| Name | Historical/Estimated Launch | Location | Detailed Location | Country | Cislunar Status | Orbit Type | Sources |
|---|---|---|---|---|---|---|---|
| Name ICE (aka ISEE-3) | Historical/Estimated Launch | Location Heliocentric Orbit The term "Heliocentric Orbit" is used here to describe objects that are primarily in the Sun-Earth system, as opposed to in the Earth-Moon vicinity. |
Detailed Location
Unknown |
Country USA | Cislunar Status On-orbit/End-of-life | Orbit Type Heliocentric Orbit | Sources https://science.nasa.gov/mission/isee-3-ice/ |
| Name Ulysses | Historical/Estimated Launch | Location Heliocentric Orbit The term "Heliocentric Orbit" is used here to describe objects that are primarily in the Sun-Earth system, as opposed to in the Earth-Moon vicinity. |
Detailed Location
80 deg inclination, 1 AU x 5 AU eccentric orbit |
Country ESA | Cislunar Status On-orbit/End-of-life | Orbit Type Heliocentric Orbit | Sources https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1990-090B |
| Name GEOTAIL | Historical/Estimated Launch | Location xGEO The term "xGEO" can refer to anything above geosynchronous altitude of ~36,000 km above Earth, but in this document it is used specifically to refer to Earth-orbiting missions. XGEO describes high-altitude Earth orbiters, but those that are still dominated by Earth's gravity as opposed to the Moon's gravity or combined three-body effects. |
Detailed Location
HEO Highly Eccentric Orbit : 58,000 km x 190,000 km, 30 deg inclination |
Country USA | Cislunar Status On-orbit/End-of-life | Orbit Type xGEO | Sources https://www.isas.jaxa.jp/en/missions/spacecraft/past/geotail.html |
| Name Wind | Historical/Estimated Launch | Location Sun-Earth L1 Lagrange point 1/2 in the Sun-Earth system, as opposed to the Earth-Moon system. |
Detailed Location
Halo |
Country USA | Cislunar Status On-orbit/Operational | Orbit Type Heliocentric Orbit | Sources https://science.nasa.gov/mission/wind/ |
| Name SOHO | Historical/Estimated Launch | Location Sun-Earth L1 Lagrange point 1/2 in the Sun-Earth system, as opposed to the Earth-Moon system. |
Detailed Location
Lissajous |
Country ESA | Cislunar Status On-orbit/Operational | Orbit Type Heliocentric Orbit | Sources https://science.nasa.gov/mission/soho/ |
| Name ACE | Historical/Estimated Launch | Location Sun-Earth L1 Lagrange point 1/2 in the Sun-Earth system, as opposed to the Earth-Moon system. |
Detailed Location
Lissajous |
Country USA | Cislunar Status On-orbit/Operational | Orbit Type Heliocentric Orbit | Sources https://science.nasa.gov/mission/ace/ |
| Name CLUSTER-1 | Historical/Estimated Launch | Location xGEO The term "xGEO" can refer to anything above geosynchronous altitude of ~36,000 km above Earth, but in this document it is used specifically to refer to Earth-orbiting missions. XGEO describes high-altitude Earth orbiters, but those that are still dominated by Earth's gravity as opposed to the Moon's gravity or combined three-body effects. |
Detailed Location
HEO Highly Eccentric Orbit : 20,000 km x 110,000 km, 135 deg inclination |
Country ESA | Cislunar Status On-orbit/Operational | Orbit Type xGEO | Sources https://www.esa.int/Enabling_Support/Operations/Cluster_II_operations |
| Name CLUSTER-2 | Historical/Estimated Launch | Location xGEO The term "xGEO" can refer to anything above geosynchronous altitude of ~36,000 km above Earth, but in this document it is used specifically to refer to Earth-orbiting missions. XGEO describes high-altitude Earth orbiters, but those that are still dominated by Earth's gravity as opposed to the Moon's gravity or combined three-body effects. |
Detailed Location
HEO Highly Eccentric Orbit : 20,000 km x 110,000 km, 135 deg inclination |
Country ESA | Cislunar Status On-orbit/Operational | Orbit Type xGEO | Sources https://www.esa.int/Enabling_Support/Operations/Cluster_II_operations |
| Name CLUSTER-3 | Historical/Estimated Launch | Location xGEO The term "xGEO" can refer to anything above geosynchronous altitude of ~36,000 km above Earth, but in this document it is used specifically to refer to Earth-orbiting missions. XGEO describes high-altitude Earth orbiters, but those that are still dominated by Earth's gravity as opposed to the Moon's gravity or combined three-body effects. |
Detailed Location
HEO Highly Eccentric Orbit : 20,000 km x 110,000 km, 135 deg inclination |
Country ESA | Cislunar Status On-orbit/Operational | Orbit Type xGEO | Sources https://www.esa.int/Enabling_Support/Operations/Cluster_II_operations |
| Name CLUSTER-4 | Historical/Estimated Launch | Location xGEO The term "xGEO" can refer to anything above geosynchronous altitude of ~36,000 km above Earth, but in this document it is used specifically to refer to Earth-orbiting missions. XGEO describes high-altitude Earth orbiters, but those that are still dominated by Earth's gravity as opposed to the Moon's gravity or combined three-body effects. |
Detailed Location
HEO Highly Eccentric Orbit : 20,000 km x 110,000 km, 135 deg inclination |
Country ESA | Cislunar Status On-orbit/Operational | Orbit Type xGEO | Sources https://www.esa.int/Enabling_Support/Operations/Cluster_II_operations |
| Name WMAP | Historical/Estimated Launch | Location Heliocentric Orbit The term "Heliocentric Orbit" is used here to describe objects that are primarily in the Sun-Earth system, as opposed to in the Earth-Moon vicinity. |
Detailed Location
Unknown heliocentric graveyard orbit |
Country USA | Cislunar Status On-orbit/End-of-life | Orbit Type Heliocentric Orbit | Sources https://wmap.gsfc.nasa.gov/mission/ |
| Name INTEGRAL | Historical/Estimated Launch | Location xGEO The term "xGEO" can refer to anything above geosynchronous altitude of ~36,000 km above Earth, but in this document it is used specifically to refer to Earth-orbiting missions. XGEO describes high-altitude Earth orbiters, but those that are still dominated by Earth's gravity as opposed to the Moon's gravity or combined three-body effects. |
Detailed Location
HEO Highly Eccentric Orbit : 12500 km x 150,000 km, 87 deg inclination |
Country ESA | Cislunar Status On-orbit/Operational | Orbit Type xGEO | Sources https://www.aanda.org/articles/aa/pdf/2003/43/aaINTEGRAL59.pdf |
| Name STEREO-A | Historical/Estimated Launch | Location Heliocentric Orbit The term "Heliocentric Orbit" is used here to describe objects that are primarily in the Sun-Earth system, as opposed to in the Earth-Moon vicinity. |
Detailed Location
Slighly inside Earth's orbit, slowly drifting ahead |
Country USA | Cislunar Status On-orbit/Operational | Orbit Type Heliocentric Orbit | Sources https://stereo.gsfc.nasa.gov/mission/mission.shtml |
| Name STEREO-B | Historical/Estimated Launch | Location Heliocentric Orbit The term "Heliocentric Orbit" is used here to describe objects that are primarily in the Sun-Earth system, as opposed to in the Earth-Moon vicinity. |
Detailed Location
Slighly outside Earth's orbit, slowly drifting behind |
Country USA | Cislunar Status On-orbit/End-of-life | Orbit Type Heliocentric Orbit | Sources https://stereo.gsfc.nasa.gov/mission/mission.shtml |
| Name ARTEMIS-P1 (aka THEMIS-B) | Historical/Estimated Launch | Location Lunar Orbit Any vehicle that orbits the Moon (as opposed to relying on three-body effects) can be called a lunar orbit. In this document, it often refers to something that is not known to fall cleanly in the LLO or EFLO categories defined above. |
Detailed Location
Lunar Orbit Any vehicle that orbits the Moon (as opposed to relying on three-body effects) can be called a lunar orbit. In this document, it often refers to something that is not known to fall cleanly in the LLO or EFLO categories defined above. : Nearly equatorial, roughly 6 degrees inclination. 1500 km x 18000 km altitude. |
Country USA | Cislunar Status On-orbit/Operational | Orbit Type Lunar Orbit | Sources https://www.researchgate.net/profile/Stephen-Broschart/publication/228770147_Pr… |
| Name ARTEMIS-P2 (aka THEMIS-C) | Historical/Estimated Launch | Location Lunar Orbit Any vehicle that orbits the Moon (as opposed to relying on three-body effects) can be called a lunar orbit. In this document, it often refers to something that is not known to fall cleanly in the LLO or EFLO categories defined above. |
Detailed Location
Lunar Orbit Any vehicle that orbits the Moon (as opposed to relying on three-body effects) can be called a lunar orbit. In this document, it often refers to something that is not known to fall cleanly in the LLO or EFLO categories defined above. : Nearly equatorial but retrograde, roughly 175 degrees inclination. 1500 km x 18000 km altitude. |
Country USA | Cislunar Status On-orbit/Operational | Orbit Type Lunar Orbit | Sources https://www.researchgate.net/profile/Stephen-Broschart/publication/228770147_Pr… |
| Name THEMIS P3 | Historical/Estimated Launch | Location xGEO The term "xGEO" can refer to anything above geosynchronous altitude of ~36,000 km above Earth, but in this document it is used specifically to refer to Earth-orbiting missions. XGEO describes high-altitude Earth orbiters, but those that are still dominated by Earth's gravity as opposed to the Moon's gravity or combined three-body effects. |
Detailed Location
HEO Highly Eccentric Orbit : 9250 km x 83000 km; 5 deg inclination |
Country USA | Cislunar Status On-orbit/Operational | Orbit Type xGEO | Sources https://themis.igpp.ucla.edu/orbits.shtml, https://www.researchgate.net/publication/226100399_Orbit_design_for_the_THEMIS_… |
| Name THEMIS P4 | Historical/Estimated Launch | Location xGEO The term "xGEO" can refer to anything above geosynchronous altitude of ~36,000 km above Earth, but in this document it is used specifically to refer to Earth-orbiting missions. XGEO describes high-altitude Earth orbiters, but those that are still dominated by Earth's gravity as opposed to the Moon's gravity or combined three-body effects. |
Detailed Location
HEO Highly Eccentric Orbit : 9250 km x 83000 km; 7 deg inclination |
Country USA | Cislunar Status On-orbit/Operational | Orbit Type xGEO | Sources https://themis.igpp.ucla.edu/orbits.shtml, https://www.researchgate.net/publication/226100399_Orbit_design_for_the_THEMIS_… |
| Name THEMIS P5 | Historical/Estimated Launch | Location xGEO The term "xGEO" can refer to anything above geosynchronous altitude of ~36,000 km above Earth, but in this document it is used specifically to refer to Earth-orbiting missions. XGEO describes high-altitude Earth orbiters, but those that are still dominated by Earth's gravity as opposed to the Moon's gravity or combined three-body effects. |
Detailed Location
HEO Highly Eccentric Orbit : 9250 km x 83000 km; 10 deg inclination |
Country USA | Cislunar Status On-orbit/Operational | Orbit Type xGEO | Sources http://themis.igpp.ucla.edu/orbits.shtml, https://www.researchgate.net/publication/226100399_Orbit_design_for_the_THEMIS_… |
| Name Chandrayaan-1 | Historical/Estimated Launch | Location Low Lunar Orbit A low lunar orbit (LLO) is an orbit about the Moon that stays near the Lunar surface. There is no official definition, but altitudes under 1000 km is a reasonable working definition of "low". |
Detailed Location
LLO Low Lunar Orbit Any vehicle that orbits the Moon (as opposed to relying on three-body effects) can be called a lunar orbit. In this document, it often refers to something that is not known to fall cleanly in the LLO or EFLO categories defined above. A low lunar orbit (LLO) is an orbit about the Moon that stays near the Lunar surface. There is no official definition, but altitudes under 1000 km is a reasonable working definition of "low". : 150km to 270km, likely polar |
Country India | Cislunar Status On-orbit/End-of-life | Orbit Type Lunar Orbit | Sources https://solarsystem.nasa.gov/missions/chandrayaan-1/in-depth/, https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=2008-052A, https://web.archive.org/web/20170802210133/http://164.100.47.190/loksabhaquesti… |
| Name IBEX | Historical/Estimated Launch | Location xGEO The term "xGEO" can refer to anything above geosynchronous altitude of ~36,000 km above Earth, but in this document it is used specifically to refer to Earth-orbiting missions. XGEO describes high-altitude Earth orbiters, but those that are still dominated by Earth's gravity as opposed to the Moon's gravity or combined three-body effects. |
Detailed Location
HEO Highly Eccentric Orbit : 30,000 km x 320,000 km, 11 deg inclination. 3:1 resonant orbit with the Moon. Inclination varies significantly due to third-body perturbations. |
Country USA | Cislunar Status On-orbit/Operational | Orbit Type xGEO | Sources https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2011SW000704, https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=2008-051A |
| Name Lunar Reconnaissance Orbiter (LRO) | Historical/Estimated Launch | Location Low Lunar Orbit A low lunar orbit (LLO) is an orbit about the Moon that stays near the Lunar surface. There is no official definition, but altitudes under 1000 km is a reasonable working definition of "low". |
Detailed Location
LLO Low Lunar Orbit Any vehicle that orbits the Moon (as opposed to relying on three-body effects) can be called a lunar orbit. In this document, it often refers to something that is not known to fall cleanly in the LLO or EFLO categories defined above. A low lunar orbit (LLO) is an orbit about the Moon that stays near the Lunar surface. There is no official definition, but altitudes under 1000 km is a reasonable working definition of "low". : Mission: 50 km polar; Quasi-Frozen: 30x216 km altitude, mean argument of periapse 270 deg , eccentricity = 0.043 |
Country USA | Cislunar Status On-orbit/Operational | Orbit Type Lunar Orbit | Sources https://core.ac.uk/download/pdf/10537374.pdf |
| Name Planck | Historical/Estimated Launch | Location Heliocentric Orbit The term "Heliocentric Orbit" is used here to describe objects that are primarily in the Sun-Earth system, as opposed to in the Earth-Moon vicinity. |
Detailed Location
Unknown heliocentric graveyard orbit |
Country ESA | Cislunar Status On-orbit/End-of-life | Orbit Type Heliocentric Orbit | Sources https://www.esa.int/Enabling_Support/Operations/Planck |
| Name Herschel | Historical/Estimated Launch | Location Heliocentric Orbit The term "Heliocentric Orbit" is used here to describe objects that are primarily in the Sun-Earth system, as opposed to in the Earth-Moon vicinity. |
Detailed Location
Unknown heliocentric graveyard orbit |
Country ESA | Cislunar Status On-orbit/End-of-life | Orbit Type Heliocentric Orbit | Sources https://www.esa.int/Science_Exploration/Space_Science/Herschel_overview, https://www.cosmos.esa.int/documents/12133/1028864/Herschel+Post+Helium+Tests+A… |
| Name Gaia | Historical/Estimated Launch | Location Sun-Earth L2 Lagrange point 1/2 in the Sun-Earth system, as opposed to the Earth-Moon system. |
Detailed Location
Halo, 263,000 × 707,000 km, 180-day period |
Country ESA | Cislunar Status On-orbit/Operational | Orbit Type Heliocentric Orbit | Sources https://www.esa.int/Science_Exploration/Space_Science/Gaia_overview, https://science.nasa.gov/mission/gaia/ |
| Name DSCOVR | Historical/Estimated Launch | Location Sun-Earth L1 Lagrange point 1/2 in the Sun-Earth system, as opposed to the Earth-Moon system. |
Detailed Location
Lissajous |
Country USA | Cislunar Status On-orbit/Operational | Orbit Type Heliocentric Orbit | Sources https://www.nesdis.noaa.gov/current-satellite-missions/currently-flying/dscovr-… |
| Name LISA Pathfinder | Historical/Estimated Launch | Location Sun-Earth L1 Lagrange point 1/2 in the Sun-Earth system, as opposed to the Earth-Moon system. |
Detailed Location
Halo |
Country ESA | Cislunar Status On-orbit/Operational | Orbit Type Heliocentric Orbit | Sources https://www.esa.int/Science_Exploration/Space_Science/LISA_Pathfinder_overview |
| Name MMS-1 | Historical/Estimated Launch | Location xGEO The term "xGEO" can refer to anything above geosynchronous altitude of ~36,000 km above Earth, but in this document it is used specifically to refer to Earth-orbiting missions. XGEO describes high-altitude Earth orbiters, but those that are still dominated by Earth's gravity as opposed to the Moon's gravity or combined three-body effects. |
Detailed Location
HEO Highly Eccentric Orbit : 8900 km x 159300 km, 28.5 deg inclination |
Country USA | Cislunar Status On-orbit/Operational | Orbit Type xGEO | Sources https://link.springer.com/article/10.1007/s11214-015-0220-5 |
| Name MMS-2 | Historical/Estimated Launch | Location xGEO The term "xGEO" can refer to anything above geosynchronous altitude of ~36,000 km above Earth, but in this document it is used specifically to refer to Earth-orbiting missions. XGEO describes high-altitude Earth orbiters, but those that are still dominated by Earth's gravity as opposed to the Moon's gravity or combined three-body effects. |
Detailed Location
HEO Highly Eccentric Orbit : 8900 km x 159300 km, 28.5 deg inclination |
Country USA | Cislunar Status On-orbit/Operational | Orbit Type xGEO | Sources https://link.springer.com/article/10.1007/s11214-015-0220-5 |
| Name MMS-3 | Historical/Estimated Launch | Location xGEO The term "xGEO" can refer to anything above geosynchronous altitude of ~36,000 km above Earth, but in this document it is used specifically to refer to Earth-orbiting missions. XGEO describes high-altitude Earth orbiters, but those that are still dominated by Earth's gravity as opposed to the Moon's gravity or combined three-body effects. |
Detailed Location
HEO Highly Eccentric Orbit : 8900 km x 159300 km, 28.5 deg inclination |
Country USA | Cislunar Status On-orbit/Operational | Orbit Type xGEO | Sources https://link.springer.com/article/10.1007/s11214-015-0220-5 |
Cislunar Database
This database contains XGEO, cislunar, and heliocentric missions currently on orbit or planned, based on publicly available sources found by our team (including manufacturer websites, conference papers, press releases, etc.).