Aqua (EOS PM-1)
|Mission type||Earth observation|
|Mission duration||6 years (planned)|
Elapsed: 18 years, 6 months, 26 days
|Launch mass||3,117 kilograms (6,872 lb)|
|Dimensions||4.81 m × 16.7 m × 8.04 m (15.8 ft × 54.8 ft × 26.4 ft)|
|Start of mission|
|Launch date||May 4, 2002, 09:54:58UTC|
|Rocket||Delta II 7920-10L|
|Launch site||Vandenberg SLC-2W|
|Semi-major axis||7,080.6 kilometers (4,399.7 mi)|
|Perigee altitude||702 kilometers (436 mi)|
|Apogee altitude||703 kilometers (437 mi)|
|Argument of perigee||120.4799°|
|Epoch||02 June 2016, 10:25:37 UTC|
Logotype of the mission.
Aqua (EOS PM-1) is a NASA scientific research satellite in orbit around the Earth, studying the precipitation, evaporation, and cycling of water. It is the second major component of the Earth Observing System (EOS) preceded by Terra (launched 1999) and followed by Aura (launched 2004).
The name "Aqua" comes from the Latin word for water. The satellite was launched from Vandenberg Air Force Base on May 4, 2002, aboard a Delta II rocket. Aqua is on a Sun-synchronous orbit. It flies as the third in the satellite formation called the "A Train" with several other satellites (OCO-2, the Japanese GCOM W1, CALIPSO, CloudSat, and Aura).
Aqua is one of NASA's missions for Earth science operating in the A-Train constellation. It has demonstrated a very high level of precision in making the primary long-term measurements of the mission. These highly calibrated climate quality measurements of radiance, reflectance, and backscatter have been used to cross-calibrate past and present sensors launched by NASA, as well as a variety of sensors launched from other agencies and the international community. Thousands of scientists and operational users from around the world have made use of the Aqua data to address NASA's six interdisciplinary Earth science focus areas: Atmospheric Composition, Weather, Carbon Cycle and Ecosystems, Water and Energy Cycle, Climate Variability and Change, and Earth Surface and Interior.
Aqua has experienced some minor, non-mission ending anomalies.
Because of a 2007 anomaly with the Solid State Recorder (SSR) it can only hold two orbits worth of data. A series of solar array and array regulator electronics anomalies starting in 2010 has led to the loss of 13 strings of solar cells out of a total of 132 strings. A 2005 short circuit within a battery cell led to a partial loss of cell capacity. In 2009, a solar panel thermistor failed and an error in the Solar Array offset was detected. The offset issue has been corrected periodically since then. On September 8, 2007, the Dual Thruster Module (DTM-2) Heater experienced an anomaly. On August 16, 2020, The Formatter Multiplexer Unit (FMU) experienced an anomaly, corrupting some data in the SSR and stopping all data streams until it was recovered on September 2, 2020.
The current end of mission plan has Aqua leaving the "A-Train" constellation in March 2022, with the mission continuing at a lower orbit until 2025. Aqua's life could be extended with a possible re-fueling mission. Worst-case scenario would result in a re-entry by 2046.
The Aqua spacecraft has a mass of about 2,850 kilograms (6,280 lb), plus propellant of about 230 kilograms (510 lb) at launch. Stowed for launch, the satellite fit in a volume of 2.68 m x 2.49 m x 6.49 m. Deployed, Aqua is 4.81 m x 16.70 m x 8.04 m.
Image of Arctic shrinkage from Aqua observations
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