MapWinner Selection
The longitude of the PJ pass for PJ34 is almost the same as the longitude of PJ33. This gives us an opportunity to re-image storms after 53 days to study dynamics (if the storms are not moving much relative to the L3 longitude system). We will be looking for Clyde's Spot on the limb. This will be true again at PJ35.