ISO 27875-2019 amd1-2020 PDF

Full title and description

ISO 27875:2019/Amd 1:2020 — Space systems — Re-entry risk management for unmanned spacecraft and launch vehicle orbital stages — Amendment 1: formula to obtain Ec (expected casualties) by the product of the probability of impact on a specific latitude band and the population within that band, integrated over the latitude range covered by the orbital inclination.

Abstract

This amendment provides a technical clarification and a specific formulaic method to compute Ec (expected casualties/exposure) for ground‑impact risk assessment during uncontrolled or controlled re‑entry of unmanned spacecraft and launch‑vehicle orbital stages. It modifies ISO 27875:2019 by adding the latitude‑band integration approach so that population exposure is combined with impact probability over the latitude range defined by orbital inclination.

General information

• Status: Published (Amendment to ISO 27875:2019).
• Publication date: 8 September 2020 (Amendment 1 to the 2019 edition).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 49.140 — Space systems and operations.
• Edition / version: Amendment 1 to ISO 27875:2019 (applies to Edition 2 — 2019; amendment edition 2020).
• Number of pages: 1 (amendment document).

Scope

The amendment is limited to ISO 27875:2019 and specifies a formulaic approach for calculating Ec by multiplying the impact probability for a given latitude band with the population in that band and integrating across the latitude range covered by the orbit’s inclination. The underlying standard (ISO 27875:2019) applies to assessment, reduction and control of risks to people and the environment from re‑entering space vehicles (unmanned spacecraft and launch‑vehicle orbital stages).

Key topics and requirements

• Definition and use of Ec (expected casualties/exposure) in re‑entry risk assessments.
• Method for computing Ec via latitude‑band impact probability × population, integrated across orbital inclination ranges.
• Application to unmanned spacecraft, launch vehicle orbital stages and returning interplanetary spacecraft (as per ISO 27875 scope).
• Integration with existing re‑entry risk procedures and metrics defined in ISO 27875:2019 (complements ISO 24113 background references).
• Requirements for mission designers and risk analysts to include population distribution and orbital geometry in casualty estimates.

Typical use and users

Used by spacecraft and launch vehicle designers, mission planners, re‑entry risk analysts, national space agencies, launch service providers, regulatory authorities, safety assessment teams, and insurers. Typical tasks include: estimating casualty risk for uncontrolled re‑entry scenarios, documenting compliance with national/international safety requirements, performing mission trade‑offs to reduce ground risk, and informing debris mitigation planning.

Related standards

Closely related standards and guidance include ISO 27875:2019 (the main standard to which this amendment applies), ISO 24113 (space debris mitigation — useful background), and other ISO/TC 20/SC 14 publications and space‑systems debris/re‑entry guidance that are commonly packaged with ISO 27875 in space debris/ re‑entry collections.

Keywords

re‑entry risk management; Ec; expected casualties; impact probability; latitude band integration; orbital inclination; space systems; launch vehicle orbital stages; space debris; risk assessment.

FAQ

Q: What is this standard?

A: It is Amendment 1 (2020) to ISO 27875:2019, an ISO amendment that provides a specific formulaic method to compute Ec (expected casualties) for re‑entry risk assessments of unmanned spacecraft and launch‑vehicle orbital stages.

Q: What does it cover?

A: The amendment covers a mathematical approach to obtain Ec by combining impact probability on latitude bands with the population within those bands and integrating over the latitude range defined by orbital inclination. It does not replace the full ISO 27875:2019 text but supplements it with this calculation method.

Q: Who typically uses it?

A: Spacecraft designers, mission planners, re‑entry risk analysts, regulators and insurers use it when performing ground‑risk calculations for planned or unplanned re‑entries of unmanned space vehicles and orbital stages.

Q: Is it current or superseded?

A: The amendment was published in September 2020 and applies to ISO 27875:2019. At the time of publication the amendment was active; ISO metadata indicates the series may be subject to further revision (work on ISO/FDIS 27875 has been noted). Users should check the latest ISO catalogue or national standards body for any subsequent revisions or replacements.

Q: Is it part of a series?

A: Yes — it is an amendment to ISO 27875:2019 and is part of the ISO/TC 20/SC 14 (space systems) publication set addressing re‑entry risk and space debris; related standards are often bundled in ISO space/debris collections.

Q: What are the key keywords?

A: Ec, expected casualties, re‑entry, impact probability, latitude band, orbital inclination, re‑entry risk management, space systems, launch vehicle orbital stages.