• NASA Juno Mission Completes Latest Jupiter Flyby

    From baalke@1:2320/100 to sci.space.news on Tue Dec 20 00:14:42 2016
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    http://www.jpl.nasa.gov/news/news.php?feature=6695

    NASA Juno Mission Completes Latest Jupiter Flyby
    Jet Propulsion Laboratory
    December 9, 2016

    Updated 12-12-16 at 1:55 p.m. PST

    NASA's Juno mission completed a close flyby of Jupiter on Sunday, Dec.
    11, its latest science orbit of the mission.

    Seven instruments and the spacecraft's JunoCam were operating during the
    flyby to collect data that is now being returned to Earth. Juno is currently in a 53-day orbit, and its next close flyby of Jupiter will occur on Feb.
    2, 2017.

    On Sunday, Dec. 11, at 9:04 a.m. PST (12:04 p.m. EST, 17:04 UTC) NASA's
    Juno spacecraft will make its third flyby over Jupiter's mysterious cloud tops.

    At the time of closest approach (called perijove), Juno will be about
    2,580 miles (4,150 kilometers) above the gas giant's roiling cloud tops
    and traveling at a speed of about 129,000 mph (57.8 kilometers per second) relative to the planet. Seven of Juno's eight science instruments will
    be on and collecting data during the flyby.

    "This will be the first time we are planning to operate the full Juno capability to investigate Jupiter's interior structure via its gravity
    field," said Scott Bolton, principal investigator of Juno from the Southwest Research Institute in San Antonio. "We are looking forward to what Jupiter's gravity may reveal about the gas giant's past and its future."

    Mission managers have decided not to collect data with the Jovian Infrared Auroral Mapper (JIRAM) instrument during the December flyby, to allow
    the team to complete an update to the spacecraft software that processes JIRAM's science data. A software patch allowing JIRAM's operation is expected to be available prior to the next perijove pass on Feb. 2, 2017.

    The spacecraft team continues to weigh its options regarding modifications
    of Juno's orbital period -- how long it takes for the spacecraft to complete one orbit around Jupiter. At present, Juno's orbital period is 53.4 days. There had been plans to perform a period reduction maneuver with the spacecraft's
    main engine on Oct. 19 to reduce the orbital period to 14 days. The team
    made the decision to forgo the maneuver in order to further study the performance of a set of valves that are part of the spacecraft's fuel pressurization system.

    "We have a healthy spacecraft that is performing its mission admirably,
    and we are able to obtain great science every time we fly by," said Rick Nybakken, project manager for Juno from NASA's Jet Propulsion Laboratory
    in Pasadena, California. "What we do not want to do is add any unnecessary risk, so we are moving forward carefully."

    The Juno spacecraft launched on Aug. 5, 2011, from Cape Canaveral, Florida, and arrived at Jupiter on July 4, 2016. During its mission of exploration, Juno soars low over the planet's cloud tops -- as close as about 2,600
    miles (4,100 kilometers). During these flybys, Juno will probe beneath
    the obscuring cloud cover of Jupiter and study its auroras to learn more
    about the planet's origins, structure, atmosphere and magnetosphere.

    NASA's Jet Propulsion Laboratory, Pasadena, California, manages the Juno mission for the principal investigator, Scott Bolton, of Southwest Research Institute in San Antonio, Texas. The Juno mission is part of the New Frontiers Program managed by NASA's Marshall Space Flight Center in Huntsville,
    Alabama for the Science Mission Directorate. Lockheed Martin Space Systems, Denver, Colorado, built the spacecraft. JPL is a division of Caltech in Pasadena, California.

    More information on the Juno mission is available at:

    http://www.nasa.gov/juno

    http://missionjuno.org

    The public can follow the mission on Facebook and Twitter at:

    http://www.facebook.com/NASAJuno

    http://www.twitter.com/NASAJuno

    The Web video "Visions of Harmony: Inspired by NASA's Mission Juno" is available at:

    https://youtu.be/roZyJh9sl6E

    UPDATED 12-12-16 at 5:55 p.m. to include expanded Rick Nybakken quote
    and a link to a Web video.

    News Media Contact
    DC Agle
    Jet Propulsion Laboratory, Pasadena, Calif.
    818-393-9011
    agle@jpl.nasa.gov

    Dwayne Brown / Laurie Cantillo
    NASA Headquarters, Washington
    202-358-1726 / 202-358-1077
    dwayne.c.brown@nasa.gov / laura.l.cantillo@nasa.gov

    2016-313

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