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Occurred 25 years ago

STS-96 was the second flight to the International Space Station.



mission duration

9 days, 19 hours, 13 minutes, 57 seconds


May 27, 1999


June 6, 1999
The crew of STS-96 in orange and white space suits pose for a portrait
STS-96 Crew photo with Commander Kent V. Rominger, Pilot Rick D. Husband, Mission Specialists Ellen Ochoa, Tamara E. Jernigan, Daniel T. Barry, Julie Payette and Valery Ivanovich Tokarev.

Mission Facts

Mission: Second International Space Station Flight
Space Shuttle: Discovery
Launch Pad: 39B
Launched: May 27, 1999, 6:49:42 a.m. EDT
Landing Site: Kennedy Space Center, Florida
Landing: June 6, 1999, 2:02:43 a.m. EDT
Runway: 15
Rollout Distance: 8,866 feet
Rollout Time: 56 seconds
Revolution: 154
Mission Duration: 9 days, 19 hours, 13 minutes, 57 seconds
Orbit Altitude: 173 nautical miles
Orbit Inclination: 51.6 degrees
Miles Traveled: 3.8 million


Kent V. Rominger, Commander
Rick D. Husband, Pilot
Ellen Ochoa, Mission Specialist
Tamara E. Jernigan, Mission Specialist
Daniel T. Barry, Mission Specialist
Julie Payette, Mission Specialist
Valery Ivanovicvh Tokarev, Mission Specialist

Launch Highlights

The originally scheduled launch of Discovery on May 20 was postponed because of hail damage sustained May 8 by the external tank while on the pad. It was determined that some of the tank’s foam insulation could not be reached for repairs with the orbiter on the pad. The orbiter was returned to the VAB, and inspections revealed more than 650 divots in the tank’s outer foam. Workers repaired about 460 critical divots over four days to minimize ice formation prior to launch. The countdown proceeded smoothly, with the only concern the presence of a sailboat in the solid rocket booster recovery area. As planned, launch managers determined the exact orbital location of the International Space Station during the countdown’s T-9-minute built-in hold. The decision was then made to launch Discovery at 6:49 a.m. EDT to achieve optimum shuttle system performance and to accommodate shuttle-space station docking activities.

Mission Highlights

All major objectives were accomplished during the mission. On May 29, Discovery made the first docking to the International Space Station (ISS). Rominger eased the shuttle to a textbook linkup with Unity’s Pressurized Mating Adapter #2 as the orbiter and the ISS flew over the Russian-Kazakh border.

The 45th space walk in space shuttle history and the fourth of the ISS era lasted 7 hours and 55 minutes, making it the second-longest ever conducted. Jernigan and Barry transferred a U.S.-built crane called the orbital transfer device, and parts of the Russian crane Strela from the shuttle’s payload bay and attached them to locations on the outside of the station. The astronauts also installed two new portable foot restraints that will fit both American and Russian space boots, and attached three bags filled with tools and handrails that will be used during future assembly operations. The cranes and tools fastened to the outside of the station totaled 662 pounds.

Once those primary tasks were accomplished, Jernigan and Barry installed an insulating cover on a trunnion pin on the Unity module, documented painted surfaces on both the Unity and Zarya modules, and inspected one of two Early Communications System (E-Com) antennas on the Unity.

During the incursion inside the ISS, Barry and Husband replaced a power distribution unit and transceiver for E-Com in the Unity module, restoring that system to its full capability. Payette and Tokarev replaced 18 battery recharge controllers in the Russian-built Zarya module, and Barry and Tokarev also installed a series of “mufflers” over fans inside Zarya to reduce noise levels in that module. The mufflers caused some air circulating duct work to collapse, and Rominger sent down a video inspection of the mufflers.

The crew transferred 3,567 pounds of material – including clothing, sleeping bags, spare parts, medical equipment, supplies, hardware and about 84 gallons of water – to the interior of the station. The astronauts also installed parts of a wireless strain gauge system that will help engineers track the effects of adding modules to the station throughout its assembly, cleaning filters and checking smoke detectors. Eighteen items weighing 197 pounds were moved from the station to Discovery for a return to Earth.

The astronauts spent a total of 79 hours, 30 minutes inside the station before closing the final hatch on the orbiting outpost. Rominger and Husband commanded a series of 17 pulses of Discovery’s reaction control system jets to boost the station to an orbit of approximately 246 by 241 statute miles. After spending 5 days, 18 hours and 17 minutes linked to the station, Discovery undocked at 6:39 p.m. EDT as Husband fired Discovery’s jets to move to a distance of about 400 feet for 2 1/2 lap flyaround. The crew used the flyaround to make a detailed photographic record of the ISS.

After the flyaround, mission specialist Payette deployed the STARSHINE satellite from the orbiter’s cargo bay. The spherical, reflective object entered an orbit two miles below Discovery. The small probe became instantly visible from Earth as part of a project allowing more than 25,000 students from 18 countries to track its progress.

Other payloads included the Shuttle Vibration Forces experiment and the Integrated Vehicle Health Monitoring HEDS Technology Demonstration.

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