At 3:08:30 AM on September 21, 1997, the MOC field of view swept
across the highland valley network Nirgal Vallis at 28.5°S, 41.6 W.
Although the MGS spacecraft was at an altitude of about 400 km
(250 miles), the MOC was pointed obliquely across the planet at
about 35°, so the distance to Nirgal Vallis was closer to 800 km
(500 miles). At that range and viewing angle, the MOC field of view
was about 16 km (10 miles) wide, and the resolution was about 9
meters (30 feet) per pixel. The acquired image is 36 km (23 miles) long.
Five images are shown above:
(A) is an excerpt from the USGS MDIM, roughly 180 km (112 mile)
square. The small box outlines the MOC image acquisition.
(B) is MOC frame P006_05, shown here at reduced resolution
because the full image is almost 7 MBytes in size. Because the MOC
acquires its images one line at a time, the cant angle towards the
sun-lit portion of the planet, the spacecraft orbital velocity, and the
spacecraft rotational velocity combined to significantly distort the
image. However, even in this reduced resolution version, dunes can
be seen in the canyon and in areas on the upland surface around
(C) shows a portion of P006_05 at the full resolution of the data.
This view shows the dunes more clearly, and also illustrates better
the distortion introduced by the method of data acquisition.
(D) shows P006_05 skewed and rotated to the perspective that
MOC was viewing at the time the image was taken.
(E) shows a full-resolution version of a portion of the rotated
Nigral Vallis is one of a number of canyons called valley networks
or runoff channels. Much of the debate concerning the origin of these
valleys centers on whether they were formed by water flowing
across the surface, or by collapse and upslope erosion associated
with groundwater processes. At the resolution of this image, it is
just barely possible to discern an interwoven pattern of lines on the
highland surrounding the valley, but it is not possible to tell whether
this is a pattern of surficial debris (sand or dust), as might be
expected with the amount of crater burial seen, or a pattern of
drainage channels. With 4X better resolution from its mapping orbit,
MOC should easily be able to tell the difference between these two
Launched on November 7, 1996, Mars Global Surveyor entered
Mars orbit on Thursday, September 11, 1997. The spacecraft has
been using atmospheric drag to reduce the size of its orbit for the
past three weeks, and will achieve a circular orbit only 400 km (248 mi)
above the surface early next year. Mapping operations begin in
March 1998. At that time, MOC narrow angle images will be 5-10 times
higher resolution than these pictures.
Malin Space Science Systems
and the California Institute of Technology built the MOC using spare
hardware from the Mars Observer mission. MSSS operates the
camera from its facilities in San Diego, CA. The Jet Propulsion
Laboratory's Mars Surveyor Operations Project operates the Mars
Global Surveyor spacecraft with its industrial partner, Lockheed Martin
Astronautics, from facilities in Pasadena, CA and Denver, CO.
Photo Credit: NASA/JPL/Malin Space Science Systems
MRPS #84721 100297_2 605.all.str consisting of 605.ctx.str/MOC212A,
605.str/MOC212B, 605.sub.str/MOC212C, 605.obl.str/ MOC212D, and
605.obl.sub.str/MOC212E 559303731.605 P006_05
Full Res Image