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Approaching Aitken Crater - Vertregt J
01.19.11
 
northern edge of Vertregt J › View larger image
As LRO slewed to obliquely view Aitken crater (17 January Featured Image), the northern edge of Vertregt J was serendipitously captured by the NAC. North to the left, image is about 6 km wide [NASA/GSFC/ASU].


Extreme oblique views are a luxury with the LRO mission, since most instruments (including LROC) need to be pointed nadir (straight down) most of the time. Also, thermal concerns limit when LRO can look off to the side. The LROC targeting team closely monitors when opportunities arise to target extreme slews and acquire spectacular views (Bhabha crater).

WAC mosaic centered on Vertreg J oblique › View larger image
WAC mosaic centered on Vertreg J oblique NAC view. Image width 80 km; A = bottom of Aitken crater, V = Vertregt K, VJ = Vertregt J [NASA/GSFC/Arizona State University].


Sometimes LROC obtains images while the spacecraft is slewing to a steady off-nadir position, which takes about ten minutes, in order to acquire oblique views. When possible the LROC targeting team will squeeze in a short NAC image just as the spacecraft is nearing the slew position - when this type of targeting works we sometimes obtain spectacular views such as today's featured image.

Full NAC oblique view with the double crater Vertregt J › View larger image
Full NAC oblique view with the double crater Vertregt J partially seen in the southeast background (right). Full scene is about 30 km wide, NAC M149411489 [NASA/GSFC/Arizona State University].


The region around Vertregt J (21.46°S, 174.32°E) is typical of the highlands - hilly and rugged. About seventy percent of the Moon is mapped as highlands, yet this most common terrain type is only poorly sampled. Only one Apollo mission explored a true highland target: Apollo 16. As it turns out, results from the Clementine and Lunar Prospector missions showed lunar scientists that the chemistry of Apollo 16 rocks differs significantly from most the highlands. Murphy's law at work! Lunar scientists need samples from other highland targets, especially inside the South Pole Aitken Basin (SPA) basin, to get a better handle on the origin of the lunar crust and the history of asteroid bombardment early in our solar system's history.

› Full-size images
http://wms.lroc.asu.edu/lroc_browse/view/M149411489LR