STS-93
Report # 11 
Tuesday, July 27, 1999, 4 p.m. CDT 
 
  Columbia^s astronauts made final preparations Tuesday evening to
come home after a successful five-day flight. Commander Eileen
Collins, Pilot Jeff Ashby and Mission Specialists Cady Coleman, Steve
Hawley and Michel Tognini were awakened at 2:31 p.m. CDT Tuesday to
&quot;A Little Traveling Music&quot; by Barry Manilow, requested by
Hawley^s wife Eileen, and &quot;The Air Force Song,&quot; played
for Collins and Coleman.

  The first major task will be the closing of Columbia^s cargo bay
doors at about 6:40 this evening, followed by the astronauts climbing
into their launch and entry suits shortly before 8 p.m.  The entry
flight control team led by Flight Director John Shannon will receive
updated weather forecasts throughout the late afternoon and evening
before a &quot;go-no go&quot; decision for the deorbit burn is issued
around 9 p.m.

  There are two opportunities to land Tuesday night.  The first begins
with a deorbit burn on orbit 79 at 9:19 p.m. with a landing at 10:20
p.m. at Kennedy Space Center Florida.  Columbia^s orbital
maneuvering engines will fire, slowing the 100-ton spacecraft by 250
feet per second, enough to drop it into the atmosphere halfway around
the world.  Columbia^s unpowered glide through the atmosphere will
heat a plasma layer around the heat-protecting tiles and creating a
brilliant streak across the night sky for many ground observers.  The
Orbiter will cross Baja California and northwest Mexico, bisect Texas
from west to east and pass over southern Louisiana on its way to
Florida.  Weather permitting, ground observers will be able to see the
entry path about 100 miles on each side of the track.  Columbia will
cross Texas between 10 and 10:05 p.m. and a few minutes later will
overfly Louisiana.  Present plans call for a right turn to line up
with runway 33, a southeast to northwest !  landing.

The second opportunity is one orbit later with an engine firing at
10:54 p.m. CDT and a landing at KSC at 11:55 p.m.  The groundtrack is
similar to the previous orbit^s entry path.

Edwards Air Force Base will not be called up for support Tuesday night
because of the good chances for landing at KSC.

Flight controllers will be keeping an eye on the weather in Florida.
The primary threat to ending Columbia^s mission at the Shuttle
Landing Facility there is the possibility of thunderstorms within 30
miles, most likely to the west.  Winds and cloud cover were not a
concern leading up to the engine firing.

If Columbia lands at Kennedy Space Center it will be the 12th night
landing in the Shuttle program^s history.  Five of those have been
at Edwards Air Force Base in California and the rest have been at KSC.
There have been 18 consecutive landings at KSC and 25 of the last 26
have been there.  The last Edwards landing was in March 1996 with the
STS-76 mission.

Additional opportunities for landing will be available on Wednesday at
both landing sites if weather prevents Columbia from coming home
tonight.

If Columbia lands this evening, the astronauts are due back at
Ellington Field in Houston around mid-morning on Wednesday. An exact
time for crew arrival will be firmed up after landing.

Columbia is orbiting the Earth every 90 minutes at an altitude of 179
statute miles with all systems operating normally.

The next STS-93 status report will be issued tonight after landing, or
as developments warrant.

 - end -

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