Asteroid candidates for mass determination

摘要: The rst 9511 numbered asteroids are studied in terms of their mutual closest approaches and encounter velocities during the period from November 6, 1967, to September 13, 2023. Several large (diameter 200 km above) were (will be) encountered by smaller counterparts within a distance 0:0200 AU. Thus, they possible candidates for mass determination astrometrical method. Similarly, search eective perturbers is extended even much closer separation 0:0020 AU below. Only simplied method evaluation observable eects on perturbed body used. Asteroid masses alone not computed here. But stronger criterion reveal pairs this purpose comparison some specially devoted papers should compensate dierence act as reliable test. best at present (1), (2), (4), (10), (11), (24), (52) (65). This list may be least (29) next 5 years many others two decades. other strong last three decades included list, while there still only limited number (or no) precise observations before close encounter. It seems that perturbation (10) (2) could asteroid orbit future. Except bulk density determinations (knowing size), occasionally used improve precision large-numbered unnumbered well.