image by Zac Pujic
The fifth photo of the Imbrium lava flow has been taken. The first four were by eastern third of Imbrium. Thus, these orange lozenges are probably older lavas that have been covered by thin layers of young blue flows. In fact, Zac’s image shows the orange stuff is topographically lower and somewhat rougher than the smooth, plateau-like blue flows. Usually older lavas are preserved in slightly elevated hills that weren’t submerged by younger lavas. If the orange stuff really is lower that implies that the blue flows are rather sparse and don’t fully cover the pre-existing terrain. Old, titanium-poor lavas probably underly all of Imbrium
31-cm Newtonian at f/28 + Phillips ToUcam Pro webcam.
Zac comments, I used my monochrome image as the luminosity channel in composite images using either a Clementine ratios image or my own saturated colour image. The Clementine and my saturated colour composites match satisfactorily. The Clementine composite shows the orange regions more comprehensively than my saturated visible light image composite (Panel C). Clearly the 11 filters on Clementine can differentiate a mare compositional difference (blue vs green) which I cannot using saturated visible light.
Rükl plate 10
Yesterday's LPOD: The Longest Rille
Tomorrow's LPOD: The Baby & the Skull