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Photometry and models of eight near-Earth asteroids |
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| Authors: | Mikko Kaasalainen Petr Pravec Lenka Šarounová Jenni Virtanen Anders Erikson Josef ?urech Johan SV Lagerros Claes-Ingvar Lagerkvist John Davies Peter Kušnirák Vasilij G Shevchenko Irina N Belskaya |
| Institution: | a Observatory, University of Helsinki, P.O. Box 14, FIN-00014 Helsinki, Finland b Rolf Nevanlinna Institute, P.O. Box 4, FIN-00014 Helsinki, Finland c Astronomical Institute AS CR, CZ-25165 Ond?ejov, Czech Republic d Institute of Astronomy of Kharkiv National University, Sumska street 35, 61022 Kharkiv, Ukraine e Department of Remote Sensing and Photogrammetry, Finnish Geodetic Institute, Geodeetinrinne 2, P.O. Box 15, FIN-02431 Masala, Finland f DLR, German Aerospace Center, Rutherfordstrasse 2, D-12489 Berlin, Germany g Max-Planck-Institut für Aeronomie, D-37191 Katlenburg-Lindau, Germany h Astronomical Institute, Charles University Prague, CZ-18000 Praha, Czech Republic i Astronomical Observatory, Box 515, 75120 Uppsala, Sweden j Antelope Hills Observatory, 980 Antelope Drive West, Bennett, CO 80102, USA k Astronomy Technology Centre, Blackford Hill, Edinburgh, EH9 3HJ, Scotland, UK l Department of Physics, University of Victoria, Victoria, BC, Canada m Crimean Astrophysical Observatory, 98680 Simeiz, Ukraine |
| Abstract: | We present new observations and models of the shapes and rotational states of the eight near-Earth Asteroids (1580) Betulia, (1627) Ivar, (1980) Tezcatlipoca, (2100) Ra-Shalom, (3199) Nefertiti, (3908) Nyx, (4957) Brucemurray, and (5587) 1990 SB. We also outline some of their solar phase curves, corrected to common reference geometry with the models. Some of the targets may feature sizable global nonconvexities, but the observable solar phase angles were not sufficiently high for confirming these. None is likely to have a very densely cratered surface. We discuss the role of the intermediate topographic scale range in photometry, and surmise that this scale range is less important than large or small scale lengths. |
| Keywords: | Asteroids rotation Photometry Surfaces asteroids |
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