Satellite Spotlight: Aqua — Tracking Earth's Water Cycle from Orbit

Saturday, 13 June 2026 · 2 min read · Orbital Radar

NASA's Aqua Satellite in space, marking its 10th anniversary of Earth observation and climate data collection.

Image: NASA/GSFC

What is Aqua?

Aqua is a satellite launched by NASA in May 2002 as part of the Earth Observing System (EOS). It is specifically designed to collect data on Earth's water cycle, including information on precipitation, evaporation, and the cycling of water vapour. The satellite's name, Aqua, is derived from the Latin word for water, reflecting its primary mission focus. Aqua carries six key instruments that provide comprehensive data on various aspects of the hydrological cycle and climate change.

Mission and Purpose

NASA Earth Day 2019 event poster featuring vibrant Earth imagery and environmental awareness messages. — NASA Earth Day 2019 · Image: NASA/HQ

The primary mission of Aqua is to study Earth's water cycle and its role in the climate system. The satellite's suite of instruments measures atmospheric temperature and humidity, land and ocean surface temperatures, cloud cover, and water vapour. These data help scientists understand the processes that drive weather patterns and climate change. Aqua's findings contribute to improving weather forecasting and climate models. The satellite's data are also used in conjunction with other missions in the A-Train constellation, a group of satellites that fly in close formation to provide complementary observations.

📡 Enjoying this? Get posts like this weekly.

Orbital Characteristics

Artist's concept of Aqua Satellite orbiting Earth, showcasing its six advanced instruments for climate research. — NASA Aqua satellite carries six state-of-the-art instruments in a near-polar low-Earth orbit. Aqua is seen in this artist concept orbiting Earth. · Image: NASA/JPL

Aqua operates in a near-polar, sun-synchronous orbit, which allows it to pass over the same point on Earth at roughly the same local solar time each day. This orbit is ideal for climate monitoring as it provides consistent lighting conditions. Aqua's orbit has an altitude of approximately 705 kilometres and an inclination of 98.2 degrees. The satellite completes an orbit around Earth approximately every 99 minutes. Its NORAD ID is 27424. For those interested in tracking Aqua's current position and viewing opportunities, the Orbital Radar pass predictor provides real-time data.

Significance and Legacy

Since its launch, Aqua has been instrumental in advancing our understanding of Earth's water cycle and climate dynamics. The data collected by Aqua have been used in over 4,000 scientific papers, covering topics from cloud formation to oceanic heat content. Aqua's observations have improved weather prediction models and contributed to the assessment of natural disasters such as hurricanes and droughts. The satellite's legacy is evident in the continuity of data it provides, which is crucial for long-term climate studies. Aqua's success has paved the way for future missions aimed at understanding Earth's changing climate.

Current Status

As of 2023, Aqua remains operational and continues to provide valuable data to the scientific community. Despite being over two decades old, the satellite's instruments are still functioning well, although some have experienced minor degradations. NASA has extended Aqua's mission several times due to its ongoing contributions to climate science. The satellite's data are freely available to researchers worldwide, ensuring that its impact on climate research persists. For more detailed information on Aqua and its current status, the Orbital Radar Satellite Library offers an extensive profile of the mission.

🔭 Find it in the Satellite Library →