in the size range of approximately are transitional between smaller, porous (and thus low-density) bodies and larger, denser, brighter and geologically differentiated planetary bodies such as dwarf planets. Huya is situated at the lower end of the size range, implying that Huya's interior structure is likely highly porous and undifferentiated since its formation and thus is unlikely to be in hydrostatic equilibrium. In a 2014 study, Audrey Thirouin and colleagues had suggested that the minimum density of Huya was , but this was a rough estimate derived indirectly from variations in brightness. Based on a 2019 stellar occultation, Santos-Sanz et al. found a density of about if Huya is a Maclaurin spheroid, and if it is a Jacobi ellipsoid; however, the occultation found no evidence of an irregular shape for Huya, with their 2022 paper describing the Plutino as being at least consistent with "a very round object". Spectra and surface The reflectance spectrum of Huya appears moderately red and featureless in the infrared spectrum, lacking apparent absorption signatures of water ice and other volatile materials. The scattered disc object shares a similarly featureless spectrum with Huya, though their visible colors differ. Huya's featureless spectrum indicates that its surface is covered with a thick layer of dark organic compounds irradiated by solar radiation and cosmic rays. Although water ice appears to be absent in Huya's infrared spectrum, some astronomers have detected subtle signs of water ice in its visible spectrum in 2011 and 2017. The discrepancy of the presence of water ice between the visible and infrared spectra of Huya was interpreted as an indication of heterogeneity in Huya's surface composition. Huya's surface is homogeneously covered with trace amounts of water ice, as subtle water ice absorption features recur in multiple observations of Huya's visible spectrum over the course of its rotation. Early observations of Huya's spectrum in 2000 have identified a red spectral slope at wavelengths around 0.7 μm, typical of dark trans-Neptunian objects. Additional near-infrared absorption features were also identified, and were attributed to the presence of aqueously altered silicate minerals on Huya's surface. The red color of Huya's surface results from the irradiation of organic compounds by solar radiation and cosmic rays, which produces dark, reddish tholins that cover its surface. Huya's featureless spectrum indicates that its surface is covered with a thick layer of dark organic compounds irradiated by solar radiation and cosmic rays. Compared to