ARLA/CLUSTER: NASA divulga video da participação dos radioamadores no projecto "Say "HI" to Juno"

[João Costa > CT1FBF]

   1.

NASA video of ham radio participation in Juno

When NASA's *Juno* spacecraft flew past Earth on October 9, 2013, it
received a boost in speed of more than 7.3 kilometer per second, which set
it on course for a July 4, 2016, rendezvous with Jupiter, the largest
planet in our solar system

During the flyby, Juno's Waves instrument, which is tasked with measuring
radio and plasma waves in Jupiter's magnetosphere, recorded amateur radio
signals. This was part of a public outreach effort involving ham radio
operators from around the world. They were invited to say "HI" to Juno by
coordinating radio transmissions that carried the same Morse-coded message.
Operators from every continent, including Antarctica, participated. The
results can be seen in this video clip at
http://photojournal.jpl.nasa.gov/archive/PIA17744.mov

Watch a four-minute video depicting the efforts of a few of the many
amateur radio operators who participated in the event



One of Juno's sensors, a special kind of camera optimized to track faint
stars, also had a unique view of the Earth-moon system. The result was an
intriguing, low-resolution glimpse of what our world would look like to a
visitor from afar.

"If Captain Kirk of the USS Enterprise said, 'Take us home, Scotty,' this
is what the crew would see," said Scott Bolton, Juno principal investigator
at the Southwest Research Institute, San Antonio. "In the movie, you ride
aboard Juno as it approaches Earth and then soars off into the blackness of
space. No previous view of our world has ever captured the heavenly waltz
of Earth and moon."

Watch the Juno Earth flyby movie with a music accompaniment by Vangelis



The cameras that took the images for the movie are located near the pointed
tip of one of the spacecraft's three solar-array arms. They are part of
Juno's Magnetic Field Investigation (MAG) and are normally used to
determine the orientation of the magnetic sensors. These cameras look away
from the sunlit side of the solar array, so as the spacecraft approached,
the system's four cameras pointed toward Earth. Earth and the moon came
into view when Juno was about 600,000 miles (966,000 kilometers) away --
about three times the Earth-Moon separation.

During the flyby, timing was everything. Juno was traveling about twice as
fast as a typical satellite, and the spacecraft itself was spinning at 2
rpm. To assemble a movie that wouldn't make viewers dizzy, the star tracker
had to capture a frame each time the camera was facing Earth at exactly the
right instant. The frames were sent to Earth, where they were processed
into video format.

"Everything we humans are and everything we do is represented in that
view," said the star tracker's designer, John Jørgensen of the Danish
Technical University, near Copenhagen.

"With the Earth flyby completed, Juno is now on course for arrival at
Jupiter on July 4, 2016," said Rick Nybakken, Juno project manager at
NASA's Jet Propulsion Laboratory in Pasadena, Calif.

The Juno spacecraft was launched from Kennedy Space Center in Florida on
August 5, 2011. Juno's launch vehicle was capable of giving the spacecraft
only enough energy to reach the asteroid belt, at which point the sun's
gravity pulled it back toward the inner solar system. Mission planners
designed the swing by Earth as a gravity assist to increase the
spacecraft's speed relative to the sun, so that it could reach Jupiter.
(The spacecraft's speed relative to Earth before and after the flyby is
unchanged.)

After Juno arrives and enters into orbit around Jupiter in 2016, the
spacecraft will circle the planet 33 times, from pole to pole, and use its
collection of science instruments to probe beneath the gas giant's
obscuring cloud cover. Scientists will learn about Jupiter's origins,
internal structure, atmosphere and magnetosphere.

Source: http://www.jpl.nasa.gov/news/news.php?release=2013-360

Radio Hams Say Hi To Juno
http://amsat-uk.org/2013/10/09/radio-hams-say-hi-to-juno/

Thanks to *Andy Thomas G0SFJ* for spotting this item
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