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We present mid-infrared spectra from our continued monitoring of R Aquarii,the nearest symbiotic Mira, using the Stratospheric Observatory for InfraredAstronomy (SOFIA). New photometric and spectroscipic data were obtained withthe Faint Object infraRed CAmera for the SOFIA Telescope (FORCAST) in 2018 and2019 after the system had started its "eclipse", during which it became twomagnitudes fainter in the visual. The mid-IR flux, in particular the 10 mu-msilicate feature, have strengthened compared with the previous cycles.Radiative transfer models for the circumstellar dust emission were calculatedfor the new spectra, and re-calculated for those previously obtained using moreappropriate values of the near-IR magnitudes to constrain the properties of theAGB spectra heating the dust. The modeling shows that the luminosity dependenceon pulsation phase is not affected by the onset of the eclipse, and that theincrease in the mid-IR flux is due to a higher dust density. The models alsoconfirm our earlier results that micron-size grains are present, and that nochanges in the grain composition are required to explain the variations in thespectra.

SOFIA/FORCAST Monitoring of the Dust Emission from R Aqr: Start of the Eclipse