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• Simplified_perturbations_models abstract "Simplified perturbations models are a set of five mathematical models (SGP, SGP4, SDP4, SGP8 and SDP8) used to calculate orbital state vectors of satellites and space debris relative to the Earth-centered inertial coordinate system. 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. Simplified General Perturbations (SGP) models apply to near earth objects with an orbital period of less than 225 minutes. Simplified Deep Space Perturbations (SDP) models apply to objects with an orbital period greater than 225 minutes, which corresponds to an altitude of 5,877.5 km, assuming a circular orbit.The SGP4 and SDP4 models were published along with sample code in FORTRAN IV in 1988 with refinements over the original model to handle the larger number of objects in orbit since. SGP8/SDP8 introduced additional improvements for handling orbital decay.The SGP4 model has an error ~1 km at epoch and grows at ~1–3 km per day. This data is updated frequently in NASA and NORAD sources due to this error. The original SGP model was developed by Kozai in 1959, refined by Hilton & Kuhlman in 1966 and was originally used by the National Space Surveillance Control Center (and later the United States Space Surveillance Network) for tracking of objects in orbit. The SDP4 model has an error of 10 km at epoch.Deep space models SDP4 and SDP8 use only 'simplified drag' equations. Accuracy is not a great concern here as high drag satellite cases do not remain in "deep space" for very long as the orbit quickly becomes lower and near circular. SDP4 also adds Lunar–Solar gravity perturbations to all orbits, and Earth resonance terms specifically for 24-hour geostationary and 12-hour Molniya orbits.Additional revisions of the model were developed and published by the Goddard Space Flight Center in support of tracking of the SeaWiFS mission and the Navigation and Ancillary Information Facility at the Jet Propulsion Laboratory in support of Planetary Data System for navigational purposes of numerous, mostly deep space, missions. Current code libraries have merged SGP4 and SDP4 algorithms into a single codebase handling the range of orbital periods which are usually referred to generically as SGP4.".
• Simplified_perturbations_models wikiPageExternalLink predict4java.
• Simplified_perturbations_models wikiPageExternalLink Predict.
• Simplified_perturbations_models wikiPageExternalLink gpredict.oz9aec.net.
• Simplified_perturbations_models wikiPageExternalLink AIAA-2006-6753Code.zip.
• Simplified_perturbations_models wikiPageExternalLink ReadMe.html.
• Simplified_perturbations_models wikiPageExternalLink python-sgp4.
• Simplified_perturbations_models wikiPageID "2931010".
• Simplified_perturbations_models wikiPageLength "4639".
• Simplified_perturbations_models wikiPageOutDegree "22".
• Simplified_perturbations_models wikiPageRevisionID "682404369".
• Simplified_perturbations_models wikiPageWikiLink Category:Computational_physics.
• Simplified_perturbations_models wikiPageWikiLink Category:North_American_Aerospace_Defense_Command.
• Simplified_perturbations_models wikiPageWikiLink Category:Orbital_perturbations.
• Simplified_perturbations_models wikiPageWikiLink Earth-centered_inertial.
• Simplified_perturbations_models wikiPageWikiLink Epoch_(astronomy).
• Simplified_perturbations_models wikiPageWikiLink FORTRAN_IV.
• Simplified_perturbations_models wikiPageWikiLink Fortran.
• Simplified_perturbations_models wikiPageWikiLink Geostationary.
• Simplified_perturbations_models wikiPageWikiLink Geostationary_orbit.
• Simplified_perturbations_models wikiPageWikiLink Goddard_Space_Flight_Center.
• Simplified_perturbations_models wikiPageWikiLink Jet_Propulsion_Laboratory.
• Simplified_perturbations_models wikiPageWikiLink Molniya_orbit.
• Simplified_perturbations_models wikiPageWikiLink NASA.
• Simplified_perturbations_models wikiPageWikiLink NORAD.
• Simplified_perturbations_models wikiPageWikiLink Navigation_and_Ancillary_Information_Facility.
• Simplified_perturbations_models wikiPageWikiLink North_American_Aerospace_Defense_Command.
• Simplified_perturbations_models wikiPageWikiLink Orbital_decay.
• Simplified_perturbations_models wikiPageWikiLink Orbital_period.
• Simplified_perturbations_models wikiPageWikiLink Orbital_state_vectors.
• Simplified_perturbations_models wikiPageWikiLink Perturbation_(astronomy).
• Simplified_perturbations_models wikiPageWikiLink Satellite.
• Simplified_perturbations_models wikiPageWikiLink Satellites.
• Simplified_perturbations_models wikiPageWikiLink SeaWiFS.
• Simplified_perturbations_models wikiPageWikiLink Space_debris.
• Simplified_perturbations_models wikiPageWikiLink Two-line_element_set.
• Simplified_perturbations_models wikiPageWikiLink United_States_Space_Surveillance_Network.
• Simplified_perturbations_models wikiPageWikiLinkText "Simplified perturbations models".
• Simplified_perturbations_models wikiPageWikiLinkText "simplified perturbations models".
• Simplified_perturbations_models hasPhotoCollection Simplified_perturbations_models.
• Simplified_perturbations_models wikiPageUsesTemplate Template:Reflist.
• Simplified_perturbations_models subject Category:Computational_physics.
• Simplified_perturbations_models subject Category:North_American_Aerospace_Defense_Command.
• Simplified_perturbations_models subject Category:Orbital_perturbations.
• Simplified_perturbations_models hypernym Set.
• Simplified_perturbations_models type Algorithm.
• Simplified_perturbations_models type Physic.
• Simplified_perturbations_models type Unit.
• Simplified_perturbations_models comment "Simplified perturbations models are a set of five mathematical models (SGP, SGP4, SDP4, SGP8 and SDP8) used to calculate orbital state vectors of satellites and space debris relative to the Earth-centered inertial coordinate system.".
• Simplified_perturbations_models label "Simplified perturbations models".
• Simplified_perturbations_models sameAs SGP4.
• Simplified_perturbations_models sameAs m.08dfd4.
• Simplified_perturbations_models sameAs Q7520952.
• Simplified_perturbations_models sameAs Q7520952.
• Simplified_perturbations_models wasDerivedFrom Simplified_perturbations_models?oldid=682404369.
• Simplified_perturbations_models isPrimaryTopicOf Simplified_perturbations_models.