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Determining orbit trajectories
Am most interested in the methods JPL uses to calculate orbits of NEOs and how frequently
the data used to calculate the orbits is updated for close approach objects. Specifically: 1. Are JPL's algorithms proprietary or published? 2. If published - where can they be accessed? 3. What is the type and source of the data used in orbit determination? Thanks in advance for responses / comments. Regards, Doug |
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Determining orbit trajectories
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Determining orbit trajectories
In article ,
Doug Hortvet writes: 1. Are JPL's algorithms proprietary or published? The underlying theory is general relativity, which is widely published. I'd expect many of the numerical methods to be published as well, but I don't know for a fact that they are. Actual computer codes are probably being tweaked all the time, and I wouldn't expect them to be published, but you could try a FOIA request. An informal request to a JPL contact might be simpler and quicker. 2. If published - where can they be accessed? Results -- ephemerides and such -- are available at http://ssd.jpl.nasa.gov/?horizons I expected to find more information about methods than I did, but maybe I didn't search well enough. 3. What is the type and source of the data used in orbit determination? Depends on the object, but in general I'd expect JPL to use all available data. There are several telescopes dedicated to finding and tracking solar system objects, and there's an IAU Minor Planet Center charged with compiling asteroid and comet observations. -- Help keep our newsgroup healthy; please don't feed the trolls. Steve Willner Phone 617-495-7123 Cambridge, MA 02138 USA |
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