Gfamily Posted July 12, 2022 Share Posted July 12, 2022 2 minutes ago, Ouroboros said: Would I be right to assume that the narrow band filters select for emissions from particular elements? Hard to tell. If there's any real amount of red shifting in the target, it would be a lucky chance to get a spectral line matching the narrowband filter passband - so I would be sceptical that it would have any use for real far field targets. However, there may be some value for exoplanet atmospheric analysis, but I don't have any knowledge of what those spectra look like. [ A little knowledge is a dangerous thing, so anything I suggest could well come with a Hazmat warning] 1 Link to comment Share on other sites More sharing options...
Ouroboros Posted July 12, 2022 Share Posted July 12, 2022 Just now, Gfamily said: Hard to tell. If there's any real amount of red shifting in the target, it would be a lucky chance to get a spectral line matching the narrowband filter passband - so I would be sceptical that it would have any use for real far field targets. However, there may be some value for exoplanet atmospheric analysis, but I don't have any knowledge of what those spectra look like. [ A little knowledge is a dangerous thing, so anything I suggest could well come with a Hazmat warning] Yes, point taken about red shifting. I hadn’t bought of that. Link to comment Share on other sites More sharing options...
DaveS Posted July 12, 2022 Share Posted July 12, 2022 I seem to remember when I was looking at the Liverpool Telescope that they has several "H-alpha" filters with wavelengths adjusted for different redshifts. 1 Link to comment Share on other sites More sharing options...
Richard_ Posted July 12, 2022 Share Posted July 12, 2022 If you want to compare Hubble images with James Webb images, visit the below website. The two images are overlapped and you can move a slider to see Hubble or James Webb. Absolutely amazing! https://johnedchristensen.github.io/WebbCompare/ 7 1 Link to comment Share on other sites More sharing options...
Sunshine Posted July 12, 2022 Share Posted July 12, 2022 Thanks for the link, it’s amazing! 1 Link to comment Share on other sites More sharing options...
RobertI Posted July 12, 2022 Share Posted July 12, 2022 30 minutes ago, Richard_ said: If you want to compare Hubble images with James Webb images, visit the below website. The two images are overlapped and you can move a slider to see Hubble or James Webb. Absolutely amazing! https://johnedchristensen.github.io/WebbCompare/ Excellent - I’m bookmarking that one! 1 Link to comment Share on other sites More sharing options...
bomberbaz Posted July 12, 2022 Share Posted July 12, 2022 31 minutes ago, Richard_ said: If you want to compare Hubble images with James Webb images, visit the below website. The two images are overlapped and you can move a slider to see Hubble or James Webb. Absolutely amazing! https://johnedchristensen.github.io/WebbCompare/ they showed it at the reveal today, superb 1 Link to comment Share on other sites More sharing options...
wimvb Posted July 12, 2022 Share Posted July 12, 2022 (edited) Fun facts I just checked some technical data on the jwst. fl 131.4 m D 6.5 m (F-ratio of 20! That’s one slow looking glass) Mirrors coated with 0.1 um or a total of 48 grams of gold. That should be the cheapest part of the whole telescope. Apparantly the various instruments have a fov of about 1-2 arc minutes, the angular span of a ”grain of sand at arms length”. To me, that makes the deep field image even more impressive. Edited July 12, 2022 by wimvb 2 Link to comment Share on other sites More sharing options...
Padraic M Posted July 12, 2022 Share Posted July 12, 2022 11 minutes ago, wimvb said: Apparantly the various instruments have a fov of about 1-2 arc minutes, the angular span of a ”grain of sand at arms length”. To me, that makes the deep field image even more impressive. Someone on the NASA broadcast today said something like "we can't capture dark space" which I took to mean that wherever JWST was pointing, that 1-2 arcminutes (squared) is full of galaxies. That's a lot of galaxies. Link to comment Share on other sites More sharing options...
Gfamily Posted July 12, 2022 Share Posted July 12, 2022 33 minutes ago, wimvb said: Apparantly the various instruments have a fov of about 1-2 arc minutes, the angular span of a ”grain of sand at arms length”. To me, that makes the deep field image even more impressive. Imagine the SMACS 0723 image is up on someones iphone screen. Now imagine them standing on the goal line of a football pitch and you're on the other goal line. That's the view. Hard to believe. 5 Link to comment Share on other sites More sharing options...
The Lazy Astronomer Posted July 12, 2022 Share Posted July 12, 2022 Is it weird the thing I want to know most is their noise reduction routine? 😅 1 Link to comment Share on other sites More sharing options...
Gfamily Posted July 13, 2022 Share Posted July 13, 2022 (edited) I'm not sure of this has been posted, but there's a rather splendid gallery of images available now. https://webbtelescope.org/resource-gallery/images 247 lovely images of which the first 15 are recent, and well worth exploring. Edited July 13, 2022 by Gfamily 1 Link to comment Share on other sites More sharing options...
Sunshine Posted July 13, 2022 Share Posted July 13, 2022 (edited) What boggles my mind about the deep field image is the galaxy count. Take for instance this run of the mill sample, are these galaxies even catalogued? how far away is/was this particular galaxy and does it still look like this? could it have collided with a neighbor and been ripped apart and we won’t see it for another how many billions of years? astounding image, I couldn’t be happier after closely following Webb progress for eight years now. It’s easy to forget that these disc shaped fuzzy patches are entire galaxies, GALAXIES!! each containing billions of stars which during their billions of year long evolutions could have been the birthplaces of who knows how many worlds and even forms of life on these worlds around their countless stars. How many civilizations could have come and gone within these galaxies in this one image? it would be incredibly naive to believe otherwise. When one looks at this image in high resolution and zooms in on these galaxies one by one, picking one out, it is impossible not to wonder what it’s stars have given birth to, if in doubt just think about what our star has managed. Edited July 13, 2022 by Sunshine 10 Link to comment Share on other sites More sharing options...
DaveS Posted July 13, 2022 Share Posted July 13, 2022 More in depth on Thursday 2 2 Link to comment Share on other sites More sharing options...
Alien 13 Posted July 13, 2022 Share Posted July 13, 2022 31 minutes ago, DaveS said: More in depth on Thursday Nothing like a slice of Dr Becky to start the day, thanks. Alan 3 Link to comment Share on other sites More sharing options...
wimvb Posted July 13, 2022 Share Posted July 13, 2022 3 hours ago, Sunshine said: are these galaxies even catalogued? Most likely not. Catalogues are based on deep sky surveys, and these are done with much lower resolution, both from space telescopes and ground based telescopes. The fov of the jwst is much too small for use as a survey telescope. No doubt that the images that the jwst delivers will be used to catalogue the galaxies in them, but that will only cover "grains of sand" spread out over the celestial sphere. The "nearby" galaxies that act as gravitational lenses in the jwst deep field are at the edge of what amateur telescopes can image today. But at the fl that we use, these galaxies are only a few pixels across, and even these are not always identified in catalogues. 1 Link to comment Share on other sites More sharing options...
Robert Hayes Posted July 13, 2022 Share Posted July 13, 2022 My image Stephans and the Webb one. Guess you do get what you pay for lol. webb short-1.mp4 4 2 Link to comment Share on other sites More sharing options...
Macavity Posted July 13, 2022 Share Posted July 13, 2022 (edited) 55 minutes ago, Alien 13 said: Nothing like a slice of Dr Becky to start the day, thanks. Quite so! Gone are the days when scientific firsts were "ugly folks" clustered round an oscilloscope at 2 a.m. waiting for some "blip" on the two traces to coincide. (True story. lol) 🥳 🇬🇧 "Oh... There it is... That's jolly good... Fancy a PINT, Chaps"? 🍻 Edited July 13, 2022 by Macavity 5 Link to comment Share on other sites More sharing options...
Laurieast Posted July 13, 2022 Share Posted July 13, 2022 Did it say somewhere that images will be released on a weekly basis? Can't find it now... Link to comment Share on other sites More sharing options...
bomberbaz Posted July 13, 2022 Share Posted July 13, 2022 1 hour ago, Laurieast said: Did it say somewhere that images will be released on a weekly basis? Can't find it now... tHINK i READ IT SOMEWHERE TOO, can't find it either Link to comment Share on other sites More sharing options...
Laurieast Posted July 13, 2022 Share Posted July 13, 2022 2 minutes ago, bomberbaz said: tHINK i READ IT SOMEWHERE TOO, can't find it either Or, was it during that tv presentation, I sort of think now ...🤔 But not watching that again. Link to comment Share on other sites More sharing options...
Jamgood Posted July 13, 2022 Share Posted July 13, 2022 2 hours ago, Laurieast said: Did it say somewhere that images will be released on a weekly basis? Can't find it now... I heard the same. They said it in one of the live shows. 1 Link to comment Share on other sites More sharing options...
Stu Posted July 13, 2022 Share Posted July 13, 2022 Not sure if this link has been posted here yet, so my apologies if it has. Gives a very good comparison between Hubble and Webb images. https://johnedchristensen.github.io/WebbCompare/ 5 1 Link to comment Share on other sites More sharing options...
Swoop1 Posted July 13, 2022 Share Posted July 13, 2022 The carina Nebula has just become my wallpaper. Beautiful image. 2 Link to comment Share on other sites More sharing options...
gorann Posted July 13, 2022 Share Posted July 13, 2022 (edited) I have not followed all the entries on this thread, so maybe this has been discussed: JWST is an IR telescope and I got quirious. Has anyone here tried IR astrophotogtaphy? Googling it gives rather few entries, but this one got me interested: https://www.cloudynights.com/topic/554666-nirha-preview-of-horsehead-project/ Edited July 13, 2022 by gorann Link to comment Share on other sites More sharing options...
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