ULAs Vulcan launches Space Force mission; solid booster anomaly under investigation
This article was updated with additional comments from ULA on the solid booster anomaly
A United Launch Alliance Vulcan Centaur rocket lifted off early Feb. 12 on a multi-manifest national security mission, sending payloads directly to geosynchronous orbit more than 22,000 miles above Earth.
The rocket launched from Space Launch Complex 41 at Cape Canaveral Space Force Station at 4:22 a.m. Eastern, roughly an hour into a two-hour window.
Vulcan flew in a high-performance configuration with four strap-on solid rocket boosters, which burned for about 90 seconds before separating from the core stage. ULA ended its live broadcast after first-stage separation. The company said it would take about 10 hours for the Centaur upper stage to reach geosynchronous Earth orbit and deploy all payloads.
Shortly after liftoff some observers on social media noted what appeared to be an irregular plume or burn pattern from one of the solid rocket boosters during ascent, reminiscent of the anomaly seen on Vulcan's second flight.
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ULA confirmed it "had an observation early during flight on one of the four solid rocket motors, the team is currently reviewing the data. The booster, upper stage and spacecraft continued to perform on a nominal trajectory."
The U.S. Space Force mission, designated USSF-87, marked Vulcan's fourth flight overall and its second under the National Security Space Launch program.
About eight hours after liftoff, ULA confirmed the Centaur upper stage had successfully completed its planned burns and delivered the payloads directly into geosynchronous orbit.
About eight hours after liftoff, ULA confirmed the Centaur upper stage had successfully completed its planned burns and delivered the payloads directly into geosynchronous orbit.
Following the launch, Gary Wentz, ULA vice president of Atlas and Vulcan programs, acknowledged an issue with one of the strap-on motors.
"Early during flight, the team observed a significant performance anomaly on one of the four solid rocket motors. Despite the observation, the Vulcan booster and Centaur performed nominally and delivered the spacecraft directly to geosynchronous orbit," Wentz said in a statement. He said the company, along with government representatives, is reviewing technical data and available imagery and establishing a recovery team to collect any debris. "We will conduct a thorough investigation, identify root cause, and implement any corrective action necessary before the next Vulcan mission."
The Space Systems Command confirmed Vulcan successfully delivered the mission to the designated orbits despite an observed anomaly in one of the four solid rocket motors. The command said they "will work closely with ULA per our mission assurance space flight worthiness process before the next Vulcan national security space mission."
The primary payload is the Geosynchronous Space Situational Awareness Program, or GSSAP, a constellation the Space Force relies on to monitor activity in geosynchronous orbit, known as GEO.
Built by Northrop Grumman, the maneuverable satellites carry optical sensors designed to track and characterize objects in and around GEO. The system provides insight into on-orbit activity near U.S. and allied spacecraft.
GSSAP satellites have previously launched in pairs. Space Force officials have said this mission would carry two GSSAP spacecraft, though the Space Systems Command confirmed only that the payload is a GSSAP system.
USSF-87 also carries a secondary payload: a propulsive ESPA ring hosting additional spacecraft for the Space Force.
The propulsive ESPA-ring is a powered version of the standard EELV Secondary Payload Adapter, a ring-shaped structure originally developed to carry secondary payloads on military launches. Unlike a passive adapter, the propulsive version includes its own power and maneuvering capability.
On USSF-87, the ring carries research, development and training payloads for the Space Force. The ESPA ring will be deployed along with the primary GSSAP payload near geosynchronous orbit and will operate independently.
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