30 Nov 2018

Statement about the Karman Line

The Karman line is the 100km altitude used by FAI and many other organisations to mark the “boundary” of space . In the last few years there have been many scientific and technical discussions around this demarcation line for the “edge of space” and variance around this as a boundary condition for recognition of “astronaut” status.

Recently published analyses present a compelling scientific case for reduction in this altitude from 100km to 80km. These analyses combine data/modelling from a number of differing perspectives (latitudinal variations during solar cycles, theoretical lift coefficients for different size/configuration satellites ranging from cubesats to the International Space Station, perigee/apogee elliptical analysis of actual satellite orbital lifetimes etc) to a level that has never been done before in relation to this issue. They also provide an accurate overview of some of the historical arguments and inadvertent misrepresentations of Karman’s actual analyses and conclusions from over half a century ago.

FAI has therefore been in contact with the International Astronautical Federation (IAF) to propose that an international workshop is held during 2019 to fully explore this issue with input and participation from the astrodynamics and astronautical community. 

Such a seminar, to be held under joint FAI/IAF auspices, would enable discussion from a wide range of professionals with relevant expertise to analyse and discuss the issue and possible redefinition of the altitude used by international organisations including FAI to recognise human spaceflights.

If the findings lead to a redefinition of the boundary of space as it is in use by international organisations, FAI would review any performances made between today's statement and the date of implementation of the revised definition in order to ensure that these performances already take into consideration the findings as they exist today.