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

From: Richard Montgomery <rickmont_at_meteoritecentral.com>
Date: Fri, 11 Oct 2013 18:13:50 -0700
Message-ID: <A014FB1544534C1280FF61B9F9F502FE_at_bosoheadPC>

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
>> 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 09:13:50 PM PDT

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