Starship Asterisk*

[quote="Chris Peterson" post_id=324545 time=1658669819 user_id=117706]
[quote=De58te post_id=324544 time=1658669162 user_id=141631]
[quote=VictorBorun post_id=324540 time=1658662854 user_id=145500]
I tried and failed to google the colour coding :(
[/quote]

There's a description in the infrared link in the APOD explanation. But even that is confusing because they show two examples of the dog in infrared. The first one we are mostly familiar with from Flir cameras. The hottest light is the bright yellow of the dog's eyes and tongue. The coldest is dark purple. However in the second one the hottest is red, while yellow seems to be cooler. The second one also has a bright blue color which is absent in the first. Apparently blue is a colder region than red or yellow, but it is still warmer than dark purple.
[/quote]

The furthest into the IR that the Cassini camera could see was 1 um. That's not thermal IR, just deep red, really. We're seeing reflected IR, not emitted IR.
[/quote]

Thanks, I always though it could see into the thermal. Stunning image nonetheless.

Eric

Logical explanation for the hexagonal formation at Saturn's north pole--it's a giant snowflake.

If it were not for the fabulous rings, Saturn would be just another Uranus or Neptune. But those rings ARE fabulous!

[quote=De58te post_id=324544 time=1658669162 user_id=141631]
[quote=VictorBorun post_id=324540 time=1658662854 user_id=145500]
I tried and failed to google the colour coding :(
[/quote]

There's a description in the infrared link in the APOD explanation. But even that is confusing because they show two examples of the dog in infrared. The first one we are mostly familiar with from Flir cameras. The hottest light is the bright yellow of the dog's eyes and tongue. The coldest is dark purple. However in the second one the hottest is red, while yellow seems to be cooler. The second one also has a bright blue color which is absent in the first. Apparently blue is a colder region than red or yellow, but it is still warmer than dark purple.
[/quote]

The furthest into the IR that the Cassini camera could see was 1 um. That's not thermal IR, just deep red, really. We're seeing reflected IR, not emitted IR.

[quote=VictorBorun post_id=324540 time=1658662854 user_id=145500]
I tried and failed to google the colour coding :(
[/quote]

There's a description in the infrared link in the APOD explanation. But even that is confusing because they show two examples of the dog in infrared. The first one we are mostly familiar with from Flir cameras. The hottest light is the bright yellow of the dog's eyes and tongue. The coldest is dark purple. However in the second one the hottest is red, while yellow seems to be cooler. The second one also has a bright blue color which is absent in the first. Apparently blue is a colder region than red or yellow, but it is still warmer than dark purple.

I got to playing with the Cassini probe! Hoping I could transfer it to my post! :evil:
https://solarsystem.nasa.gov/missions/cassini/the-journey/the-spacecraft/
[attachment=0]dog-with-glasses.jpg[/attachment]
Doggie busy researching! 8-)

I tried and failed to google the colour coding :(

[url=https://apod.nasa.gov/apod/ap220724.html] [img]https://apod.nasa.gov/apod/calendar/S_220724.jpg[/img] [size=150]Saturn in Infrared from Cassini[/size][/url]

[b] Explanation: [/b] Many details of Saturn appear clearly in infrared light. Bands of clouds show great structure, including long [url=https://apod.nasa.gov/apod/ap190915.html]stretching storms[/url]. Also quite striking in [url=https://science.nasa.gov/ems/07_infraredwaves]infrared[/url] is the unusual [url=https://apod.nasa.gov/apod/ap130220.html]hexagonal cloud pattern[/url] surrounding [url=https://solarsystem.nasa.gov/planets/saturn/overview/]Saturn[/url]'s North Pole. Each side of the dark [url=https://www.mathsisfun.com/geometry/hexagon.html]hexagon[/url] spans roughly the width of our Earth. [url=https://en.wikipedia.org/wiki/Saturn%27s_hexagon]The hexagon[/url]'s existence was not predicted, and its origin and likely stability remains a [url=http://laplazagigi.com/wp-content/uploads/2012/06/dog-with-glasses.jpg]topic of research[/url]. Saturn's famous [url=https://spaceplace.nasa.gov/saturn-rings/en/]rings[/url] circle the planet and [url=https://apod.nasa.gov/apod/ap120703.html]cast shadows[/url] below the [url=https://www.nasa.gov/sites/default/files/styles/side_image/public/thumbnails/image/equator_.png?itok=fpt9ejEa]equator[/url]. The featured image was taken by the robotic [url=https://solarsystem.nasa.gov/missions/cassini/the-journey/the-spacecraft/]Cassini spacecraft[/url] in 2014 in several infrared colors. In 2017 September, the [url=https://apod.nasa.gov/apod/ap110613.html]Cassini mission[/url] was brought to a dramatic conclusion when the spacecraft was [url=https://apod.nasa.gov/apod/ap170125.html]directed to dive[/url] into ringed giant.


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