The EURONEAR Lightcurve Survey of Near Earth Asteroids |
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| Authors: | O. Vaduvescu A. Aznar Macias V. Tudor M. Predatu A. Galád Š. Gajdoš J. Világi H. F. Stevance R. Errmann E. Unda-Sanzana F. Char N. Peixinho M. Popescu A. Sonka R. Cornea O. Suciu R. Toma P. Santos-Sanz A. Sota J. Licandro M. Serra-Ricart D. Morate T. Mocnik M. Diaz Alfaro F. Lopez-Martinez J. McCormac N. Humphries |
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| Affiliation: | 1.Isaac Newton Group of Telescopes (ING),Santa Cruz de la Palma,Spain;2.Instituto de Astrofísica de Canarias (IAC),La Laguna,Spain;3.Departamento de Astrofísica,Universidad de La Laguna,La Laguna,Spain;4.Isaac Aznar Observatory,Aras de los Olmos, Valencia,Spain;5.Faculty of Sciences,University of Craiova,Craiova,Romania;6.Modra Observatory, Department of Astronomy, Physics of the Earth and Meteorology,FMPI UK,Bratislava,Slovakia;7.Department of Physics and Astronomy,University of Sheffield,Sheffield,UK;8.Unidad de Astronomía, Facultad Ciencias Básicas,Universidad de Antofagasta,Antofagasta,Chile;9.CITEUC - Centre for Earth and Space Science Research of the University of Coimbra,Observatório Geofísico e Astronómico da Universidade de Coimbra,Coimbra,Portugal;10.Astronomical Institute of the Romanian Academy,Bucharest,Romania;11.IMCCE, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Univ Paris 06, Univ. Lille,Paris,France;12.Romanian Society for Meteors and Astronomy (SARM),Targoviste,Romania;13.Armagh Observatory and Planetarium, College Hill,Armagh,Northern Ireland;14.Instituto de Astrofísica de Andalucía, IAA-CSIC,Granada,Spain;15.Astrophysics Group,Keele University,Staffordshire,UK;16.National Solar Observatory,Sunspot,USA;17.Instituto de Astrofísica e Ciências do Espa?o,Universidade do Porto, CAUP,Porto,Portugal |
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| Abstract: | This data paper presents lightcurves of 101 near Earth asteroids (NEAs) observed mostly between 2014 and 2017 as part of the EURONEAR photometric survey using 11 telescopes with diameters between 0.4 and 4.2 m located in Spain, Chile, Slovakia and Romania. Most targets had no published data at the time of observing, but some objects were observed in the same period mainly by B. Warner, allowing us to confirm or improve the existing results. To plan the runs and select the targets, we developed the public Long Planning tool in PHP. For preliminary data reduction and rapid follow-up planning we developed the LiDAS pipeline in Python and IRAF. For final data reduction, flux calibration, night linkage and Fourier fitting, we used mainly MPO Canopus. Periods of 18 targets are presented for the first time, and we could solve or constrain rotation for 16 of them. We secured periods for 45 targets ((Usim 3)), found candidate periods for other 16 targets ((Usim 2)), and we propose tentative periods for other 32 targets ((Usim 1)). We observed 7 known or candidate binary NEAs, fiting 3 of them (2102 Tantalus, 5143 Heracles and 68348). We observed 8 known or candidate tumbling NEAs, deriving primary periods for 3 objects (9400, 242708 and 470510). We evidenced rapid oscillations (few minutes) and could fit fast tentative periods TP2 for 5 large newly suggested tumbling or binary candidates (27346, 112985, 285625, 377732, 408980), probably discovering at least one new binary NEA (2011 WO41). We resolved periods of 4 special objects which include two proposed space mission targets (163249 and 101955 Bennu), one very fast rotator NEA discovered by EURONEAR (2014 NL52) and the “Halloween asteroid” (2015 TB145). Using Mercator in simultaneous 3 band MAIA imaging, we could evidence for the first time clear variation in the color lightcurves of 10 NEAs. The periods derived from the g–r color lightcurves are found to match individual band period fits for 4 NEAs (27346, 86067, 112985 and 275976). |
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