Daily                News
Wednesday, June 30, 1993  Two Independence Square;
Washington, D.C.  Audio Service:202/358-3014


 % Unfavorable weather delays Endeavour's landing;
 % Planetary Mission update;
 % STS-51 pre-flight briefings set for July 6, 1993.


Unfavorable weather conditions have delayed the landing of Space
Shuttle Endeavour yet another day.  Landing is now scheduled for
tomorrow at 8:53 a.m.  EDT at the Kennedy Space Center.  If weather
conditions should prove unsuitable at Kennedy, Endeavour's landing will
be at the back-up facilities at Edwards Air Force Base, California.

* * * * * * * * * * * * * * * *

En route to Jupiter, the Galileo spacecraft is scheduled to orbit the
planet on December 7, 1995.  On August 28, 1993, the spacecraft will
fly by the asteroid Ida.  The spacecraft's performance and condition
are excellent with the exception of the high gain antenna being only
partially deployed.  The science and engineering data are being
transmitted via the low gain antenna.

The Ulysses spacecraft is continuing to gather data on the heliosphere,
the realm dominated by the solar wind, a stream of charged particles
flowing from the Sun.  Ulysses is in a highly inclined solar orbit in
transit from its Jupiter gravity assist in February, 1992.  The
spacecraft's condition and performance are excellent.

As for Voyager 1 and 2, the two spacecraft are continuing their
interstellar mission.  They have remotely detected the heliopause, the
boundary between the solar magnetosphere and interstellar space, last
month.

* * * * * * * * * * * * * * * *

The STS-51 preflight briefings will be held on July 6 at the Johnson
Space Center.  The briefings are scheduled to begin at 10:00 a.m. EDT
and continue until late afternoon.

Space Shuttle Discovery's STS-51 mission will feature the deployment of
the Advanced Communications Technology Satellite (ACTS) as well as the
deployment and retrieval of the Orbiting and Retrievable Far and
Extreme Ultraviolet Spectrometer (ORFEUS).  Once ACTS is deployed, it
will be placed in a geostationary orbit by the

Transfer Orbit Stage  where it is to be used as a space- based testbed
for new satellite communications technology.  The ORFEUS will gather
information on how stars are formed and will study properties of the
interstellar medium during its  week-long free-flight.

The briefings will be broadcast live on NASA TV with two-way audio for
questions from participating NASA locations.

* * * * * * * * * * * * * * * *


Here's the broadcast schedule for Public Affairs events on NASA TV.
Note that all events and times may change without notice and that all
times listed are Eastern.


NASA TV will provide continuous coverage of the STS-57 mission from
lift-off to landing.


The editor is  Sonja Maclin  on  202/358-1761 or SMACLIN on NASAmail.
NASA TV is carried on GE Satcom F2R, transponder 13, C-Band, 72 degrees
West Longitude, transponder frequency is 3960 MHz, audio subcarrier is
6.8 MHz, polarization is vertical.