My day had a twitter (tm) component in which I asked about the correspondences between gaps in Saturns rings and low-integer-denominator resonances with Saturns moons (and, I learned, planetary seismic modes). This led me to Jason Hunt (Flatiron), who I asked about resonances in the Milky Way disk: Can the gaps in velocity space in the local disk be associated cleanly with particular resonances with the bar or spiral structure or Sagittarius? He thought yes, for some, and made some nice plots of the three orbital frequencies as a function of velocity in the local neighborhood. These are all steps towards (in my mind) figuring out the frequencies of disk perturbations more-or-less directly from the data.
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