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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 : 2018-10-29 00:00:00
Perijove on : 2018-10-29 21:07 UT
About This Round
For PJ16 the spacecraft will be oriented such that the camera field of view is pointed towards the groundtrack - the swath of the cloudtops the spacecraft is flying over - rather than oriented with the high gain antenna pointed at earth (the more typical attitude, designed to optimize the gravity interior structure experiment). This means that the images will contain more Jupiter, less sky, and the illumination will be better.
PJ16 also occurs when the earth is close to being behind the sun as seen from Juno. Downlink of data to the earth is always minimal at these times because the proximity to the sun means we must reduce the data rate to earth or the link will be noisy.
For these two reasons we are focusing our limited data volume on the perijove pass and we will not be taking pictures on approach or departure.
As we approach the north pole from the night side of Jupiter we will take a series of images with varying amounts of time-delayed-integration, to see what is the best choice between seeing into the shadows at the north pole, and avoiding saturation of more southerly latitudes. This pass we hope to see where circumpolar cyclone #7 has moved, and interestingly whether some other atmospheric feature has pushed it there.
The series of northern hemisphere images will include a nice image of White Spot Z. The spacecraft reaches perijove at a latitude of ~19 deg North as the orbit continues to evolve.
We look forward to seeing more mesoscale waves near the equator. In the southern hemisphere we expect to get a good look at Oval BA.
As the spacecraft departs we will collect a 40 min timelapse sequence of the south pole.