Jupiter (Planet) -- Photographs from space; Jupiter probes; Voyager Project
By 5:00 p.m. the excitement had died down; many of the scientists had
parties to attend that evening, and some members of the press were
planning parties of their own. The schedule of spacecraft activities
also seemed to have slowed. There were dark-side observations planned to
search for lightning and aurorae. There would be a few more ring
pictures—not too much to see on the monitors that night ... or so many
people thought. But a few people were waiting around, perhaps to catch a
glimpse of lightning or auroral activity, or to wait for another look at
Jupiter’s faint ring.
Between 5:52 and 6:16 p.m., six long-exposure, wide-angle photographs of
the dark side of Jupiter had been scheduled to search for aurorae and
lightning. The spacecraft was 1 450 000 kilometers from Jupiter and
about two degrees below the equatorial plane.
Shortly after 6 p.m., the first of these ring photographs appeared on
the TV monitors with unexpected brilliance. Taken in orange and violet
light, the images showed the outline of Jupiter and, protruding from it,
two narrow lines—one reaching all the way to Jupiter’s limb, the other
broken off, apparently hidden by the shadow of the giant planet. Seen
from the new perspective of the shadow of Jupiter, the tenuous rings
were remarkably clear. A sudden renewal of excitement surged through the
devotees remaining in the press room. About 6:15, Brad Smith came down
to join the press to watch the remainder of this series of pictures come
in. “Hey Brad, are you going to burn out the camera with the ring?”
someone joked. “Well, the rings do forward scatter nicely, don’t they?”
Dr. Smith replied. As the wide-angle pictures were followed by
narrow-angle views, more and more detail became apparent. For the first
time, a definite width for the ring could be seen, and there was even a
hint of additional material inside the main ring. All in all, Voyager
had provided one more splendid series of pictures before it took off for
Saturn.
[Illustration: From a vantage point 2.5 degrees above the ring
plane, Voyager 2 was able for the first time to determine the width
of Jupiter’s ring. This picture shows that the ring is ribbon-like
and only a few thousand kilometers wide, quite unlike the broad
rings of Saturn. [P-21757B/W]]
Wednesday, July 11.
JPL Public Information Officer Frank Bristow opened the 10 a.m. press
conference with an announcement: “We’ll have the report from the Imaging
Team including the tremendous pictures that we received here last night
of the Jupiter ring that excited the entire team.”
Public-domain text, read in full here on John Shaqi.
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