LANDSAT 9

Landsat 9 is an American Earth observation satellite and the ninth spacecraft to carry the Landsat designation, continuing a program of land-imaging missions that stretches back to 1972. Operated by the United States Geological Survey (USGS) and built at NASA's Goddard Space Flight Center, the satellite was launched on 27 September 2021 aboard an Atlas V 401 rocket from Vandenberg Space Force Base in California. It carries the NORAD catalog identifier 49260 and the international designator 2021-088A, and as of the time of writing it remains in active orbit. With a launch mass of 2,864 kg, Landsat 9 is among the heavier spacecraft in its class and represents a substantial investment in the continuity of the world's longest-running civilian land remote sensing program.

Mission and Purpose

The Landsat program was established to provide a consistent, long-term record of Earth's land surfaces, and Landsat 9 was designed to carry that mandate forward. The satellite fits into a decades-long effort to monitor how land use, vegetation cover, water bodies, glaciers, and urban areas change over time. This kind of continuous multi-decadal record is scientifically valuable precisely because it allows researchers and policymakers to observe gradual changes that would be invisible in any single snapshot—shifts in forest cover, the retreat of ice sheets, agricultural expansion, and coastal erosion among them.

Responsibility for Landsat 9 is divided between two federal agencies. NASA led the design, construction, and initial on-orbit testing phases, while the USGS takes over for day-to-day satellite operations as well as the management, archiving, and public distribution of the data the satellite collects. This two-agency model has been a defining feature of the Landsat program for several generations of satellites. The data gathered by Landsat 9 is made freely available to users worldwide, continuing a policy adopted earlier in the program's history that dramatically increased scientific and practical use of Landsat imagery.

The satellite's Critical Design Review—the formal engineering milestone at which a design is confirmed ready for fabrication—was completed in April 2018. Following that review, Northrop Grumman Innovation Systems was authorized to proceed with manufacturing the spacecraft. Construction and integration were managed under the oversight of Goddard Space Flight Center, which is listed as the manufacturer of record.

Orbit and Tracking

Landsat 9 operates in a sun-synchronous orbit (SSO), a type of near-polar orbit in which the satellite's orbital plane precesses at a rate that keeps it aligned with the Sun in a consistent geometric relationship throughout the year. This means the satellite passes over any given point on Earth's surface at approximately the same local solar time on each revisit. For an Earth observation mission focused on comparing imagery across seasons and years, this consistency is essential: lighting conditions at the moment of imaging remain roughly stable from pass to pass, making it far easier to distinguish genuine surface changes from variations caused simply by different illumination angles.

Landsat 9's orbital parameters reflect this design. The satellite maintains an apogee of 708 km and a perigee of 706 km—a nearly circular orbit with very little eccentricity. The inclination of 98.2° places it in the retrograde, polar-leaning geometry required for sun-synchronous operation, allowing it to achieve global or near-global surface coverage over repeated orbital cycles. Its orbital period is 98.8 minutes, meaning the satellite completes just under fifteen full orbits each day.

At this altitude and inclination, Landsat 9 moves fast enough to cover vast swaths of the planet while remaining low enough to capture imagery at the spatial resolution for which the Landsat series is known. The near-circular orbit also contributes to imaging consistency: because the satellite's altitude changes very little between its closest and farthest points from Earth, the imaging geometry and ground resolution remain stable across passes.

For tracking purposes, Landsat 9 can be followed using its NORAD ID 49260 on satellite-tracking platforms including this one. Its current two-line element (TLE) sets, updated regularly from ground-based radar observations, allow precise prediction of its ground track and visibility windows from any location on Earth.

Design and Operator

Landsat 9 was built at NASA's Goddard Space Flight Center in Greenbelt, Maryland, the agency installation with the longest history of Earth-observing satellite development. The satellite has a total mass of 2,864 kg, which places it in the category of medium-to-large Earth observation spacecraft—substantially heavier than many commercial imaging satellites that have entered the market in recent years, reflecting the full-featured scientific instrument payload a flagship government mission is expected to carry.

The satellite was lofted by a United Launch Alliance Atlas V in its 401 configuration—a variant that uses no solid rocket boosters and a four-meter payload fairing—from Space Launch Complex-3E at Vandenberg Space Force Base. This launch site on California's central coast is the standard departure point for satellites entering polar or sun-synchronous orbits, since launches toward the south or southwest from that latitude can achieve high inclinations without overflying populated areas.

Operational control of the satellite rests with the USGS, an agency of the U.S. Department of the Interior. The USGS has operated successive Landsat satellites since the program's earlier generations and maintains the Earth Resources Observation and Science (EROS) Center in South Dakota as the primary hub for Landsat data archiving and distribution. From a user perspective, Landsat 9 data flows through established USGS infrastructure and is accessible through public portals without charge.

The object type recorded in the satellite catalog is PAYLOAD, confirming that the object being tracked is the primary spacecraft itself rather than a rocket body or debris fragment associated with its launch.

Program Significance and Continuity

Landsat 9 is the ninth satellite to bear the Landsat name, but only the eighth to successfully reach orbit—a distinction that reflects the program's long history and the occasional setbacks common to any multi-decade spaceflight endeavor. The program as a whole has produced the most extensive continuous record of Earth's land surface ever compiled from space, and each new satellite is calibrated carefully to match the radiometric characteristics of its predecessors so that data from different missions can be compared directly.

The timing of Landsat 9's launch was driven in part by the operational status of Landsat 8, which had been functioning in orbit since 2013. By placing Landsat 9 into a complementary orbit, mission planners were able to increase the frequency with which any given area of Earth's surface is revisited by a Landsat-class instrument, improving the program's ability to capture cloud-free imagery and track rapidly changing conditions. This kind of planned overlap between successive satellites is a deliberate strategy to avoid data gaps and maintain the scientific value of the long-term archive.

From a broader perspective, Landsat 9 represents the federal government's sustained commitment to open Earth observation data as a public resource. The free-and-open data policy, under which full-resolution imagery is made available to any user anywhere in the world without licensing fees, has enabled a wide range of applications—from agricultural monitoring and disaster response to urban planning, climate research, and ecosystem assessment. That policy, combined with the program's longevity, makes the Landsat archive one of the most consequential datasets in the history of remote sensing.

How to Spot It

Landsat 9 orbits at an altitude of roughly 707 km in a nearly circular, near-polar sun-synchronous orbit, and under the right conditions it is visible to the naked eye from the ground. Like most satellites at this altitude, it appears as a steadily moving point of light crossing the sky over the course of a few minutes, brightest when it is near the center of the sky and fading toward the horizon. It does not flash or blink in the manner of a tumbling rocket body, and it carries no navigation lights, so visibility depends entirely on sunlight reflecting off its structure.

The best opportunities to observe Landsat 9 come during the hours just after sunset or just before sunrise, when the observer on the ground is in darkness but the satellite is still illuminated by the Sun. Because of its sun-synchronous orbit, passes occur at predictable local times, and the geometry of these passes shifts gradually over weeks and months. Using the NORAD ID 49260 in LowEarth's tracking tools will generate precise pass predictions for your location, including the time, direction, and maximum elevation of upcoming visible passes—the starting point for any observation attempt.