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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 : 2017-07-03 17:00:00
Perijove on : 2017-07-11 01:55 UT
About This Round
In this perijove pass the Juno spacecraft will fly over the Great Red Spot (GRS), a storm that has been churning for centuries. We will set aside enough data volume for a close image directly over this storm. The rest is up to you! We think that the atmosphere north and south of the Great Red Spot is very interesting also, so we expect lots of advocacy for those points of interest. We will take some standard images of the north and south poles, but we will do only minimal time-lapse imaging, to conserve data volume for the GRS and its environs. Data volume is somewhat limited on this perijove pass because the spacecraft will be in an orientation that is favorable for Juno's microwave radiometer to study the GRS. In this orientation we don't have a real-time downlink connection to earth, so the number of images we can take is limited by the JunoCam buffer size.
Perijove Predict MapWinner Selection
A little more information: We "target" the JunoCam images based solely on timing. The timing of an image is set to acquire a given latitude. Ordinarily we accept that drift rates of storms are not well-known, and we may or may not actually image a specific feature for that reason. In this case the position of the GRS is extremely well-known, and latest predicts show that we will pass directly over the center. That means that we actually will not image the POI's to the east and west of the GRS, even though they have been included in the "selected" list due to being at ~the same latitude.
Late Update: We needed to adjust the timing of the Great Red Spot images a little bit, and that meant that we lost the image of POI: "End of the White Highway". This is not unusual - we make adjustments as our knowledge of the spacecraft trajectory improves. We were able to add "Juno Eye" to use the freed-up data volume.
Bold circles show the final selected targets.
The focus on this pass is the Great Red Spot (GRS). We will be taking images of the northern edge, the GRS itself, and the view from the south. These three images will include the POIs “The Great Red Spot”, “Within the wake of the Great Red Spot”, “Edge of Great Red Spot”, “Wake”, “Lower Great Red Spot Atmospheric Flow”, and “Fractured Boundary”. Not surprisingly these targets got the most votes. As in the past we were able to combine some other targets. The other high vote-getters we were able to fit into the available data volume are: “Flower Moon” + “Dark Clouds”; “White Spot B”; “Complex High Contrast”; “Hot Spot Tail” + “Hot Spot”; “Mortyland” + “Edge of the White Highway”; and “Tan Seashore”.