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UPDATE # 51 - September 4, 1997

PART 1: RSVP for September 12 WebChat
PART 2: Special Back-to-School Edition Next Week
PART 3: New Fall LFM Program
PART 4: NASA to Rebroadcast PTK/LFM Programs
PART 5: Mars Global Surveyor Flight Status
PART 6: Subscribing & Unsubscribing: How to do it!


RSVP FOR SEPTEMBER 12 WEBCHAT

Everybody's favorite, Ken Edgett from Arizona State University, will be
our guest for the Friday, September 12 WebChat from 9-10 a.m., Pacific.

Be sure to attend as next week is a big week for Mars Global Surveyor. On
Sept. 9 MGS pressurizes its tanks for the orbit insertion burn on Sept.
11. Ken will be overflowing with exciting new information for us.

In addition to being a planetary geologist and affiliated with the Thermal
Emission Spectrometer instrument onboard MGS, Ken is also the director of
the Arizona Mars K-12 Education Program. This promises to be a full chat,
so register early!



SPECIAL BACK-TO-SCHOOL EDITION NEXT WEEK

To welcome you to the new school year with Live From Mars, next week you
will receive a special back-to-school edition of LFM Updates. It will
contain an overview of the many learning opportunities available from the
LFM Project.



NEW FALL LFM PROGRAMS

Two new one-hour Live From Mars programs will be broadcast this fall. "LFM
4: Destination Mars" will be aired Thursday, October 30, 1 p.m., Eastern.
"LFM 5: Today on Mars" is scheduled for Thursday, November 13, 1 p.m.,
Eastern.

"Destination Mars" is on tape (not live) and will replay the highlights of
the two, one-hour '96-'97 specials and the two, two-hour summer specials.
The tape will also contain at least three new segments: an update of
Pathfinder's first weeks/months on Mars, including a "guided tour" of the
landing site; a guide to LFM Web resources; and a report on Global
Surveyor's Mars Orbit Insertion and first few weeks in orbit.

"Today on Mars" will include the first science from Mars Global Surveyor
(MGS). This live program will feature results from an online collaborative
activity designed to engage students in measuring weather locally to
compare and contrast results with those obtained from Pathfinder and MGS.
The program, last in the currently planned series of Live From Mars
specials, will also point to ways in which students and teachers can use
the Internet to follow MGS's primary mapping mission (March 98) and other
upcoming NASA Mars missions, beginning with Surveyor '98.

Broadcast details will be published as soon as they are known.



NASA TO REBROADCAST PTK/LFM PROGRAMS

If you do not have access to the first two Live From Mars programs, now is
the perfect time to record/watch them! Remember, the LFM Teacher's Guide
provides you with a series of recommended hands-on activities to implement
prior to student viewing. The Teacher's Guide can be found at:
http://quest.arc.nasa.gov/mars/teachers/learning.html

September 19
Live From Mars Program I "Countdown" (rebroadcast of live performance)
Level: Grades 4-12
Length: 57:30

"Countdown" introduces a new series of Passport to Knowledge electronic
field trips. Live From Mars Program I takes students behind closed doors
at Cape Canaveral to see NASA's Pathfinder spacecraft close-up, just days
before its successful early December '96 launch, and invites students and
teachers to follow Pathfinder and Mars Global Surveyor online via the
Internet and with hands-on discovery activities throughout the next two
school years.

September 22
Live From Mars Program II: "Cruising Between the Planets"
Level: Grades 4-12
Length: 60:00

This program offers a behind-the-scenes report at NASA's Jet Propulsion
Lab, the lead center for planetary exploration. It begins with how rocket
fuel, momentum, gravity and ingenuity get spacecraft from Earth to Mars
and reports on the progress of Pathfinder and Global Surveyor. Portraits
of the men and women who control the missions and who built and tested the
robotic rover, Sojourner are also included. The video concludes with
highlights of hands-on student activities such as the LFM Planet Explorer
Toolkit, the Egg Drop Challenge, and Red Rover, Red Rover.

Programs are broadcast at the following times:
2-3 p.m., 5-6 p.m., 8-9 p.m., 11 p.m.-12 a.m., 2-3 a.m. All times Eastern.
NASA TV may preempt scheduled programming for live agency events.

NASA-TV coordinates can be found at:
GE-2, Transponder 9C at 85 degrees west longitude, vertical polarization,
with a frequency of 3880 MHz, and audio of 6.8 MHz.



MARS GLOBAL SURVEYOR FLIGHT STATUS

[Editor's note: This status report was prepared by the Office of the
Flight Operations Manager, Mars Surveyor Operations Project, NASA Jet
Propulsion Laboratory.]

August 29, 1997

Mars Global Surveyor continues to perform excellently as it continues on a
path that will reach the red planet just under two weeks from now. The
spacecraft is currently 3.56 million kilometers from Mars and is closing
that gap at rate of  247,000 km per day.

On Monday at 9:30 a.m. PDT, the onboard flight computer commanded
Surveyor's small rocket thrusters to fire for 12 seconds. Eric Gratt of
the navigation team reports that this tiny burn altered the velocity by
0.29 meters per second and was performed to make
final, pre-arrival adjustments to Surveyor's flight path. Specifically,
the maneuver altered the tilt of the spacecraft's flight path with respect
to the Martian north pole by 3.3 degrees.

Monday's maneuver was the last in a series of four trajectory correction
maneuvers designed to refine the spacecraft's flight path to Mars. The
first maneuver occurred shortly after launch in November 1996, the second
occurred in March 1997, and the third was canceled by chief navigator Dr.
Pat Esposito because it was not needed.

Today, the flight team transmitted the T1 command sequence to Surveyor.
This sequence will activate on Tuesday, September 2 at 7:00 a.m. PDT, and
contains commands that will ultimately control the spacecraft during the
Mars orbit insertion burn on September 11. In the unlikely event that
communications is lost before arrival, Surveyor now possesses the ability
to enter Mars orbit without any further instructions from mission control.

In other news, some of the long-range images of Mars obtained by the
camera last week have been placed on the Surveyor web site. The camera
team, led by Dr. Michael Malin, is currently processing the other images.
These remaining images will be placed on the web site shortly after they
are released at a press conference on Tuesday, September 9. The URL to
download the images is:

http://mgsw3.jpl.nasa.gov/sci/images/img_current.html

After a mission elapsed time of 295 days from launch, Surveyor is 240.69
million kilometers from the Earth and is moving in an orbit around the Sun
with a velocity of 21.92 kilometers per second. This orbit will intercept
Mars 13 days from now, slightly after 6:00 p.m. PDT on September 11 (01:00
UTC, September 12). The spacecraft is currently executing the C11 command
sequence, and all systems continue to be in excellent condition.



SUBSCRIBING & UNSUBSCRIBING: HOW TO DO IT!

If this is your first message from the updates-lfm list, welcome!

To catch up on back issues, please visit the following Internet URL:
http://quest.arc.nasa.gov/mars/updates

To subscribe to the updates-lfm mailing list (where this message
came from), send a message to:
   listmanager@quest.arc.nasa.gov
In the message body, write these words:
   subscribe updates-lfm

CONVERSELY...

To remove your name from the updates-lfm mailing list, send a
message to:
   listmanager@quest.arc.nasa.gov
In the message body, write these words:
   unsubscribe updates-lfm

If you have Web access, please visit our "continuous construction"
site at http://quest.arc.nasa.gov/mars

credits
 
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