Planet orbital location database

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Discussion Overview

The discussion revolves around the search for a database that provides the current positions and velocities of planets in space, aimed at testing a Java program simulating gravitational interactions in three-dimensional space. Participants explore the implications of using such data for accurate simulations of planetary motion.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant seeks a free database for current orbital velocities and coordinates of all planets to enhance their gravity simulation program.
  • Another participant suspects that the sun's movement affects the simulation, suggesting that minimizing the sun's movement could help eliminate unintended effects like the slingshot effect.
  • A participant points to NASA JPL as a source for the desired database but questions the correctness of the initial conditions and equations used in the simulation.
  • One participant acknowledges a mistake in their calculations regarding the acceleration due to gravity, which they believe affected the simulation results.
  • Another participant shares specific solar system data obtained from the JPL Horizons database, detailing positions and velocities of various celestial bodies as of a specific date.
  • A participant elaborates on the interaction between the Earth and the sun, noting that the Earth exerts a pull on the sun, which is influenced by the Earth's initial orbital position.
  • Further clarification is provided regarding the expected motion of the sun in response to the Earth's gravitational influence, emphasizing the characteristics of its motion.

Areas of Agreement / Disagreement

Participants express varying views on the impact of the sun's movement and the correctness of the simulation setup. There is no consensus on the best approach to resolve the issues raised, and multiple perspectives on the gravitational interactions remain present.

Contextual Notes

Participants mention potential limitations in their simulations, including the accuracy of initial conditions and the equations used to model gravitational interactions. The discussion highlights the complexity of simulating multi-body gravitational systems.

Who May Find This Useful

This discussion may be of interest to individuals involved in programming simulations of celestial mechanics, those seeking data for astrophysical research, or anyone exploring the dynamics of planetary motion in a multi-body system.

krsbuilt
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I wrote a program in java to simulate gravity in 3 dimensional space between any number of objects, and i wanted to test if it works. i managed to find the data for the Earth and the sun and tried those out and the sun acted as a slingshot for the earth. i would like to know if i could find some sort of database containing the current position in space for all the planets at any particular time, so that i may plug those into my simulator and try to get out a decant simulation. does anyone know of a database that is free to use that would get me the current orbital velocities and coordinates of all the planets?
 
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ah, yes. i should probably mention that my suspected reason for the Earth not rotating properly is that the sun is not a fixed body, i noticed that the sun is actually moving towards the earth. so i need the rest of the system to minimize the suns movement, therefore hopefully removing the slingshot effect.
 
Nasa JPL maintains just such a database, see: http://ssd.jpl.nasa.gov/?ephemerides.

Including the other planets won't fix your problem however. There is something wrong with your equations or initial conditions--are you sure you included the proper initial velocities?
 
ok, i figured it out. i kept on adding to the acceleration due to gravity to the previously calculated acceleration. rookie mistake. the database will be useful still. anyways, I'm not sure about with all the other planets, but with just the Earth orbiting the sun, the Earth actually pulls the sun. the direction it pulls is determined by where the Earth started its orbit. it's interesting actually.
 
Zhermes gave you the best answer. Use JPL Horizons. Here's some solar system data for a simulation I made. I got this data from Horizons. Everything is given relative to the Sun, so the Sun's position is 0,0,0 and its velocity is 0,0,0. The first 3 numbers for each object are position: x,y,z. The last 3 numbers for each object are velocity: x,y,z. These numbers are for May 29, 2011 at 00:00:01.
Code: 
2011 05 29   00 00 01	Sun	0	0	0	0	0	0		Mercury	53415407007	-3258938251	-5167464455	-6446.040768	50804.60764	4742.469441		Venus	1.04688E+11	28059179722	-5657450542	-9189.841943	33670.99928	991.6719595		Earth	-58865713781	-1.39717E+11	3639009.381	26971.8094	-11689.08266	0.816775593		Mars	1.91314E+11	93944499293	-2729265145	-9753.30586	23819.54731	738.605914		Jupiter Barycenter	6.90637E+11	2.66618E+11	-16562275828	-4869.216238	12821.93657	55.72581332		Saturn Barycenter	-1.38668E+12	-3.85124E+11	61902274937	2060.483788	-9318.279905	80.17792789		Uranus Barycenter	3.00382E+12	58703701573	-38692419910	-186.6851099	6501.31934	26.5613355		Neptune Barycenter	3.8412E+12	-2.32328E+12	-40667374961	2773.352923	4692.851413	-160.3628824		Moon	-58496211597	-1.39558E+11	35681113.77	26572.65663	-10802.40349	-45.08250411		1 Ceres	3.90097E+11	-2.02397E+11	-78200297604	7465.522727	14741.43173	-915.5766609		10 Hygiea	-2.33765E+11	-3.42164E+11	-20595370850	15581.16114	-10660.42018	851.3753685		16 Psyche	-1.72758E+11	3.99025E+11	-14132409418	-16859.4099	-4653.379158	671.1802206		2 Pallas	1.98797E+11	-3.91685E+11	2.54128E+11	13374.70534	3442.137112	-3492.811903		3 Juno	-4.40076E+11	-43364871018	27613130497	-2032.371106	-15791.11996	3666.075452		4 Vesta	1.20474E+11	-3.04625E+11	-5475194949	19582.77003	6655.997887	-2579.539478
 
krsbuilt said:
ok, i figured it out. i kept on adding to the acceleration due to gravity to the previously calculated acceleration. rookie mistake. the database will be useful still. anyways, I'm not sure about with all the other planets, but with just the Earth orbiting the sun, the Earth actually pulls the sun. the direction it pulls is determined by where the Earth started its orbit. it's interesting actually.

The motion of the sun should be 1) barely noticeable (displacement relative to the semi-major axis should be about the same as Earth's mass relative to the reduced mass), 2) elliptical 3) always opposite the COM from the earth, and with a velocity opposite in direction, and with a magnitude such that the total momentum in the COM is always zero.
 

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