This is NASA Headline News for Wednesday, September 11, 1991 . . .

Discovery, the Upper Atmosphere Research Satellite, and the
STS-48 five-member crew are ready for liftoff tomorrow at 6:57
pm EDT for the STS-48 mission, according to KSC test director Al
Sofge.  The launch window's  favorable weather forecast appears to be
holding fast with only a slight probability of thunderstorms in the
launch pad vicinity.  The probability of good weather for the duration
of the window is 90 percent.  Tanking preparations for loading liquid
hydrogen and liquid oxygen into Discovery's external tank get
underway late this evening.  Tanking begins tomorrow morning at
10:37 am.  The crew will enter Discovery tomorrow at 4:12 pm.

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Associate Administrator for Space Science and Applications, Dr.
Lennard Fisk, yesterday named Dr. Dirk D. Frimout as payload
specialist for the ATLAS-1 spacelab mission, now set for flight
early next year.  ATLAS (Atmospheric Laboratory for Applications
and Science) missions are scheduled to fly over the next 11 years to
study the interaction of the Earth's atmosphere with the Sun, and are
an element of NASA's Mission to Planet Earth program.  Frimout
replaces Michael K. Lampton, who became disqualified for flight for
medical reasons.  Lampton will remain with the mission team and
serve as alternate payload specialist.

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NASA will host a science writer's workshop on the Mission to
Planet Earth and the Earth Observing System tomorrow
morning at Kennedy Space Center.  The workshop is intended to
complement briefings occurring today on the Upper Atmosphere
Research Satellite.  UARS is the first of a series of spacecraft to be
launched which constitute the space element of the Mission to Planet
Earth program.  The workshop will feature NASA science chief Dr. Len
Fisk, Earth science director Dr. Shelby Tilford, and EOS project
scientists and managers.  The briefings begin at 10:00 am and last
through noon.

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Marshall Space Flight Center reports that their on-line
computerized aerospace data base for educators -- Spacelink -- was
accessed 6,667 times last month, the second highest monthly
tally since the service began.  More than 26,000 Spacelink files
were read by those accessing the service, which maintains files on
historic as well as current NASA programs.


Here's the broadcast schedule for Public Affairs events on
NASA Select TV.  Note that all events and times may change
without notice, and that all times listed are Eastern.
indicates a program is transmitted live.

Wednesday, September 11, 1991
     11:30 am  STS-48 management pre-launch press briefing from KSC.
     1:30 pm  Protein Crystal Growth experiment briefing from KSC.
     2:00 pm  Commercial programs activities briefing from KSC.
      Continuous coverage of mission activities for STS-48 begins.
Thursday, Sept. 12, 1991
     6:57 pm  Scheduled launch of Discovery for STS-48 mission.
     7:30 pm  Launch engineering replays.
     8:00 pm  Post-launch press conference.
     11:42 pm  UARS payload review.
Friday, September 13, 1991
    1:00 am  Launch replays.
    3:00 am  Replay of Flight Day 1 activities.
     6:30 am  Mission status briefing with flight director Rob Kelso.
    12:00 pm  Replay of Flight Day 1 activities.
Saturday, September 14, 1991
     2:00 am  Mission status briefing with flight director Al Pennington.
    4:00 am  Replay of Flight Day 2 activities.
    12:00 pm  Replay of Flight Day 2 activities.
     6:37 pm  UARS grapple.
     7:34 pm  UARS moved to low hover.
     8:17 pm  UARS solar array deploy.
     8:39 pm  Robot arm maneuver to deploy attitude.
     8:57 pm  UARS solar array rotation.
    11:33 pm  UARS release (not televised live).
Sunday, September 15, 1991
    1:57 am  Videotape replay of UARS release.
     2:00 am  Mission status briefing with flight director Al Pennington.
    2:30 am  Videotape replay of UARS release.
    6:00 am  Replay of Flight Day 3 activities.
    12:00 pm  Replay of Flight Day 3 activities.
Monday, September 16, 1991
     2:00 am  Mission status briefing with flight director Al Pennington.
    7:00 am  Replay of Flight Day 4 activities.
    12:00 pm  Replay of Flight Day 4 activities.
     10:07 pm  Larry King Radio interview voice checks.
     11:37 pm  Larry King Radio show unilateral interview.
Tuesday, September 17, 1991
     2:00 am  Mission status briefing with flight director Al Pennington.
     2:27 am  MODE experiment operations.
    7:00 am  Replay of Flight Day 5 activities.
    12:00 pm  Replay of Flight Day 5 activities.
    11:44 pm  Deorbit maneuver (not televised).
Wednesday, September 18, 1991
     1:55 am  Scheduled landing of Discovery at KSC.
    TBD  Landing replays.
    TBD  Post-landing press conference.
    TBD  Astronaut departure KSC for JSC.

This report is filed daily at noon, Monday through Friday.  It is
a service of NASA's Office of Public Affairs.  The editor is
Charles Redmond, 202/453-8425 or CREDMOND on NASAmail.
NASA Select TV is carried on GE Satcom F2R, transponder 13,
C-Band, 72 degrees West Longitude, transponder frequency is
3960 MegaHertz, audio subcarrier is 6.8 MHz, polarization is
vertical.