Landsat 9 Spacecraft, United States of America

Landsat 9

Landsat 9 is a proposed land surface mapping satellite under development by the National Aeronautics and Space Administration (NASA) and the United States Geological Survey (USGS).

It is the latest in the Landsat series of satellites developed by NASA under the US Sustainable Land Imaging (SLI) programme, which is aimed at enabling the development of a multi-decade, spaceborne system to provide global users with the high-quality, global, land-imaging measurements corresponding to the existing 44-year Landsat data record. The satellite will be operated by the USGS.

Scheduled to be launched in December 2020, the satellite will provide record of Earth's land surface and imagery for use in the fields of agriculture, forestry, education, regional planning and global change research.

Orbital ATK was awarded a contract to design and construct the Landsat 9 satellite in October 2016. The contractual scope also includes integration and testing, in-orbit satellite checkout, and mission operations support. The satellite is being manufactured by Orbital ATK's Space Systems Group at its Gilbert facility located in Arizona, US.

Landsat 9 is being developed with an estimated investment of $129.9m and is planned to be launched from Vandenberg Air Force Base (VAFB).

Landsat 9 satellite design and features

Landsat 9 satellite will integrate three mission segments including the space, launch and ground segments. The space and launch segments will be developed by NASA, whereas the ground segment and spacecraft mission operations after launch will be contrived by the USGS.

The satellite design was largely derived from the predecessor Landsat 8 satellite, which was launched in February 2013. Based on Orbital ATK's LEOStar-3 platform, the spacecraft will have a launch mass of 2,623kg and will feature deployable solar array and batteries. It will have a design life of five years.

Landsat 9 satellite mission details

The satellite will collect data by performing backward/forward sweep across the image swath. It will view across the entire swath at a time and will build strips of data.

Landsat 9 will measure changes on the global land surface at a scale allowing for the separation of human and natural causes of change. It will ensure the monitoring of health and state of the Earth and will assist the decision makers to make informed decisions in the event of issues relating to land use and resource availability.

The satellite will provide an impartial record of Earth's forests for governments and resource organisations across the world to validate environmental protection and carbon storage. It will also deliver water quality monitoring and crop condition reports.

The satellite will enable the monitoring of Earth's reef degradation, and global glacier and ice-shelf retreat. It can provide data on both natural and man-made disasters to save lives of humans. It will also provide data on climate change that affects Earth's surface and biology.

Instruments onboard

The Landsat 9 satellite will be installed with two instruments including operational land imager-2 (OLI-2) and thermal infrared sensor 2 (TIRS 2). The OLI-2 is being built by Ball Aerospace at Boulder in Colorado.

The instrument will offer visible, near infrared and shortwave-infrared light imagery of Earth's landscape. The instrument will include an optical telescope, focal plane array, focal plane electronics, calibration hardware, and instrument support electronics. The instrument will deliver data for nine spectral bands with a maximum ground sampling distance (GSD) of 30m.

The TIRS-2 is currently under development by the NASA Goddard Space Flight Center located at Greenbelt in Maryland. It will measure land surface temperature in two thermal infrared bands. The instrument will include two-band thermal imaging sensor, which offers images with a maximum GSD of 100m.

Ground control station

The ground control system will include a mission operations centre (MOC) located at the NASA Goddard Space Flight Center (GSFC), the ground network element (GNE) and the data processing and archive system (DPAS).

The MOC will enable the planning and programming of observatory activities and will also monitor the health and status of the ground operating systems. The GNE will provide necessary instrumentation to transmit command and telemetry data to the MOC. It will also send mission data to the DPAS, which will process, distribute and archive such data.