Capuanus, Mercator and Campanus
An image of the area surrounding the craters Capuanus, Mercator and Campanus captured in April 1999 using a CCD video module and 26 mm eyepiece in projection mode. Slight sharpening was applied to this image to enhance some details.
This image of the same area was generated by compositing (overlaying) 5 separate images captured from video. This image averaging technique removes noise in the image that is an artifact of the video process, but it tends to wash out some small details. A slight sharpening was applied to the composite image.
A slight enlargement of the same area with landmarks and scale labeled. One feature on the right side of the image appeared to have a circular shape and appeared to be elevated terrain, suggesting that it might be a lunar dome, possibly an ancient volcano. A further enlargement and enhancement (inset) shows a few dark pixels at the top of the feature, perhaps the result of a small crater as one might expect to see on a volcano.
The size of a small crater or craterlet at the top of the dome-like feature would be near the limit of resolution of the telescope/camera configuration used to capture these images. For this reason the momentary changes in refraction by the Earth's atmosphere greatly affect the clarity of the feature. This sequence of images was selected from the 2 minutes of video that was captured of this area on April 25, 1999. Each image shows the dome-like feature at the center. In several of the images a few dark pixels can be seen at the top of the dome. This is by no means proof of a dome with a craterlet at the top, but it suggestive of the existence of such a feature in this area. If anyone reading this happens to know of some research that has been conducted on lunar domes in this area, we would very much appreciate hearing about it. We can be reached at the e-mail link on the home page.