Asteroid candidates for mass determination

Authors
Citation
A. Galad, Asteroid candidates for mass determination, ASTRON ASTR, 370(1), 2001, pp. 311-319
Citations number
13
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Space Sciences
Journal title
ASTRONOMY AND ASTROPHYSICS
ISSN journal
0004-6361 → ACNP
Volume
370
Issue
1
Year of publication
2001
Pages
311 - 319
Database
ISI
SICI code
0004-6361(200104)370:1<311:ACFMD>2.0.ZU;2-W
Abstract
The first 9511 numbered asteroids are studied in terms of their mutual clos est approaches and encounter velocities during the period from November 6, 1967, to September 13, 2023. Several large asteroids (diameter 200 km and a bove) were (will be) encountered by smaller counterparts within a distance of 0.0200 AU. Thus, they are possible candidates for mass determination by the astrometrical method. Similarly, the search for effective perturbers is extended to even smaller asteroids for the much closer separation distance of 0.0020 AU and below. Only the simplified method for evaluation of obser vable effects on a perturbed body is used. Asteroid masses alone are not co mputed here. But a stranger criterion to reveal pairs for this purpose in c omparison to some specially devoted papers should compensate for the differ ence and act as a reliable test. The best candidates for mass determination at present are asteroids (1), (2), (4), (10), (11), (24), (52) and (65). T his list may be extended by at least (29) in the next 5 years and by many o thers in the next two decades. Several other strong perturbers from the las t three decades are not included in the list, while there is still only a l imited number of (or no) precise and reliable observations of perturbed ast eroids before a close encounter. It seems that a perturbation by (10) is at least as effective as that by (2) and could be included in asteroid orbit determination in the future. Except for their bulk density determinations ( knowing the size), the masses of perturbers could occasionally be used to i mprove the. precision of the computed orbit for perturbed large-numbered an d unnumbered asteroids as well.