@Article{CamargoMVABDBGAS:2015:18YeOb,
               author = "Camargo, J. I. B. and Magalh{\~a}es, Fab{\'{\i}}ola Pinho and 
                         Vieira-Martins, R. and Assafin, M. and Braga-Ribas, F. and 
                         Dias-Oliveira, A. and Benedetti-Rossi, G. and Gomes-J{\'u}nior, 
                         A. R. and Andrei, A. H. and Silva Neto, D. N.",
          affiliation = "{Observat{\'o}rio Nacional (ON)} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)} and {Observat{\'o}rio Nacional (ON)} 
                         and {Observat{\'o}rio Do Valongo} and {Observat{\'o}rio Nacional 
                         (ON)} and {Observat{\'o}rio Nacional (ON)} and {Observat{\'o}rio 
                         Nacional (ON)} and {Observat{\'o}rio Do Valongo} and 
                         {Observat{\'o}rio Nacional (ON)} and {Centro Universit{\'a}rio 
                         Estadual da Zona Oeste}",
                title = "Astrometry of the main satellites of Uranus: 18 years of 
                         observations",
              journal = "Astronomy \& Astrophysics",
                 year = "2015",
               volume = "582",
                pages = "A8",
                month = "Oct.",
             keywords = "Astrometry, Catalogs, Methods: data analysis, Planets and 
                         satellites: individual: Uranus.",
             abstract = "Context. We contribute to developing dynamical models of the 
                         motions of Uranus' main satellites. Aims. We determine accurate 
                         positions of the main satellites of Uranus: Miranda, Ariel, 
                         Umbriel, Titania, and Oberon. Positions of Uranus, as derived from 
                         those of these satellites, are also determined. The observational 
                         period spans from 1992 to 2011. All runs were made at the Pico dos 
                         Dias Observatory, Brazil. Methods. We used the software called 
                         Platform for Reduction of Astronomical Images Automatically 
                         (PRAIA) to perform a digital coronography to minimise the 
                         influence of the scattered light of Uranus on the astrometric 
                         measurements and to determine accurate positions of the main 
                         satellites. The positions of Uranus were then indirectly 
                         determined by computing the mean differences between the observed 
                         and ephemeris positions of these satellites. A series of numerical 
                         filters was applied to filter out spurious data. These filters are 
                         mostly based on (a) the comparison between the positions of Oberon 
                         with those of the other satellites and on (b) the offsets as given 
                         by the differences between the observed and ephemeris positions of 
                         all satellites. Results. We have, for the overall offsets of the 
                         five satellites,-29 mas (±63 mas) in right ascension and-27 mas 
                         (±46 mas) in declination. For the overall difference between the 
                         offsets of Oberon and those of the other satellites, we have +3 
                         mas (±30 mas) in right ascension and-2 mas (±28 mas) in 
                         declination. Ephemeris positions for the satellites were 
                         determined from DE432+ura111. Comparisons using other modern 
                         ephemerides for the solar system-INPOP13c-and for the motion of 
                         the satellites-NOE-7-2013-were also made. They confirm that the 
                         largest contribution to the offsets we find comes from the motion 
                         of the barycenter of the Uranus system around the barycenter of 
                         the solar system, as given by the planetary ephemerides. For the 
                         period from 1992 to 2011, our final catalogues contain 584 
                         observed positions of Miranda, 1710 of Ariel, 1987 of Umbriel, 
                         2588 of Titania, 2928 of Oberon, and 3516 of Uranus.",
                  doi = "10.1051/0004-6361/201526385",
                  url = "http://dx.doi.org/10.1051/0004-6361/201526385",
                 issn = "0004-6361 and 1432-0746",
             language = "en",
           targetfile = "2015_camargo.pdf",
        urlaccessdate = "27 abr. 2024"
}