The math for ALL of this must be staggering. Congratulations to the many minds who made this happen. Those of us who will never understand the magnitude of the effort THANK YOU!

@rusikantanayak3039

2 жыл бұрын

i feel the same.....

@bjornjoseph

10 ай бұрын

It's maths.... there are multiple types of mathematics

@pressaltf4forfreevbucks179

10 ай бұрын

*Computer simulation walks in

@GreenDriveIndia

8 ай бұрын

@@pressaltf4forfreevbucks179 which must be based on mathematics

@Spaciousness1

7 ай бұрын

@@bjornjosephhere in the USA, home of NASA, it is math singular. In the UK, it’s maths plural. But here in the USA we have sports plural and in the UK, sport singular. Go figure. 😂

I love this animated graphic. It explained a lot to me about how it will work. So complicated, but amazing that engineers and astronomers figured out how to do these things.

@HardRockMaster7577

Жыл бұрын

Watch at 50% speed... 😀

As someone whose orbital knowledge came mainly from kerbal space program, this orbit looked really weird for me

@ThiagoNunesRS

3 жыл бұрын

KSP only calculates gravitational force of 1 artificial object around a 1 natural body. The lagrange points are a point of gravitational equilibrium between two celestial bodies. In the case, between Earth and Sun.

@ThiagoNunesRS

3 жыл бұрын

Here's a video from Scott Manley explaining the mod Principia: kzread.info/dash/bejne/l4lhza6FlaidnpM.html

@pauldonlin3439

3 жыл бұрын

Calculating this orbit relies on solutions to the 3-body problem while KSP uses patched conics to simulate orbits (essentially 2 body). JWST is supposed to orbit at the Sun-Earth L2 Lagrange point which is quasi-stable in a 3-body system (as depicted in this animation). If you think of the gravity wells of planets and stars as valleys that you can go down/up and orbit, the Lagrange points are sort of like hilltops. Wikipedia has some good visuals: en.wikipedia.org/wiki/Lagrange_point

@HansDunkelberg1

2 жыл бұрын

@@ThiagoNunesRS Formulating spatially, Sun-Earth Lagrange point 2, of course, isn't _between_ Earth and Sun (that would be L1). Instead, you are dealing with an _orbit around Sun and Earth,_ taken as a double star. The additional mass provided by Earth enables the stronger velocity needed for keeping pace, on a trajectory farther outside. Odd is that Webb's path _around_ L2 changes its orientation in space, within the course of a year. Quite obviously, the craft has to stay in a plane which touches a sphere around the Sun, in L2. Otherwise, it wouldn't be clear to me why the telescope should feel attracted by L2, when it is closer to the Sun than this point. You cannot really fall around nothing. Webb, apparently, is expected to feel attracted by the _ecliptic,_ with its particularly strong accumulation of the masses of Sun and of Earth, somehow.

@rafaelgoncalvesdesa

2 жыл бұрын

@@ThiagoNunesRS Thank you very much

Herkes gibi tiktokta vb. Yerlerde değilde burdaysan değerli birisin

Only *202 more days* to wait until JWST is launched!

@fallinbeef

3 жыл бұрын

Dont forget to factor in the next delayed launch. Be more suprized if there wasnt another one.

@Thevikingcam

3 жыл бұрын

Been waiting for years and years. We all will be blown away by the new images that it brings..

@divyaprakashdixit

3 жыл бұрын

@@Thevikingcam exactly man

@accountthatillusetocomment3041

3 жыл бұрын

I really hope the overhype compensates for it.

@sleepyheadfpv1507

3 жыл бұрын

Can’t wait. Hope the rest of schedule goes by as planned and we aren’t delayed too much more. But I would much much rather then take the extra time then to rush. Because we can’t send a shuttle this time. Not even a robot

I wanna know what differential equation led to this orbital solution.

@thespacecatjenkins8539

4 жыл бұрын

nerd

@PlanetEvans

3 жыл бұрын

Finding L2, or that exact spot in space beyond the Earth, is a Lagrange point calculation. And then that circular or halo orbit around L2 is a simple Lissajous curve. The trajectory, or timing of the takeoff at the equator (i.e.: gauging when the Earth has spun French Guiana launch pad into the best possible location) and figuring out the max velocity of the rocket so it reaches that destination without going beyond, is where all the true mathematical wizardry occurs, IMHO.

@xfreeman86

3 жыл бұрын

@@PlanetEvans What is the mass at the center of the halo orbit as you called it? Or how else does the telescope plan to accelerate around that orbit if there is no gravity pulling it?

@PlanetEvans

3 жыл бұрын

@@xfreeman86 The short answer is the Coriolis effect. You're right that there is no mass located at that L2 coordinate, but the magic of Lagrange points is that, due to the Sun and Earth's "projected gravity" or "virtual mass," let's say, at a few specific orbital locations (L1, L2, L3, L4 and L5), objects will remain in place or in a stable orbit around the Sun-Earth system. Think about it. L2 is farther from the Sun than the Earth, so it *SHOULD* take something at L2 longer to orbit the Sun than it does the Earth - just like it takes the Earth longer to orbit the Sun than Venus or Mercury - but that's not the case. It stays in perfect tandem with the Earth. The balance of the Sun and Earth's combined gravitational attraction makes that happen. Here's where it gets weird, and take whatever I say with a grain of salt and do your own research to verify. As I understand it, L4 and L5 are like being at the "top of a hill," but L1, L2 and L3 are like being at the "bottom of a bowl." So if an object at L4 and L5 gets nudged, it will tend to migrate away from the "magic" Lagrange point. However, at L1, L2 and L3, it would want to return to that spot in space. That's why you can do what James Webb will do and maintain an orbit around L2 with the right velocity. And the reason why you want that halo orbit is because it keeps you out of the Moon or the Earth's shadows and allows for 24/7 astronomy by reducing obstructed views. Also, apparently it enables constant communication with the telescope through the Deep Space Network, but I haven't fully grasped how.

@thisisobvious

3 жыл бұрын

PlanetEvans my understanding, from the NASA description on the page that linked to here, is that L4 and L5 are the positions at which objects gather and remain indefinitely (it mentioned some asteroids being known to orbit in these positions), whereas L1, L2, and L3 are “metastable”, and will slowly drift off into their own orbits around the sun (non-Lagrange) if not periodically corrected. So what you said, but vice versa I think. I had the same question as John (what, if not perpetual/constant correction by onboard thrusters, keeps the telescope “orbiting” L2, in addition to its orbit around the sun). Perhaps the Coriolis effect explains that, it’s at least something I can look into for now so thanks for that. Just thought I’d mention the stuff about Lagrange points while I was here :) (it’s possible you completely explained the L2 orbit but I don’t understand it yet) Edit: the orbital period around L2 will be 6 months and thrusters will be fired every 21 days for periodic correction. That’s probably not all of the puzzle but it helps.

I been waiting this for years...awesome...finally...

Idk why but I'm so exited 😭 they been talking about this thing forever. But Hubble is forever in my heart.

Been following the jwst for over 5 years. Looking forward to its launch! And very appreciative of all the hard work the team is putting into it too, thank you.

@ZeroSpawn

3 жыл бұрын

I been waiting 20 years.

@vincent2053

2 жыл бұрын

@@ZeroSpawn i’ve been waiting 20 years and 1 month.

@michalbilinski4168

2 жыл бұрын

@@vincent2053 here we are

@adityagireesh3928

2 жыл бұрын

finally launched

@DocTheElder

2 жыл бұрын

Kindly advise your current thinking on best KZread channel(s) to follow the progress through deployment/testing and then operations in the coming years.

Can't wait to see its images! Won't be long now!

The soundtrack of this animation should be Powerhouse by Raymond Scott

I've been waiting on the launch for years now, I am most excited for this above all science and technology projects currently under development. Godspeed to further progress!

@dcgoldman

2 жыл бұрын

You said it well. I have been waiting for this launch for many years myself.

Who knew 20 seconds would be this good

nice, can't wait for it to be launched

Universe Sandbox NEEDS to make this when they launch this thing! Make a real time, almost fully accurate simulation of this thing moving in space.

@vkobevk

2 жыл бұрын

unfortunaly they didnt 😊

@Tokaisho1

2 жыл бұрын

Or in Space Engine, would be cool

Congratulations to NASA and Webb technicians for a superlative job!

Were all tired of these awesome videos, we want the real thing!!!

I am so excited as I am sure that many others are at the smooth execution of the deployment so far, looking forward to all the incredible discoveries.

Ich warte gespannt auf die ersten Bilder 😎👍🏾

First, Thank you for the animation and learned responses to previous questions. I do have a few of my own. 1) Is the orbital plane of Webb intended to be precisely perpendicular and tangent to L2's track around the sun? 2) One link you've provided shows the stability of L2 as a saddle in two dimensions, in the plane of Earth's orbit. What is the stability at L2 in the North-South dimension? It must be stable in order to support a perpendicular orbit, yes? 3) What about precession as the Earth continues it's orbit? 4) How significant is perturbation by the Moon's gravity as it orbits the Earth? 5) Is there serious concern of collision with other objects loitering around L2? Any way to detect and dodge them? 6) Was the notion of servicing Webb considered? Either by bringing it back to low Earth orbit for manual parts replacement, refueling and a new booster, or by sending robot vehicles to L2 to dock and refuel? Sorry for all the questions. The more I read the more I have. Thanks again!

@j_m_b_1914

2 жыл бұрын

These are great questions and I really hope the JWST team can address them at some point!

@dnaccount7279

2 жыл бұрын

You have most of these questions answered in right articles if you manage to find them,keep up with reading 🤜🤛

@c094728

2 жыл бұрын

It orbits around the l2 point (using earth's gravity) to avoid the earth's shadow as it is solar powered. L2 is unstable like balancing on the head of a pin so does not collect other objects. Occasional correction burns are needed to maintain position.

@spacerob13

2 жыл бұрын

Hey Don, you had some good questions about the Webb orbit! 1) The plane of the "halo orbit" around the L2 point is tilted slightly. I understand that the tilt is designed to force that plane to rotate ("precess") once a year, synchronizing it with the orbit around the sun. 2) Yup, the system is unstable toward/away from the sun, but stable in the other two directions. Yay, orbital mechanics! 3) See 1. That orbital plane has to precess, or you become unstable 4) The Moon has got to have a pretty big second-order effect on the halo orbit. I'm guessing that they're always correcting for perturbations caused by the Moon. 5) Since L2 is unstable along the sun vector (see 2), there are no objects there naturally. (NASA and ESA have had other spacecraft there, but once you end active control, they ... depart.) The L4 and L5 points are stable, and "Trojan" asteroids loosely collect there (only two known for Earth, but a whole bunch for Jupiter. See NASA's Lucy mission.) 6) We thought about it. The system was already too expensive. If something comes up, you know they'll talk about a robotic mission. But flying the observatory back toward the sun would cause thermal damage, so not a good option. Hope this helps!

@common_c3nts

2 жыл бұрын

1) They orbit the L2 point so they can still have sun on the back side of James Webb so the solar panels keep producing energy. That is also why they keep it perpendicular to the sun. For the solar panels and to ensure the light stays behind the sun shield to keep it cool. 6) They planned that James Webb will never be serviced. It is on its own for 10 years until power failure. Now, technically they could make a mission to service it but with our existing systems it would be a one way trip and purely robots would be used for repairs or upgrades. James Webb, itself, has no propulsion system that could bring it back to earth.

Can’t wait to see some live streaming from James Webb !

This animation is really good for me, a layperson, to envision it. Thank you!

Congratulations, I have been following the mission on a daily basis. I am delighted at it’s success. Thanks for keeping us informed

Very interesting, very cool

amazing telescope!

Can’t wait to see the first images…

Facinated about that Orbit: How does it stay there and orbiting the earth and circling there - with his own fuel or is there a gravitational assist from earth? still fascinated..

@MrSummitville

2 жыл бұрын

It orbits the Sun, not the Earth. 10 - 20 years.

@mkvv5687

2 жыл бұрын

Yes to both. It's in a mostly stable orbit around the imaginary L2 point. From a NASA site "The gravitational forces of the Sun and the Earth can nearly hold a spacecraft at this point, so that it takes relatively little rocket thrust to keep the spacecraft in orbit around L2."

@sausage4mash

2 жыл бұрын

it's the LaGrange point it's a balancing point in gravitational fields ,so you just need tiny little corrections

Amazing!

Awesome.

2 minutes uploaded and 43k views.. we need to launch this thing!!

Congratulations JWST for reaching out to your home!🏠(L2)

It looks so exciting, it's even fun now to watch. Now for the big feed back pics in months, don't let me forget!

now we have to wait 3 more months in order for it to calibrate and align the optics. Cant Wait to see the first image!!!!!

As of today, it is there! Best wishes for the painstaking mirror alignment process.🙂

Wow, what a great animation! I never really understood how the LaGrange points worked. I just knew they had a lot of nice girls.

Not clear on one question. Does the jest simply fall into the L2 orbit and stick there. Or does maintaining the orbit require constant effort?

Just getting the JWST out there, into L2 orbit, in one functional piece was a significant milestone for mankind.

I love the music so much it's so intense! and it add's so much impact on the "20" seconds animation

@srujannagdeve8010

3 жыл бұрын

They used Electrochemical waves instead,of Sound waves !!!😂😂

@worldcitizen7289

3 жыл бұрын

I broke my volume button

why does it also orbit "vertically" around L2 (I use the term vertical in the sense shown by the animation, where the earth is orbit is entirely horizontal around the sun). The animation shows the telescope has both horizontal and vertical components. If it is to stay in the shadow of the earth why isnt it purely in the horizontal plane. Also wont that vertical orbit will require continuous energy ?

@NASAWebbTelescope

3 жыл бұрын

As it turns the rather large halo orbit we picked is a pretty favorable orbit from an “insertion” point of view. With some very small (low fuel cost) maneuvers we kind of “fall” into this orbit naturally. For a time we were investigating smaller orbit (closer to the L2 point itself) which are better from a stray light perspective, and the propellant cost became great enough that we had consider things like gravity assist from lunar swing by’s. Additionally, it would take more energy to sit at the L2 point than to orbit it. (Though fuel to station keep is a factor in the lifetime of the telescope.) Another factor in our orbit is that it keeps us out of Earth's shadow. Our solar panels will always be in the Sun! Hubble goes in and out of Earth's shadow every 90 minutes and Hubble's view is blocked by Earth for part of each orbit, limiting where the telescope can look at any given time. Also, Hubble uses battery power when it is in Earth shadow, because the telescope is not getting sunlight to its solar panels. If you had a satellite permanently in Earth shadow, you would have to power it without use of solar panels/sun 100% of the time.

@npiersanti

2 жыл бұрын

@@NASAWebbTelescope really thank you for detailed explanation.

@TheTboy007

2 жыл бұрын

@@NASAWebbTelescope so why use rocket fuel to stay in orbit? Wouldn't rotating masses be good enough to rotate the telescope?

@olimazi9911

2 жыл бұрын

@@NASAWebbTelescope excellent explanation, thank you

SO COOL !!! Sometimes, humans do the most amazing things....

Would it have been possible to view the Webb from earth in its early days of launch? I saw a very strange light moving in the sky at around 4:23am on Sunday 2 Jan 2022 from South Australia and have been madly trying to determine what it was.

ça y est ! il est en route !

Could anyone please tell me the orbital distance of JWST around the L2 point? I couldn't manage to find it on the web, only the distance of the L2 point from Earth. :)

@brainmind4070

2 жыл бұрын

A quarter of a million miles.

@TheTboy007

2 жыл бұрын

roughly to scale; it is actually similar in size to the Moon's orbit around the Earth! This orbit (which takes Webb about 6 months to complete once) keeps the telescope out of the shadows of both the Earth and Moon.

@mkvv5687

2 жыл бұрын

I can't, but I did find that it takes 6 months to orbit L2.

The orbit is amazing. My intuition tells me that they need the telescope to have a circular motion parallel to the distance towards earth is because they need to make use of paralax effect to measure far away objects. The paralax effect is the apparent displacement of an object because of a change in the observer's point of view. So if you measure the object from 2 points you can say how far away it is.

@mattg2106

2 жыл бұрын

The main reason for the orbit is that it gives it 2 really important things. Firstly it shields the telescope from the sun and from reflected sunlight from both the earth and the moon - all absolutely critical to maintaining the low operating temperature that is needed and allowing it to see stars! (you don't see stars in the day :-). Secondly it gives the back of the telescope permanent sunlight which is critical for the solar arrays located there to power the instruments.

@lebagelboy

2 жыл бұрын

It's actually for two main reasons: 1.) The L2 point is directly in the shade of the earth which means if you were to stay in that spot you'd have no light from the sun hitting the solar panels and therefore no power. 2.) It's easier to get to the L2 and uses less fuel. Destin's SmarterEveryDay channel covered this recently when he interviewed one of the lead scientists on the project. kzread.info/dash/bejne/ZoRsyK2dYKy8f9Y.html I'd imagine the parallax effect would not be large enough from the orbit around L2 on it's own. I'm pretty sure they tend to use much wider orbits for parallax calculations i.e. measuring at opposing points in the earths orbit as an example.

@jimrogers9095

2 жыл бұрын

For parallax, astronomers use distant points in the earth's orbit around the sun; JWST could do the same. The circular motion keeps its backside in the sun all the time, without passing in and out of shadow. That's much better for thermal stability, which is essential for sensitive infrared instruments.

@waynekasmar4401

2 жыл бұрын

To get the parallax effect the whole telescope would have to be flipped around so as to be looking back in the same direction it was looking 6 months earlier. I'm not sure they're going to be doing that.

@maxweber06

2 жыл бұрын

Both these answers are incomplete as they don't mention why there's a circular motion (though it's actually elliptical). The L2 point isn't actually stable; I'd call it pseudo stable, which is very different from metastable. Because of the gravitational effects of the three bodies; the earth, sun, and moon, the region at L2 is shaped like a saddle, gravitationally. So metastable is stable if there isn't any disturbances, pseudo stable is stable given constant course corrections, like a top spinning on its tip, if you where to keep adding rotational energy, it would spin forever. The fuel needed is small and the shade is also good, Matt and Adam are correct about that, but another key thing that most miss is micro meteorites, because it's not a stable point without small bits of thrust, meteorites are unable to enter the region for more than I'd say a couple of days which makes the region fairly void of objects that might puncture the sun shield. Unfortunately, this does add a limit to how long JW can stay at L2, last I heard it's 20 years, though refueling is possible I think, like there's a fuel port. The ship that gets the fuel there hasn't even been designed though and I'm not too sure NASA even wants to refuel JW given L2's prime location.

now in orbit!!!

Is l2 burn insertion burn happing all the time ?

I can't believe we managed to build a telescope many times the size of earth.

@dudess76

2 жыл бұрын

Yeah it's in my backyard

@kraghhertel8202

2 жыл бұрын

I can't believe the remaining terrestrial astronomers signed off on that huge yellow circular trail ruining all their observations. And you thought Starlink was bad? 🤣

So happy to see the JWST in its L2 orbit! What a wonderful achievement of human ingenuity AND perseverance! Can’t wait to see all the new discoveries!!!!

How can the telescope “orbit” an empty point in space? Doesn’t it need a body with gravity to keep it moving in a circle?

@BanWolfHunting

2 жыл бұрын

Never mind, I just found PlanetEvan’s answer in the comments.

How does it remain in a circular orbit. I thought if you apply thrust it would go in a straight line?

Does the plane of the orbit at L2 turn as part of station keeping, precession or something else? Thx for responding.

@mattg2106

2 жыл бұрын

The main reason for the orbit is that it gives it 2 really important things. Firstly it shields the telescope from the sun and from reflected sunlight from both the earth and the moon - all absolutely critical to maintaining the low operating temperature that is needed and allowing it to see stars! (you don't see stars in the day :-). Secondly it gives the back of the telescope permanent sunlight which is critical for the solar arrays located there to power the instruments.

@davefoc

2 жыл бұрын

@@mattg2106 You may have answered a question he didn't ask. I think he is asking why the plane of the orbit around the lagrangian point rotates. I wondered about that as well. I also was curious about whether the actual orbit path is almost stable or if significant engine power is required to keep the telescope orbiting the way it does in the animation.

Good

За счёт каких сил телескоп будет совершать круговые движения в точке L2, свою орбиту будет поддерживать за счет сил притяжения Земли, Луны и Солнца, а круговую в точке L2?

It's awesome when WEBB launches and reaches to the L2 orbit faster than the people deleting their sarcastic comments.

Amazing

How can JWST orbit around L2 point? That point is no mass that can create gravitational attraction on a JWST. It is only the point where the gravitational forces of the Sun and Earth are balanced.

@MrSummitville

2 жыл бұрын

No, the Gravitational Force of the Sun and Earth "add" at L2 ...

@hajii2160

2 жыл бұрын

kzread.info/dash/bejne/aYR82KajZLeqlrA.html

@steveagnew3385

2 жыл бұрын

The JWST is orbiting the sun and earth synchronized with the earth orbit of the sun. However, the JWST is just short of L2 and so is actually falling slowly back to earth in a spiral path called a halo orbit and that spiral is larger diameter than the moon orbit diameter and takes 6 months. Every several weeks, the JWST will need to push itself back toward L2, but never actually to L2, where it will begin to fall back to earth again.

@dadejazzba402

2 жыл бұрын

I know...I think it's orbiting the sun...but needs some momentum to stay put....no forces on it there.

@carlodave9

2 жыл бұрын

It has to do with #1: How the varying pulls of Earth and Sun's gravities act on JW as it hovers shy & well off-center from the actual L2 point (which is almost impossible to stick), #2: The resulting centrifugal forces of Earth & Webb's rotation around the sun, and #3: The regular burns necessary to keep all the forces balanced and the JW optimally positioned. The cumulative effect of these 3 results in the huge halo orbit that keeps JW from flying off into interplanetary space and from getting uncontrollably drawn back towards Earth/Sun gravity. This is a woefully bonehead explanation, but the physics are too complex for easy, intuitive answers. Hope it helps a little.

This would make MORE sense if you animated the Sun, too... I believe doing so would help others understand its erratic pattern.

What a about the data ? what kind of availability will there be for anyone ?

Odd that I'm excited now that all the setup hurdles are in the past and JWST is parked in L2. Very excited to see the clarity of first observations and announcements that hey this exoplanet has a nitrogen and O2 atmosphere with water vapor.

Respect for the camera man who did this video 😂

I've tried and can't understand what makes the telescope stay in halo? What forces pull it down or up? I can see that it sits at that point fairly stably, but not why it moves in Halo without constant fuel burning. Any astrophysicists out there?

I heard the plan to develop successor of then-new Hubble ST when I was studying in graduate school. Now I am near retiring.

Hello JWST! This is a great animation. However, I seem to have a problem downloading the video from the link given in the video description. Could you please perhaps help me as to how I can download this animation? I have been following the journey of the JWST from its launch to all the deployments that had had to happen in order for the telescope to safely reach the L2 point. This has been quite an awesome ride to keep track of the observatory. I would be really grateful if anyone could help me with the download of the video animation... Best

@NASAWebbTelescope

2 жыл бұрын

Hi - here is the link again - if a specific file doesn't work for you, please let us know and we can reach out to the SVS folks: svs.gsfc.nasa.gov/13553 (Email us: GSFC-NASAWebb@mail.nasa.gov)

I can't find anywhere what the orbit distance from L2 is expected to be. Does anybody know?

@MrSummitville

2 жыл бұрын

520,000 km above and below the ecliptic.

Why is there still a circular movment needed when the telescope is in place ? (On the surface perpandicular to the sun-earth axis). Thanks a lot

@TijmenZwaan

2 жыл бұрын

1. Because the telescope needs solar power to work. If it were sitting stationary at L2, it would be in earth's shadow, hence no solar power. 2. Because it takes far less energy to enter an orbit around L2 compared to actually stopping on top of L2.

@MrSummitville

2 жыл бұрын

Would you prefer the Solar Panels to be in the shadow of the Earth?

so the mirror will always be pointing to our north. that should give us long stable exposures into tiny spots spanning months if needed

It looks like it's always point in the same direction but I don't believe that would be true. So how do they aim the thing.?

@MrSummitville

2 жыл бұрын

It points in the direction that NASA tells it to ...

but why does it go up and down, and not just in a circle? o.o

Is this to scale? Will Webb really be that far from l2?

A little more info, please. A voiceover with what L2 is, why it was chosen etc.

@NASAWebbTelescope

3 жыл бұрын

This is just an animation that we wanted to make available, not an edited feature. You can find more information on our orbit here: jwst.nasa.gov/content/about/orbit.html

Omg.... WEEEeeeee..... WEEeeeeee

I’m wondering why it doesn’t just stay still at the orbital position?

How can it face always opposite to the Sun? Does this require fuel or is it a property of this halo orbit?

@MrSummitville

2 жыл бұрын

It has fuel and thrusters

How exactly does it orbit that point like that if there aren’t any massive bodies?

@NASAWebbTelescope

3 жыл бұрын

The Lagrange points are actually special in this way. The Lagrange points were solutions to a mathematical problem called the "three-body problem." The question being, are there any stable configurations, in which three bodies could orbit each other, yet stay in the same position relative to each other? As it turns out, there are five solutions to this problem - and they are called the five Lagrange points, after their discoverer. At Lagrange points, the gravitational pull of two large masses precisely equals the centripetal force required for a small object to move with them. It is easy for an object (like a spacecraft) at one of these five points to stay in place relative to the other two bodies (e.g., the Sun and the Earth). In fact, L4 and L5 are stable in that objects there will orbit L4 and L5 with no assistance. Some small asteroids are known to be orbiting the Sun-Earth L4 and L5 points. However, L1, L2, and L3 are metastable so objects around these points slowly drift away into their own orbits around the Sun unless they maintain their positions, for example by using small periodic rocket thrust. This is why L1, L2, and L3 don't "collect" objects like L4 and L5 do. Webb will be at L2 - it will actually be orbiting this point in space instead of sitting at it, because it actually takes less energy to orbit L2 than to try to sit at it (because of L2 being only metastable). Hope this helps! Read more: jwst.nasa.gov/content/about/orbit.html solarsystem.nasa.gov/resources/754/what-is-a-lagrange-point/

@noahzeitlin6850

3 жыл бұрын

@@NASAWebbTelescope I wasn’t expecting a reply from you guys! This is amazing!! This helped a lot, thanks a ton!!!

@roiabrazaldo4822

2 жыл бұрын

@@NASAWebbTelescope thanks

Since it’s not orbiting around an object @ L2... wouldn’t it need to expend fuel to keep it circling around the spot itself??

@quantumblur_3145

2 жыл бұрын

L2 is a Lagrange point

@MrSummitville

2 жыл бұрын

@Blob B It is not orbiting the Earth. It is orbit the sun.

is this to scale?

What are the chances that it would not stick in this orbit? it sounds mind-blowing and crazy to me, 7 months to go to find out! :D

@shmookins

3 жыл бұрын

It has to re-position itself constantly because that orbit isn't stable. That means the mission will end as soon as it runs out of fuel. The instruments can actually work for much longer but it just has a finite amount of fuel to keep itself in that unstable orbit. Although they made handles around a refueling hatch for a future robot mission to go to it and refuel it, there are no plans at all for such a future re-fueling mission. NASA said if the launch and initial positioning goes efficiently, then the mission life can be extended a bit. If not, it has to waste even more fuel correcting itself getting to location which will mean a shorter mission life. James Webb is to have a lifespan no less than 5 1/2 years but the goal is to extend that over 10 years. Fingers crossed!

@shreyasj4502

2 жыл бұрын

@@shmookins yeah , there's one docking ring maybe for potential use 🤔

@vkobevk

2 жыл бұрын

it should be fine for 10 years 😊

@msittig

2 жыл бұрын

@@shmookins (nine months later) I read on Wikipedia that the launch went very well and the Webb space telescope has enough fuel to possibly double the life of the mission.

Now if we had a special plug-in for the stelarium program so we can see where it is at least, even if we can't see it with the naked eye. It's "special" orbit is going to need som accomodation though. :-)

@NASAWebbTelescope

2 жыл бұрын

If you go to jwst.nasa.gov/content/webbLaunch/whereIsWebb.html and click on "Webb in 3D Solar System," we have that feature embeded via Eyes.nasa.gov.

"So yeah, we figured out a way to orbit nothing at all"

I don't understand, it goes back and forward? Can somebody help pls

@amatullahshahidi9503

3 жыл бұрын

Nah it's always horizontally moving And Vertically too So it looks like it's just circling around one point but it's actually orbiting the sun with Motion Like our earth does with just horizontal motion The orbit type is L2 You can find more about it on internet

What is L2?

I can't find anywhere the answer to this question, how long will one halo orbit be around the L2 point? By slowing down this animation, near the beginning when we see JWST at the top of its orbit, I see where Earth is. The next time it's at the top of its orbit, Earth looks to be pretty close to the exact opposite side of the sun. Ergo, it seems it takes 6 months for the telescope to make one orbit around L2. That assumes this animation is accurate. Does anyone know for sure? Again, I've looked at many sites, and nowhere states a length of time for one orbit around L2.

@msittig

2 жыл бұрын

The "Orbit - Design" section of the James Webb Space Telescope wikipedia article has some animations that show the orbit and dates/times, which also point to a ~6 month period for the L2 halo orbit.

@gordonh113

2 жыл бұрын

Hey Jeff. The link above about the orbit has good content, including that it will take about six months for the orbit around L2, so the animation seems consistent. I was trying to figure out how fast will Webb be traveling. That webpage also says that Webb will be about as far away from L2 as the Moon is from the Earth. So using rough numbers, if the radius of the orbit around L2 is about 240,000 miles and therefore the length of the orbit (if it's a perfect circle) is about 1,500,000 miles (2 x pi x 240k), and if it takes 180 days to make the orbit, then Webb will be traveling at about 350 mph (about 560 kph). Most of you are better than me at math, or maybe someone has better info about the orbit, so maybe someone can correct me. Anyway 350 mph seems nice and slow compared to Hubble which I believe travels at about 17,500 mph.

Knowledge

Exciting times. But I have to ask, at a cost of 10 billion over two decades, why not incorporate additional propulsion to allow for servicing, repair. The ability to move the JWST within reach of astronauts seems worthy of a 10 billion dollar telescope.

Where can I see the approach to L2?

@mb77005

2 жыл бұрын

If you go outside and squint hard enough you can watch it.

Are we still on for an October 2021 launch?

@NASAWebbTelescope

3 жыл бұрын

Yes! Our next steps include a final mirror deployment before the telescope gets packed up and shipped to the launch site in French Guiana!

@davejones542

3 жыл бұрын

@@NASAWebbTelescope awesome

What is the source of "Centripetal Force" here??Can anyone clear it???

@thanesgames9685

2 жыл бұрын

Just the momentum given to Webb vs. the gravitational attractions of the earth and sun in balance with each other.

@vkobevk

2 жыл бұрын

gravity from earth and sun and fuel to stay in the orbit

Поздравляю!

As L2 is an empty space, why would the telescope orbit a massless point?

900 km left to the point.

I wish the sideways perspective was three times as long.

One and a half an hour till L2 injection.

Nearly there ..

I have a question. I understand that the telescope is orbiting the sun, but why is its orbit more complex than Earth's? I'm questioning its wavy motion compared to the Earth's very flat orbit. And what provokes it to move in that manner?

@Phoenix80675

Жыл бұрын

It's orbiting earth which is orbiting the sun so it's moving the same direction as earth but with the vertical oscillation from it's orbit around the earth

@oberonpanopticon

4 ай бұрын

@@Phoenix80675actually it’d orbiting the earth-sun L2 point. It’s a complicated physics thing. There’s some great videos about it.

I always thought it was at the L point between the Earth and the Sun. Now I know!

How Webb is always facing the Earth/Sun? Does it have to spin?

@Stogie2112

2 жыл бұрын

The telescope never faces the earth or the Sun. The telescope has to operate in extreme cold and darkness, therefore, it must point away from the Sun at all times, and it must be shielded at all times.

@weekiely1233

2 жыл бұрын

It’s always facing away from the sun and earth not towards

One thing which I couldn't understand.If it never faces the Sun 🌞 then how it gets powered.🤔

I would wait another 15 years uno to ,make sure its all good....

Why does it orbit that point in L2 while also orbiting the sun? Why isn't it stationary in it's orbit?

@NASAWebbTelescope

3 жыл бұрын

L2 is not actually a stable point (it's semi-stable), so you can't just park there. Trying to sit right at it would take more energy than orbiting it.

@vaughngaminghd

2 жыл бұрын

@@NASAWebbTelescope Is it the "gravity well" that creates the focal point of that secondary orbit? It's hard to understand what's holding it in place…

@MrSummitville

2 жыл бұрын

@Mark Stanton - L2 is in the shadow of the Earth. That is problem for the Solar Panels!

2022