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This set of models is often referred to collectively as SGP4 due to the frequency of use of that model particularly with two-line element sets produced by NORAD and NASA. These models predict the effect of perturbations caused by the Earth’s shape, drag, radiation, and gravitation effects from other bodies such as the sun and moon.
The differences between the three models were slight for most objects. One year later, Spacetrack Report #3 was released, included full FORTRAN source code for the SGP4 model. [9] This quickly became the de facto standard model, both in the industry as well as the astronomy field.
BSTAR is a way of modeling aerodynamic drag on a satellite in the simplified general perturbation model 4 satellite orbit propagation model. [1]Traditionally, aerodynamic resistance ("drag") is given by
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3DModels, a collection of vehicle 3D models; 3DBar, a collection of free 3D models; NASA 3D Models, NASA 3D models to use for educational or informational purposes; VRML Models from ORC Incorporated, 3D models in VRML format; 3dRender.com: Lighting Challenges, regularly held lighting challenges, complete with scene and models for each challenge
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