Where Can I Find a Barycentric Solar System Ephemeris?

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Discussion Overview

The discussion revolves around finding an accurate ephemeris for the solar system that provides state vectors (position and velocity) in a barycentric coordinate system. The focus is on locating a suitable online resource for this purpose.

Discussion Character

  • Technical explanation, Debate/contested, Experimental/applied

Main Points Raised

  • One participant inquires about a website that offers barycentric solar system ephemeris data.
  • Another participant suggests the JPL Horizons website as a potential resource for obtaining the required data.
  • A subsequent reply expresses satisfaction with the suggested site, indicating it meets their needs.
  • One participant notes the difference between barycentric and heliocentric observer locations, mentioning a preference for heliocentric but acknowledging the utility of barycentric for specific calculations.
  • A final reply emphasizes the need for barycentric data due to the participant's calculations involving angular momentum, highlighting concerns about the sun's wobbling affecting results.

Areas of Agreement / Disagreement

Participants generally agree on the utility of the JPL Horizons website for obtaining ephemeris data, but there is a difference in preference between barycentric and heliocentric coordinate systems based on individual needs.

Contextual Notes

Participants express varying requirements for the coordinate system based on specific calculations, indicating that the choice between barycentric and heliocentric may depend on the context of the analysis.

Who May Find This Useful

This discussion may be useful for individuals interested in astrophysics, orbital mechanics, or those needing precise solar system data for calculations involving angular momentum or other dynamics.

Dale
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Does anyone know of a website with an accurate ephemeris where you can plug in a time and get the state vectors (position and velocity) for the sun and all of the planets in a barycentric coordinate system?
 
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Thanks, this seems to be just about perfect!
 
For observer location, use @0 for barycentric or @010 for heliocentric.
There won't be a huge difference between the two.
I find heliocentric more useful.
 
Thanks for the tip. I need barycentric because I am calculating angular momentum and I don't want to have to adjust things for the wobbling of the sun.
 

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