Live in Orbit: Productive second spacewalk ends

Discovery astronauts Danny Olivas and Christer Fuglesang have completed a productive day of work outside the International Space Station.

They installed a new ammonia coolant tank on the station's backbone and stored the tank that it replaced in the space shuttle's payload bay, work that provided soaring views for Fuglesang as he ferried the tanks on the end of the station's robotic arm.

With some time left over, Fuglesang attached some covers to cameras on the end of that 58-foot arm.

Olivas started to connect some heater cables to a docking port that NASA's Tranquility module will use next year, but discovered they weren't in the order expected.

Ground teams waved off the task until the next spacewalk, when it was originally planned, so they could study it further.

The duo also installed a mechanisms for attaching a foot restraint on the station's truss, and a grapple fixture on an ammonia tank that will be removed from the starboard side of the truss next year.

All the work took 6 hours and 39 minutes. It got under way at 6:12 p.m. Thursday and ended at 12:51 a.m. Friday.

The spacewalk was the fourth for both Olivas and Fuglesang, who will team up again Saturday for their fifth spacewalks. It was second of Discovery's STS-128 mission and the 132nd supporting station assembly and maintenance.

Here are the total accumulated spacewalking times for each:
++ Olivas: 27 hours and 27 minutes.
++ Fuglesang: 24 hours and 53 minutes.
++ STS-128 mission: 13 hours and 14 minutes.
++ Space station assembly/maintenance: 823 hours 50 minutes.