by neufer » Mon Sep 23, 2013 12:24 pm
starsurfer wrote:xmetman wrote:
Why is this image so much different to the one in 2006?
http://apod.nasa.gov/apod/ap061020.html
I can't see any immediate similarities in the two images. I know they are put together from images of different wavelengths and they are some times zoomed up and flipped but this one beats me.
This image combines exposures taken with the Very Large Telescope at the European Southern Observatory with old data taken by Martin Pugh. The reason it looks different is it combines amateur colour data taken with a small telescope with more detailed exposures of the structure taken with a very large telescope, so obviously there is going to be more resolution.
http://en.wikipedia.org/wiki/VLT_Survey_Telescope wrote:
<<The VLT Survey Telescope (VST) is the latest telescope to be added to ESO’s Paranal Observatory in the Atacama Desert of northern Chile. It is housed in an enclosure immediately adjacent to the four Very Large Telescope (VLT) Unit Telescopes on the summit of Cerro Paranal. The VST is a wide-field survey telescope with a field of view twice as broad as the full Moon. It is the largest telescope in the world designed to exclusively survey the sky in visible light.
The VST is an alt-azimuthal wide-field survey telescope with a primary mirror diameter of 2.65 meters (comparable to Hubble's 2.4 meters) that was constructed from 2007-2011 at the ESO Cerro Paranal Observatory, in Chile. With a field of view of one square degree (i.e., 3600” x 3600” vs. 160”x160” for Hubble's Wide-Field Camera 3), its main scientific role is as a wide-field imaging instrument for exploring the large-scale structure of the universe (as visible from the southern hemisphere), able to identify the most suitable candidates for detailed examination by the VLT. Together with its camera OmegaCAM, the VST is able to obtain a high angular resolution (0.216 arcsec/pixel vs. Hubble's resolution of ~0.05 arcsec), and it is capable of performing stand-alone survey projects in the visible part of the spectrum.
The second released VST image may be the best portrait of the globular star cluster
Omega Centauri ever made. Omega Centauri, in the constellation of Centaurus (The Centaur), is the largest globular cluster in the sky, but the very wide field of view of VST and its powerful camera OmegaCAM can encompass even the faint outer regions of this spectacular object. The view includes about 300,000 stars.>>
[quote="starsurfer"][quote="xmetman"]
Why is this image so much different to the one in 2006?
[url]http://apod.nasa.gov/apod/ap061020.html[/url]
I can't see any immediate similarities in the two images. I know they are put together from images of different wavelengths and they are some times zoomed up and flipped but this one beats me.[/quote]
This image combines exposures taken with the Very Large Telescope at the European Southern Observatory with old data taken by Martin Pugh. The reason it looks different is it combines amateur colour data taken with a small telescope with more detailed exposures of the structure taken with a very large telescope, so obviously there is going to be more resolution.[/quote]
[list]Not the [b]V[color=#FF0000]L[/color]T[/b] per se but the smaller 2.65 m [b]V[color=#0000FF]S[/color]T[/b]: the [url=http://asterisk.apod.com/viewtopic.php?t=32164]VLT Survey Telescope[/url] (which didn't even exist in [url=http://apod.nasa.gov/apod/ap061020.html]2006[/url]).[/list]
[quote=" http://en.wikipedia.org/wiki/VLT_Survey_Telescope"]
[float=right][img3="[b][color=#0000FF]The first released VST image shows [size=150]the Swan Nebula[/size], as it has never been seen before. This vast region of gas, dust and hot young stars lies in the heart of the Milky Way in the constellation of Sagittarius (The Archer). The VST field of view is so large that the entire nebula, including its fainter outer parts, is captured — and retains its superb sharpness across the entire image. [/color][/b]"]http://upload.wikimedia.org/wikipedia/commons/thumb/7/7f/VST_image_of_the_spectacular_star-forming_region_Messier_17_%28Omega_Nebula%29.jpg/600px-VST_image_of_the_spectacular_star-forming_region_Messier_17_%28Omega_Nebula%29.jpg[/img3][/float]<<The VLT Survey Telescope (VST) is the latest telescope to be added to ESO’s Paranal Observatory in the Atacama Desert of northern Chile. It is housed in an enclosure immediately adjacent to the four Very Large Telescope (VLT) Unit Telescopes on the summit of Cerro Paranal. The VST is a wide-field survey telescope with a field of view twice as broad as the full Moon. It is the largest telescope in the world designed to exclusively survey the sky in visible light.
The VST is an alt-azimuthal wide-field survey telescope with a primary mirror diameter of 2.65 meters (comparable to Hubble's 2.4 meters) that was constructed from 2007-2011 at the ESO Cerro Paranal Observatory, in Chile. With a field of view of one square degree (i.e., 3600” x 3600” vs. 160”x160” for Hubble's Wide-Field Camera 3), its main scientific role is as a wide-field imaging instrument for exploring the large-scale structure of the universe (as visible from the southern hemisphere), able to identify the most suitable candidates for detailed examination by the VLT. Together with its camera OmegaCAM, the VST is able to obtain a high angular resolution (0.216 arcsec/pixel vs. Hubble's resolution of ~0.05 arcsec), and it is capable of performing stand-alone survey projects in the visible part of the spectrum.
The second released VST image may be the best portrait of the globular star cluster [url=http://upload.wikimedia.org/wikipedia/commons/thumb/5/5d/VST_image_of_the_giant_globular_star_cluster_Omega_Centauri.jpg/1024px-VST_image_of_the_giant_globular_star_cluster_Omega_Centauri.jpg]Omega Centauri[/url] ever made. Omega Centauri, in the constellation of Centaurus (The Centaur), is the largest globular cluster in the sky, but the very wide field of view of VST and its powerful camera OmegaCAM can encompass even the faint outer regions of this spectacular object. The view includes about 300,000 stars.>>[/quote]