This web site provides data on numbered and multiopposition asteroids, including orbital elements, their uncertainty, proper elements, ephemerides with uncertainty, and more.

The orbits and other information, as posted on the web page of each individual object, is periodically recomputed if new observations are available, with the OrbFit free software.

The following catalogs are updated every month, or anyway whenever the MPC releases a full update of the dataset: osculating orbital elements, analytical proper elements for main belt asteroids, residuals and quality control after the orbital fit. Other catalogs, such as synthetic proper elements, are updated periodically. The last monthly update has been based upon the observations performed until May 04, 2012.

What's new?

• The AstDyS information system has recently changed its web interface. This was necessary to allow upgrade and maintenance of the web interface, because the previous version used propietary software which we could not maintain and which used obsolete libraries. The new interface will gradually diverge from the old one, that is acquire new functionalities. We would appreciate receiving comments on the new interface.
• Note that the current operational AstDyS system is using the Fortran 95 version of the software; thus the format of the observation files has been changed and cannot be read with the Fortran 77 version of the sofware. The format of the orbital elements files has not been changed.

How does it work?

These important buttons and links are at the top and bottom of every page:

Objects

To browse the list of objects in the AstDyS database.

Observatories

To browse the list of observing stations.

Search

To search for a specific object or for objects with particular characteristics.

Orbital elements

Catalogs of Orbital elements

Proper elements

Catalogs of proper elements

Related sites

Links to related WWW sites.

Info & Credits

Information page: about AstDys, frequently asked questions, MJD conversion tables and other infos.

[Help]

Help window.

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This is the Tools icon (on the right in the top banner). Clicking repeatedly on it shows the following tools: Go to asteroid, Current date-time, MJD-calendar conversor and, finally, color and font-size selectors. When all the tools are displayed the icon changes to  ▼ . Clicking on  ▼  hides the tools and sets the icon again to  ▲ .

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Expands the main content area, hiding the banners and menus, to increase the available on-screen surface for data browsing. The same icon lets you restore the initial layout.

Contact »

Send feedback to the AstDyS team.

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