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Orbital uncertainties in the JPL Small-Body Database are listed at the 1-sigma level. |
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|publisher=[[NASA]]/[[Jet Propulsion Laboratory|JPL]]
|access-date=2012-03-19
|archive-url=https://web.archive.org/web/20210922230327/http://ssd.jpl.nasa.gov/sbdb.cgi |archivedate=2021-09-22 |url-status=live}}</ref> In April 2021 the JPL Small-Body Database started using planetary [[ephemeris]] ([[Jet Propulsion Laboratory Development Ephemeris#Ephemerides in the series|DE441]]) and small-body perturber SB441-N16. Most objects such as asteroids get a [[Osculating orbit|two-body solution]] (Sun+object) recomputed twice a year. Comets generally have their two-body orbits computed at a time near the perihelion passage (closest approach to the Sun) as to have the two-body orbit more reasonably accurate for both before and after perihelion. For most asteroids, the [[Epoch (astronomy)|epoch]] used to define an orbit is updated twice a year. Orbital uncertainties in the JPL Small-Body Database are listed at the [[68–95–99.7 rule|1-sigma]] level.
On 27 September 2021 the JPL Solar System Dynamics website underwent a significant upgrade.
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