Saturday, March 12, 2011

Farside & LROC WAC views all the way around!

Updated 0158 UT 16 March 2011
From LROC Wide Angle Camera Collection -
The lunar farside as never seen before. LROC Wide Angle Camera orthographic projection, centered at 0°N, 180°E. The Lunar Reconnaissance Orbiter Camera (LROC) team has now released a complete compliment of 100 meter resolution, contiguous illumination mosaics from a perspective over the Moon's equator. The full-sized (1600 x 1600) image is available HERE [NASA/GSFC/Arizona State University].

Mark Robinson
Principal Investigator
Lunar Reconnaissance Orbiter Camera
Arizona State University

Because the Moon is tidally locked, 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 see 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, and in fact several presentations at this week's Lunar and Planetary Science Conference attempt to answer this question.

The Clementine (1994) 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°-70° 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).

For a sneak preview of the WAC global Digital Elevation Model (DEM) with the WAC global mosaic, view a rotating composite Moon (Full Resolution), HERE. The WAC topographic dataset will be completed and released later this year.

The global mosaic released today is comprised of over 15,000 WAC images acquired between November 2009 and February 2011. The non-polar images were map projected onto the GLD100 shape model (WAC derived 100 m/pixel Digital Terrain Model - DTM), while polar images were map-projected on the LOLA shape model. In addition, the LOLA derived crossover corrected ephemeris, and an improved camera pointing, provide accurate positioning (better than 100 m) of each WAC image.

As part of (their) March 2011 release to the Planetary Data System (PDS), the LROC team posted the global map in ten regional tiles. Eight of the tiles are equirectangular projections that encompass 60° latitude by 90° longitude. In addition, two polar stereographic projections are available for each pole from ±60° to the pole. These reduced data records (RDR) products will be available for download on March 15, 2011.

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 these six orthographic projections constructed from WAC mosaics. (The nearside view linked below is different from that released February 21.)

Six orthographic views of the Moon created from the new Lunar Reconnaissance Orbiter Camera WAC global mosaic; upper left to lower right the central longitude is 0°, 60°, 120°, 180°, 240°, 300° East longitude. View the full preview image above HERE [NASA/GSFC/ Arizona State University].

WAC mosaic orthographic view centered at 0° longitude
WAC mosaic orthographic view centered at 60° longitude
WAC mosaic orthographic view centered at 120° longitude
WAC mosaic orthographic view centered at 180° longitude
WAC mosaic orthographic view centered at 240° longitude
WAC mosaic orthographic view centered at 300° longitude

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