page_title: Advanced Composition Explorer
hierarchical_section_title: Advanced Composition Explorer
caption_attribution_description: English: An artist's rendering of the Advanced Composition Explorer (ACE) in orbit around the Sun–Earth L1 Lagrange point. Wizja artystyczna sondy Advanced Composition Explorer (ACE) na orbicie wokół punktu L1 układu Ziemia – Słońce.
context_page_description: Advanced Composition Explorer is a NASA Explorers program Solar and space exploration mission to study matter comprising energetic particles from the solar wind, the interplanetary medium, and other sources.
  Real-time data from ACE is used by the NOAA Space Weather Prediction Center to improve forecasts and warnings of solar storms. The ACE robotic spacecraft was launched August 25, 1997, and entered a Lissajous orbit close to the L₁ Lagrangian point on December 12, 1997. The spacecraft is currently operating at that orbit. Because ACE is in a non-Keplerian orbit, and has regular station-keeping maneuvers, the orbital parameters in the adjacent information box are only approximate.
  As of 2019, the spacecraft is still in generally good condition, and is projected to have enough propellant to maintain its orbit until 2024. NASA Goddard Space Flight Center managed the development and integration of the ACE spacecraft.
context_section_description: Advanced Composition Explorer (ACE) is a NASA Explorers program Solar and space exploration mission to study matter comprising energetic particles from the solar wind, the interplanetary medium, and other sources.
  Real-time data from ACE is used by the NOAA Space Weather Prediction Center to improve forecasts and warnings of solar storms. The ACE robotic spacecraft was launched August 25, 1997, and entered a Lissajous orbit close to the L₁ Lagrangian point (which lies between the Sun and the Earth at a distance of some 1.5 million km from the latter) on December 12, 1997. The spacecraft is currently operating at that orbit. Because ACE is in a non-Keplerian orbit, and has regular station-keeping maneuvers, the orbital parameters in the adjacent information box are only approximate.
  As of 2019, the spacecraft is still in generally good condition, and is projected to have enough propellant to maintain its orbit until 2024. NASA Goddard Space Flight Center managed the development and integration of the ACE spacecraft.
caption: ACE in orbit around the Sun–Earth L1 point.
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