Juno at Jupiter

[parallaxicality]

Because we're gonna need one.

The team won't take odds on it, but I'm still hoping to find out Jupiter doesn't have a planetary core. That should upend a few theories.

[bknight]

What team are you referring to?

[parallaxicality]

The Juno science team.

[bknight]

The Juno science team.

You work with them?

[DaveC426913]

The team won't take odds on it, but I'm still hoping to find out Jupiter doesn't have a planetary core.

Just how deep is this thing going???

[parallaxicality]

I spoke with one of them a few years back at the Greenwich Royal Observatory.

[bknight]

Are you referring to a metallic hydrogen core?

[parallaxicality]

Pretty much. Although it may a different form at that pressure.

[bknight]

Pretty much. Although it may a different form at that pressure.

What other form might it have?

[KaiYeves]

I don't know how the timing of events will work for me, as I'm in Greece and work from 7AM-2PM at our dig site, but hopefully I'll be able to follow some of the events as they happen. It's very nice that we've had a Big Summer Space Event every year for the past half-decade, though.

[Spacedude]

if you can get the Science Channel they will have a Juno Mission Special on Tuesday @ 9:00pm EST.

[ToSeek]

I've taken the liberty of changing the name of the thread to "Juno at Jupiter." I'd suggest transitioning to this thread following the confirmation of orbit insertion.

And the pre-insertion press conference has just started. http://www.nasa.gov/nasatv if you want to watch.

[01101001]

Live Blog

Engine shutdown! Mission control confirms Juno's main engine has turned off right on time.

Up next will be the spin-down of Juno from 5 rpm back to its normal spin rate of 2 rpm in the next couple of minutes. Around 12:07 a.m. EDT (0407 GMT), Juno will begin turning back to a sun-pointing orientation to begin recharging its batteries and resume normal communications with Earth.

[01101001]

California: fireworks continuing...

[01101001]

Burn lasted 35 minutes, 2 seconds, about one second off the prediction. (Must be some ATM gold in that 1-second "anomaly"! )

[Jerry]

Burn lasted 35 minutes, 2 seconds, about one second off the prediction. (Must be some ATM gold in that 1-second "anomaly"! )

Anomalies are hard to find these days; and orbital insertions rarely yield gold. We are much more likely to see strangeness in the core data.

[01101001]

Burn lasted 35 minutes, 2 seconds, about one second off the prediction. (Must be some ATM gold in that 1-second "anomaly"! )

And, I heard: Juno entered its orbit within one sweet centimeter of the target.

Call me crazy, but I'm beginning to think NASA has a pretty fine model of how that gravity thang works even away from Earth orbit.

(Protip: when thinking people see the phrase "ATM gold", they should think not of Au, but instead FeS₂.)

[Squink]

And, I heard: Juno entered its orbit within one sweet centimeter of the target.

There's an incredibly accurate GPS constellation deployed around Jupiter to make this measurement possible?

[crosscountry]

There's an incredibly accurate GPS constellation deployed around Jupiter to make this measurement possible?

There are other ways to measure. I heard one second, not one cm. Of course 1 second traveling at their speeds is 10,000 m.


Nevertheless, with Doppler tracking, they can get the velocity very accurately. Velocity and acceleration from Jupiter's gravity tell a whole lot of the story.

[01101001]

Emily Lakdawalla:

YAY

Juno, welcome to Jupiter!!!!!!!!!!!!!!!!!!!!!!!!

[ToSeek]

12:08 AM EDT - Juno turning to face the Sun again. Completing this transition is tonight's last critical milestone.

[selvaarchi]

One of the 1st reports reporting the event.

http://www.spacepolicyonline.com/new...around-jupiter

NASA's Juno spacecraft successfully entered orbit around Jupiter tonight Eastern Daylight Time (EDT) after a 5-year journey. Juno is the first solar-powered spacecraft to visit the outer planets, where the Sun's strength is comparatively low. Coupled with the harsh radiation environment the spacecraft will endure as it dips closer to planet's cloud-tops than any previous spacecraft, it has a limited lifetime, but is expected to produce groundbreaking data about aspects of the planet never observed before.

Several spacecraft have flown past Jupiter (Pioneer 10 and 11, Voyager 1 and 2, Ulysses, Cassini, and New Horizons) and one orbited it for many years (Galileo), but Juno is the first designed to look beneath the cloud-tops and study the interior. It is also is the first to study Jupiter's poles.

[ToSeek]

12:43 AM EDT - After a long wait (media at JPL's only source was the NASA TV program that ended a while ago), confirmation that Juno is sun-pointing again.

[ToSeek]

Juno already made one surprising finding: Callisto not as bright as expected at the sun angle during Juno's approach.

[ToSeek]

Press conference: as of 1:08 AM getting telemetry but haven't looked at it yet. But tones all looked good.

[ToSeek]

Jupiter approach video

[KaiYeves]

Yay!

[bknight]

Now for the orbit to be reduced down to 14 days, what day is that supposed to be accomplished?

[selvaarchi]

Now for the orbit to be reduced down to 14 days, what day is that supposed to be accomplished?

Nice report in the Guardian on that. Not as scientific as 01101001 post #26

https://www.theguardian.com/science/...bit-spacewatch

Having travelled for more than 1.7bn miles through the solar system, Juno was captured by Jupiter’s gravity at 03:18 GMT on 5 July after an engine burn that lasted 35 minutes.

It is now in a highly elliptical orbit around the giant planet, taking 53.5 days to complete a circuit. It will stay in this “capture orbit” until October, when another engine firing will reduce the size to a 14-day orbit.

[01101001]

Spaceflight 101: Juno Mission & Trajectory Design

July 5, 2016 JOI Burn 35 Minutes
July 5, 2016 Capture Orbits 101 Days
Oct 14, 2016 Period Reduction Maneuver Phase 5.25 Days
Oct 19, 2016 PRM Burn 22 Minutes
Oct 21, 2016 Orbit 2+3 23 Days
Oct 30, 2016 Perijove Reduction —
Nov 2, 2016 Clean-Up Orbit
Nov 16, 2016 Science Orbits 461 Days
Nov 16, 2016 1st Science Orbit 14 Days
Feb 20, 2018 Deorbit Phase 5.5 Days