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In 2018, the near-Earth object (155140) 2005 UD (hereafter UD) experienced a close fly by of the Earth. We present results from an observational campaign involving photometric, spectroscopic, and polarimetric observations carried out across a wide range of phase angles (0°.7–88°). We also analyze archival NEOWISE observations. We report an absolute magnitude of HV=17.51±0.02 mag and an albedo of pV=0.10±0.02. UD has been dynamically linked to Phaethon due their similar orbital configurations. Assuming similar surface properties, we derived new estimates for the diameters of Phaethon and UD of D=5.4±0.5 km and D=1.3±0.1 km, respectively. Thermophysical modeling of NEOWISE data suggests a surface thermal inertia of G = + 300 110 120 and regolith grain size in the range of 0.9–10 mm for UD and grain sizes of 3–30 mm for Phaethon. The light curve of UD displays a symmetric shape with a reduced amplitude of Am(0)=0.29 mag and increasing at a linear rate of 0.017 mag/° between phase angles of 0° and ∼25°. Little variation in light-curve morphology was observed throughout the apparition. Using light-curve inversion techniques, we obtained a sidereal rotation period P=5.235±0.005 hr. A search for rotational variation in spectroscopic and polarimetric properties yielded negative results within observational uncertainties of ∼10% μm and ∼16%, respectively. In this work, we present new evidence that Phaethon and UD are similar in composition and surface properties, strengthening the arguments for a genetic relationship between these two objects. Unified Astronomy Thesaurus concepts: Near-Earth objects (1092); CCD observation (207); Astronomical techniques (1684); Photometry (1234); Polarimetry (1278); Spectroscopy (1558)

New Evidence for a Physical Link between Asteroids (155140) 2005 UD and (3200) Phaethon*