Presentation #407.02 in the session Stars, Cool Dwarfs, Brown Dwarfs I.
The U.S. Naval Observatory (USNO) near-infrared astrometry program for low-mass stars and brown dwarfs operated in two segments from 2001-2006 and 2011-2019. Observations were obtained with the 61-inch Kaj Straand Astrometric Reflector at the USNO Flagstaff Station. During this time results were obtained for 180 objects with spectral types ranging from L0 to T8/9 with apparent magnitudes down to J,H ~18 mag. An overview of results from this program will be presented, with median errors of approximately 1.5 mas and 1.0 mas/yr, respectively, for absolute parallaxes and absolute proper motions and with best results at 0.5 mas and 0.3 mas/yr, respectively. Our results are in excellent agreement with those of Gaia for the 43 objects in the general overlap region hotter than about L4. These results are a significant improvement on measurements from previous near-infrared ground-based astrometry programs.