Studies began with a stack of microscopic images taken at different focal lengths, then moved to compositional analysis using the alpha-particle X-ray spectrometer.

On sol 1797 (Jan. 22, 2009), Spirit was to drive toward a prospective "on-ramp" to Home Plate, but a portion of the commands was corrupted during transmission and rejected by the rover.

That particular drive is now planned for sol 1798 (Jan. 23,2009). Also on sol 1797 Spirit was slated to take a deep sleep for the first time, as part of overall attempts to minimize power usage when not driving.

Future plans call for Spirit to drive south across Home Plate toward Goddard/Von Braun with all haste in order to reach the next "Winter Haven" before the end of the summer season.

Spirit is healthy and all subsystems are performing as expected as of the downlink of information from Mars for sol 1797 (Jan. 22, 2009). Solar-array energy is around 199 watt-hours (almost enough energy to light a 100-watt bulb for two hours). Tau (a measure of the amount of sunlight blocked by dust in the aosphere) dropped to 0.536, slightly lower than last week.

The dust factor, a measure of the amount of sunlight penetrating dust on the solar panels, is 0.2461, meaning that only about one-fourth of the sunlight reaching Spirit's solar arrays penetrates the layer of dust to generate electricity.

Sol-by-sol summary

In addition to making daily measurements of aospheric darkness caused by dust, Spirit completed the following activities:

Sol 1791 (Jan. 15, 2009): Spirit completed a timed drive. At the end of the drive, Spirit took images with the hazard-avoidance and navigation cameras.

Sol 1792: Spirit took lossless-compression, full-color images, using all 13 filters of the panoramic camera, of a patch of material exposed in the wheel tracks called "Thunderbolt."

Sol 1793: Spirit completed another timed drive, acquired hazard-avoidance camera images, and took a post-drive, 5-x-1 tier of navigation-camera images.

Sol 1794: Spirit acquired full-color, lossless-compression images, using all 13 filters of the panoramic camera, of Thunderbolt.

Sol 1795: Spirit acquired a 3-by-1 tier of panoramic-camera images looking in the drive direction.

Sol 1796: Spirit checked for drift (changes with time) in the miniature thermal emission spectrometer, used the instrument to study the target called Robert Heinlein, unstowed the robotic arm, and acquired a 1-by-1-by-5 stack of stereo (3D) microscopic images of Stapledon. The rover placed the alpha-particle X-ray spectrometer on the target and, after relaying data to Odyssey, measured the elemental composition of Stapledon with the instrument.

Sol 1797: Spirit was slated to check for drift (changes with time) in the miniature thermal emission spectrometer, use the instrument to study the target called Robert Heinlein, stow the robotic arm, and drive, stopping mid-drive to take panoramic-camera images of Stapledon. At the end of the drive, the rover was to take images with the hazard-avoidance and navigation cameras. These events were rescheduled when a corrupted command sequence prevented them from taking place.

Sol 1798: Plans called for Spirit to take panoramic-camera images of a rock feature called "Mustang" along with spot images of the sky for calibration purposes.

Odometry

As of sol 1797 (Jan. 22, 2009), Spirit's total odometry was 7,531.60 meters (4.68 miles).

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