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PROPER ELEMENTS OF BODIES
This page shows the proper elements of the selected asteroid. Proper elements are quasi-integrals of motion, and thus represent the "average" characteristics of motion over very long time spans.
Two sets of elements are provided if available, one computed by means of an analytic theory, and the other computed by means of a purely numerical procedure (the synthetic theory ). The latter set is accompanied with the corresponding uncertainties, as well as with the data to measure the (in)stability of motion (chaos). The analytic proper elements are provided for all the numbered and multiopposition asteroids for which it was possible to compute them in a reliable manner, given the intrinsic constraints of the analytic method itself. Synthetic proper elements are provided for the numbered asteroids between 2.0 and 4.0 au, and only for those with initial perihelion distance > 1.6 au for the objects in the inner part of the maint belt (a < 2.5 au), and larger than 1.75 au for the objects in the outer main belt.Also provided are synthetic proper elements for numbered Hungarias. In addition there are synthetic proper elements for TNOs, both numbered and multiopposition, with semimajor axes between 32 and 100 au, eccentricity < 0.3, inclination < 18 deg, and initial perihelion distance > 32 AU, as well as proper elements for Jupiter Trojans, again for both numbered and multiopposition, computed by means of the semianalytic and synthetic theories.
Apart from the two main tables containing proper elements, we provide auxiliary tables:
- one containing information on stability of motion in terms of the Maximum Lyapounov Characteristic Exponent and the time span covered by the integration;
- the other table contains family membership information, including the status of the asteroid (core member, attributed or ambiguously classified) and the family parent body for the attributed family members there is also information on the nearest core family member and the distance to it in terms of relative velocity metrics;
- if the asteroid is located in one of the mean motion resonances, we provide the corresponding resonance flag.
See FAQ-prop for a brief explanation of the theories, FAQ-propel to learn about the data provided on this page, and FAQ-prop-learn to find out where you can learn more.
Go to the dedicated AstDyS proper elements home page by selecting the corresponding item from the main menu on top of this page. There you can browse and download various catalogs with proper elements for all the asteroids in the database, as well as the software used to compute them.