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| GOES-9 | |
|---|---|
| Name | GOES-9 |
| Mission type | Weather satellite |
| Operator | National Oceanic and Atmospheric Administration (NOAA) |
| Cospar id | 1995-047A |
| Satcat | 23601 |
| Spacecraft type | Geostationary Operational Environmental Satellite |
| Manufacturer | Space Systems/Loral |
| Launch mass | 2230 kg |
| Launch date | 1995-07-23 |
| Launch rocket | Atlas IIAS |
| Launch site | Cape Canaveral Air Force Station |
| Disposal type | Decommissioned |
| Orbit reference | Geocentric orbit |
| Orbit regime | Geostationary orbit |
GOES-9 was a geostationary meteorological satellite operated by NOAA and part of the Geostationary Operational Environmental Satellites series developed for continuous weather monitoring, environmental observation, and disaster support. Built by Space Systems/Loral for the United States Department of Commerce, the satellite provided multispectral imaging, atmospheric sounding, and space weather data during operations spanning the late 1990s and early 2000s. Its data supported agencies and programs such as the National Weather Service, Japan Meteorological Agency, and regional disaster response efforts in the Pacific Ocean basin.
GOES-9 functioned within a lineage that includes earlier platforms like GOES-8 and later systems such as GOES-13 and GOES-16, contributing to the continuous satellite climatology record relied upon by the World Meteorological Organization and regional centers including the Australian Bureau of Meteorology and the Japan Meteorological Agency. The satellite occupied a geostationary station over the Pacific, providing coverage complementary to polar-orbiting systems like NOAA-15 and MetOp-A. Its mission profile emphasized operational continuity for short-term forecasting used by services such as the National Hurricane Center and the Joint Typhoon Warning Center.
GOES-9 was based on the SSL 1300 spacecraft bus, sharing heritage with commercial and scientific platforms such as Tele-X and communications satellites built by Space Systems/Loral. Its payload included an imager and sounder suite comparable to instruments on GOES-8: the Imager provided visible and infrared channels for cloud and surface observations used by organizations like the National Oceanic and Atmospheric Administration and the European Organisation for the Exploitation of Meteorological Satellites. The Sounder produced vertical temperature and moisture profiles critical to assimilation systems operated by centers such as the NCEP and the ECMWF. Space environment monitoring instruments supplied data relevant to NOAA Space Weather Prediction Center operations and agencies such as NASA and the Japan Aerospace Exploration Agency.
Launched aboard an Atlas IIAS from Cape Canaveral Air Force Station on 23 July 1995, GOES-9 entered a geostationary transfer followed by orbit-raising maneuvers that placed it in a geostationary slot. Early checkout involved mission control teams drawn from NOAA and the National Environmental Satellite, Data, and Information Service working with contractors including Space Systems/Loral and launch service providers like Lockheed Martin. Initial calibration campaigns referenced radiometric standards used by projects such as SeaWiFS and intercalibration efforts with NOAA-12 and NOAA-14.
During its operational life GOES-9 served as a primary and backup geostationary asset for the Pacific Ocean region, supporting forecasting offices including the Central Pacific Hurricane Center and the National Weather Service offices in Honolulu and Guam. The platform contributed to tropical cyclone monitoring for systems such as Typhoon Paka and supported maritime safety in coordination with the International Maritime Organization. GOES-9 was repositioned at times to provide gap-filling coverage, cooperating with satellites like GOES-10 and international partners including the Japan Meteorological Agency and the Philippine Atmospheric, Geophysical and Astronomical Services Administration.
Throughout its mission GOES-9 experienced technical degradations consistent with aging spacecraft of the era. Attitude control and gyroscope wear were monitored by teams referencing failures seen on platforms such as GOES-7 and GOES-8, and contingency operations involved mode changes coordinated with NOAA and payload engineers from Space Systems/Loral. Instrument channel noise and occasional sensor calibration drift required cross-calibration with contemporaneous satellites like Meteosat-7 and polar-orbiting assets including NOAA-16. End-of-life power margin declines followed patterns observed on other geostationary satellites such as Intelsat series craft.
As replacements including GOES-13 came into service, GOES-9 was retired from primary operational status and eventually decommissioned according to deactivation practices used by NOAA and NASA. Final commands included depletion of propellant and passivation procedures similar to those applied to GOES-8 and GOES-10, and the satellite was moved to a disposal orbit compliant with guidelines discussed at forums like the Inter-Agency Space Debris Coordination Committee. End-of-mission activities were coordinated with agencies such as the United States Space Force for tracking cataloguing by USSPACECOM.
The satellite's long record provided continuity in the geostationary climate data record used by research programs at institutions including NOAA's National Centers for Environmental Information, NASA Goddard Space Flight Center, and universities such as Colorado State University and the University of Washington. GOES-9 data underpinned improvements in tropical cyclone track forecasts used by the National Hurricane Center and numerical weather prediction advancement at centers like the National Centers for Environmental Prediction and the European Centre for Medium-Range Weather Forecasts. The operational lessons informed design choices for follow-on systems like GOES-R Series and fostered international collaboration among agencies including the Japan Meteorological Agency, the Australian Bureau of Meteorology, and the Philippine Atmospheric, Geophysical and Astronomical Services Administration.
Category:Geostationary Operational Environmental Satellites Category:Spacecraft launched in 1995