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We report the discovery of a cold planet with a very low planet/host massratio of $q=(4.09\pm0.27) \times 10^{-5}$, which is similar to the ratio ofUranus/Sun ($q=4.37 \times 10^{-5}$) in the Solar system. The Bayesianestimates for the host mass, planet mass, system distance, and planet-hostprojected separation are $M_{\rm host}=0.76\pm 0.40 M_\odot$, $M_{\rmplanet}=10.3\pm 5.5 M_\oplus$, $D_{\rm L} = 3.3\pm1.3\,{\rm kpc}$, and $a_\perp= 3.3\pm 1.4\,{\rm au}$, respectively. The consistency of the color andbrightness expected from the estimated lens mass and distance with those of theblend suggests the possibility that the most blended light comes from theplanet host, and this hypothesis can be established if high resolution imagesare taken during the next (2020) bulge season. We discuss the importance ofconducting optimized photometry and aggressive follow-up observations formoderately or very high magnification events to maximize the detection rate ofplanets with very low mass ratios.

KMT-2019-BLG-0842Lb: A Cold Planet Below the Uranus/Sun Mass Ratio