Lunar Orbiter High Resolution Subframes

There are three high-resolution subframes for each of the medium-resolution frames that are labeled in Figure 9.1. Their locations are shown precisely on the corresponding medium-resolution frames. Features that are mentioned in the notes with each subframe are identified with code letters.

Figure 9.1. The Moscoviense Basin, seen at a low sun elevation angle. The entire main ring (445 km) is prominent. There is most of an inner ring but mare covers its northeast segment. Part of LO5-124M.

Figure 9.2. The Moscoviense Basin, seen from an earlier orbit at a higher sun angle. Part of LO5-103M.

Figure 9.3. This figure labels the principal ground points and approximate total area of coverage of the medium-resolution Lunar Orbiter photos included in this chapter.

Figure 9.1. The Moscoviense Basin, seen at a low sun elevation angle. The entire main ring (445 km) is prominent. There is most of an inner ring but mare covers its northeast segment. Part of LO5-124M.

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Figure 9.2. The Moscoviense Basin, seen from an earlier orbit at a higher sun angle. Part of LO5-103M.

NSM flat floor \ NSM slope

L05-181M

Sun Elevation: 13.32°

Distance: 1374.79 km

The boundary where the flat floor of the proposed Near Side Megabasin meets the exposed slope of the basin is clearly visible near Fabry (184 km) and Compton (162km). The Lomonosov-Fleming Basin obscures this edge below 30° south latitude. The Humboldtianum Basin can be seen in the upper left corner.

Pre-Nectarian

Fabry, 1 84 km

Harkhebi, 237 km Joliot, 164 km Szilard, 122 km

Nectarian

Humboldtianum Basin, 600 km

Early Imbrian

Compton, 162 km Lomonosov, 92 km

Late Imbrian

Cantor, 81 km

Coppernican

Giordano Bruno, 22 km

Bridgman rernadskiy

LomonosoV' Fleming B.

L05-158M and 163M

Sun Elevation: 11°

Distance: 1470 km

This is a mosaic of two medium-resolution frames with a large overlap. There are many chains of secondary craters here, such as Catena Kurchatov from the Humboldtianum Basin (to the northwest) and others from the Mendeleev Basin (to the southeast). The Lomonosove-Fleming Basin can also be seen in the photo on the preceding page.

Pre-Nectarian

Fabry, 1 84 km

Lomonosov-Fleming Basin, 620km

Nectarian

Bridgman, 80km Millikan, 98 km

Seyfert, 1 10 km

Early Imbrian

Compton, 162 km Kidinnu, 56km Nijland, 35 km

Late Imbrian

Cantor, 81 km

Eratosthenian

Innes, 42 km Olcot, 81 km

L05-124M Sun Elevation: 10.16° Distance: 1478.87 km

The Moscoviense Basin and its ejecta blanket dominate this photo Key below 50° north latitude. The inner ring, filled with dark mare, is Pre-Nectarian Early Imbrian Late Imbrian shown dramatically in this low sun angle image. The mare floor is Campbell, 219 km Compton, 162 km Nikolaev, 41 km clearer in the photo on the next page. Stormer, 69 km

Nectarian Von Neumann, 78 km

Bridgman, 80km Moscoviense Basin, 445 km

L05-085M and 103M

Sun Elevation: 11°

Distance: 1515 km

L05-085M and 103M

Sun Elevation: 11°

Distance: 1515 km

This image is a mosaic of two frames, each of which is included in the CD. This photo shows the detail within Mare Moscoviense. The dashed line shows the extreme boundary of that part of the ejecta from the proposed Near Side Megabasin that crossed over the megabasin's anti-node. Ejecta that had more velocity escaped the Moon.

Pre-Nectarian

Campbell, 21 9km

Nectarian

Appleton, 63 km DAIembert, 248 km Freundlich, 85 km Moscoviense Basin, 445 km

Wiener, 120 km

Early Imbrian

Compton, 162 km Hutton, 50 km Nijland, 35km Slipher, 69 km

Late Imbrian

Golovin, 37km Nikolaev, 41 km Nusl, 61 km Von Neumann, 78 km

Eratosthenian

Stearns, 36 km

A FreufidNch-Sharonov B.

180 E/W

L05-079M

Sun Elevation: 10.57°

Distance: 1529.62 km

The bubbles near the terminator are development artifacts. The floor of D'Alembert (248 km) is well shown here, while the floor of Campbell is less clear; even the mare that is so striking in the image on the previous page is not visible here.

Pre-Nectarian

Campbell, 219 km Freundlich-Sharanov Basin, 600 km

Nectarian

Appleton, 63 km D'Alembert, 248 km

Freundlich, 85 km Late Imbrian

Larmor, 97 km

Early Imbrian

Hutton, 50 km Slipher, 69 km

Golovin, 37km

Nusl, 61 km

Von Neumann, 78 km

Sommerfeld

Rowland

ich\f) Schneller

L05-053M

Sun Elevation: 9.18°

Distance: 1449.77 km

This image spans the eastern and western hemispheres of the Moon. A large crater in the lower right corner is about the same size as Sommerfeld and Rowland but remains unnamed.

Pre-Nectarian

Avogadro, 139 km Debye, 142 km

Nectarian

D'Alembert, 248 km Erlicht, 30 km Guillaume, 57km

Larmor, 97 km Rowland, 171 km Sommerfeld, 169km

L05-039M

This area is dominated by the ejecta from the pre-Nectarian Birkhoff Basin (Eastern Far Side Region). The floor of Rowland is clear in this image. The large unnamed crater south of Schneller (mentioned on the previous page) is also clearly shown here. Clementine data has revealed that Jackson has a large ray pattern.

Distance: 1571.18km

Pre-Nectarian

Cockcroft, 93 km Evershed, 66 km Mach, 180 km Montgolfier, 88 km

Sun Elevation: 10.15°

Nectarian Late Imbrian

Rowland, 171 km Woltjer, 46km

Copernican

Jackson, 71 km

This is a region of the internal slope of the Near Side Megaba-sin. It has been covered with ejecta from the South Pole-Aitken Basin and then the Humboldtianum Basin but then the region in this subframe, at least its upper two-thirds, has been relatively free from the influence of other basins. The largest crater in this image is Petrie (P, Eratosthenian, 33 km).

Chains of secondary craters here come from Compton to the north and Fabry to the southwest. The low level of erosion of fine chains from Compton is evidence for assigning Compton's age to the Early Imbrian Period, after the heavy Nectarian bombardment.

\From Humboldtianum

LO5-181H2 Sun Elevation: 13.32° Distance: 1374.79 km

The north-northwest to south-southeast ridges and Sisakyan (S, 34 km). The tip of Catena Sumner is near the troughs running through this area are from the Humbold- bottom edge of this subframe (the catena is continued on tianum Basin. Their patterns have obscured the crater the next page).

Catena Sumner is near the small, fresh crater Sumner (S, Imbrium Basin. Bright rays on the mare floor of Szilard (Sz, 50 km). The origin of Catena Sumner is not clear; it does not 120 km) ) come from Giordano Bruno (Copernican, 22 km), line up well with basins on the far side. It lines up best with the which is out of the subframe to the west (see LO5-181M).

This region near Millikan (M, Nectarian, 98 km) contains the intersection of many influences. The ejecta blanket of the Humboldtianum Basin covers that of the Mosco-viense Basin here (both are of the Nectarian Period as is

Millikan). The younger crater just southwest of Millikan is Millikan R (MR, Early Imbrian, 49 km). H. G. Wells (H, 114 km) seems to have lived through all or many of these Nectarian events.

LO5-158H2 and -163H2

Sun Elevation: ~11°

Distance: ~1515 km

LO5-158H2 and -163H2

Sun Elevation: ~11°

Distance: ~1515 km c

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The largest and oldest crater here is H. G. Wells (H, 114 km). Next in size, and much younger, is Cantor (C, Late Imbrian, 81 km). Kidinnu (K, Early Imbrian, 56 km) is the crater with the strong central peak, as is typical of craters of this size. The evidence for Kidinnu being older than Cantor is that ejecta from Cantor has modified the rim of Kidinnu. Tesla (T, 43 km) has retained a sharp rim, but its ejecta has been cratered nearly as much as that of Cantor, and is probably of the Nectarian Period.

This group of craters exemplifies the broad range of names approved through the nomenclature process of the International Astronomical Union. Wells (1886-1946) was a British science writer who authored "War of the Worlds." Georg Cantor (1845-1918) was born and died in Russia, but his mathematics work on set theory was in Germany. Moritz Cantor (1829-1920), a relative of Georg and a German mathematician, is also honored with this crater. Kidinnu (or Cidenas, died about 343 B.C.) was a Babylonian astronomer. Nikola Tesla (1856-1943) was a Croatian-born Serbian. He became an American inventor who influenced the growth of alternating current.

Ridges and deep troughs on the right side of this mosaic probably originate from the Humboldtianum Basin. In some places, the secondary craters are so close together that they appear as continuous ditches but some isolated craters are within the ditches. The ridges are raised by finer ejecta (note the pitting there), augmented by ejecta from the craters in the troughs.

Hogg (H, 38 km) is the largest distinct crater in this mosaic. Its impact has nearly hit the rim of the older, somewhat larger crater beneath it. This area is relatively free of influences from craters greater than 50 km in radius, and so the smaller craters have retained more sharpness than in other areas. The catenae in the right side of this image radiate from the Mendeleev Basin, although they have fallen on the exposed edge of the ejecta blanket of the Moscoviense Basin.

LO5-124H3

Sun Elevation: ~10°

Ol 1

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