author = "Boldrin, Luiz A. G. and Ara{\'u}jo, Rosana Aparecida Nogueira de 
                         and Winter, Othon C.",
          affiliation = "{Universidade Estadual Paulista (UNESP)} and {Instituto Nacional 
                         de Pesquisas Espaciais (INPE)} and {Universidade Estadual Paulista 
                title = "On the rotational motion of NEAs during close encounters with the 
              journal = "European Physical Journal Special Topics",
                 year = "2020",
               volume = "229",
               number = "8",
                pages = "1391--1403",
                month = "May",
             abstract = "During their lifetime, the Near-Earth Asteroids (NEAs) suffer 
                         numerous close encounters (CE) with Earth, Mars and Venus. It has 
                         been demonstrated that gravitational interactions during close 
                         planetary encounters can alter an asteroid's spin state, and 
                         hence, along with collisions, play a role in the rotational 
                         evolution of NEAs. The variation of the rotational angular 
                         momentum during the encounters can increase or decrease the 
                         rotation rate depending on the initial condition. In addition to 
                         the rotation rate, close encounters cause variation in the 
                         movement of precession and nutation of the asteroid. Using a 
                         numerical model that takes into account the spin-orbit coupling of 
                         a body with ellipsoidal shape, the subject of this study is to 
                         analyze the rotational motion (rotation, precession and nutation) 
                         of asteroids during CE with the Earth for different initial 
                         conditions. We computed the variation of the obliquity and the 
                         variation of spin period after the CE. We found significant change 
                         in obliquity and spin period only in cases with strong encounter, 
                         that is in cases that the impact parameter of the encounter (1.2 
                         <= d <= 7 (Earth radii) and the relative velocity (v) are small. 
                         Our results also show that the variation of rotational motion due 
                         to the close encounter is capable of tumbling the axis of rotation 
                         and gravitational rupture may occur in a few cases.",
                  doi = "10.1140/epjst/e2020-900200-5",
                  url = "http://dx.doi.org/10.1140/epjst/e2020-900200-5",
                 issn = "1951-6355",
             language = "en",
           targetfile = "BOLDRIN-2020.pdf",
        urlaccessdate = "21 abr. 2021"