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UPDATE # 29 - April 11, 1997

PART 1: Take the Challenge!
PART 2: How to View a NASA TV Broadcast
PART 3: Global Surveyor Flight Status
PART 4: Pathfinder Mission Status
PART 5: Subscribing & Unsubscribing: How to do it!


Due to an error in how CQ#3 was transcribed last week, it has been
rewritten and reposted. Your kids have a second opportunity to
answer it.

Discount (ignore, forget about...) one feature that makes Earth unique
among the planets (but maybe not the moons) of our solar system,
and Earth and Mars are almost identical in a certain aspect.

What do you have to take away from Earth?
In what way are Earth and Mars then alike?

Bonus question: Whatever do we mean when we say this feature may
make Earth unique compared to the planets...but maybe not "the
moons" of our solar system?

Send your answers to jwee@quest.arc.nasa.gov. They will be
accepted through next Wednesday, April 16.

Olympus Mons is the highest feature on Mars. What is its counterpart
on Earth? Be forewarned: it is not Mount Everest!

Bonus Question:
If you think about how astronomers measure the height of features
on Mars, you'll have a clue to help this question. What do we mean?

You are invited to send original student answers to:
jwee@mail.arc.nasa.gov. Please include the words CHALLENGE
QUESTION in the subject line of your email. The kids' names will be
listed online and token prizes will be given to those will the best

Answers are due within seven full days of Challenge Question
posting. (e.g. If a CQ is posted on April 11, answers are due by
midnight PST on April 18.)

A list of answers from all students who submitted them will be
posted on the Live From Mars Web site soon.

How to View a NASA TV Broadcast

Live From Mars programs are broadcast *live* via both NASA-TV and PBS' main satellite, Telstar 402. "Cruising Between the Planets" will air at 1-2 pm EST on Thursday, April 24. You have two options for downlinking the program via satellite: 1) NASA-TV satellite coordinates on C-Band. NASA TV may preempt scheduled programming for live agency events. Effective March 15, 1997, the NASA TV satellite changed to: - GE-2 - transponder 9C at 85 degrees West longitude - vertical polarization - frequency of 3880 Mhz and audio of 6.8 Mhz. 2): Satellite coordinates for Ku-Band PBS carriage: - Telstar 402 R - 7 Lower - 89 degrees West - frequency 11895 vertical - 6.2 and 6.8 audio Also, your local PBS station may be carrying the Live From Mars programs live or via tape delay. Call your local PBS station and inquire about their plans. Each PBS station (education coordinator) receives LFM background information. If they are not aware of the PTK programming and are interested in more information, they may call the PTK Office at 908-273-4108. Our office can fax them details if they are missing key information! Educators without satellite dish access or lack local PBS feeds should not give up! Call your local cable company and see if they can help access the feed. Check with a local higher education agency; many of these folks have satellite dishes and may be willing to tape the program for you. How about a parent with a dish? Many PTK participating educators have told inspiring stories of how they creatively acquired our programming. PTK does make available copies of the programs within one week of the live telecast for a nominal charge. Contact Jan Wee for further details: jwee@mail.arc.nasa.gov


[Editor's note: This status report was prepared by the Office of the Flight Operations Manager, Mars Surveyor Operations Project, NASA Jet Propulsion Laboratory.] 4 April, 1997 On Saturday, March 29, the flight team performed a several-hour communications test to measure low-level interference between Surveyor's ultra-stable-oscillator-generated X-band signal and the Ka-band signal. Normally, the spacecraft utilizes the 25-watt, X- band transmitter for communicating with the Earth. The main differences between the two are that the 1-watt, Ka-band transmitter is experimental and operates at a frequency near 32 GigaHertz versus 8 GigaHertz for X-band. During last Saturday's test, the spacecraft simultaneously activated both the X- and Ka-band signal sources. The test was designed to determine the effect of the Ka-band signal on the purity of the X- band signal as generated by the ultra-stable oscillator. Understanding the performance of the oscillator under potential interference conditions is important because this device functions as an electronic clock that precisely controls the tone of Surveyor's radio signal. Precision control of the signal's tone is important for gathering data regarding the Martian atmosphere. On Monday, March 31, the spacecraft passed through a major milestone on its way to Mars. For the first time in the mission, Surveyor was closer to Mars than to Earth. This equi-distant point was approximately 57 million kilometers between the two planets. The half-way point measured in terms of days to reach Mars will occur on April 10. After a mission-elapsed time of 148 days from launch, Surveyor is 61.05 million kilometers from the Earth, 53.20 million kilometers from Mars, and is moving in an orbit around the Sun with a velocity of 25.36 kilometers per second. This orbit will intercept Mars on September 12, 1997. The spacecraft is currently executing the C6 command sequence, and all systems continue to be in an excellent condition.


[Editor's note: This status report was prepared by the Office of the Flight Operations Manager, Mars Pathfinder Mission, NASA Jet Propulsion Laboratory.] 4 April 1997 The spacecraft remains in good health and is currently about 64 million kilometers from Earth. The most significant spacecraft activity performed this week was to switch to a new convolutional code, K=15, Rate 1/6, on our downlink. This code gives us a significant increase in our downlink capability. Mars Pathfinder is the first spacecraft to operationally use this code with the Deep Space Network and we are very pleased with the results. The project conducted a meeting to discuss flight software changes for Entry, Descent and Landing and Surface phases of the mission. These changes are to correct bugs found during testing performed since launch. We expect to finalize these changes and prepare for loading them onboard within the next two months.


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


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