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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 : 2017-12-16 00:00:01
Perijove on : 2017-12-16 17:58 UT
About This Round
The orbit of Juno around Jupiter is evolving. As Jupiter moves in its orbit around the sun, Juno's orbit is rotating more and more to the nightside of the planet. We need to keep the solar arrays pointed at the sun for our solar-powered spacecraft and that means that Jupiter is in the JunoCam field of view for less time and is offset from the boresight near closest approach. As a result it is getting more difficult to predict which Points of Interest will be in the images.
In addition, JunoCam has been assigned more onboard storage space. This means that there are fewer decisions to be made about prioritizing the images to be taken.
Because the lighting and viewing geometry is still good on this pass, we've planned a perijove pass that has more uniform latitudinal spacing of the images. This will enable production of smoother movies as Juno flies from the north pole to the south pole on December 16. We are also reducing the amount of compression for the closest images to minimize compression artifacts.
We are planning time-lapse sequences of both polar regions to see the rotation of the circumpolar cyclones.