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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 : 2019-02-12 00:00:00
Perijove on : 2019-02-12 17:36 UT
About This Round
The spacecraft will pass close to the Great Red Spot again. The orientation of the spacecraft is optimized for gravity science, so it will not be ideal for imaging, but we will get great views from a perspective south of the GRS. Juno approaches Jupiter from the dark side, so we will carry out a lightning search campaign inbound. We know that there are lots of lightning storms so we just need to be lucky to catch a flash! After closest approach (perijove) Jupiter will only be visible at the edge of the JunoCam field of view. In contrast to previous flybys our coverage will be sparse in the latitude zone from the equator to the GRS because images of just the limb of Jupiter aren't as important as other targets. Once most of the disk of Jupiter is in the JunoCam field of view again, as the spacecraft is outbound, we will take numerous images of the south pole. Many of these will be taken in pairs so that we can have two integration times. With a long integration time we can see closer to the terminator but we saturate the lower latitudes. We will use the shorter integration images to map those latitudes.