[meteorite-list] Spirit Drives to a Rock Called 'Adirondack' for Close Inspection

From: Sterling K. Webb <kelly_at_meteoritecentral.com>
Date: Thu Apr 22 10:32:04 2004
Message-ID: <400DE1E1.CA05E6B4_at_bhil.com>

     Hi,

         Does anybody remember the "Pyramids of Elysium" from the
     Viking Orbiter images? These were 500 to 800 meter three-sided
     steep hills clustered in one location. Naturally, there was a
     "school of thought" that claimed them as Ancient Alien
     Artifacts, great pyramids build by the... yada, yada, yada.
         They were ventifacts, of course. The same thing occurs
     with lots of small hills in the deserts of Chile. They look
     like they might be pyramids, but close up, they are just
     hills.
         Since all the rocks around Spirit are not shaped like
     this, either a) this one is older, or b) this one is softer,
     or c) this one came from a different location as most of the
     other rocks in the neighborhood.


     Sterling
     ----------------------------------------------------------------------

     Dan Wray wrote:

          Hello Thomas and group,

          Adirondack and many other rocks in the rover photos
          appear to be altered by wind erosion. This can leave
          very sharp faces and are known as ventifacts. Other
          terms used for this effect are dreikanter also
          windkanter. Seasonal changes in wind direction can
          cause two or three distinct planes on the rock
          surface. They are common in windy desert
          environments.

          Dan Wray

          COMETS

               ----- Original Message -----

               From: Thomas Webb

               To: Ron Baalke

               Cc: meteorite-list_at_meteoritecentral.com

               Sent: Tuesday, January 20, 2004 7:35 AM

               Subject: Re: [meteorite-list] Spirit
               Drives to a Rock Called 'Adirondack' for
               Close Inspection



               Ron and List,

               Does it appear to you that there may have
               been some shearing on the right hand side
               of the rock called 'Adirondack'?

               Thomas H. Webb

               Ron Baalke <baalke_at_zagami.jpl.nasa.gov>
               wrote:



                    Guy Webster (818) 354-5011
                    Jet Propulsion Laboratory,
                    Pasadena, Calif.

                    Donald Savage (202) 358-1547
                    NASA Headquarters, Washington,
                    D.C.

                    News Release: 2004-024 January
                    19, 2004

                    Spirit Drives to a Rock Called
                    'Adirondack' for Close
                    Inspection

                    NASA's Spirit rover has
                    successfully driven to its first
                    target on
                    Mars, a football-sized rock that
                    scientists have dubbed
                    Adirondack.

                    The Mars Exploration Rover
                    flight team at NASA's Jet
                    Propulsion
                    Laboratory, Pasadena, Calif.,
                    plans to send commands to Spirit
                    early
                    Tuesday to examine Adirondack
                    with a microscope and two
                    instruments
                    that reveal the composition of
                    rocks, said JPL's Dr. Mark
                    Adler,
                    Spirit mission manager. The
                    instruments are the Mössbauer
                    spectrometer and the alpha
                    particle X-ray spectrometer.

                    Spirit successfully rolled off
                    the lander and onto the martian
                    surface last Thursday. To make
                    the drive to Adirondack, the
                    rover
                    turned 40 degrees in short arcs
                    totaling 95 centimeters (3.1
                    feet).
                    It then turned in place to face
                    the target rock and drove four
                    short
                    moves straightforward totaling
                    1.9 meters (6.2 feet). The moves

                    covered a span of 30 minutes on
                    Sunday, though most of that was
                    sitting still and taking
                    pictures between moves. The
                    total amount
                    of time when Spirit was actually
                    moving was about two minutes.

                    "These are the sorts of baby
                    steps we're taking," said JPL's
                    Dr.
                    Eddie Tunstel, rover mobility
                    engineer.

                    "The drive was designed for two
                    purposes, one of which was to
                    get to
                    the rock," Tunstel said. "From
                    the mobility engineers'
                    standpoint,
                    this drive was geared to testing
                    out how we do drives on this new

                    surface." Gathering new
                    information such as how much the
                    wheels
                    slip in the martian soil will
                    give the team confidence for
                    more
                    ambitious drives in future weeks
                    and months.

                    "Adirondack is now about one
                    foot (30 centimeters) in front
                    of the
                    front wheels," he said.

                    Scientists chose Adirondack to
                    be Spirit's first target rock
                    rather
                    than another rock, called
                    Sashimi, that would have been a
                    shorter,
                    straight-ahead drive. Rocks are
                    time capsules containing
                    evidence of
                    the environmental conditions of
                    the past, said Dr. Dave Des
                    Marais,
                    a rover science-team member from
                    NASA Ames Research Center,
                    Moffett
                    Field, Calif. "We needed to
                    decide which of these time
                    capsules to
                    open."

                    Sashimi appears dustier than
                    Adirondack. The dust layer could

                    obscure good observations of the
                    rock's surface, which may give
                    information about chemical
                    changes and other weathering
                    from
                    environmental conditions
                    affecting the rock since its
                    surface was
                    fresh. Also, Sashimi is more
                    pitted than Adirondack. That
                    makes it a
                    poorer candidate for the rover's
                    rock abrasion tool, which
                    scrapes
                    away a rock's surface for a view
                    of the interior evidence about
                    environmental conditions when
                    the rock first formed.
                    Adirondack has
                    a "nice, flat surface" well
                    suited to trying out the rover's
                    tools
                    on their first martian rock, Des
                    Marais said.

                    "The hypothesis is that this is
                    a volcanic rock, but we'll test
                    that
                    hypothesis," he said.

                    Spirit arrived at Mars Jan. 3
                    (EST and PST; Jan.
                    4 Universal Time) after a
                    seven-month journey. In coming
                    weeks and months,
                    according to plans, it will be
                    exploring for clues in rocks and

                    soil to decipher whether the
                    past environment in Gusev Crater

                    was ever watery and possibly
                    suitable to sustain life.

                    Spirit's twin Mars Exploration
                    Rover, Opportunity, will reach
                    Mars
                    on Jan. 25 (EST and Universal
                    Time; 9:05 p.m., Jan. 24, PST)
                    to
                    begin a similar examination of a
                    site on the opposite side of the

                    planet from Gusev Crater.

                    JPL, a division of the
                    California Institute of
                    Technology in
                    Pasadena, manages the Mars
                    Exploration Rover project for
                    NASA's
                    Office of Space Science,
                    Washington, D.C. Images and
                    additional
                    information about the project
                    are available from JPL at

                    http://marsrovers.jpl.nasa.gov

                    from Cornell University, Ithaca,
                    N.Y., at

                    http://athena.cornell.edu/ .
                    -end-
Received on Tue 20 Jan 2004 09:20:18 PM PST


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