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 : 2018-04-01 00:00:00
Perijove on : 2018-04-01 09:47 UT
About This Round
As Juno's orbit evolves we are spending more time on the night side of Jupiter, and perijove is moving closer to the subsolar point. The orbit is also rotating such that the closest approach point is moving northward. In order to take advantage of good lighting while we can the project agreed to re-orient the Juno spacecraft for this pass. We will not be voting this pass - go to winner selection to read how the images will be taken.
We will start inbound imaging 19 hours before the closest approach. These distant images are at a high phase angle but will give us context for later images.
About 2 hours from closest approach we will image Io. We are planning to take two pictures - one exposed nominally and one that over-exposes Io to look for volcanic plumes extending above the surface.
For the 2 hours between our best view looking down at the north pole and looking up at the south pole JunoCam will carry out several campaigns.
Timelapse sequences of images of the north pole and the south pole will allow us to generate movies showing the motions of the circumpolar cyclones.
The Great Red Spot (GRS) is close to Juno's ground track. We will image the region just east of the GRS when we are close. As the spacecraft recedes from Jupiter and our field of view covers more territory we will capture the Great Red Spot in its entirety.
Towards the end of the perijove pass we will image Ganymede. Update: We missed Ganymede, but Io is in this image.