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The U.S. Space Force has temporarily halted national security launches utilizing United Launch Alliance’s (ULA) Vulcan Centaur rocket following an anomaly detected during its most recent mission, USSF-87. The pause, announced just hours ago, raises questions about the future of critical space-based capabilities and ULA’s role in delivering them. This decision underscores the stringent safety requirements for missions carrying sensitive national security payloads and highlights the complexities of modern space launch operations.
The February 12th launch of USSF-87, while ultimately successful in delivering a national security payload to geosynchronous orbit, experienced an issue with its solid rocket boosters. While the spacecraft reached its intended orbit, the anomaly has prompted a thorough investigation by ULA and the Space Force. The specifics of the issue remain under review, but officials have indicated it involves the performance of the boosters during ascent. This incident marks the fourth successful launch of the Vulcan Centaur since its debut in January 2024, but it’s the first to trigger a launch pause.
“Until this anomaly is solved we will not be launching Vulcan missions,” a Space Force spokesperson stated, according to Breaking Defense. The USSF-87 mission carried the Geosynchronous Space Situational Awareness Program (GSSAP) system, designed to enhance the ability to detect and characterize disturbances in the geosynchronous environment. The Vulcan Centaur rocket, in a VC4S configuration with four solid rocket boosters, delivered the payload to an orbit more than 22,000 miles (35,000 km) above Earth.
The Vulcan Centaur is a heavy-lift launch vehicle developed by ULA, aiming to replace the Atlas V and Delta IV rockets. With a starting cost of $110 million per launch, the Vulcan Centaur is designed to provide reliable and cost-effective access to space for both government and commercial customers. The rocket is 61.6 meters (202 feet) tall in its standard configuration and can deliver up to 27,200 kg (60,000 lb) to Low Earth Orbit (LEO).
Booster Anomaly Details
The anomaly observed during the USSF-87 launch involved the six solid rocket boosters (SRBs) used to augment the Vulcan Centaur’s first stage. According to documentation, the boosters are 21.98 meters (865.3 inches) tall and generate a combined thrust of 12,364 kN (2,779,494 lbf) when all six are utilized. The boosters are composed of AP / HTPB / Al propellant and burn for approximately 87.3 seconds. While ULA confirmed the mission was successful, the investigation will focus on understanding the precise nature of the booster performance deviation.
Impact on National Security Space Launch Program
The pause in national security launches could have implications for the Space Force’s ability to maintain and enhance its space-based assets. The USSF-87 mission was the second National Security Space Launch (NSSL) mission for the Vulcan Centaur, and further delays could impact the timeline for deploying critical capabilities. ULA has stated it is working closely with the Space Force to resolve the issue and resume launches as quickly as possible. The company’s website confirms the successful launch of USSF-87 and details the mission’s objectives, including improving space situational awareness. ULA’s mission page provides further details on the payload and launch profile.
Some observers are skeptical about a swift resolution. A post on Reddit’s r/ula forum suggests the pause could extend throughout the year, citing the Space Force’s apparent dissatisfaction with the anomaly.
What to Watch Next
The immediate focus is on the ongoing investigation led by ULA and the Space Force. The results of this investigation will determine the timeline for resuming Vulcan Centaur launches and may necessitate modifications to the rocket’s design or operational procedures. The Space Force will likely prioritize a thorough understanding of the anomaly to ensure the reliability of future national security missions. The next confirmed launch date for a Vulcan Centaur mission remains uncertain, pending the outcome of the investigation.
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