Author Topic: NASA - Juno - Updates  (Read 162614 times)

Offline TakeOff

  • Full Member
  • ***
  • Posts: 377
  • Liked: 76
  • Likes Given: 103
Re: NASA - Juno - Updates
« Reply #540 on: 07/12/2017 12:24 PM »
What would it take to get a visual feeling of the altitude differences of the clouds of Jupiter? Jupiter always looks like a perfect marble because of its size and the distance of its spacecrafts. Could an in spiraling Juno image cloud tops a bit like we see cloud layers from an airplane, or is that unattainable for any spacecraft?

Offline Req

  • Full Member
  • ****
  • Posts: 400
  • Liked: 413
  • Likes Given: 2581
Re: NASA - Juno - Updates
« Reply #541 on: 07/12/2017 01:58 PM »
What would it take to get a visual feeling of the altitude differences of the clouds of Jupiter? Jupiter always looks like a perfect marble because of its size and the distance of its spacecrafts. Could an in spiraling Juno image cloud tops a bit like we see cloud layers from an airplane, or is that unattainable for any spacecraft?

Junocam has already taken some pictures where higher and lower cloud decks are apparent and casting shadows, along with some other interesting looking depressions and channel-like features.

Offline FutureSpaceTourist

  • Senior Member
  • *****
  • Posts: 5976
  • UK
    • Plan 28
  • Liked: 5392
  • Likes Given: 1527
Re: NASA - Juno - Updates
« Reply #542 on: 07/12/2017 03:33 PM »
Quote
William Harwood‏ @cbs_spacenews 2m2 minutes ago

Juno: The first unprocessed images of Jupiter's Great Red Spot are now posted: https://www.missionjuno.swri.edu/junocam/processing/

https://twitter.com/cbs_spacenews/status/885159246886834176

Offline eeergo

  • Phystronaut
  • Global Moderator
  • Senior Member
  • *****
  • Posts: 4947
  • Milan, Italy; Spain; Japan
  • Liked: 643
  • Likes Given: 444
Re: NASA - Juno - Updates
« Reply #543 on: 07/12/2017 04:20 PM »

Quote
William Harwood‏ @cbs_spacenews 2m2 minutes ago


Juno: The first unprocessed images of Jupiter's Great Red Spot are now posted: https://www.missionjuno.swri.edu/junocam/processing/


https://twitter.com/cbs_spacenews/status/885159246886834176


Other two (of the Red Spot) uploaded to the JunoCam raw images website:


https://www.missionjuno.swri.edu/junocam/processing?source=junocam


Also, first online processing contributions are starting to pop up:


https://twitter.com/JPMajor/status/885163408114544640
http://www.unmannedspaceflight.com/index.php?showtopic=8313
-DaviD-

Online zubenelgenubi

  • Full Member
  • ****
  • Posts: 1430
  • Arc to Arcturus, then Spike to Spica
  • Commonwealth of Virginia
  • Liked: 354
  • Likes Given: 991
Re: NASA - Juno - Updates
« Reply #544 on: 07/12/2017 05:12 PM »
If it can't propel itself to a flyby of any of the Galilean moons then what it's the danger of it eventually ending up crashing into Europa and contaminating it?
NSF experts, correct if I'm wrong here...

My understanding is long-term (years, decades, centuries?) perturbations of inert Juno's orbit:
near perijove--by Jupiter's oblateness--not a perfect sphere, equatorial radius significantly larger than polar radius; and by the four Galilean satellites;
near apojove--by the Sun.

Juno can correct for perturbations with the attitude control thrusters for the duration of the mission.  Once Juno is turned off, the perturbations continue with no way to correct them.

The danger is not as great as it was for Galileo--its eccentric equatorial orbits allowed close approaches to all four Galilean satellites for gravitational assists.

The orbits of the outer, irregular (natural) satellites are constantly changing due to solar and other-planetary perturbations.
« Last Edit: 07/12/2017 05:23 PM by zubenelgenubi »
Support your local planetarium!

Offline Star One

  • Senior Member
  • *****
  • Posts: 9082
  • UK
  • Liked: 1571
  • Likes Given: 168
Re: NASA - Juno - Updates
« Reply #545 on: 07/12/2017 05:50 PM »

Offline FutureSpaceTourist

  • Senior Member
  • *****
  • Posts: 5976
  • UK
    • Plan 28
  • Liked: 5392
  • Likes Given: 1527
Re: NASA - Juno - Updates
« Reply #546 on: 07/13/2017 12:34 PM »
More info posted at: https://www.missionjuno.swri.edu/news/juno-spots-great-red-spot

Quote
This enhanced-color image of Jupiterís Great Red Spot was created by citizen scientist Kevin Gill using data from the JunoCam imager on NASAís Juno spacecraft.

The image was taken on July 10, 2017 at 07:07 p.m. PDT (10:07 p.m. EDT), as the Juno spacecraft performed its 7th close flyby of Jupiter. At the time the image was taken, the spacecraft was about 6,130 miles (9,866 kilometers) from the tops of the clouds of the planet.
« Last Edit: 07/13/2017 12:41 PM by FutureSpaceTourist »

Offline Star One

  • Senior Member
  • *****
  • Posts: 9082
  • UK
  • Liked: 1571
  • Likes Given: 168
NASA - Juno - Updates
« Reply #547 on: 07/13/2017 04:41 PM »
There's more here on this article.

https://www.centauri-dreams.org/?p=38093
« Last Edit: 07/13/2017 05:46 PM by Star One »

Offline eeergo

  • Phystronaut
  • Global Moderator
  • Senior Member
  • *****
  • Posts: 4947
  • Milan, Italy; Spain; Japan
  • Liked: 643
  • Likes Given: 444
Re: NASA - Juno - Updates
« Reply #548 on: 07/13/2017 05:16 PM »
Plenty of other spectacular ones (not only of the GRS) popping up on UMSF and the Image Processing official Juno site, as for example these ones.
-DaviD-

Offline Star One

  • Senior Member
  • *****
  • Posts: 9082
  • UK
  • Liked: 1571
  • Likes Given: 168
Re: NASA - Juno - Updates
« Reply #549 on: 07/17/2017 07:14 PM »
Jupiter images thrill, inspire public participation

Quote
Processing images from the camera aboard NASAís Juno spacecraft orbiting Jupiter has turned into a cottage industry of sorts, as rank amateurs, accomplished artists and experienced researchers turn relatively drab ďrawĒ images into shots ranging from whimsical to spectacular and everything in between.

The question is, how accurately do they reflect reality, and is there any way for the casual observer to judge the result?

Quote
ďOnce itís in their hands, we have no control, nor do we want to exert any, over what they do with the data,Ē said Candy Hansen, a senior scientist at the Planetary Science Institute and the JunoCam instrument lead. ďSo we have gotten everything from careful scientific-type processing to incredibly whimsical works of art. So itís a little bit, for you, a buyer-beware situation.Ē

Even so, she said, ďweíre all in, in the sense that I donít have a team of scientists and image processors waiting in the wings in case the public doesnít show up. We donít have a budget, we donít have staff or anything like that. So we are entirely, 100 percent, relying on the public. And some of them have done fabulous work.Ē

Quote
But how realistic are the publicís interpretations of JunoCam images? With other NASA spacecraft, the viewer can have confidence the photos were processed and reviewed by scientifically competent team members and that the images reflect some sort of scientific reality.

With public processing, as Hansen said, itís more a case of buyer beware, and the relatively bland raw images lend themselves to Photoshop-type manipulation. To Hansen, the line between a scientifically accurate image and one that takes liberties with the data is ďthe minute you depart from true color.Ē

ďThe minute you start making the blue a little bluer and the red a little redder, now youíve enhanced the color. And when you really go to the sort of wild ends of the color palette, then I would call it exaggerated. If youíre just plain making up things, then itís false color.

So should viewers wanting to learn more about Jupiter prefer realistic lighting and color to enhanced or exaggerated images?

ďLet me argue against that,Ē she said. ďOur human eye-brain combination is better at seeing details that are there when you exaggerate it a bit, when you enhance it a bit. The details, you can see (them) if you know what youíre looking for in the true color images. But itís so subtle, itís really, like, washed out. I would say we learn a lot by looking at enhanced color images because it pops more to the eye-brain combo.Ē

https://spaceflightnow.com/2017/07/15/jupiter-images-thrill-inspire-public-participation/

Offline Star One

  • Senior Member
  • *****
  • Posts: 9082
  • UK
  • Liked: 1571
  • Likes Given: 168
Re: NASA - Juno - Updates
« Reply #550 on: 09/09/2017 07:43 PM »
Jupiterís aurora presents a powerful mystery

Quote
Jupiter has the most powerful aurora in the solar system, so the team was not surprised that electric potentials play a role in their generation. Whatís puzzling the researchers, Mauk said, is that despite the magnitudes of these potentials at Jupiter, they are observed only sometimes and are not the source of the most intense auroras, as they are at Earth.

ďAt Jupiter, the brightest auroras are caused by some kind of turbulent acceleration process that we do not understand very well,Ē said Mauk, who leads the investigation team for the APL-built Jupiter Energetic Particle Detector Instrument (JEDI). ďThere are hints in our latest data indicating that as the power density of the auroral generation becomes stronger and stronger, the process becomes unstable and a new acceleration process takes over. But weíll have to keep looking at the data.Ē

https://astronomynow.com/2017/09/09/jupiters-aurora-presents-a-powerful-mystery/

Online zubenelgenubi

  • Full Member
  • ****
  • Posts: 1430
  • Arc to Arcturus, then Spike to Spica
  • Commonwealth of Virginia
  • Liked: 354
  • Likes Given: 991
Re: NASA - Juno - Updates
« Reply #551 on: 09/10/2017 09:35 PM »
Juno Scientists Prepare for Seventh Science Pass of Jupiter

Seventh science flyby/eighth perijove on September 1.

There is imagery available on the SWRI Juno web site: https://www.missionjuno.swri.edu/
« Last Edit: 09/10/2017 09:38 PM by zubenelgenubi »
Support your local planetarium!

Offline FutureSpaceTourist

  • Senior Member
  • *****
  • Posts: 5976
  • UK
    • Plan 28
  • Liked: 5392
  • Likes Given: 1527
Re: NASA - Juno - Updates
« Reply #552 on: 09/13/2017 03:04 PM »
Quote
09.08.17
Junoís Eighth Close Approach to Jupiter

This series of enhanced-color images shows Jupiter up close and personal, as NASAís Juno spacecraft performed its eighth flyby of the gas giant planet. The images were obtained by JunoCam.

From left to right, the sequence of images taken on Sept. 1, 2017 from 3:03 p.m. to 3:11 p.m. PDT (6:03 p.m. to 6:11 p.m. EDT). At the times the images were taken, the spacecraft ranged from 7,545 to 14,234 miles (12,143 to 22,908 kilometers) from the tops of the clouds of the planet at a latitude range of -28.5406 to -44.4912 degrees.

Points of Interest include "Dalmatian Zone/Eye of Odin," "Dark Eye/STB Ghost East End,"           "Coolest Place on Jupiter," and "Renslow/Hurricane Rachel." The final image in the series on the right shows Jupiterís south pole coming into view.

JunoCam's raw images are available for the public to peruse and process into image products at: www.missionjuno.swri.edu/junocam

https://www.missionjuno.swri.edu/news/junos-eighth-close-approach-to-jupiter?linkId=42177919

Offline catdlr

  • Member
  • Senior Member
  • *****
  • Posts: 5199
  • Viewed launches since the Redstones
  • Marina del Rey, California, USA
  • Liked: 1870
  • Likes Given: 1284
Re: NASA - Juno - Updates
« Reply #553 on: 11/02/2017 11:01 PM »
Juno Aces Eighth Science Pass of Jupiter, Names New Project Manager

Quote
Data returned Tuesday, Oct. 31, indicate that NASA's Juno spacecraft successfully completed its eighth science flyby over Jupiter's mysterious cloud tops on Tuesday, Oct. 24. The confirmation was delayed by several days due to solar conjunction at Jupiter, which affected communications during the days prior to and after the flyby.

https://www.jpl.nasa.gov/news/news.php?feature=6992
Tony De La Rosa

Offline Star One

  • Senior Member
  • *****
  • Posts: 9082
  • UK
  • Liked: 1571
  • Likes Given: 168
Re: NASA - Juno - Updates
« Reply #554 on: 12/02/2017 10:15 PM »
Juno Isnít Exactly Where itís Supposed To Be. The Flyby Anomaly is Back, But Why Does it Happen?

Quote
ďOur conclusion is that an anomalous acceleration is also acting upon the Juno spacecraft in the vicinity of the perijove (in this case, the asymptotic velocity is not a useful concept because the trajectory is closed). This acceleration is almost one hundred times larger than the typical anomalous accelerations responsible for the anomaly in the case of the Earth flybys. This was already expected in connection with Anderson et al.ís initial intuition that the effect increases with the angular rotational velocity of the planet (a period of 9.8 hours for Jupiter vs the 24 hours of the Earth), the radius of the planet and probably its mass.Ē

https://www.universetoday.com/137984/juno-isnt-exactly-supposed-flyby-anomaly-back-happen/amp/

Offline AegeanBlue

  • Full Member
  • ****
  • Posts: 475
  • Raleigh
  • Liked: 109
  • Likes Given: 39
Re: NASA - Juno - Updates
« Reply #555 on: 12/03/2017 03:36 AM »
Juno Isnít Exactly Where itís Supposed To Be. The Flyby Anomaly is Back, But Why Does it Happen?

Quote
ďOur conclusion is that an anomalous acceleration is also acting upon the Juno spacecraft in the vicinity of the perijove (in this case, the asymptotic velocity is not a useful concept because the trajectory is closed). This acceleration is almost one hundred times larger than the typical anomalous accelerations responsible for the anomaly in the case of the Earth flybys. This was already expected in connection with Anderson et al.ís initial intuition that the effect increases with the angular rotational velocity of the planet (a period of 9.8 hours for Jupiter vs the 24 hours of the Earth), the radius of the planet and probably its mass.Ē

https://www.universetoday.com/137984/juno-isnt-exactly-supposed-flyby-anomaly-back-happen/amp/

While it could turn out to be something as mundane as the Pioneer anomaly, the flyby acceleration anomaly seems to me like a great candidate for New Physics. We still have quite a few close approaches to Jupiter, let's if in the end we have more evidence for New Physics or just better understanding of Jupiter's distribution of mass

Offline Ben the Space Brit

  • Senior Member
  • *****
  • Posts: 7112
  • A spaceflight fan
  • London, UK
  • Liked: 637
  • Likes Given: 745
Re: NASA - Juno - Updates
« Reply #556 on: 12/03/2017 07:56 AM »
Could the spacecraft be gaining energy due to being a ferrous body moving through Jupiter's notoriously violent radiation belts and geomagnetic field?
"Oops! I left the silly thing in reverse!" - Duck Dodgers

~*~*~*~

The Space Shuttle Program - 1981-2011

The time for words has passed; The time has come to put up or shut up!
DON'T PROPAGANDISE, FLY!!!

Online LouScheffer

  • Full Member
  • ****
  • Posts: 1780
  • Liked: 2278
  • Likes Given: 249
Re: NASA - Juno - Updates
« Reply #557 on: 12/04/2017 02:24 PM »
Juno Isnít Exactly Where itís Supposed To Be. The Flyby Anomaly is Back, But Why Does it Happen?
Quote
ďOur conclusion is that an anomalous acceleration is also acting upon the Juno spacecraft in the vicinity of the perijove [...]
https://www.universetoday.com/137984/juno-isnt-exactly-supposed-flyby-anomaly-back-happen/amp/
While it could turn out to be something as mundane as the Pioneer anomaly, the flyby acceleration anomaly seems to me like a great candidate for New Physics. We still have quite a few close approaches to Jupiter, let's if in the end we have more evidence for New Physics or just better understanding of Jupiter's distribution of mass
In my opinion, the flyby anomaly is looking a lot like a modelling error.  In the paper Reconstruction of Earth flyby by the Juno spacecraft the authors experiment with various gravity models, and note that using a lower precision model (10th order/degree) gives errors similar to the flyby anomaly.  Such lower precision models are typically used for launch, where they are more than good enough since the performance of the launch vehicle has much larger errors already (typically m/s as opposed to the mm/sec of flyby anomalies).  They conclude a *very* accurate gravity model (up to 100 degree/order) is needed for Earth flyby modelling. 

It's circumstantial evidence, but improved gravity models, and their use in trajectory calculations, could account for seeing the flyby anomaly in older missions, but not in the recent ones.  Similarly, I suspect what we are seeing in the Jupiter orbits is an inadequate model of Jupiter's gravity, not a violation of physics as we know it.

Offline the_other_Doug

  • Senior Member
  • *****
  • Posts: 2726
  • Minneapolis, MN
  • Liked: 1777
  • Likes Given: 3387
Re: NASA - Juno - Updates
« Reply #558 on: 12/05/2017 06:09 PM »
Juno Isnít Exactly Where itís Supposed To Be. The Flyby Anomaly is Back, But Why Does it Happen?
Quote
ďOur conclusion is that an anomalous acceleration is also acting upon the Juno spacecraft in the vicinity of the perijove [...]
https://www.universetoday.com/137984/juno-isnt-exactly-supposed-flyby-anomaly-back-happen/amp/
While it could turn out to be something as mundane as the Pioneer anomaly, the flyby acceleration anomaly seems to me like a great candidate for New Physics. We still have quite a few close approaches to Jupiter, let's if in the end we have more evidence for New Physics or just better understanding of Jupiter's distribution of mass
In my opinion, the flyby anomaly is looking a lot like a modelling error.  In the paper Reconstruction of Earth flyby by the Juno spacecraft the authors experiment with various gravity models, and note that using a lower precision model (10th order/degree) gives errors similar to the flyby anomaly.  Such lower precision models are typically used for launch, where they are more than good enough since the performance of the launch vehicle has much larger errors already (typically m/s as opposed to the mm/sec of flyby anomalies).  They conclude a *very* accurate gravity model (up to 100 degree/order) is needed for Earth flyby modelling. 

It's circumstantial evidence, but improved gravity models, and their use in trajectory calculations, could account for seeing the flyby anomaly in older missions, but not in the recent ones.  Similarly, I suspect what we are seeing in the Jupiter orbits is an inadequate model of Jupiter's gravity, not a violation of physics as we know it.

Agreed.  And it seems to me that this is sort of a schizophrenic situation.

One the one hand, Juno's primary mission is to fly through Jupiter's gravity field on extremely elliptical orbits, thus allowing the perturbations of that orbit to help us define and map Jupiter's gravity field.  From a detailed analysis of these perturbations and the resulting insight into the gravity field, we're supposed to be able to much more closely model our view of Jupiter's interior.

On the other hand, the trajectory is being perturbed from its projected path, so there must be some mysterious, extra-physical force pushing at it.

Umm... if our models were perfect and there were no unpredicted perturbations, wouldn't that mean that we had learned nothing from this mission?

Seeing perturbations that are not what you expected just means the nature of what you are observing doesn't match your previous theories.  It doesn't necessarily mean that we are suddenly observing New Physics... :o
-Doug  (With my shield, not yet upon it)

Offline Star One

  • Senior Member
  • *****
  • Posts: 9082
  • UK
  • Liked: 1571
  • Likes Given: 168
Re: NASA - Juno - Updates
« Reply #559 on: 12/05/2017 07:23 PM »
Juno Isnít Exactly Where itís Supposed To Be. The Flyby Anomaly is Back, But Why Does it Happen?
Quote
ďOur conclusion is that an anomalous acceleration is also acting upon the Juno spacecraft in the vicinity of the perijove [...]
https://www.universetoday.com/137984/juno-isnt-exactly-supposed-flyby-anomaly-back-happen/amp/
While it could turn out to be something as mundane as the Pioneer anomaly, the flyby acceleration anomaly seems to me like a great candidate for New Physics. We still have quite a few close approaches to Jupiter, let's if in the end we have more evidence for New Physics or just better understanding of Jupiter's distribution of mass
In my opinion, the flyby anomaly is looking a lot like a modelling error.  In the paper Reconstruction of Earth flyby by the Juno spacecraft the authors experiment with various gravity models, and note that using a lower precision model (10th order/degree) gives errors similar to the flyby anomaly.  Such lower precision models are typically used for launch, where they are more than good enough since the performance of the launch vehicle has much larger errors already (typically m/s as opposed to the mm/sec of flyby anomalies).  They conclude a *very* accurate gravity model (up to 100 degree/order) is needed for Earth flyby modelling. 

It's circumstantial evidence, but improved gravity models, and their use in trajectory calculations, could account for seeing the flyby anomaly in older missions, but not in the recent ones.  Similarly, I suspect what we are seeing in the Jupiter orbits is an inadequate model of Jupiter's gravity, not a violation of physics as we know it.

Agreed.  And it seems to me that this is sort of a schizophrenic situation.

One the one hand, Juno's primary mission is to fly through Jupiter's gravity field on extremely elliptical orbits, thus allowing the perturbations of that orbit to help us define and map Jupiter's gravity field.  From a detailed analysis of these perturbations and the resulting insight into the gravity field, we're supposed to be able to much more closely model our view of Jupiter's interior.

On the other hand, the trajectory is being perturbed from its projected path, so there must be some mysterious, extra-physical force pushing at it.

Umm... if our models were perfect and there were no unpredicted perturbations, wouldn't that mean that we had learned nothing from this mission?

Seeing perturbations that are not what you expected just means the nature of what you are observing doesn't match your previous theories.  It doesn't necessarily mean that we are suddenly observing New Physics... :o

That sounds a bit close minded on the topic if you donít mind me saying.

Tags: Jupiter Juno JunoCam