September 22, 2004

DART

Status (processing notes)

At Vandenberg Air Force Base, the Pegasus XL launch vehicle completed its buildup and testing is in progress. The first of three Pegasus Flight Simulations was completed Aug. 18 and the second on Sept. 9. The final simulation is scheduled to be conducted next week on Sept. 30.

The upper stage that will provide maneuvering for the spacecraft during mission operations for DART was demated from the third stage this week to inspect its pressure transducer and associated electrical harness. Installation of the Advanced Video Guidance Sensor (AVGS) hardware, the primary technology demonstration experiment, was completed into the satellite Sept. 15 after arriving at Vandenberg Sept. 12. The optical characterization testing and final performance verification test will be conducted later this month.

DART was designed and built for NASA by Orbital Sciences Corporation as an advanced flight demonstrator to locate and maneuver near an orbiting satellite. The DART spacecraft weighs about 800 pounds and is nearly 6 feet long and 3 feet in diameter. The Orbital Sciences Pegasus XL vehicle will launch DART into a circular polar orbit of approximately 475 miles.

The DART satellite provides a key step in establishing autonomous rendezvous capabilities for the U.S. Space Program. While previous rendezvous and docking efforts have been piloted by astronauts, the unmanned DART satellite will have computers and cameras to perform its rendezvous functions.

Once in orbit, DART will make contact with a target satellite, the Multiple Paths, Beyond-Line-of-Site Communications (MUBLCOM), also built by Orbital Sciences and launched in 1999. DART will then perform several close-proximity operations, such as moving toward and away from the satellite using navigation data provided by on-board sensors. The entire mission will last only 24 hours and will be accomplished without human intervention. The DART flight computer will determine its own path to accomplish its mission objectives.

Swift

Status (processing notes)

Swift is in the clean room at NASA’s Hangar AE on Cape Canaveral Air Force Station. The Observatory Integrated Systems Tests is underway today. An Observatory Operational Simulation is scheduled for Sept. 23-24 with two others planned to occur next week.

The start of stacking of the Boeing Delta II first stage on Pad 17-A has been rescheduled for Thursday, September 23 due to higher than allowable wind at the launch complex. Attachment of the three strap-on solid rocket boosters is scheduled for Sept. 24. The second stage will be hoisted into position atop the first stage on Sept. 25.

The Swift observatory will pinpoint the location of distant yet fleeting explosions that appear to signal the births of black holes. Gamma-ray bursts are the most powerful explosions known in the universe, emitting more than 100 billion times the energy that the Sun does in a year. Yet they last only from a few milliseconds to a few minutes, never to appear in the same spot again.

The Swift satellite is named for the nimble bird, because it can swiftly turn and point its instruments to catch a burst “on the fly” to study both the burst and its afterglow. This afterglow phenomenon follows the initial gamma-ray flash in most bursts and it can linger in X-ray light, visible light and radio waves for hours or weeks, providing great detail for observations.

Swift is a medium-class Explorer mission managed by NASA’s Goddard Space Flight Center in Greenbelt, Md. The observatory was built for NASA by Spectrum Astro, a division of General Dynamics. The Kennedy Space Center in Florida is responsible for Swift’s integration with the Boeing Delta II rocket and the countdown management on launch day.

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