For the second time in less than a month, two Russian cosmonauts will venture outside the International Space Station on Feb. 16 to install a pair of earthquake and lightning sensing experiments, and to retrieve a pair of spacecraft material evaluation panels.
Expedition 26 Flight Engineers Dmitry Kondratyev and Oleg Skripochka are scheduled to float outside the Pirs airlock at 8:15 a.m. EST Wednesday to begin the five-and-a-half-hour excursion. Both spacewalkers will wear Russian Orlan-MK spacesuits.
On their previous spacewalk, completed Jan. 21, they completed installation of a new high-speed data transmission system, removed an old plasma pulse experiment, installed a camera for the new Rassvet docking module and retrieved a materials exposure package. That spacewalk lasted 5 hours, 23 minutes.
Kondratyev again will be designated as Extravehicular 1 (EV1), with a red stripe on his suit, and Skripochka will be EV2, with a blue stripe on his suit. This time, both cosmonauts will wear NASA-provided helmet lights and wireless television cameras to provide live point-of-view video to Mission Control-Moscow, which will provide ground support for the spacewalk. Mission Control-Houston will monitor the spacewalk as well.
The spacewalk will focus on installation of two scientific experiments outside the Zvezda service module. The first is called Radiometria, and is designed to collect information useful in seismic forecasts and earthquake predictions. Radiometria will be installed on a portable workstation on the port side of the large-diameter section of the Zvezda module. The second is Molniya-Gamma, which will look at gamma splashes and optical radiation during terrestrial lightning and thunderstorm conditions using three sensors. The Molniya-Gamma will be installed on a portable workstation on the starboard side of the Zvezda module.
Kondratyev and Skripochka also will retrieve two Komplast panels from the exterior of the Zarya module. The panels contain materials exposed to space, and are part of a series of international experiments looking for the best materials to use in building long-duration spacecraft. Additionally, they will remove and jettison a space suit foot restraint.
As during the previous spacewalk, Commander Scott Kelly and Flight Engineer Alexander Kaleri will climb into their Soyuz 24 spacecraft, which is docked to the Poisk module on the opposite side of Zvezda from the airlock, and seal the hatches between Zvezda and Poisk. This protects against the unlikely possibility of a sudden station depressurization and also allows for the use of the forward portion of Zvezda as a backup airlock if necessary. Flight Engineers Cady Coleman and Paolo Nespoli will be in the U.S. segment and will have access to their Soyuz 25 spacecraft, which is docked to the Rassvet module adjacent to Pirs on the Zarya control module, therefore they do not need to be sequestered.
With all tasks complete, Kondratyev and Skripochka will re-enter the Pirs airlock and end their spacewalk.
The next Russian spacewalk is planned for July by Expedition 28 Commander Andrey Borisenko and Flight Engineer Sergei Volkov.