Juno perijove 5, March 27, 2017 |
Juno perijove 5, March 27, 2017 |
Mar 16 2017, 10:24 PM
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IMG to PNG GOD Group: Moderator Posts: 2254 Joined: 19-February 04 From: Near fire and ice Member No.: 38 |
Juno's perijove 5 is coming up less than two weeks from now - it's on March 27, 2017.
The target selection voting has started and is open until almost four days from now: https://www.missionjuno.swri.edu/junocam/voting?current A large part of the data volume will be reserved for polar time lapse sequences though. John Rogers has written a helpful summary of the upcoming perijove 5: https://www.britastro.org/node/9377 |
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Mar 28 2017, 11:43 PM
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Junior Member Group: Members Posts: 71 Joined: 12-December 16 Member No.: 8089 |
The image of Trevmation's Dark Spot was reportedly taken at a distance of only 3,421.8 km, according to its metadata. Can this be true? Because if so, that's a thousand kilometers less than expected, and most certainly the closest approach of the mission so far.
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Mar 29 2017, 02:51 AM
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Senior Member Group: Members Posts: 2542 Joined: 13-September 05 Member No.: 497 |
The image of Trevmation's Dark Spot was reportedly taken at a distance of only 3,421.8 km, according to its metadata. Can this be true? Because if so, that's a thousand kilometers less than expected... Expected by who? Obviously the metadata was computed with a predicted spacecraft position and that may change a little once we have the reconstruction, but I'm fairy confident that the calculation is right. Keep in mind that because of Jupiter's oblateness, the geometry to figure out the altitude is a little more complex than simply taking the distance to the center of Jupiter and subtracting the radius of Jupiter, which is what a simple calculation might do. Here's the code that computes the metadata if you're interested (in Python, using NAIF/pyspice): CODE te = spkezr("juno", t, "iau_"+target, "LT+S", target)[0][0:3] radii = bodvrd(target, "RADII", 3)[1] lon, lat, alt = recpgr(target, te, radii[0], (radii[0]-radii[2])/radii[0]) -------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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