PUBLIC INFORMATION OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION 
PASADENA, CALIF. 91109. TELEPHONE (818) 354-5011
http://www.jpl.nasa.gov

PHOTO CAPTION                           MRPS #81696           
                                        July 21, 1997  (Sol 18)
                                        Area of 360 degree 
                                        color panorama

This portion of the 360-degree gallery panorama shows 
Pathfinder's rear ramp, the rock Barnacle Bill at left, and rover  
tracks leading up to the large rock Yogi. Rover Sojourner is seen 
using its Alpha Proton X-Ray Spectrometer (APXS) instrument to 
study Yogi's composition.  Rover tracks and circular patterns in 
the soil are from Sojourner's soil mechanics experiments, in 
which varying amounts of pressure were applied to the rover's 
wheels in order to determine physical properties of the soil. The 
image was taken by the Imager for Mars Pathfinder (IMP) over sols 
8,9 and 10, using the red, green and blue filters.

Mars Pathfinder is the second in NASA's Discovery program of low-
cost spacecraft with highly focused science goals. The Jet 
Propulsion Laboratory, Pasadena, CA, developed and manages the 
Mars Pathfinder mission for NASA's Office of Space Science, 
Washington, D.C. JPL is an operating division of the California 
Institute of Technology (Caltech).  The Imager for Mars 
Pathfinder (IMP) was developed by the University of Arizona Lunar 
and Planetary Laboratory under contract to JPL.   Peter Smith is 
the Principal Investigator.

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