[meteorite-list] Mars Exploration Rover Update - August 8, 2007

From: Ron Baalke <baalke_at_meteoritecentral.com>
Date: Thu, 9 Aug 2007 08:28:59 -0700 (PDT)
Message-ID: <200708091528.IAA23827_at_zagami.jpl.nasa.gov>

http://marsrovers.jpl.nasa.gov/mission/status.html

SPIRIT UPDATE: Martian Dust Begins to Settle -- Right on Top of the
Solar Arrays - sol 1268-1273, August 8, 2007:

Spirit is healthy and continues to ride out the dust storms on Mars. In
fact, atmospheric dreariness has improved in the last few Martian days,
or sols, but as dust settles out of the atmosphere, it settles onto the
solar arrays, keeping power levels relatively low.

Measurements of the amount of sunlight blocked from reaching the rover,
known as Tau, dropped from a record high of 4.738 on sol 1265 (July 25,
2007) to 3.813 on sol 1273 (Aug. 2, 2007). Solar power levels leveled
off at around 260 to 300 watt-hours per sol (100 watt-hours is the
amount of energy needed to light a 100-watt bulb for one hour).

Weather reports from the Mars Color Imager on the Mars Reconnaissance
Orbiter indicate the storms may be in the early stages of decay. Spirit
continues to use power conservatively in view of the recent jump in dust
levels and the struggle for survival by Spirit's twin, the Opportunity
rover, on the opposite side of the red planet.

Spirit remains parked just east of the elevated plateau known as "Home
Plate," with the Moessbauer spectrometer placed on the target known as
"Innocent Bystander." On sol 1273 (Aug. 2, 2007), Spirit performed a
5-hour study with the Moessbauer spectrometer.

After the dust settles, Spirit's handlers on Earth plan to have the
rover continue collecting Moessbauer data from Innocent Bystander for a
few sols, acquire microscopic images of the new dust layer on the soil,
and drive onto Home Plate.

Sol-by-sol summary:

Except where noted, daily communications activities included morning,
direct-from-Earth uplinks over the rover's high-gain antenna and evening
relays of data to Earth at UHF frequences via the Odyssey orbiter. In
addition, Spirit completed the following activities:

Sol 1268: Spirit measured atmospheric Tau with both the panoramic camera
and navigation camera. The rover did not relay data to Earth to conserve
power.

Sol 1269: Spirit measured Tau and completed a sky survey using the
panoramic camera. The rover's handlers on Earth did not send
instructions to the rover to conserve power.

Sol 1270: Spirit measured Tau and completed a sky survey using the
panoramic camera. The rover's handlers on Earth did not send
instructions to the rover to conserve power.

Sol 1271: Spirit measured Tau and completed a sky survey using the
panoramic camera. The rover measured Tau using the navigation camera and
acquired images of sand ripples on the surface with the front hazard
avoidance camera.

Sol 1272: Spirit took more images of sand ripples with the front hazard
avoidance camera as well as with the rear hazard avoidance camera. The
rover acquired a mosaic of sand ripple images with the navigation
camera. Spirit measured atmospheric dust, acquired images of the sky,
completed a horizon survey, and acquired images of the "El Dorado" dune
field with the panoramic camera. To conserve power, Spirit did not send
data to Earth.

Sol 1273 (Aug. 2, 2007): Spirit studied Innocent Bystander with the
Moessbauer spectrometer.

Odometry:

As of sol 1265 (July 25, 2007), Spirit's total odometry remained at
7,153 meters (4.44 miles).
Received on Thu 09 Aug 2007 11:28:59 AM PDT