Mars Exploration Rovers Update - November 30, 200
- From: baalke@xxxxxxxxxxxxx
- Date: Mon, 3 Dec 2007 11:42:13 -0800 (PST)
http://marsrovers.jpl.nasa.gov/mission/status.html
SPIRIT UPDATE: Spirit Breaks Free in Race for Survival - sol
1384-1389,
November 30, 2007:
In typical unflagging fashion, Spirit has managed to break free of
piles
of soil built up around the wheels in a low, sandy area that the
rover's
handlers have nicknamed "Tartarus," after a deep, underworld dungeon
in
Greek mythology. Team members are pulling out all the stops to get
Spirit to a winter location where, based on solar power projections,
the
rover has a chance at survival.
As the crow flies, that spot is 240.5 meters (130.8 feet) away. During
the next few weeks, Spirit's journey to "Winter Haven 3" is expected
to
be no less difficult, requiring the rover to maneuver across a sandy,
rocky valley along the western edge of "Home Plate."
During Spirit's 14 Martian days in Tartarus, the rover's trials were
reminiscent of those of the previous Martian winter, when Spirit spent
12 sols churning up white material in a sandy area while trying to
reach
the slopes of "McCool Hill."
Guided by experienced, interplanetary drivers, the robotic geologist
Spirit escaped Tartarus on sol 1388 (Nov. 28, 2007) and drove 3.43
meters (11.3 feet). This was a significant distance, given that
Spirit's
previous two drives were measured in centimeters (inches). The drive
took the rover south away from Tartarus to look for another path
around
the area before driving north once again.
Spirit's handlers will be working non-stop during the weekend to take
advantage of seasonal sunlight available for driving before solar
power
levels drop further. At present, the rover has about 310 watt-hours of
power each day (100 watt-hours is the amount of energy needed to light
a
100-watt bulb for one hour).
Sol-by-sol summary:
In addition to receiving morning instructions directly from Earth via
the high-gain antenna, sending evening data to Earth at UHF
frequencies
via the Odyssey orbiter, and measuring atmospheric dust levels with
the
panoramic camera, Spirit completed the following activities:
Sol 1384 (Nov. 24, 2007): Spirit managed to drive 6.98 meters (22.9
feet). The rover took post-drive images with the hazard avoidance
cameras and a mosaic of images with the navigation camera. The next
morning, Spirit measured atmospheric dust with the navigation camera
and
surveyed the sky and ground with the miniature thermal emission
spectrometer.
Sol 1385: Spirit spent the day recharging the battery. The following
morning, Spirit acquired movie frames in search of dust devils with
the
navigation camera and completed a survey of rock clasts with the
panoramic camera.
Sol 1386: Spirit drove only 0.25 meters (10 inches) and took images
with
the hazard avoidance cameras. The following morning, the rover
acquired
full-color images of Tartarus using all 13 filters of the panoramic
camera.
Sol 1387: Spirit drove only 0.14 meter (5.5 inches) and acquired
post-drive images with the navigation camera. The next morning, Spirit
surveyed atmospheric dust with the navigation camera and acquired
additional, full-color images of Tartarus with the panoramic camera.
Sol 1388: Spirit drove 3.43 meters (11.3 feet), finally breaking free
from the piles of soil built up around each of its wheels. The rover
acquired post-drive images with the hazard avoidance cameras.
Sol 1389 (Nov. 29, 2007): After a morning of surveying atmospheric
dust
and taking additional full-color images of Tartarus, plans called for
Spirit to complete a photo shoot with the navigation and hazard
avoidance cameras, survey atmospheric dust with the navigation camera,
and acquire thumbnail images of the sky with the panoramic camera.
Odometry:
As of sol 1388 (Nov. 28, 2007), Spirit's total odometry was 7438.82
meters (4.62 miles).
------------------------------------------------------------------------
OPPORTUNITY UPDATE: Multi-Tasking Rover Supports Multiple Missions -
sol 1361-1367, Nov 30, 2007:
Opportunity continues to investigate the rock exposure known as
"Smith2"
in the second of three bathtub ring-like layers of rock inside
"Victoria
Crater" as well as test communications for Phoenix, NASA's next
mission
to Mars. The rover is healthy and all subsystems are normal.
On Sol 1361 (Nov. 22, 2007), Opportunity performed diagnostic tests of
the shoulder joint that controls side-to-side movement of the robotic
arm, known as Joint 1. The joint had stalled on Sol 1359 (Nov. 20,
2007)
while the rover waas taking measurements with the microscopic imager.
The tests revealed no anomalous readings. Opportunity acquired the
rest
of the microscopic images of Smith 2 on Sol 1366 (Nov. 27, 2007).
After the diagnostic tests, Opportunity studied the elemental
chemistry
of Smith2 with the alpha-particle X-ray spectrometer and the
composition
and abundance of iron-bearing minerals in the outcrop with the
Moessbauer
spectrometer.
Working with NASA's Reconnaissance Orbiter, Opportunity successfully
tested UHF radio transmissions in support of entry, descent, landing,
and surface operations of the Phoenix mission, now en route to the red
planet. On Sol 1367 (Nov. 28, 2007), the rover and the orbiter used
the
international standard known as the Proximity-1 protocol for
spacecraft
data transfers.
Phoenix is expected to arrive at Mars on May 25, 2008. Radio signals
from Phoenix may also be receivable directly via the Robert C. Byrd
Green Bank Telescope in Virginia, the world's largest, fully steerable
radio telescope.
Sol-by-sol summary:
In addition to morning uplinks directly from Earth via the rover's
high-gain antenna, evening downlinks to Earth via the Odyssey orbiter
at
UHF frequencies, and standard measurements of atmospheric opacity
caused
by dust using the panoramic and navigation cameras, Opportunity
completed the following activities:
Sol 1361 (Nov. 22, 2007): Opportunity performed diagnostic tests of
the
robotic arm, placed the alpha-particle X-ray spectrometer on the
target
known as Smith2, and collected 6 hours of data with the instrument.
The
rover went into a mini-deep sleep and upon awakening the next morning,
scanned the sky for clouds with the navigation camera.
Sol 1362: Opportunity placed the Moessbauer spectrometer on Smith2 and
spent 10 hours collecting data with the instrument. The rover went
into
a mini-deep sleep and the next morning, searched for clouds with the
navigation camera.
Sol 1363: Opportunity restarted the Moessbauer spectrometer and
collected
12 hours of compositional data with the instrument. The rover acquired
a
mosaic of images that are part of a panoramic view of a light-toned
exposure of sedimentary rock known as "Pettijohn." The next morning,
the
rover scanned the sky for clouds with the navigation camera.
Sol 1364: Opportunity restarted the Moessbauer spectrometer and
collected
an additional 11 hours of compositional data from Smith2 with the
instrument. The rover scanned the sky for clouds with the navigation
camera.
Sol 1365: Opportunity restarted the Moessbauer spectrometer and
collected
12 hours of compositional data from Smith2 with the instrument. The
rover acquired "Part 3" of the panoramic-camera mosaic of Pettijohn.
Sol 1366: Opportunity switched tools from the Moessbauer spectrometer
to
the microscopic imager and acquired microscopic images looking up at
the
sky for calibration purposes. The rover also took external images of
the
microscopic imager with the hazard avoidance cameras. Opportunity then
acquired stereo microscopic images of Smith2. Opportunity switched
tools
from the microscopic imager to the rock abrasion tool and acquired
"Part
4" of the Pettijohn panorama. The next morning, Opportunity scanned
the
sky for clouds with the navigation camera, surveyed the horizon with
the
panoramic camera, and took spot images of the sky with the panoramic
camera.
Sol 1367 (Nov. 28, 2007): Plans called for Opportunity to scan the sky
for clouds with the navigation camera and take thumbnail images of the
sky with the panoramic camera.
Odometry:
As of sol 1366 (Nov. 27, 2007), Opportunity's total odometry remained
at
11,584.32 meters (7.2 miles), where the rover has been stationed since
the last drive on Sol 1329 (Oct. 20, 2007).
.
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