JIRAM mirror issues Options

[volcanopele]

Not really. A lot of the questions an Io mission would seek to answer can't really be answered by the Juno encounters. JunoCam doesn't have the resolution or the image cadence. JIRAM doesn't have the wavelength coverage to do eruption temperature measurements (and the stuck mirror basically makes the spectrometer not all that useful even for the wavelength span it CAN do). The encounter timing and encounter altitude isn't optimized for measuring libration, the induced magnetic field, or gravity field. Don't get me wrong, I am VERY excited about an Io encounter, but no, Juno is not a substitute for a dedicated mission. It does help fill the gap between Galileo/NH and an Io Observer/EC/JUICE. And it definitely adds so much needed data points, like acting as a "scout" for North polar geology.

The bigger concern is that CAPS will do what the Decadal did and think, well, IVO was successful in Discovery so why does it need to be a NF mission, neglecting a lot of programatic issues that helped make IVO successful last go around but won't be successful in the future, like putting Phase E back in the PI-managed cost.

[bobik]

... and the stuck mirror basically makes the spectrometer not all that useful even for the wavelength span it CAN do...

The de-spinning mirror of JIRAM is sticking!? When did this happen?

[volcanopele]

You’re clear Mike. Scott Bolton brought it up at OPAG a few months back. The only public info is that the spin-compensation mirror is stuck and has been since PJ44. I have no knowledge beyond the fact that the publicly released JIRAM image from PJ49 was also smeared like PJ47.

[bobik]

Scott Bolton brought it up at OPAG a few months back. The only public info is that the spin-compensation mirror is stuck...

Yeah, the recording can be found here. But it may take some time to get detailed information. Embargoed until October 26, 2100!

[Tom Tamlyn]

I trust that "2100" is a typo of some kind?