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Sensitive wide-field observations of polarized thermal emission frominterstellar dust grains will allow astronomers to address key outstandingquestions about the life cycle of matter and energy driving the formation ofstars and the evolution of galaxies. Stratospheric balloon-borne telescopes canmap this polarized emission at far-infrared wavelengths near the peak of thedust thermal spectrum - wavelengths that are inaccessible from the ground. Inthis paper we address the sensitivity achievable by a Super Pressure Balloon(SPB) polarimetry mission, using as an example the Balloon-borne Large ApertureSubmillimeter Telescope (BLAST) Observatory. By launching from Wanaka, NewZealand, BLAST Observatory can obtain a 30-day flight with excellent skycoverage - overcoming limitations of past experiments that suffered from shortflight duration and/or launch sites with poor coverage of nearby star-formingregions. This proposed polarimetry mission will map large regions of the sky atsub-arcminute resolution, with simultaneous observations at 175, 250, and 350$\mu m$, using a total of 8274 microwave kinetic inductance detectors. Here, wedescribe the scientific motivation for the BLAST Observatory, the proposedimplementation, and the forecasting methods used to predict its sensitivity. Wealso compare our forecasted experiment sensitivity with other facilities.

The BLAST Observatory: A Sensitivity Study for Far-IR Balloon-borne Polarimeters