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File:AS16-M-2478.png

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English: This photo is used in Figure 30-7 of the Apollo 16 Preliminary Science Report (NASA SP-315), which has the following caption:
Unrectified, oblique photograph of Alphonsus Crater (Apollo 16 metric camera frame 2478).

This is shown as Figure 211 from Apollo Over the Moon (NASA SP-362, 1978), which has the following caption:

This oblique metric photo shows part of the lunar highlands where the ancient crust is saturated with large craters. Portrayed here are the crater Alphonsus (middle ground) and the ancient crater Ptolemaeus (foreground). The floor of Alphonsus is broken by faults that form a polygon roughly parallel to the walls. Dark halo craters lie along these faults. The rims of the dark halo craters fill in the fault troughs. This relationship indicates that the craters must have been formed by material ejected from the central vents rather than by collapse of material into the cracks. However, unlike impact craters with their hummocky ejecta and lines of secondary craters, the smooth rimmed deposits have been interpreted as finegrained volcanic ejecta.
Lunar transient events have been observed many times in the crater Alphonsus. Red glows have been documented and spectra have been recorded by Kozyrev (1971) that apparently confirm the existence of gaseous emissions. These events are thought to be related to orbital parameters; when gravitational stresses are high, the crust shifts and gas escapes from the interior at regular intervals. If this is true, a low level of activity still continues to affect the lunar crust and interior.
General and detailed contour maps have been made (Wu et al., 1972) of Alphonsus using metric and panoramic photography obtained by Apollo 16. (See figs. 212 to 215. Fig. 212 is outlined in this figure, and fig. 213 is outlined in fig. 212.)-H.M.

Photographic data:

Image Name: AS16-M-2478
Mission: Apollo 16
Revolution (Orbit): 48
Camera: Mapping/Metric
Exposure: 00:00:00
Camera Tilt: 40
Scan Pixel Scale: 7.933
Start Time: (DOY:114) 1972-04-23T17:38:37
Spacecraft Altitude: 119.27 km
Center Coordinates (lat, lon): -12.48°,-3.05°
Corner Coordinates: -5.75°,-6.13°
-6.31°,0.05°
-12.43°,-0.31°
-12.03°,-6.7°
Sun Elevation: 28.0°
Features: ALPHONSUS, PTOLEMAEUS
Film Type: 3400
Color: black&white
Date
Source Arizona State University, Apollo Image Archive, Apollo Browse Gallery, Apollo 16: Mapping (Metric) Camera, AS16-M-2478
Author NASA
This image or video was catalogued by one of the centers of the United States National Aeronautics and Space Administration (NASA) under Photo ID: AS16-M-2478.

This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing.
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Public domain This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
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