Table 2. List of currently developed space debris evolutionary and engineering models

	Space debris evolutionary model					Space debris engineering model
	MOCAT	SOLEM	NEODEEM	DAMAGE	DELTA	LEGEND	MASTER	ORDEM
Debris modeling method	1D	1D	3D	3D	3D	3D	3D	3D
Country	USA (MIT)	China	Japan (JAXA, Kyushu University)	USA (University of Southampton)	ESA	NASA	ESA	NASA
Debris coverage	LEO	LEO	LEO-GEO	GEO	LEO-super-GEO	LEO-super-GEO	LEO-super-GEO	LEO-super-GEO

MOCAT, Massachusetts Institute of Technology (MIT) orbital capacity assessment tool; SOLEM, space object long-term evolution model; NEODEEM, near-earth orbital debris environment evolutionary model; DELTA, debris environment long-term analysis; LEGEND, NASA LEO-to-GEO environment debris 240; MASTER, meteoroid and space debris terrestrial environment reference; ORDEM, orbital debris engineering model; LEO, low Earth orbit; GEO, geostationary Earth orbit.