Questions tagged [juno]

Questions regarding the JUNO spacecraft, a NASA mission to Jupiter.

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1answer
309 views

JPL Horizons original reference orbit data for Juno - how to retrieve now that it's been updated?

Because of the slow helium valve responses, Juno was not instructed to execute the large delta-v maneuver to drop from the ~53 day orbit to the ~14 day orbit originally scheduled for 2016-Oct-19. I'd ...
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What exactly is the interaction that blocked Juno's data downlink near solar conjunction?

According to Space.com's article Juno Phones Home: Jupiter Probe Reconnects with Earth After 8th Flyby, Juno's recent close flyby of Jupiter and data collection happened while Jupiter was too close to ...
9
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1answer
277 views

Is there any publicly available logging, or “Wayback Machine” for DSN Now activity?

This question and especially this comment address activity associated with the Juno mission, both circa arrival, and the relatively quiet transit period to Jupiter. The idea is that there may have ...
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2answers
362 views

Juno's original orbit around Jupiter - is this apsidal precession? If so, need expression

Below is a plot of Juno's originally planned orbit around Jupiter, extracted from JPL Horizons. It's shown in J2000 ecliptic coordinates, centered on the Jupiter barycenter. It turns out the orbit is ...
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2answers
336 views

If Juno's long orbit means a lower rate of radiation damage, why the planned short orbit?

The Juno Spacecraft (also Wikipedia, launch 05-Aug-2011, Jupiter orbit insertion 05-Jul-2016) was scheduled for a burn to reduce it's period from about 54 days to 14 days, while maintaining a ...
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4answers
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Why destroy Juno at the end of the mission?

As follows from the mission timeline: Launch - August 5, 2011 Deep Space Maneuvers - August/September 2012 Earth flyby gravity assist - October 2013 Jupiter arrival - July 2016 Spacecraft will orbit ...
14
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1answer
1k views

How is JunoCam different from a normal CCD camera?

JunoCam has tweeted us! More background from the BBC. It is supposed to have several features that help allow it to work in the high radiation and magnetic fields it will experience during each ...
2
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1answer
233 views

Why would Juno's originally planned orbit lowering partially mitigate radiation damage?

I'm trying to understand where Juno will pick up most of the slow, cumulative radiation damage within it's orbit. Currently it is in the higher, 53 day orbit. The original plan was that tomorrow (...
33
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1answer
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Why does this image of Jupiter look so strange?

The Universe Today's Yes, This is Actually the Shadow of Io Passing Across the Surface of Jupiter shows several images of Jupiter taken by JunoCam. Why does this image look so strange? Instead of an ...
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2answers
331 views

How to understand this NASA animation of Juno's passes near Jupiter?

I don't understand! Rotating frame? I see Orion pass by around 00:30 to 00:36, that's a clue. Why the first two passes are on the same side (in this view) but the rest alternate? edit: This is ...
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Why wasn't an RTG used on the Juno spacecraft?

When I first heard about the Juno spacecraft, I was surprised that it would be using solar panels to generate power throughout the mission. Why wasn't a radioisotope thermoelectric generator (RTG) ...
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2answers
621 views

Will JUNO be able to return any photographs?

Looking at the scientific instruments of JUNO, there doesn't appear to be a camera. Furthermore, no mention is made of any photos being returned in the scientific objectives. Will anything resembling ...
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6answers
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How was Juno's arrival set up to be on the evening of July 4th?

Presumable it is largely a coincidence that Juno arrives at the perfect moment for American pride in NASA's achievements, but not entirely. The video below of the trajectory, released in July 2011 ...
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4answers
666 views

The plane of the orbit of Juno around Jupiter is not the ecliptic plane. How did it get into this plane?

Did Juno start off its course on the ecliptic plane from the earth orbit and then left it at insertion to Jupiter's orbit over its north pole or it was always in that plane?
10
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1answer
350 views

Are any software updates scheduled for Juno?

So Juno approaches seeking her gravity assist. During the course of the maneuver several on-board systems shall be powered up - in all probability they are nominal, having already been checked-out ...
5
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1answer
619 views

Why are these multi-junction solar cells 40% efficient on earth but 30% in space?

This video about Spectrolab's spacecraft power systems mentions Juno several times and it looks like the Juno panels are shown at several points in the video. Multi-junction cells are discussed, they ...
2
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1answer
171 views

Juno RF power output

What is the RF Power Output from Juno into its Parabolic dish, and the RF radiated out from the dish and the eventual power received say at the dish in Canberra which obviously then would need to be ...
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5answers
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How long does it take for a signal to travel between Earth, and Juno at Jupiter?

How long would it take for Juno's communication to reach the Earth? In other words: what is the time delay between perception by Juno and perception by NASA researchers?
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2answers
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How will Juno establish existence of solid core within Jupiter and determine its size?

One of the set goals for NASA's New Frontiers Juno mission is studying Jupiter's interior and determining if this gas giant has a solid core and if, how large it is. This is mentioned several times on ...
15
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1answer
763 views

Resilience to data transmission errors of the Juno spacecraft

What techniques have been employed for the Juno spacecraft to successfully transmit data packets back to Earth once she's in a polar orbit around Jupiter? Jupiter is a strong source of radio ...
10
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1answer
383 views

Does NASA use Newtonian model of gravity for plotting the course of Juno or general relativity?

With the huge mass of Jupiter and its fast, approximately 10 hours daily rotation, there may be substantial twisting of space-time around it. A distortion of such magnitude that may call for ...
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2answers
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When will Juno send us some pictures from it's tight orbit?

Juno probe has sent few pictures as it approached Jupiter from afar, but Jupiter looks as large as Moon on our sky on those photos. After that it went into (intentional) silence while it was trying to ...
5
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0answers
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When did deep-space probes start getting wrapped in germanium-coated film?

The NASA video Juno Engineering: Precision Matters shows the Juno spacecraft on what look like it might be a spin balance table after about 02:50 and there one can ...
5
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1answer
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Why did Cassini have reaction wheels but Galileo, Juno and New Horizons don't?

Three gas giant planet orbiters are mentioned in this answer: Cassini - Uses Reaction Wheels and thrusters Galileo - Primarily managed via spinning the spacecraft and thrusters. Juno - Just ...
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303 views

When Juno finally de-orbits into Jupiter, will metal sink to the core, or remain in the atmosphere?

The answer would have to be best scientific guess or theory, rather than fact, but has any thought been given to what actually happens to the metallic elements of a spacecraft de-orbited into Jupiter? ...
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1answer
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If Juno will experience lower levels of radiation than Galileo did why it will fail so much faster?

In the section about Orbit and Environment the Wikipedia article about the Juno spacecraft says: In comparison, Juno will receive much lower levels of radiation than the Galileo orbiter at its ...
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139 views

How to know when JPL Horizons is updated with new Juno spacecraft trajectory?

I "watched" Juno's flyby of Jupiter using the simulation in the NASA's Eyes app on my laptop, and later saw the good news in this tweet. Now I want to do a "flyby in Python". Using the setup (shown ...
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3answers
181 views

Juno to Jupiter Budget

Would the Juno program be more cost effective if the spacecraft took a direct flight to Jupiter rather than using gravitational pull from planets, which took nearly 5 years instead of say, 2 years? ...