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Chaplygin Crater - Lunar Far Side

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Chaplygin Crater - Lunar Far Side

Post  Admin on Mon Feb 28, 2011 3:43 am

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Re: Chaplygin Crater - Lunar Far Side

Post  Admin on Mon Feb 28, 2011 4:00 am

Chaplygin crater located at 150.2E-5.8S is such a region. It is a primary impact crater 127 km. in diameter having a 5 km.depth. The rim height is 1.75 km. and floor diameter is 85 km. Chaplygin was T/O (Target of Opportunity) #29 for Apollo, and was photographed by all but one of the Apollo missions. According to the traditional model and the Geologic Map of the Central Far Side (USGS Map I-1047), it’s interior consists of smooth light plains that can be related to various Imbrian and/or Nectarian basins.




There is a wealth of photographic information available for this particular crater and we ordered a good sampling of both 4X5" and 8X10" negatives from the selection available from NSSDC, Greenbelt, MD. Prints and sectionals were then made from them. From them we see that the region has features that we believe cannot be explained through traditional lunar stratigraphy. By looking at the sectionals made from the AS10-29-4180 negative, we think we know the reason why NASA had a reason for photographing Chaplygin so extensively during subsequent missions. We believe their reason went beyond pure scientific or geologic interest.



Repeated Geometry at Chaplygin

On the northeast rim of Chaplygin there is a conspicuous brightly rayed 1.5 km. crater that, when closely observed, clearly shows the effects of ejecta thrown out onto rugged highlands. It is perched on top of a high bluff that slopes down to the foreground and is easily seen on the 8X10 print above. The ray pattern atop the bluff looks like a splash, but it cascades down the steeper slope resembling a waterfall. These lobes may be avalanches that occurred by ejecta sent down the slope. Looking carefully through these sloping ray patterns on the flank and down onto the terrain below, one can clearly see architectural arrangement.

Every area on AS10-4180 has been scrutinized and many sectionals were made from the original negative. On this "discovery" photo, we see some remarkable repetitious geometric configuration in the middle and foreground that does not reflect typical geologic "treebark" pattern seen on crater flanks. Strangely, when we received the original negative, we saw that the right side of 4180 was not as focused as the left side. Nevertheless, there were enough visible anomalous signals there for us to both conclude and confirm that anomalies seen on the far side are indeed similar in shape to many seen on the near side. When the bright-crater is seen obliquely with lower or medium sun angle such as on AS10-4180 as well as on hazy AS10-32-4794, there is enough resolution on close up prints to see similar geometric structure in identical locations.

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Re: Chaplygin Crater - Lunar Far Side

Post  Admin on Tue Mar 01, 2011 4:22 am

Chaplygin is a large lunar impact crater that lies on the far side of the Moon. It is located to the southeast of the huge walled plain Mendeleev, about mid-way between the craters Schliemann to the northeast and Marconi to the southwest. It is about the same size as Albategnius on the near side.

The rim of this crater is roughly circular, but with an uneven edge. The inner wall is terraced around much of the circumference, but this structure is somewhat disrupted along the southern side. The rim is only mildly eroded, with few craters around the edge — the exception being Chaplygin K which is intruding into the inner wall along the southeast side. Within the walls is an interior plain that is level and smooth in comparison to the rugged terrain that surrounds the exterior of the crater. There is a central peak near the mid-point, and a few tiny craters lie scattered across the surface.

Satellite craters

By convention these features are identified on lunar maps by placing the letter on the side of the crater mid-point that is closest to Chaplygin.
Chaplygin Latitude Longitude Diameter
K 7.7° S 151.2° E 19 km
Q 7.7° S 147.8° E 12 km
Y 2.8° S 149.7° E 29 km


http://en.wikipedia.org/wiki/Chaplygin_%28crater%29








Chaplygin (crater) Location

http://toolserver.org/~geohack/geohack.php?pagename=Chaplygin_%28crater%29¶ms=6.2_S_150.3_E_globe:Moon_type:landmark
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