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Juno is now 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”).
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.
The target prioritization and selection process is ordinarily done by an imaging science team in a conference room or on a telecon. Each scientist argues for their top candidates and says why they are important.
In general we are holding back enough data volume for 2 polar images. Occasionally we will also set aside some data volume for a unique image of a Galilean satellite. All the rest of the data volume will be used to target images in the priority determined by the voting.
You will be a participant in the discussions we would otherwise have off-line. The Juno science team will be weighing in with their wishes, but they will have to advocate and convince you to vote for their favorites. 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.