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Questions tagged [james-webb-telescope]

Large, near infrared and visible space telescope going to Earth–Sun L2 around 2021 using extensive heat shielding and robotic techniques and comprised of 18 individually-deformable primary mirror segments.

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Can James Webb see Kuiper Belt Objects like 2014 MU69 (Ultima Thule)?

In this paper, we learned that Hubble is the only telescope in the vicinity of Earth that can detect Ultima Thule directly. Hubble will eventually fail, and will be somewhat replaced by James Webb. ...
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Why are so many space telescopes placed in LEO instead of at Lagrange Points? And why do we hear about Hubble more than any Langrange-orbit telescope?

Here is the list of every space telescope launched by different space agencies - List of space telescopes. Most of the listed telescopes are placed in Lower Earth Orbit (about 95% of them). It's ...
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Can/Will the James Webb Telescope maintain its position passively?

A recent article about the telescope states (emphasis mine): Unlike Hubble, which orbits the Earth at about 340 miles of altitude, Webb will be sent almost a million miles into space, at a ...
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What were Hubble's jerk and jounce limits? Did JWST have the same?

From Wikipedia: In physics, jerk is the rate of change of acceleration; that is, the derivative of acceleration with respect to time, and as such the second derivative of velocity, or the third ...
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How much would the James Webb Telescope have cost of they made two or ten of them instead for example? [duplicate]

How much could you cut the price by "mass" producing (at least more than one sample) explorer spacecraft (Galileo, Cassini, New Horizon, Dawn...), space telescopes (Kepler, TESS...) and satellites? ...
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What type of information can be gathered from a plot of brightness against wavelength?

While reading this paper about the possibilities JWST will provide to study Titan, I have come across a graph that plots brightness (not sure what units it is in) against wavelength in micron. Here it ...
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Recommended source for familiarizing oneself with the applications of spectroscopy in planetary science

I have recently entered the field of planetary science as a limited-scope project which is part of my masters' degree in chemistry. My project is going to revolve around Titan and its complex organic ...
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Will the James Webb Space Telescope be insured against launch failure?

Most commercial satellites are insured in case something happens on launch. Although the Ariane 5 is a fairly reliable rocket, a launch failure is not out of the question. While other questions have ...
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JWST observing cherry red Tesla roadster

Assuming both launches are successful, if JWST tries to solve Tesla's cherry red body paint light spectrum, what would it tell about it's composition? Could it be confusing if it was an unknown object?...
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What are the sources of light at L2? How will the James Webb telescope be powered?

The James Webb space telescope will be positioned very close to L2. According to JPL, Webb will have a large solar-array to power itself. I don't understand how this works, since L2 is positioned "...
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What happens to JWST after it runs out of propellant?

JWST will be orbiting L2 which is unstable equilibrium thus will require propellant for station keeping. JWST will carry propellant for 5-10 years. What will happen once it runs out of propellant? ...
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Why isn't the JWST mirror bigger?

What's behind the choice of not designing the largest possible folding mirror for the James Webb space telescope, since something like a 13m diameter mirror could also fit in Ariane's fairing?
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How common is it for spacecraft to have “selfie” capability?

According to ESA: A sudden small power reduction was observed in a solar array of Sentinel-1A, orbiting at 700 km altitude, at 17:07 GMT on 23 August. Slight changes in the orientation and the ...
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Why would the James Webb Space Telescope need adaptive optics outside the atmosphere?

Adaptive Optics is generally used with ground telescopes to correct for atmospheric distortions or seeing. Right now it is used mostly in the infrared but is starting to be used in longer visible ...
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Can the James Webb Space Telescope basically manage its own orbit if necessary?

In this great answer I learned that the Mars rover Curiosity can be given some tasks and it will go ahead and manage the work and navigation by itself, to at least a certain limit. The James Webb ...
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How can the 6.5 m primary mirror of the JWST fit inside the 5.4 m fairing of Ariane 5?

All the variants of the payload fairing for Ariane 5 are 5.4 meters in diameter, the same as the core stage of the rocket. At the same time, the mirror of the James Webb Space Telescope is 6.5 meters. ...
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How will JWST be serviced?

Hubble, besides the initial high-profile COSTAR, was upgraded many times giving essentialy a new instrument with the same heavy/expensive glass. It was set in LEO for that purpose even though it has ...
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What savings allowed James Webb telescope to be lighter than Hubble?

Wikipedia states: The telescope has an expected mass about half of Hubble Space Telescope's, but its primary mirror (a 6.5 meter diameter gold-coated beryllium reflector) will have a collecting ...
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What kind of space telescope would be needed to detect oxygen in the atmosphere of a nearby extrasolar planet?

Would existing or upcoming telescopes (such as James Webb) be powerful enough to perform spectroscopy on an extra solar planet? Or would this require technology that is far beyond our current or ...
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How much of the sky can the JWST see?

According to the JWST FAQ: To turn and point at different objects in space, Webb uses six reaction wheels to rotate the observatory. The reaction wheels are basically flywheels, which store angular ...
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Will the James Webb telescope have any visible spectrum cameras?

The telescope itself will operate in wavelengths from 0.6 µm (orange) to 28.5 µm (mid-infrared), so it reaches a bit into the visible spectrum, but it's still going to be aimed away from Earth, and ...
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Does the JWST have a camera to monitor its deployment progress?

The James Webb Space Telescope has a complicated deployment sequence. Beyond data from sensors aboard the spacecraft, does it have any cameras to take pictures of the process?
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Why won't JWST deploy in LEO where it is potentially serviceable?

The James Webb Space Telescope will deploy (unfold mechanically) while on the way to L2. Couldn't it do so in LEO, where it is potentially serviceable? Starliner CST-100 and Dragon are planned to soon ...
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What kind of thrusters will the James Webb Space Telescope use for station keeping?

Question is fairly self-explanatory, but I couldn't find an answer on Google. I would expect ion thrusters because of their efficiency. Thanks!
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The JWST - What happens if/when it breaks?

The James Webb Space Telescope (JWST) project could be fantastic, It has the promise of seeing farther than Hubble, almost to the beginning of our space/time. But, orbiting at L2 - while closer by ...
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Aren't the mirrors of the James Webb Space Telescope too unprotected?

I've looked at the design of the James Webb Space Telescope and I got curious about something, some years ago, it seems that the international space station was hit by micro-meteorites. I'm wondering ...
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Why should the James Webb Space telescope stay in the unstable L2?

We all know that James Webb Space telescope is planned to be launched in 2018. It has been decided that the orbit of JWST will be elliptical around the Lagrange point L2, which has been declared as ...