by Ann » Tue Oct 21, 2014 11:55 pm
Nitpicker wrote:geckzilla wrote:For some reason, only one of Saturn's hemispheres has blue skies. It's also very easy to end up with weird fringes when objects are moving around between exposures. That picture of the thin rings in front of Saturn's limb would have used the rings as the registration point rather than the background Saturn. Maybe it's really like that but there's a good chance that the misalignment between channels is emphasizing it, too.
I found the original image release for that picture.
http://saturn.jpl.nasa.gov/photos/image ... ageId=3444
I was just looking for other examples upon which Supportstorm (the final digital processor of the APOD) might have based the colourisation. I was expecting to find more examples of a blue limb on an otherwise golden Saturn and was surprised to find only one. (And apologies for originally providing questionable links in need of replacement, geck -- my Greek extends no further than knowledge of the alphabet.)
I have never seen a blue limb on Saturn. (And as some people know, I look for blue details quite carefully.)
Titan, on the other hand, really has a blue limb. This blue limb isn't visible in all pictures of Titan, but it is really there.
Here is one good picture of it.
On the other hand, as I searched for information about the nature about this blue limb, I came across
this site. It says that the blue limb on Titan is a layer of haze, and that its true color is ultraviolet, not actually blue.
Ann
[quote="Nitpicker"][quote="geckzilla"]For some reason, only one of Saturn's hemispheres has blue skies. It's also very easy to end up with weird fringes when objects are moving around between exposures. That picture of the thin rings in front of Saturn's limb would have used the rings as the registration point rather than the background Saturn. Maybe it's really like that but there's a good chance that the misalignment between channels is emphasizing it, too.
I found the original image release for that picture.
http://saturn.jpl.nasa.gov/photos/imagedetails/index.cfm?imageId=3444[/quote]
I was just looking for other examples upon which Supportstorm (the final digital processor of the APOD) might have based the colourisation. I was expecting to find more examples of a blue limb on an otherwise golden Saturn and was surprised to find only one. (And apologies for originally providing questionable links in need of replacement, geck -- my Greek extends no further than knowledge of the alphabet.)[/quote]
I have never seen a blue limb on Saturn. (And as some people know, I look for blue details quite carefully.)
Titan, on the other hand, really has a blue limb. This blue limb isn't visible in all pictures of Titan, but it is really there. [url=http://solarsystem.nasa.gov/images/Titan_Inset.jpg]Here is one good picture of it.[/url]
On the other hand, as I searched for information about the nature about this blue limb, I came across [url=https://solarsystem.nasa.gov/rps/multimediaimagedetails.cfm?Subsite_IM_ID=7878&SiteID=5]this site[/url]. It says that the blue limb on Titan is a layer of haze, and that its true color is ultraviolet, not actually blue.
Ann