Helene Image Products Options

[machi]

Helene from distance ~7000 km. Date 18.6.2011. Red, green a blue (BL1) filter. Resolution is ~42 m/pix.

EDIT: I uploaded new version of the image without three prominent specks of noise.

Attached thumbnail(s)

 

[Bjorn Jonsson]

As machi's great color composite reveals, Helene's color is pretty bland in visible light. Color differences are somewhat more pronounced if IR3-GRN-UV3 is used as RGB. Here is an enhanced IR3-GRN-UV3 composite; color differences become obvious by greatly increasing the color saturation:



The color of the smooth terrain is clearly different from the color of the 'grooved' terrain (different composition?). The grooved terrain is more yellowish.

It should be noted that the bright colors (especially red and blue) that are visible at several locations near the limb are not real features. Due to Cassini's rapid motion and the time between the GRN image and the other two images I had to warp the images to get a proper color composite and this was especially difficult near the limb. I probably need a high quality shape model of Helene to be able to do this properly (there are many nice stereo pairs of Helene and the shape of Helene's limb could also be used for constructing shape models).