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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 : 2016-12-02 00:00:01
Perijove on : 2016-12-11 17:05 UT
About This Round
Juno will be oriented such that the High Gain Antenna points to earth for a gravity pass. That means that the JunoCam field of view will be slightly offset from nadir.
We are continuing to test various modes of the camera so we will only be able to include 1 - 3 targets selected by the public. This should be the completion of camera testing, so that on PeriJove 4 (PJ4) we will welcome public input for all the images we take crossing through perijove.
The number of images we take is limited by our onboard storage. Each picture requires a different amount of data volume so in general we will take a different number of images every PJ. We will rank the selection by the number of votes you cast.
The results are in! We are still testing the camera settings so we limited our choices from the public vote to 3. At PeriJove 4 (PJ4) we will open up the entire set of possibilities. Our winners from this round are POI NCC 1701, String of Pearls, and Weird Dark Spot.
We are in a unique situation this time because we have limited planning data to go by. Jupiter has been very close to the sun, so our amateur astronomer inputs are not as longitudinally complete as usual, so the cylindrical map that we identify viewable POI's on is not as recent as we'd like. The winds in Jupiter's belts and zones move at different speeds and directions, so predicting what will be in our field of view was challenging. We will schedule the images so that we should see our winners, but we will be as curious as you to see if we actually capture them!