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Questions tagged [juno]

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

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How, and How Well will Juno measure the effects of frame dragging? (GR effect due to Jupiter's mass & rotation)

This answer links to Spaceflight 101's One Week to Jupiter – NASA’s Juno Spacecraft en-route to Gas Giant after five-year Journey which says Also, Juno will put Einstein’s General Theory of ...
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Does Juno's UVS have any chance to spot Europa plumes?

JIRAM has recently been proven to be useful to monitor the volcanic activity on Io, from a considerable distance. Europa Clipper will have an ultraviolet spectrograph which be pretty much a copy of ...
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Has budgetary support for Juno been extended, or is it running out?

The Yahoo news article NASA’s Juno snapped another photo of Jupiter that looks like a watercolor painting is a reminder that Juno is generating plenty of data and beautiful images. The Juno ...
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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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What is the difference in resolution between the cameras in Voyager and Juno?

Both Voyager I and the Juno spacecraft photographed Jupiter (among other things). What is the difference in camera resolution between the two spacecraft? Did we receive larger photos from Juno?
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How did the upper stage of the Juno 1 rocket change its orientation while it was spinning?

The upper stage of the Juno 1 rocket was spun up to a high speed prior to launch so it would be spin stabilized and not require a guidance system. After the upper stage separated from the 1st stage it ...
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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 ...
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Why does a spacecraft's attitude become stable when it rotates?

What is the logic behind spacecraft spinning to increase stability? How does angular momentum play a role in this?
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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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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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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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Juno possible retirement adjustment

Notice: I deeply apologize if I'm missing a Logical Issue to this Plan. Instead of ending Juno's mission in 2018 by deorbiting it into Jupiter why not follow these steps. Allow the amount of time ...
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Juno launch to aphelion

I would like to calculate the length of the semi-major axis of Juno's initial heliocentric ellipse from launch to aphelion based on the time from launch to aphelion. Do I use the full 394 days from ...
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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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Why does Juno use “mixed oxides of nitrogen” oxidizer for propulsion? Which ones?

In the recent Spaceflight 101 article Rocket Burn postponed for NASA’s Juno, to remain in elongated Jupiter Orbit until December it says: Juno uses a bi-propellant main propulsion system with ...
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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 (...
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Why are photos from Juno such low resolution?

NASA recently published this photo taken by Juno, at a distance of about 700,000kms from Jupiter: The overall quality (very grainy around the darker regions, a bit washed-out in the brighter areas, ...
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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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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 ...
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How slingshot is used to increase the speed of Juno [duplicate]

I have gone through the slingshot for the Juno with the earth. I have also seen the train and ball example as given by NASA. [http://solarsystem.nasa.gov/basics/grav/primer.php] But, I am still ...
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What are the implications if Juno finds that Jupiter has a solid core?

Juno has arrived at Jupiter, and will begin taking measurements to determine if the gas giant has a solid core. But what I cannot seem to find is the implications such a discovery would have. This ...
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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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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 ...
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Jupiter's impact on Juno's solar panels

Juno has large solar panels on it. I was curious about their effectiveness when Juno is closest to Jupiter. Does Jupiter have a significant impact on the solar panels? Can the solar panels ...
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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 ...
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Why do Juno's solar panels narrow toward the core?

I'm no engineer, but if I was making a vessel with extending sails, solar panels, mast, antennae, etc. I would make them widest close to the core. But Juno's solar panels narrow toward the core as ...
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Who built Juno's chipsets?

Lockheed Martin was responsible for the construction of Juno. But I was wondering who built the chips Juno uses for its onboard computers, and whether or not they are radiation hardened. I would ...
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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?
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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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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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When can we (public) expect to see the first optical images of Jupiter from the Juno spacecraft?

As many of us know, Juno spacecraft achieved orbit of Jupiter yesterday (July 4, 2016). Does anyone have an educated guess on approximately when we might see the first optical images from Juno in ...
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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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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? ...
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How does a spacecraft know that it is in orbit?

After a 5 year long journey in space, Juno finally reached and started orbiting Jupiter. How does the probe actually know that it is in orbit, so that it can send confirmation message like 'Welcome to ...
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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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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 ...
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Has Juno now gone faster than - and braked harder than - any other human-made object ever?

Juno just passed its closest approach to Jupiter, going 58 km/s because it was so deep in Jupiter's gravity well. Ironically, it did this while retrofiring its engines, to slow down. That sounds ...
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What theories is Juno expected to confirm?

According to the Wikipedia article on Juno, the data that Juno returns will sift through multiple competing theories for Jupiter's formation. However the more theories that one has, the more likely ...
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Juno Mission. How better resolution will the optical images be to previous missions?

Resolution in km/pixel at: (i) the closest approach and (ii) typical when in close to Jupiter part of the eccentric orbit.
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How is gravitational time dilation experienced by spacecraft near Jupiter such as Juno

I understand (I think) that a vehicle on or near a planet with greater mass - such as the Juno probe entering Jupiter's orbit soon- will experience time slightly slower relative to us on Earth. ...
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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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Will Juno record its deorbit?

I'm really interested about the Juno mission launched in 2011. The spacecraft will reach Jupiter on July 4, 2016, in couple days from when I write this question. It will orbit Jupiter 37 times ...
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Will there be joint observations from earth and the Juno spacecraft when it reaches Jupiter?

This is a comparison of a visible light image and a radio image of the area around Jupiter's great red spot from an article in Science News. The radio data is from the VLA, and the frequency is chosen ...
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Why does the Juno spacecraft flyby Earth on the way to Jupiter?

Hohmann transfer to Jupiter is about 2 years 8 months. Juno spends 5 years getting there, almost twice as long. I note that it takes Juno 2 years 8 months to get to Jupiter after the Earth flyby, does ...
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Why does NASA's Juno spacecraft only have a one year primary mission?

For many years, Juno has been touted as NASA's "low cost" mission to the Jovian system. As a New Frontiers mission, it is cost capped at only $1 billion. From its launch in August 2011 to its ...
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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 ...
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What is the typical power redundancy built into a spacecraft?

NASA's Juno page says The Juno spacecraft launched aboard an Atlas V-551 rocket from Cape Canaveral, Fla., on Aug. 5, 2011, and will reach Jupiter in July 2016. The spacecraft will orbit Jupiter 32 ...
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Will JUNO do any science of Jupiter's Moons?

It seems like the primary focus of JUNO is to get a better idea of how Jupiter works. The Science Objectives listed on Wikipedia don't seem to include anything about Jupiter's moons, other than a ...
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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 ...