Juno development, launch, and cruise, Including Earth flyby imaging Oct 9 2013 |
Juno development, launch, and cruise, Including Earth flyby imaging Oct 9 2013 |
Apr 3 2006, 09:57 PM
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Member Group: Members Posts: 172 Joined: 17-March 06 Member No.: 709 |
I thought that it was time to start a new thread devoted to the JUNO Jupiter
Orbiter mission. This New Frontiers Mission #2 seems to be a "stealth" project with little information available on the Web. In fact, the official NASA JUNO web site is quite pitiful. It contains the minimal amount of information on what seems to be an intriguing mission, in terms of both science and engineering. Does the UMSF community have information on this mission that has not been widely seen before? Another Phil |
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Guest_Richard Trigaux_* |
Jul 20 2006, 06:02 AM
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Guests |
Will the effect of these bulges be detectable by analysing Juno's position?
Analysing this position alone will be a great chalenge, as, if Juno changes speed and trajectory relative to the bulges, the moons too will do this. So assessing the trajectory alone will already be very complex, especially if the only reference is the set of jovian moons. With my opinion, we need some other stable references: -ultra stable radio uplink from Earth -using pulsars or other stable galactic source -measuring star position. Once the movement known, analysing tidal effects will too be complicated. Tides are basically waves, which want to propagate at their own speed, independently of the astronomical cause. On Earth such waves can resonate into large oceans, giving a different tide regime for the atlantic ocean and the pacific ocean. On Jupiter, we can think that we shall have resonances along the equator, or more likely different spherical vibration modes. Some will be directly excited by one of the moons, some will on the countrary opose to the excitation by one of the moons. In a first approximation, we shall have linear waves, or more accurately a spectrum of discreet vibration modes. This will already allow us to sense the depth of the atmosphere and obtain a pressure profile. (if the waves go deep enough. This is not sure, and in heliosysmology there is still a lack of modes involving the core). In a second step, discrepancies to the linear models will allow us to search for non linear effects, such as damping, elliptic shape of the layers, movements, layers of helium or layers of hydrogen, etc. The dream would be, like as in heliosysmology which is now able to sense the presence of spots on the opposite side, to see inner Jupiter features like large storms, solid surface features, or convection patterns. After a computer model which was made several years ago, Jupiter would contain a set of several vortexes, paralel to its rotation axis, but avoiding the solid core. What will be ultimately possible to see will depend on the accuracy of trajectory measurement, I think. This is worth adding some weight, like a telescope (to sense stars) or a set of large antennas. |
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