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Similar standardsGB/T 43223-2023: Space objects orbital data specification---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT43223-2023GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 49.140 CCS V 70 Space objects orbital data specification ISSUED ON: SEPTEMBER 07, 2023 IMPLEMENTED ON: JANUARY 01, 2024 Issued by: State Administration for Market Regulation; Standardization Administration of the People’s Republic of China. Table of ContentsForeword ... 3 1 Scope ... 4 2 Normative references ... 4 3 Terms and definitions ... 4 4 Abbreviated terms ... 5 5 Artificial space objects orbital data specification ... 5 5.1 General ... 5 5.2 Space-time reference system ... 5 5.3 Data content and writing format ... 6 6 Near earth asteroid orbital data specification ... 10 6.1 General ... 10 6.2 Space-time reference system ... 11 6.3 Data format ... 11 Appendix A (Informative) Method for converting orbital data of space objects orbiting the Earth into standard data recommended by CCSDS ... 13 Bibliography ... 14 Space objects orbital data specification1 ScopeThis document specifies the elements, format and description of orbital data of space objects. This document applies to the characterization of orbital data of artificial space objects such as spacecraft, launch vehicles, space debris orbiting the Earth, and of natural space objects such as near earth asteroids orbiting the Sun. The characterization of orbital data of other spacecraft orbiting a celestial body in the solar system can also refer to this document.2 Normative referencesThe following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 7408, Data elements and interchange formats - Information interchange - Representation of dates and times GB/T 29079, Classification and parameter symbols for orbits and trajectories of spacecraft GB/T 32296, General coordinates for space vehicle GB/T 34513, Space debris mitigation requirements3 Terms and definitionsFor the purpose of this document, the following terms and definitions, as well as those given in GB/T 7408, GB/T 29079 and GB/T 34513 apply. 3.1 astronomical unit; AU A unit of length for measuring distances within the solar system, equal to the average distance between the Sun and the Earth, with a specific value of 149 597 870.7 km. 3.2 near earth asteroid; NEA Asteroids orbiting the Sun in the solar system, whose perihelion is within 1.3 astronomical units of the heliocenter.4 Abbreviated termsFor the purposes of this document, the following abbreviated terms apply. CCSDS: Consultative Committee for Space Data Systems GCRS: Geocentric Celestial Reference System IAU: International Astronomical Union ICRS: International Celestial Reference System MPC: Minor Planet Center OEM: Orbit Element Message OMM: Orbit Mean-element Message OPM: Orbit Parameter Message UTC: Coordinated Universal Time5 Artificial space objects orbital data specification5.1 General The artificial space objects orbital data is used to describe the state parameters of the orbit of the corresponding artificial space objects around a certain central celestial body, usually including orbital data and related dynamic parameters. 5.2 Space-time reference system The time reference system uses UTC; the space reference system is defined according to GB/T 32296 and is based on ICRS: the coordinate origin is the center of mass of the central gravitational body, and the coordinate plane and coordinate axis point in the same direction as ICRS. Note: Taking an artificial space object orbiting the Earth as an example, the corresponding coordinate system is GCRS. For the calculation of parameters such as precession and nutation related to the coordinate system, it is recommended to use the IAU1980 and newer models.Appendix A(Informative) Method for converting orbital data of space objects orbiting the Earth into standard data recommended by CCSDS A.1 General CCSDS provides three recommended orbital data standards: OEM, OPM, and OMM. The conversion methods between the orbital data format specified in this document and the OEM and OPM data formats are shown in A.2 and A.3 respectively. A.2 Conversion with OPM In OPM, EME2000 is used to represent the celestial coordinate system of the J2000.0 epoch. The orbital elements can be directly obtained by coordinate transformation using the data in this document. The difference is that in OPM, atmospheric drag and solar radiation pressure are represented by the drag coefficient/radiation pressure coefficient and the effective area, respectively, but the effective area can be calculated by giving the mass of the object and the drag coefficient. OPM data is usually for spacecraft that are effectively operating on orbit, so there is a reference value for mass. A.3 Conversion with OEM OEM is the orbital ephemeris information. The user of this document only needs to convert the six Kepler orbit elements into position and velocity vectors in the corresponding coordinate system or directly use the ephemeris data. In addition, this document provides covariance data as optional data, and its format is consistent with OEM. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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