Orbit Uncertainty and Close-Approach Analysis Capabilities of the Horizons On-Line Ephemeris System

Details Orbit Uncertainty and Close-Approach Analysis Capabilities of the Horizons On-Line Ephemeris System Orbit Uncertainty and Close-Approach Analysis Capabilities of the Horizons On-Line Ephemeris System

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001dps....33.5813g&link_type=abstract

American Astronomical Society, DPS Meeting #33, #58.13; Bulletin of the American Astronomical Society, Vol. 33, p.1562

Astronomy and Astrophysics

Astronomy

Scientific paper

The Horizons On-Line Ephemeris System was initially made available in 1996. It has since been used by 450000 people to generate 700000 high-precision solar system ephemerides and database search results relating to the planets, satellites, and a growing list of asteroids, comets and spacecraft. This database is presently in excess of 90000 objects. The system receives about 23000 requests per month via the three automated access methods (telnet, web and e-mail) described at http://ssd.jpl.nasa.gov/horizons.html. Horizons has recently been extended to perform linearized covariance mappings. This allows users to obtain orbital motion uncertainties of those asteroids and comets for which a covariance is available, as a function of time, in multiple coordinate systems such as the plane-of-sky. Also newly available is an on-line close-approach analysis capability. This provides efficient detection of asteroid and comet approaches to planets and the larger asteroids. For asteroids and comets with a computed covariance, approach quantities such as encounter timing uncertainty are computed. This allows convenient assessment of the quality of close-approach knowledge. Detailed Horizons documentation is available at ftp://ssd.jpl.nasa.gov/pub/ssd/Horizons_doc.ps

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