[en] 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 H[SUB]V[/SUB] = 17.51 ± 0.02 mag and an albedo of p[SUB]V[/SUB] = 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 ${\rm{\Gamma }}={300}_{-110}^{+120}$ 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[SUP]-1[/SUP] 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. [SUP]*[/SUP] Partially based on data collected with 2 m RCC telescope at Rozhen National Astronomical Observatory.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Devogèle, Maxime; Lowell Observatory, 1400 W. Mars Hill Rd., Flagstaff, AZ 86001, USA
MacLennan, Eric; Department of Physics, P.O. Box 64, FI-00014 University of Helsinki, Finland
Gustafsson, Annika; Department of Astronomy & Planetary Science, Northern Arizona University, P.O. Box 6010, Flagstaff, AZ 86011, USA
Moskovitz, Nicholas; Lowell Observatory, 1400 W. Mars Hill Rd., Flagstaff, AZ 86001, USA
Chatelain, Joey; Las Cumbres Observatory, CA, USA
Borisov, Galin; Armagh Observatory and Planetarium, College Hill, Armagh BT61 9DG, UK ; Institute of Astronomy and National Astronomical Observatory, Bulgarian Academy of Sciences, 72, Tsarigradsko Chaussèe Blvd., Sofia BG-1784, Bulgaria
Arai, Tomoko; Planetary Exploration Research Center, Chiba Institute of Technology, Narashino, Japan
Fedorets, Grigori; Department of Physics, P.O. Box 64, FI-00014 University of Helsinki, Finland ; Astrophysics Research Centre, School of Mathematics and Physics, Queen's University Belfast, Belfast BT7 1NN, UK
Ferrais, Marin ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Granvik, Mikael; Department of Physics, P.O. Box 64, FI-00014 University of Helsinki, Finland ; Division of Space Technology, Luleå University of Technology, Box 848, SE-98128 Kiruna, Sweden
Jehin, Emmanuel ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Siltala, Lauri; Department of Physics, P.O. Box 64, FI-00014 University of Helsinki, Finland ; Nordic Optical Telescope, Apartado 474, E-38700 S/C de La Palma, Santa Cruz de Tenerife, Spain
Pöntinen, Mikko; Department of Physics, P.O. Box 64, FI-00014 University of Helsinki, Finland
Mommert, Michael; Lowell Observatory, 1400 W. Mars Hill Rd., Flagstaff, AZ 86001, USA
Polishook, David; Faculty of Physics, Weizmann Institute of Science, 234 Herzl St. Rehovot 7610001, Israel
Skiff, Brian; Lowell Observatory, 1400 W. Mars Hill Rd., Flagstaff, AZ 86001, USA
Tanga, Paolo; Université Côte d'Azur, Observatoire de la Côte d'Azur, CNRS, Laboratoire Lagrange, Boulevard de l'Observatoire, CS34229, F-06304 Nice Cedex 4, France
Yoshida, Fumi; Planetary Exploration Research Center, Chiba Institute of Technology, Narashino, Japan)
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