Where to find the Blair Cuspids

Part of the Rukl Chart

Updated: Jan 2010:

One of the first things we accomplished in the research by The Lunascan Project was the re-discovering of the location of the Blair Cuspids. And although a search for other images was also successful (VGL located another NASA frame), an EBTI (Earth-Based Telescopic Imaging) search has not turned up anything. One of the problems might lie in not knowing exactly where to look, but it is doubtful that any EBTI would be anywhere close to the resolution needed. However, new imaging, especially by future lunar space probes might yield something, so this web page is for those wanting to know exactly where to look.

Represented  here  is the SE quadrant of Rukl Section chart 34. The Blair Cuspids are located a little east of and near Aeriadaeus B, which is immediately above the crater Cayley. For reference, Cayley is 14.3 km wide and 3130 meters deep. North is up.

For some high-res orbiter views of the area, see Lunar Orbiter image LO4-90H1. Aeriadaeus B is the crater near the center of the image, just SE of the conspicuous white triangular blotch or image flaw:

Click here for Lunar Orbiter LO4-90-H1 (Then click on left image for larger version)

Footprint of LO II

The best images, and the ones revealing the Cuspids, are from Lunar Orbiter II. This footprint graphic of Lunar Orbiter II ("M" or medium res) shows the area north of Cayley and the crater Aeriadaeus B.

Below is the "H" or high res image of Aeriadaeus B.  

Lunar Orbiter II frame (LO2-62H3) supplied by VGL

Of the 6-1/2 framelets above, the Cuspids are in the bottom half of framelet number 4, in the dark area. The features stand out as bright points of light against a dark sloping lunar surface.  

Here is a better version of LO2-62H3 showing Ariadaeus B to the left of the Cuspids, the one-kilometer crater, and the Cuspids mid frame and towards the bottom half a few hundred meters to the right. Note the shadow in Aeriadaeus B. The shadows cast by the Cuspids are also evident in LO2-62H3. (Mike Lomax, January 2010)


Francis Ridge
The Lunascan Project

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