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Juno skims the cloud tops of Jupiter
- WalterGR 4y agoHow much time elapses in that time-lapse? Edit: Two hours of real-time Jupiter: https://www.youtube.com/watch?v=GPMK_6-QrIg https://www.youtube.com/watch?v=GPMK_6-QrIg
- FredPret 4y agoThat's incredible! Is this video actual real-time footage?
- pjscott 4y agoIn case anybody was wondering "Why is the frame rate so lousy?" the answer is that the probe only has about 325 bits per second of downlink on average. https://en.wikipedia.org/wiki/Juno_(spacecraft) https://en.wikipedia.org/wiki/Juno_(spacecraft)
- sgt 4y agoWould it be possible to extrapolate frames in between to give one smooth flyover?
- giantrobot 4y agoYes but it will look like there's extrapolated frames. I'm sure you'll see something like that in a YouTube video or something on the Discovery channel but I don't see the point of NASA doing that.
- Cthulhu_ 4y agoAnd are there additional images in the probe's storage that will be transferred over the coming... years?
- shrx 4y agoNitpick: you interpolate data between two known points (frames), and extrapolate beyond the first or last known datapoint.
- sgt 4y agoThanks for the correction
- scrollaway 4y agoYou just blew my mind. Thanks for pointing this out, what seems obvious in hindsight :)
- sgt 4y agoI guess extrapolation is quite simple: just pitch black
- abrichr 4y agoHere's an attempt: https://youtu.be/RgvxLEYeb3g https://youtu.be/RgvxLEYeb3g
- sgt 4y agoReally cool - if you could also change the shape of the planet it would look even better.
- skohan 4y agoWhat's the limiting factor on bandwidth constraints for probes like this? Is it the power of the probe? Is it the distance from earth? I wonder if you could build a mesh network of satellites/probes out farther into the solar system to get better connectivity for projects like this.
- rich_sasha 4y agoThe limiting factor is power/distance^2 basically, which determines the signal/noise ratio, which determines the bandwidth. A mesh network sounds fun, though you'd have to have a fair few probes, as their orbits wouldn't be in sync. Also that far from the sun, solar panela don't cut it and you need nuclear thermal generators, which have a finite lifespan.
- credit_guy 4y agoAlso the power. Juno does not have nuclear power, only solar panels. The Sun is quite dim at Jupiter’s distance. From wikipedia: Power: 14 kW at Earth,435 W at Jupiter Overall the strangth of the signal coming from a solar powered spacecraft in the outer Solar system should go down with the 4th power of the distance.
- holoduke 4y ago210,000 kilometers per hour. Almost 60km/40mi per second. Amazing speed when you think about it. Wonder if there would be any time dilation noticable if the craft ever gets captured and brought back to earth.
- ericbarrett 4y agoSimilarly I wonder if there was any detectable heating from kinetic interaction with dust and trace atmosphere. 60 km/sec is fast!
- orbital-decay 4y agoNot sure about the composition of atmosphere at those exact altitudes on Jupiter, but aerodynamic heating was a serious concern during Cassini's close Titan flybys, and that's "just" at ~6.3km/s max. IIRC the closest one was the T-70 at 880km; a lot of work has been done to make sure it won't tumble or overheat. (Titan's low gravity makes its dense atmosphere reach very far, so 880km is really low)
- pvg 4y agoRelativistic effects are measurable with accurate enough clocks in earth satellites (or even just taking a clock to a mountain) and correction is necessary in systems with finicky time requirements like GPS. Incidentally, the relative speed you can napkin math estimate - an object in orbit flying that close to the planet is going to have escape-velocity-ish speed. It's around 60km/sec for Jupiter.
- 0daystock 4y ago
- leephillips 4y agoI was surprised to hear that. I visit nasa.gov frequently, and I’ve never seen this nonsense.
- _jal 4y agoIt is pretty easy to set off if you control your browser much (privacy-enforcing proxies, ad blockers, etc.). I haven't seen it with NASA, but I'm currently doing something that trips CF's verify-your-humanity bullshit on third party sites a lot. Haven't yet figured out what upsets it.
- 0daystock 4y agoI think it's privacy.resistFingerprinting. They really want to get your canvas fingerprint to track you.
- Sebguer 4y agoTo prevent bots from causing bandwidth costs to be insane?
- 0daystock 4y agoNASA can land on the moon, but can't make thier own captcha without capitulating to Google's massive takeover of the web?
- FredPret 4y agoWhy spend tax dollars on making features that can be bought from the private sector? Now Google's dominance is another story entirely, so one could argue they should use hcaptcha, but making their own one seems like superfluous bureaucracy
- 4y ago
- xixixao 4y agoCan someone run this through ML to create a smooth animation?
- dylan604 4y agoWhy? Just 3D animate it using other imagery from NASA/ESA probes to map to a sphere and then fly the camera over it in what ever fashion you want your pretty pictures. You're confusing scientific data with pretty pictures for the sake of being pretty pictures.
- swayvil 4y agoWhat's the definition of a planet's atmosphere edge? Does it just keep on thinning out to a light year and beyond or is there a clear transition?
- ceejayoz 4y agoBit of both. https://climate.nasa.gov/news/2919/earths-atmosphere-a-multi-layered-cake/ https://climate.nasa.gov/news/2919/earths-atmosphere-a-multi... 99.99997 percent is below 100km, but the exosphere is considered to go as far as 10k, and maybe further: > A February 2019 study using data from the NASA/European Space Agency Solar and Heliospheric Observatory (SOHO) spacecraft suggests, however, that the farthest reaches of Earth’s atmosphere — a cloud of hydrogen atoms called the geocorona — may actually extend nearly 391,000 miles (629,300 kilometers) into space, far beyond the orbit of the Moon.
- arriu 4y agoIt’s really a shame they didn’t put better imaging equipment on Juno. The argument being that little science would be gained from it. I’d argue secondary effects would have made it worth the weight.
- sephamorr 4y agoYou have to be careful what you ask for - I certainly like pretty pictures myself, but one of the reasons that Juno is so successful as a scientific mission is because it was kept to the barebones and managed scope so aggressively. With Juno ($1B for an outer planets mission) we got Flagship mission-quality science for a New Frontiers price. There's a good interview with Mark Wolverton on Planetary Radio that discusses how this happened.
- arriu 4y agoI don’t know. I hear you and do agree but part of me wonders whether the science learned from Juno is boring and pretty pictures would have been more exciting. Potentially leading to more science missions from newly excited public opinions. I am not qualified to make such judgments so I am hoping the did the right thing.
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- lifeisstillgood 4y agoBasic science is the foundation stone of the past 200 years of human progress - and if anyone out there wants to put "double the science budget just because" on their manifesto they can have my vote. I am so glad we live in an age where this is possible, and that it is celebrated and respected. Fantastic.
- wdr1 4y agoEvery year when I file my federal taxes, there's the little box to give $3 to fund presidential election campaigns. I've never checked it. However, if there was a box to say "Give NASA $20", I'd check it every time.
- ncmncm 4y agoThose check boxes never have any practical effect, but pols like them because they seem like they might.
- wolverine876 4y ago> Basic science is the foundation stone of the past 200 years of human progress I agree, but to nitpick IMHO it's a foundation stone. Others are freedom and human rights (including for basic science: speech, to publish your controversial results uninhibited, religion, when your theory is heretical, etc.), rule of law (to protect your investment in your research from powerful people who want to stop or sieze it), and other basics.
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