NASA Reveals the Far Side of the Moon as Never Before Seen
Because the moon is tidally locked (meaning the same side always faces Earth), it was not until 1959 that the farside was first imaged by the Soviet Luna 3 spacecraft (hence the Russian names for prominent farside features, such as Mare Moscoviense). And what a surprise - unlike the widespread maria on the nearside, basaltic volcanism was restricted to a relatively few, smaller regions on the farside, and the battered highlands crust dominated. A different world from what we saw from Earth.
Of course, the cause of the farside/nearside asymmetry is an interesting scientific question. Past studies have shown that the crust on the farside is thicker, likely making it more difficult for magmas to erupt on the surface, limiting the amount of farside mare basalts. Why is the farside crust thicker? That is still up for debate.
The Clementine mission obtained beautiful mosaics with the sun high in the sky (low phase angles), but did not have the opportunity to observe the farside at sun angles favorable for seeing surface topography. This WAC mosaic provides the most complete look at the morphology of the farside to date, and will provide a valuable resource for the scientific community. And it's simply a spectacular sight!
The Lunar Reconnaissance Orbiter Camera (LROC) Wide Angle Camera (WAC) is a push-frame camera that captures seven color bands (321, 360, 415, 566, 604, 643, and 689 nm) with a 57-km swath (105-km swath in monochrome mode) from a 50 km orbit. One of the primary objectives of LROC is to provide a global 100 m/pixel monochrome (643 nm) base map with incidence angles between 55 degrees and 70 degrees at the equator, lighting that is favorable for morphological interpretations. Each month, the WAC provides nearly complete coverage of the Moon under unique lighting.
As an added bonus, the orbit-to-orbit image overlap provides stereo coverage. Reducing all these stereo images into a global topographic map is a big job, and is being led by LROC Team Members from the German Aerospace Center (Deutsches Zentrum für Luft- und Raumfahrt; DLR).
Several preliminary WAC topographic products have appeared in LROC featured images over the past year (Orientale basin, Sinus Iridum). The WAC topographic dataset will be completed and released later this year.
The global mosaic just released by NASA is comprised of over 15,000 WAC images acquired between November 2009 and February 2011.
As part of the March 2011 release, the LROC team posted the global map in ten regional tiles. Eight of the tiles are equirectangular projections that encompass 60 degrees latitude by 90 degrees longitude. In addition, two polar stereographic projections are available for each pole from plus/minus 60 degrees to the pole. These reduced data records (RDR) products are also available for download.
As the mission progresses, and our knowledge of the lunar photometric function increases, improved and new mosaics will be released. Work your way around the moon with the six orthographic projections constructed from WAC mosaics that are available through the NASA link below.
For more information:
http://www.nasa.gov/mission_pages/LRO/news/lro-farside.html
http://www.astromart.com/news/news.asp?news_id=967
http://www.astromart.com/news/news.asp?news_id=958
AstroMart News Archive:
http://www.astromart.com/news/search.asp?search=.+
Of course, the cause of the farside/nearside asymmetry is an interesting scientific question. Past studies have shown that the crust on the farside is thicker, likely making it more difficult for magmas to erupt on the surface, limiting the amount of farside mare basalts. Why is the farside crust thicker? That is still up for debate.
The Clementine mission obtained beautiful mosaics with the sun high in the sky (low phase angles), but did not have the opportunity to observe the farside at sun angles favorable for seeing surface topography. This WAC mosaic provides the most complete look at the morphology of the farside to date, and will provide a valuable resource for the scientific community. And it's simply a spectacular sight!
The Lunar Reconnaissance Orbiter Camera (LROC) Wide Angle Camera (WAC) is a push-frame camera that captures seven color bands (321, 360, 415, 566, 604, 643, and 689 nm) with a 57-km swath (105-km swath in monochrome mode) from a 50 km orbit. One of the primary objectives of LROC is to provide a global 100 m/pixel monochrome (643 nm) base map with incidence angles between 55 degrees and 70 degrees at the equator, lighting that is favorable for morphological interpretations. Each month, the WAC provides nearly complete coverage of the Moon under unique lighting.
As an added bonus, the orbit-to-orbit image overlap provides stereo coverage. Reducing all these stereo images into a global topographic map is a big job, and is being led by LROC Team Members from the German Aerospace Center (Deutsches Zentrum für Luft- und Raumfahrt; DLR).
Several preliminary WAC topographic products have appeared in LROC featured images over the past year (Orientale basin, Sinus Iridum). The WAC topographic dataset will be completed and released later this year.
The global mosaic just released by NASA is comprised of over 15,000 WAC images acquired between November 2009 and February 2011.
As part of the March 2011 release, the LROC team posted the global map in ten regional tiles. Eight of the tiles are equirectangular projections that encompass 60 degrees latitude by 90 degrees longitude. In addition, two polar stereographic projections are available for each pole from plus/minus 60 degrees to the pole. These reduced data records (RDR) products are also available for download.
As the mission progresses, and our knowledge of the lunar photometric function increases, improved and new mosaics will be released. Work your way around the moon with the six orthographic projections constructed from WAC mosaics that are available through the NASA link below.
For more information:
http://www.nasa.gov/mission_pages/LRO/news/lro-farside.html
http://www.astromart.com/news/news.asp?news_id=967
http://www.astromart.com/news/news.asp?news_id=958
AstroMart News Archive:
http://www.astromart.com/news/search.asp?search=.+
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