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In 2019, the Research and Education Collaborative Occultation Network (RECON)obtained multiple-chord occultation measurements of two centaur objects: 2014YY$_{49}$ on 2019 January 28 and 2013 NL$_{24}$ on 2019 September 4. RECON is acitizen-science telescope network designed to observe high-uncertaintyoccultations by outer solar system objects. Adopting circular models for theobject profiles, we derive a radius $r=16^{+2}_{-1}$km and a geometric albedo$p_V=0.13^{+0.015}_{-0.024}$ for 2014 YY$_{49}$, and a radius $r=66^{+5}_{-5}$km and geometric albedo $p_V = 0.045^{+0.006}_{-0.008}$ for 2013NL$_{24}$. To the precision of these measurements, no atmosphere or rings aredetected for either object. The two objects measured here are among thesmallest distant objects measured with the stellar occultation technique. Inaddition to these geometric constraints, the occultation measurements provideastrometric constraints for these two centaurs at a higher precision than hasbeen feasible by direct imaging. To supplement the occultation results, we alsopresent an analysis of color photometry from the Pan-STARRS surveys toconstrain the rotational light curve amplitudes and spectral colors of thesetwo centaurs. We recommend that future work focus on photometry to moredeliberately constrain the objects' colors and light curve amplitudes, and onfollow-on occultation efforts informed by this astrometry.

The Sizes and Albedos of Centaurs 2014 YY $_{49}$ and 2013 NL $_{24}$ from Stellar Occultation Measurements by RECON