Voting
Welcome!
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.
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.
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.
Target Selection
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.
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 :
PJ19 Encounter
CLOSED : 2019-04-06 00:05:00
Perijove on : 2019-04-06 13:30 UT
The spacecraft orientation for this perijove pass was non-standard. The spacecraft was rotated to allow the MicroWave Radiometer to observe orthogonal to the routine data collection attitude. This orthogonal orientation allows the sun to pass through JunoCam's field of view, which could cause damage if JunoCam inadvertently imaged the sun. For this reason the decision was made to delay powering on the camera until after the return to a nominal spacecraft attitude.
JunoCam was powered on 45 min after closest approach and took the first image at PJ+50 min. By this time only the southern hemisphere is in view. Since there was plenty of data volume we chose to return all the images with lossless data compression. South polar movies alternate time-delayed integration settings to be optimal for the disk (TDI 1 or 3) and for the terminator (TDI 3 and 6). Two additional images bracket the pole with TDI 9, knowing that the limb would be saturated. Two sequences of methane images are collected with minimal time separation to allow stacking of the frames.
The final hours outbound are looking at the dark side of Jupiter, so we will do our first search for lightning looking at the southern hemisphere.
JunoCam was powered on 45 min after closest approach and took the first image at PJ+50 min. By this time only the southern hemisphere is in view. Since there was plenty of data volume we chose to return all the images with lossless data compression. South polar movies alternate time-delayed integration settings to be optimal for the disk (TDI 1 or 3) and for the terminator (TDI 3 and 6). Two additional images bracket the pole with TDI 9, knowing that the limb would be saturated. Two sequences of methane images are collected with minimal time separation to allow stacking of the frames.
The final hours outbound are looking at the dark side of Jupiter, so we will do our first search for lightning looking at the southern hemisphere.
About Perijove Predict Maps
Every perijove pass we have the challenge of predicting where Points of Interest will be as the different zones of the planet have different wind velocities. This map shows our effort to rotate the latitudinal zones with their different wind speeds to predict what will be under the Juno groundtrack.
Round Discussion
General discussion about this round.
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