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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.
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.
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.
Voting Round :
CLOSED : 2017-01-23 17:00:00
Perijove on : 2017-02-02 12:59 UT
About This Round
This will be the first time we open up the complete perijove pass for images you select. BE SURE if you have a candidate that you have entered a POI for it! We go by votes, not by sites suggested in the comments. On every pass we will take an image of the north pole and an image of the south pole. The rest are up to you! The spacecraft orientation is what we call "MWR-nadir". It is optimized for the MicroWave Radiometer instrument so the effect is to point JunoCam at the groundtrack below the spacecraft, not offset to the side.
Perijove Predict MapWinner Selection
The votes are in! We will be able to image the top 10 in the priority set by your votes. In addition we will pick up 5 others because they are close in latitude to the top vote-getters. This assumes of course that the we have done a good job in predicting the wind speed at each latitude, and where the points of interest will be. Our top vote recipient, Oval BA, is right on the edge of where we predict we will be able to image, so we have our fingers crossed that we will get that one.
We started the process of generating image commands as soon as the voting closed. We looked first at the predictions of what time an image would need to be taken to get a particular POI. We have constraints on how closely together we can take images, because an image must be moved from the camera to the spacecraft computer before we take the next one. That means if targets are closer together in time than 90 sec we combined them. We took the time that corresponded to the higher priority target, but we will get the other POI's in the image.
We then started planning images in priority order until we used up all the available data volume.
The list of POI’s we will image in order of the votes they received is as follows, with the “+” indicating targets we combined:
Structure01 + Outbreak!
The big red stripe v2
Turbulence + Hotspot
The wonderful south pole
Dark spot in turbulence + White spot Z + Band transition
North pole on Jupiter + Darker skies
Cap of Jupiter
These images will be available after we get "C kernels" which is a file with the spacecraft orientation as a function of time. This data is necessary for us to process the data before we put it on the website. It takes two days for us to get that data from the navigation team. Since that is a Saturday we will begin running the data through our pipeline on Monday.