# Aqua

> NASA Earth observation satellite

**Wikidata**: [Q17397](https://www.wikidata.org/wiki/Q17397)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Aqua_(satellite))  
**Source**: https://4ort.xyz/entity/aqua

## Summary
Aqua is a NASA Earth observation satellite launched on May 4, 2002, to study the planet's water cycle, climate, and weather patterns. It operates as part of the A-Train constellation, providing critical data on atmospheric and oceanic conditions. Aqua is known for its advanced scientific instruments, including the Advanced Microwave Scanning Radiometer for Earth Observations (AMSR-E).

## Key Facts
- **Launch Date**: May 4, 2002, at 09:54:58 UTC.
- **Operator**: National Aeronautics and Space Administration (NASA).
- **Launch Vehicle**: Delta II (configuration D291), launched from Vandenberg Space Launch Complex 2 West.
- **Mass**: 3,117 kilograms (launch weight).
- **Orbit**: Near-polar sun-synchronous orbit with a 99-minute period, 702–703 km altitude, and 98.2° inclination.
- **Scientific Instruments**: Carries AMSR-E, among others, to monitor Earth's water and energy cycles.
- **Mission Status**: Part of the A-Train satellite constellation, contributing to long-term climate and weather research.

## FAQs
### Q: When was the Aqua satellite launched?
A: Aqua was launched on May 4, 2002, at 09:54:58 UTC from Vandenberg Space Launch Complex 2 West aboard a Delta II rocket.

### Q: What is the primary mission of Aqua?
A: Aqua’s mission is to collect data on Earth’s water cycle, including atmospheric humidity, ocean temperatures, and ice coverage, to improve understanding of climate and weather systems.

### Q: What instruments does Aqua carry?
A: Aqua carries several advanced instruments, including the Advanced Microwave Scanning Radiometer for Earth Observations (AMSR-E), designed to observe global sea surface temperature, soil moisture, and atmospheric conditions.

## Why It Matters
Aqua plays a pivotal role in Earth science research by providing high-resolution data on the planet’s water and energy cycles. Its observations of ocean temperatures, atmospheric humidity, and ice coverage are critical for weather forecasting, climate modeling, and understanding long-term environmental changes. As part of the A-Train constellation, Aqua collaborates with other satellites to create a comprehensive dataset, enabling scientists to study phenomena like hurricanes, droughts, and polar ice melt. This data supports policymakers and researchers in addressing climate change, managing natural resources, and mitigating weather-related disasters.

## Notable For
- **A-Train Constellation**: Operates in a coordinated group of Earth-observing satellites, enhancing data synergy and scientific insights.
- **AMSR-E Instrument**: Provided unprecedented measurements of global sea surface wind speed, soil moisture, and atmospheric conditions until its malfunction in 2011.
- **Long-Term Operation**: Exceeded its initial 6-year design life, continuing operations for over two decades and contributing to sustained climate records.
- **High-Altitude Orbit**: Maintains a stable 705 km orbit, optimizing coverage and data consistency for monitoring global environmental changes.

## Body
### Mission Overview
Aqua was launched on May 4, 2002, as part of NASA’s Earth Observing System (EOS) program. Its name, Latin for "water," reflects its focus on studying Earth’s water cycle. The satellite operates in a near-polar sun-synchronous orbit, ensuring consistent lighting conditions for observing the planet’s surface and atmosphere.

### Technical Specifications
- **Manufacturer**: TRW Inc.
- **Spacecraft Bus**: T330 model.
- **Power Output**: 4,444 watts.
- **Orbital Parameters**:
  - **Semi-Major Axis**: 7,080 km.
  - **Eccentricity**: 0.0000979.
  - **Longitude of Ascending Node**: 92.2063°.
  - **Argument of Periapsis**: 120.4799°.
  - **Mean Anomaly**: 351.4268°.

### Launch and Operations
- **Launch Contractor**: Boeing.
- **Launch Vehicle**: Delta II (D291 configuration).
- **Launch Site**: Vandenberg Space Launch Complex 2 West.
- **Mission Duration**: Originally designed for 6 years; remains operational as of 2023.

### Scientific Contributions
Aqua’s instruments, including AMSR-E, have advanced understanding of:
- Global precipitation and evaporation patterns.
- Sea ice extent and ocean current dynamics.
- Atmospheric temperature and humidity profiles.
- Land surface temperatures and vegetation health.

### Data Accessibility
Data from Aqua is publicly available through NASA’s Earthdata portal, supporting research in meteorology, oceanography, and climate science. The satellite’s findings have been integral to Intergovernmental Panel on Climate Change (IPCC) assessments and international environmental monitoring initiatives.

## References

1. Jonathan's Space Report
2. Freebase Data Dumps. 2013
3. [Source](https://space.skyrocket.de/doc_sdat/eos-pm-1.htm)
4. [Source](https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=2002-022A)
5. [Source](https://naif.jpl.nasa.gov/pub/naif/toolkit_docs/C/req/naif_ids.html)