OSAM-1 (On-orbit Servicing, Assembly, and Manufacturing 1) was a 2016-2024 conceptual NASA mission and spacecraft designed to test on-orbit refilling of satellites. The program was cancelled in 2024, two years ahead of its planned launch date. It was initially known as Restore-L. [1] [2] [3]
Originally scheduled to launch in 2020, [4] its launch at the time of cancellation was planned for no earlier than 2026. [5] The primary objective of the concept mission and spacecraft was the complex refueling of Landsat 7, a satellite launched in 1999, that was not designed for on-orbit servicing. This would have involved grasping the satellite with a mechanical arm, gaining access to the satellite's fuel tank by cutting through insulation and wires and unscrewing a bolt, and then attaching a hose to pump in hydrazine fuel. At the time the mission was conceived, it was expected to be the first refueling of a satellite in space, and a demonstration of the potential to repair some of the thousands of active satellites in orbit and keep them in operation for a longer time. [1] Because the satellites now in space were not designed to be serviced, there are significant challenges to doing so successfully. [1] [2]
OSAM-1's second objective, added in 2020, was to deploy a separate robot called SPIDER (Space Infrastructure Dexterous Robot) to build a new structure in space. Using robots to build and assemble new structural components from scratch would be an important step towards a type of space-based construction that had been impossible to date. [1]
The OSAM-1 spacecraft was to include:
In 2016, NASA's Restore-L satellite was intended to refuel Landsat 7. [4]
In 2020, SPIDER was added and the name was changed from Restore-L to OSAM-1.
In Feb 2022, OSAM-1 passed its Critical Design Review. [6]
On 04 Sept 2023, NASA notified Congress of their intent to cancel OSAM-1. [7]
On 20 Sept 2023 the satellite bus arrived at NASA Goddard from Maxar. [8]
On 1 March 2024, NASA announced that OSAM-1 had been cancelled due to "continued technical, cost, and schedule challenges, and a broader community evolution away from refueling unprepared spacecraft." [9]
OSAM-1 was funded by NASA’s Space Technology Mission Directorate through its Technology Demonstration Missions program. [10]
At cancellation in 2024, about $2 billion had been invested in the project. [11]
A subsequent mission, OSAM-2, would have also had two robotic arms. [12] OSAM-2 would have used ModuLink software which is based on xLink. [12] In 2023, NASA decided to conclude the OSAM-2 project without proceeding to a flight demonstration. [13]
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Landsat 7 is the seventh satellite of the Landsat program. Launched on 15 April 1999, Landsat 7's primary goal is to refresh the global archive of satellite photos, providing up-to-date and cloud-free images. The Landsat program is managed and operated by the United States Geological Survey, and data from Landsat 7 is collected and distributed by the USGS. The NASA WorldWind project allows 3D images from Landsat 7 and other sources to be freely navigated and viewed from any angle. The satellite's companion, Earth Observing-1, trailed by one minute and followed the same orbital characteristics, but in 2011 its fuel was depleted and EO-1's orbit began to degrade. Landsat 7 was built by Lockheed Martin Space Systems.
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On-orbit satellite servicing refers to refueling or repairing space satellites while in orbit.
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