INTERNATIONAL SPACE STATION
STATUS REPORT #99-28
10 a.m. CDT, Thursday, July 29, 1999
Mission Control Center, Houston, Texas
Flight controllers in Houston and Moscow spent a relatively quiet
systems on the International Space Station (ISS) as the orbiting outpost’s
continued to operate in excellent condition.
The focus of attention remained
on the conditioning of the six batteries in the Zarya
module and the “deep cycling” of the batteries to insure
that they will provide the
proper output of electricity. The “deep cycling” effort
involves the discharge and
recharge of each battery to maintain as long a life as possible for
the operation of ISS
Russian flight controllers
at the Russian Mission Control Center in Korolev, outside
Moscow, will conduct the battery discharge/recharge procedures periodically
throughout the lifetime of the station.
NASA flight controllers,
meanwhile, continued their analysis of a problem with the port
omni antenna on the Unity module used for a backup communications
the Early Communications System. The system, however, is working properly
the starboard antenna with no impact to operations or commanding to
the station. A
replacement antenna for the port side of Unity may be flown to the
ISS aboard Atlantis
in December during the next station resupply mission to the ISS on
Russian space officials
are considering adding a replacement battery to the manifest
for Atlantis on that same flight which would be installed by the crew
members in the
Zarya module. One of Zarya’s batteries is providing a slightly
different voltage output
than the other five, although it is operating satisfactorily.
The International Space
Station is oriented with Unity pointed toward the Earth and
Zarya pointed toward space in a slow spin to conserve propellent and
to maintain an
even temperature for both modules.
The ISS is flying in a slightly
elliptical orbit with a high point of 255 statute miles and a
low point of 237 statute miles, circling the Earth every 92 minutes.
The facility has
completed almost 4000 orbits of the Earth since the launch of Zarya
Shuttle launch updates, including the next visit of astronauts to
Space Station, are available on the Internet at:
Space Station viewing opportunities
for locations worldwide are available on the
Internet at: http://spaceflight.nasa.gov/realdata/sightings/
The next International Space
Station status report will be issued on August 5.
EDITORS NOTE: For further
information, please contact the NASA Public Affairs
Office at the Johnson Space Center, Houston, Texas, 281-483-5111.