PILOT is a balloon-borne astronomy experiment, designed to study the polarization of interstellar dust emission in our Galaxy. The PILOT instrument will allow simultaneous observations in two photometric channels at wavelengths 240 μm (1.2 THz) and 550 μm (545 GHz). The angular resolution is better than 3.5 arc minutes over an instantaneous field of view of 0.8°x1°, with diffraction limited image quality.
C. Engel, C. Engel,
"Optical characteristics and performances of the PILOT balloon-borne experiment", Proc. SPIE 10564, International Conference on Space Optics — ICSO 2012, 105643X (10 January 2018); doi: 10.1117/12.2309251; https://doi.org/10.1117/12.2309251