Space data and information transfer systems — Orbit data messages

This document specifies four standard message formats for use in transferring spacecraft orbit information between space agencies and commercial or governmental spacecraft operators: The Orbit Parameter Message (OPM), the Orbit Mean-Elements Message (OMM), the Orbit Ephemeris Message (OEM), and the Orbit Comprehensive Message (OCM). Such exchanges are used for: a) pre-flight planning for tracking or navigation support; b) scheduling tracking support; c) carrying out tracking operations (sometimes called metric predicts); d) performing orbit comparisons; e) carrying out navigation operations such as orbit propagation and orbit reconstruction; f) assessing mutual physical and electromagnetic interference among satellites orbiting the same celestial body (primarily Earth, Moon, and Mars at present); g) performing orbit conjunction (collision avoidance) studies; and h) developing and executing collaborative maneuvers to mitigate interference or enhance mutual operations. This document includes sets of requirements and criteria that the message formats have been designed to meet. For exchanges in which these requirements do not capture the needs of the participating agencies and satellite operators, another mechanism may be selected. This document is an international standard published under the auspices of CCSDS and International Standards Organization (ISO) Technical Committee 20, Subcommittee 13, developed jointly and in concert with the ISO TC20/SC14. As such, this CCSDS standard is also properly labeled as ISO 26900. The recommended Orbit Data Message format is ASCII (reference REF R_ISO_IEC_8859_1_1998 \h [4] 08D0C9EA79F9BACE118C8200AA004BA90B02000000080000001600000052005F00490053004F005F004900450043005F0038003800350039005F0031005F0031003900390038000000 ). This document describes both ‘Keyword = Value Notation’ (KVN) as well as Extensible Markup Language (XML) (reference REF R_505x0b3XMLSpecificationforNavigationDa \h[5] 08D0C9EA79F9BACE118C8200AA004BA90B02000000080000002800000052005F00350030003500780030006200330058004D004C00530070006500630069006600690063006100740069006F006E0066006F0072004E0061007600690067006100740069006F006E0044000000 ) formatted messages. Selection of KVN or XML format should be mutually agreed between message exchange partners. NOTE – As currently specified, an OPM, OMM, or OEM file is to represent orbit data for a single spacecraft, and the OCM is to represent orbit data for either a single spacecraft or single parent spacecraft of a parent/child spacecraft deployment scenario. It is possible that the architecture may support multiple spacecraft per file; this could be considered in the future.

Systèmes de transfert des informations et données spatiales — Messages pour données d'orbites

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ISO/PRF 26900 - Space data and information transfer systems — Orbit data messages Released:28. 11. 2023
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Second edition
Space data and information transfer
systems — Orbit data messages
Systèmes de transfert des informations et données spatiales —
Messages pour données d'orbites
Reference number
ISO 26900:2024(E)
© ISO 2024

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ISO 26900:2024(E)
© ISO 2024
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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© ISO 2024 – All rights reserved

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ISO 26900:2024(E)
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different types of ISO document should be noted (see
ISO draws attention to the possibility that the implementation of this document may involve the use of
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This document was prepared by the Consultative Committee for Space Data Systems (CCSDS) (as CCSDS
502.0-B-3, Apil 2023) and drafted in accordance with its editorial rules. It was assigned to Technical
Committee ISO/TC 20, Aircraft and space vehicles, Subcommittee SC 14, Space systems and operations and
adopted under the “fast-track procedure”.
This second edition cancels and replaces the first edition (ISO 26900:2012), which has been technically
The main changes compared to the previous edition are as follows:
— Changes in the messages:
— The OCM was added to provide better support for ISO Technical Committee 20, Subcommittee 14
objectives (see section 6).
— MESSAGE_ID was added to the OPM, OMM, and OEM to provide better satisfaction of
requirement P10 (identification and annotation of messages).
— EPHEMERIS_TYPE was updated in the OMM to reflect currently used numbering scheme.
— BSTAR and MEAN_MOTION_DDOT fields are paired with BTERM and AGOM parameters to
support the SGP and SGP4 propagators as well as the new SGP4-XP propagator, respectively.
© ISO 2024 – All rights reserved iii

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ISO 26900:2024(E)
— Changes in the document:
— A new CCSDS repository for normative keyword values for navigation messages has
been created at the SANA Registry, accessible on the Internet at: (See annex B for details
on the affected keywords and links to the content.)
— Several annexes were added. Some are required by CCSDS rule changes, and some are for the
provision of supplementary material.
— Examples for OPM, OMM, and OEM that formerly appeared in sections 3, 4, and 5, respectively,
have been moved to an informative annex.
— The ‘Checklist ICD’ that was added in ODM Version 2 has been discontinued. T

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