[meteorite-list] Juno Goes Into Safe Mode During Earth Flyby

From: Richard Montgomery <rickmont_at_meteoritecentral.com>
Date: Fri, 11 Oct 2013 18:14:45 -0700
Message-ID: <428D561EC0D94AE19F5CA5C0443758EE_at_bosoheadPC>

and my keyboard still messes up the spelling...
R!


----- Original Message -----
From: "Richard Montgomery" <rickmont at earthlink.net>
To: "Jodie Reynolds" <spacerocks at spaceballoon.org>; "Ron Baalke"
<baalke at zagami.jpl.nasa.gov>
Cc: "Meteorite Mailing List" <meteorite-list at meteoritecentral.com>
Sent: Friday, October 11, 2013 6:13 PM
Subject: Re: [meteorite-list] Juno Goes Into Safe Mode During Earth Flyby


> Hmmm, I don't have the knowledge nor technology to give this List a
> perspective on Juno with this one difinite exception: given that Juno's
> sovereign journey mission is already well defined (no changing that now!),
> I'd still go into Safe Mode if I were flying by a planet with such an
> effed up political discourse!
>
> Warm regards to all,
> Richard M
>
>
> ----- Original Message -----
> From: "Jodie Reynolds" <spacerocks at spaceballoon.org>
> To: "Ron Baalke" <baalke at zagami.jpl.nasa.gov>
> Cc: "Meteorite Mailing List" <meteorite-list at meteoritecentral.com>
> Sent: Wednesday, October 09, 2013 6:24 PM
> Subject: Re: [meteorite-list] Juno Goes Into Safe Mode During Earth Flyby
>
>
>> Hello Ron,
>>
>> Maybe it was all of us RFing the poo out of her radios at 200-1500 watts
>> over on 10meters [as requested]? :)
>>
>> I was monitoring the entire 1Mhz spectrum width from another location
>> as I was hitting her, and I counted at least six, sometimes eight,
>> other stations mashing the key at the same time I was, and that's
>> just what was in view of my remote receiver down in the valley hole!
>>
>> --- Jodie
>>
>> Wednesday, October 9, 2013, 4:47:23 PM, you wrote:
>>
>>
>>
>>> http://spaceflightnow.com/juno/131009safemode/
>>
>>> Juno goes into safe mode during Earth flyby
>>> BY STEPHEN CLARK
>>> SPACEFLIGHT NOW
>>> October 9, 2013
>>
>>> NASA's Juno spacecraft went into safe mode Wednesday as it flew by Earth
>>> to gain speed on its five-year journey to Jupiter, but the mission's
>>> lead
>>> scientist said the flyby achieved its objective of putting the probe on
>>> the correct course toward the solar system's largest planet.
>>
>>> The Jupiter-bound probe flew about 350 miles over the Indian Ocean near
>>> South Africa at 3:21 p.m. EDT (1921 GMT), and all data indicate the
>>> spacecraft
>>> obtained the predicted gravity boost from the flyby, according to Scott
>>> Bolton, Juno's principal investigator from the Southwest Research
>>> Institute
>>> in San Antonio.
>>
>>> But the spacecraft, stretching the size of a basketball court with its
>>> solar panels extended, experienced a fault some time during the flyby,
>>> going into a safe mode to protect the probe's systems and instruments
>>> while engineers on the ground scramble to diagnose the problem.
>>
>>> Bolton said Juno is designed to downlink data at a slower rate than
>>> normal
>>> during a safe mode, but telemetry from the spacecraft shows all its
>>> systems
>>> and instruments are fine.
>>
>>> The solar-powered spacecraft zoomed over the Indian Ocean on the night
>>> side of the Earth, putting the probe's expansive solar arrays in eclipse
>>> for the first time since its launch in August 2011.
>>
>>> Juno also passed out of range of ground antennas around the time of
>>> closest
>>> approach, and a European Space Agency ground station in Perth,
>>> Australia,
>>> acquired the first radio signals from Juno a few minutes later.
>>
>>> "When we came out of the eclipse, we realized that the spacecraft was
>>> in safe mode," Bolton said. "What we do know is that all the subsystems
>>> and instruments are nominal and behaving OK."
>>
>>> Juno was programmed to collect data during the flyby with its science
>>> payload. The research activities - considered a bonus by the Juno
>>> science
>>> team - included gathering observations of the Earth's magnetic field and
>>> auroras and snapping a series of images of Earth with the spacecraft's
>>> primary camera.
>>
>>> "This did not affect the main purpose of the flyby, which was to put
>>> Juno
>>> on the right course to Jupiter," Bolton said.
>>
>>> Bolton said ground controllers see some indications Juno gathered data
>>> and images during the flyby, but it may take more time to confirm
>>> whether
>>> the craft took the images as planned. If the imagery was collected, it
>>> could take extra time recover the information from the probe's on-board
>>> computer while engineers focus their work on putting Juno back into its
>>> normal operating mode.
>>
>>> Juno is set to arrive in orbit around Jupiter on July 4, 2016, beginning
>>> a one-year science mission studying the gas giant's crushing atmosphere,
>>> powerful magnetic field and enigmatic core. Juno's discoveries could
>>> help
>>> scientists unravel how Jupiter, likely the solar system's oldest planet,
>>> formed and evolved in the early solar system.
>>
>>> ______________________________________________
>>
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>>
>>
>>
>> --
>> Best regards,
>> Jodie mailto:spacerocks at spaceballoon.org
>>
>> ______________________________________________
>>
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>
Received on Fri 11 Oct 2013 09:14:45 PM PDT