Browsing by Author "Jopek, Tadeusz"
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Item ALPL-1 Newtonian Ephemeris of the Planetary System Spanning 4000 years(Acta Astronomica, 1986) Dybczyński, P. A.; Jopek, TadeuszNumerical integration of the equations of motion of the Solar System Planets (except Mercury) is described. The continuous ephemeris obtained in result, spanning the time interval from 1918 BC to 2092 AD is presented.Item Separation of meteor streams from the sporadic background(Kluwer Academic Publishers, 1995-01) Jopek, TadeuszA cluster analysis procedure has been used to estimate the fraction of the sporadic interlopers (sporadis bias) identified as stream members among the observed meteor orbits. Using the artificial meteor orbits with the same distribution as the observed one, the sporadic bias is estimated for the given threshold value of the orbital similarityD c. It has been shown that in case of the radio meteor catalogues theD c values given by the formula proposed in Southworth and Hawkins (1963)and in Lindblad (1971) correspond to the sporadic bias of 8 21%. For the five radio meteor catalogues the values ofD c corresponding to the fixed bias equal to 10% and 15% are given.Item The Near Earth Asteroid associations(IAU Publisher: Cambridge Universtity Press, 2018-09) Jopek, TadeuszWe searched for associations (not for families) amongst the near Earth asteroids (NEAs) and, similarly as in our previous study (Jopek 2011, Jopek 2012), a dozen groups of 10 or more members was found with high statistical reliability. We present some details of our most numerous finding, association Anza ’2061’ which, at the moment, incorporates 191 members.