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There are approved proposals for Cycle 1 to point the JWST at The Jovian system Jupiter's great red spot Mars Saturn and its moons and rings In those PDFs, they describe exactly what instruments they want to point where, but to summarize as far as I can tell they're planning to try to use pretty much all of the available instruments to image Jupiter and ...


7

All modes can be used. But for bright targets, observations are limited to specific filters, subarrays, regions of the target planet, or spectral intervals. James Norwood and colleagues wrote a paper on this topic, although the full answer is complicated because of the "subset of the instrument modes" part. The simplest answer to understand is for ...


6

Each of James Webb's mirror segments are adjustable through seven small motors, called actuators. Due to thermal variations, the segments do indeed need to be re-adjusted occasionally. Exactly how often is a compromise between desired image quality and valuable science observation time, as argued by Park et al. (2017) who develop a thermal model, but don't ...


3

How does IXPE measure polarization? Short answer: Electrons in the detector are preferential emitted in the direction of the polarization of the incident photon and then detected. Quoting from NASA's IXPE: Polarization Detection page: IXPE will have three identical X-ray telescopes, with polarization detectors at each focus. The detectors, called Gas Pixel ...


2

In the video, the white dots represent 14000 asteroids, and the green tracks are 200 of the brightest asteroids. These are from standard catalogues. Gaia has detected about 1700 asteroids, but most of these were already known. The video shows four newly discovered object, in pink. They have provisional designations 2018 YK4, 2018 XL4, 2018 YM4 and 2019 CZ10....


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