by geckzilla » Mon Sep 16, 2013 3:40 pm
Rick wrote:ta152h0 wrote:caramba, I am speechless. The big pooobahs at APOD hit one out of the park. Time for an ice cold one to stop the vibrations
Second one out of the park, then. Word for word identical, just re-processed picture. (well, not "just", but you see what I mean)
The 2002 APOD actually an image which uses data from 1997. That's 5 years prior to this APOD's data. It's the same object but by no means identical. There are
striking differences. Sept. 15th's APOD is also twice as detailed in resolution.
Chris Peterson wrote:The STIS instrument has a fancy sort of "filter wheel" called the mode selection device. It consists of a large number of gratings optimized for specific modes, as well as a prism and a simple mirror. The particular mode selecting element used for an image is identified in the FITS header as the optical element. MIRVIS means the mirror was used- that is, a direct image was made, not a spectroscopic image using one of the gratings.
Thanks for that explanation, Chris. I thought it might be something like that. I have been wondering if it's filtered light or not. I get the impression that it's either unfiltered or minimally filtered. I was trying to explain it to some of the commenters over at the reddit post for the image.
[quote="Rick"][quote="ta152h0"]caramba, I am speechless. The big pooobahs at APOD hit one out of the park. Time for an ice cold one to stop the vibrations[/quote]
[url=http://apod.nasa.gov/apod/ap020106.html]Second one[/url] out of the park, then. Word for word identical, just re-processed picture. (well, not "just", but you see what I mean)[/quote]
The 2002 APOD actually an image which uses data from 1997. That's 5 years prior to this APOD's data. It's the same object but by no means identical. There are [url=http://upload.wikimedia.org/wikipedia/en/d/d9/M2-9motivo_corradi.gif]striking differences[/url]. Sept. 15th's APOD is also twice as detailed in resolution.
[quote="Chris Peterson"]The STIS instrument has a fancy sort of "filter wheel" called the mode selection device. It consists of a large number of gratings optimized for specific modes, as well as a prism and a simple mirror. The particular mode selecting element used for an image is identified in the FITS header as the optical element. MIRVIS means the mirror was used- that is, a direct image was made, not a spectroscopic image using one of the gratings.[/quote]
Thanks for that explanation, Chris. I thought it might be something like that. I have been wondering if it's filtered light or not. I get the impression that it's either unfiltered or minimally filtered. I was trying to explain it to some of the commenters over at the reddit post for the image.