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PHOTO CAPTION                      MRPS #81732           
                                   July 21, 1997  (Sol 18)
                                   New 360-degree color 
                                   gallery panorama

This is the first contiguous, uniform 360-degree color panorama 
taken by the Imager for Mars Pathfinder (IMP) over the course of  
sols 8, 9 and 10.  Different regions were imaged at different 
times over the three Martian days to acquire consistent lighting 
and shadow conditions for all areas of the panorama. At left is a 
lander petal and a metallic mast which is a portion of the low-
gain antenna.  On the horizon the double "Twin Peaks" are 
visible, about 1-2 kilometers away.  The rock "Couch" is the  
dark, curved rock at right of Twin Peaks.  Another lander petal 
is at left-center, showing the fully deployed forward ramp at far 
left, and rear ramp at right., which rover Sojourner used to 
descend to the surface of Mars on July 5. Immediately to the left 
of the rear ramp is the rock Barnacle Bill, which scientists 
found to be  andesitic, possibly  indicating that it is a 
volcanic rock (a true andesite) or a physical mixture of 
particles. Just beyond Barnacle Bill, rover tracks lead to 
Sojourner, shown using its Alpha Proton X-Ray Spectrometer (APXS) 
instrument to study the large rock Yogi. Yogi, low in quartz 
content, appears to be more primitive than Barnacle 
Bill, and appeared more like the common basalts found on Earth. 
The tracks and circular pattern in the soil leading up to Yogi 
were part of Sojourner's soil mechanics experiments, in which 
varying amounts of pressure were applied to the wheels in order 
to determine physical properties of the soil.  During its 
traverse to Yogi the rover stirred the soil and exposed material 
from several centimeters in depth.  During one of the turns to 
deploy Sojourner's Alpha Proton X-Ray Spectrometer, the wheels 
dug particularly deeply and exposed white material.  Spectra of 
this white material show it is virtually identical to the rock 
Scooby Doo, and such white material may underlie much of the 
site. Deflated airbags are visible at the perimeter of all three 
lander petals. 

The IMP is a stereo imaging system with color capability provided 
by 24 selectable filters -- twelve filters per "eye." Its red, 
green, and blue filters were used to take this image. The IMP, in 
its fully deployed configuration, stands 1.8 meters above the 
Martian surface, and has a resolution of two millimeters at a 
range of two meters.

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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