Questions tagged [james-webb-space-telescope]

NASA's James Webb Space Telescope (JWST) is an infrared space observatory that launched on Dec 25, 2021. It is the largest and most powerful space telescope to date.

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Why does the alignment evaluation image from JWST look like this?

NASA has just released a telescope alignment evaluation image from JWST for the star HD 84406 2MASS J17554042+6551277. It looks like this: Higher resolution at Wikipedia To my untrained eye, the star ...
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Gravitational mirroring: Can we theoretically see the Milky Way using a telescope?

As I am watching the beautiful deep field picture of the James Webb Space Telescope. I noticed the gravitational lensing. So I asked myself whether it is possible somehow a successive cluster of ...
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If I can't unscramble an egg, how do Astronomers unscramble views gravitationally lensed by complex mass distributions?

Quanta Magazine's Two Weeks In, the Webb Space Telescope Is Reshaping Astronomy highlights two submissions to arXiv soon after the first images were released: "Three days later, just minutes ...
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Will the James Webb Space Telescope be visible from earth?

Once the JWST is in orbit around L2, would it be possible to view it using any ground based telescopes? I’m mostly thinking of equipment available to amateurs, since I don’t have a 10m reflector. But ...
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Why will HD 84406 be chosen as the first target for testing JWST?

HD 84406, is a star approximately 241 light-years away in the constellation of Ursa Major. HD 84406 will be the first star to be imaged by the James Webb Space Telescope in order to test the focus of ...
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Has the small meteorite that hit Webb done a lot of damage?

I read on the web about Webb: A tiny meteoroid struck the newly deployed James Webb Space Telescope in May, knocking one of its gold-plated mirrors out of alignment but not changing the orbiting ...
Felicia's user avatar
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Has NASA released any JWST images of Trappist-1? If not, why?

According to JWST weekly schedules (found here), the Trappist-1 system was among the telescope's targets during early July. The only JWST image of an exoplanet in the Trappist-1 system that I've ...
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Could the James Webb Space Telescope detect biosignals on exoplanets?

The James Webb Space Telescope (JWST) which is slated to launch in 2018 will bring us a better view of exoplanets, but will it be sufficient to detect signs of life on at least some of those worlds? ...
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Which JWST instrument modes are compatible with observations of the bright trans-Earth planets Mars, Jupiter, and Saturn? Which aren't?

My comment says: ...answers to the Space SE question Can James Webb take pictures of our solar system? In what ways will they differ from/compliment those from Hubble? suggest that at some point JWST ...
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How will microshutter arrays be used in the James Webb and future space telescopes?

Question: How will microshutter arrays be used in the James Webb and future space telescopes? Are they acting as a sort of moving pinhole or slit, or is the pattern more complicated, like a coded ...
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Can JWST be damaged by looking at a bright star?

Can JWST be damaged by looking at a bright star? The Sun as well as particularily bright solar-system objects like Jupiter, Venus or the Moon not meant with this question.
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How many light seconds away is the JWST?

The processing for JWST's alignment is done on Earth. How long does it take for a signal from Earth to reach the JWST?
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Parking a telescope at a Lagrange point: is this a good idea from a debris point of view?

The James Webb space telescope is supposed to be located at the Earth-Sun L2 Lagrange point. Do we expect the region around that point to have a higher concentration of space debris, asteroids, dust,...
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What visual artifacts are expected from the JWST?

What visual artifacts should we expect from the images that will be released from the James Webb Space Telescope? Specifically, do we expect 3-pronged diffraction spikes (any preview how they would ...
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Will James Webb see Population III stars?

I have heard that James Webb will see the first stars that our universe produced. Can I assume that we may see galaxies that are so young that all of the stars in them are population III?
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Will JWST be as durable as the hubble telescope?

JW Space Telescope is designed for a 5-10 year mission duration. Seeing as Hubble and other space missions have paved the way for JWST for reliability issues, It even has zero friction gyro's with 100+...
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Why not build a swarm of space telescopes?

James Webb Space Telescope (JWST) has not yet started doing science, yet its successor LUVOIR is being discussed already. However I am curious; some countries have invested billions of dollars in ...
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What is this bright blue object taken by the Webb telescope?

From NASA - New Webb Image captures clearest view of Neptune's rings in decades: Does anyone know what the bright blue on the left top corner of the picture is? It is a reflection of sorts or is it a ...
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JWST mirrors each can be "positioned in tip, tilt, piston, horizontal & vertical decentering and clocking". What does this mean?

This interesting paper by Robert Warden refers to each mirror segment on JWST as having six actuators providing six degrees of freedom in positioning (plus one more to tweak the curvature). These ...
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Is this scaling of JWST halo reasonably correct

After thinking about accurately visualizing the size of the Andromeda galaxy I began to wonder about the halo orbit of the James Webb Space Telescope. Using an estimate of 1.5E6 km for halo width and ...
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Webb data pipeline explanations e.g. using the first five images?

The first 5 stunning results from the Webb Space Telescope are now available! And the raw data is available for them, e.g. via bulk download scripts or via the Mikulski Archive for Space Telescopes (...
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Is pointing a telescope at a random place a viable astronomical strategy?

Recently I happened to be on the MAST portal, looking at jwst data. I happened to come across 2 interesting targets, “random place” and “another random place” This got me thinking. It’s almost ...
Topcode's user avatar
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What exactly is the risk to any JWST instrumentation when looking at objects that are "too bright"?

This answer by pela to question #48317 at one point states The star should be bright, but probably not too bright (like Betelgeuse), since we don't want to burn MIRI off from the beginning A comment ...
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What does the celestial sphere look like in thermal IR?

The Space SE question JWST detector heat load asks ...what is the heat load from the collected radiation of the main mirrors on the detector, and how does that vary depending on what objects or ...
uhoh's user avatar
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What is the fraction of the time that the JWST could view a short transient event on-demand as a function of position on the celestial sphere?

In this answer to Why does JWST have such a big Blind Spot? I argue that this space telescope primary relationship with time is that it strives to look way back in it and so as long as a given ...
uhoh's user avatar
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2 votes
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How tall are the pillars of creation? (angular and physical) How bright are they? [duplicate]

NASA's October 19, 2022 NASA’s Webb Takes Star-Filled Portrait of Pillars of Creation shows a sparkly and beautiful infrared image of the Astronomical elephant trunks known as the Pillars of Creation. ...
uhoh's user avatar
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Were K2-141b and WASP-63b selected as the first two exoplanet atmospheres for JWST to look at during its first year of observations? If so, why?

In The Observatory @Donald.McLean linked to Scientists will peer at first galaxies with James Webb telescope which says in part: The new telescope will augment science performed by Hubble, not ...
uhoh's user avatar
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Why are diffraction spikes left in JWST public images?

First released JWST images are amazing. However, given the amount of image processing, false colours, cleanup etc. that must have gone into these images, why not also remove or reduce the diffraction ...
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Why not launch a few more copies of JWST?

The James Webb Satellite seems to be a highly successful project and it looks like humanity will get useful observations from it for many decades to come. But the question is... why not make 3 more ...
JonathanReez's user avatar
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Will JWST have fewer observing sessions of much longer duration compared to Hubble?

In The Observatory @Donald.McLean linked to Scientists will peer at first galaxies with James Webb telescope which says in part: Many of the proposed tasks for the Webb telescope were planned and ...
uhoh's user avatar
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0 votes
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What percentage of visible stars will JWST be able to survey over the next 10 years?

The James Webb telescope is projected to stay operational over the next 10 years. During this time, what percentage of the visible universe/stars will it be able to survey? Of course, technically the ...
JonathanReez's user avatar
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Does the other side of the Big Bang factor into JWST observations?

Our (roughly) 13.6 billion light year view to the point of origin (big bang) is just along a radial axis. Assuming most matter ejected in a (roughly) spherical pattern, the diameter of the universe is ...
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