Summary: Ligeia Mare is the second largest body of liquid on Titan and is 50 percent larger than Lake Superior, Earth's largest-sized freshwater lake.
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| Ligeia Mare's size is 50 percent larger than that of Lake Superior, the largest of North America's five Great Lakes and Earth's largest freshwater body by surface area; image of Ligeia Mare obtained via near-polar flyby of Feb. 22, 2007; image of Lake Superior via NASA Goddard Space Flight Center's (GSFC) Sea-Viewing Wide Field-of-View Sensor (SeaWiFS) project; image addition date 2007-03-13: image credit NASA/JPL-Caltech/GSFC, no known copyright restrictions, via NASA JPL Photojournal |
Ligeia Mare is the second largest body of liquid on Titan, with a surface area that is 50 percent larger than that of Lake Superior, Earth's largest freshwater lake by surface area.
Ligeia Mare (Latin: "sea") is centered at 79.7 degrees north latitude, 247.9 degrees west longitude, according to the International Astronomical Union's (IAU) Gazetteer of Planetary Nomenclature. It obtains northernmost and southernmost latitudes of 82 degrees north and 74 degrees north, respectively. Its easternmost and westernmost longitudes occur at 222 degrees west and 276.7 degrees west, respectively. Ligeia Mare's diameter measures 500 kilometers.
Ligeia Mare's longitudinal boundaries place it mostly on Titan's anti-Saturn side. Approximately half a dozen degrees of its westernmost longitudes wrap around Titan's trailing limb for occupancy on the Saturnian moon's Saturn-facing side. Titan's equal-lengthed orbital and rotational periods explain its same-sided orientation with respect to its parent body.
Its southernmost and northernmost extents keep Ligeia Mare within north polar latitudes. Its northernmost reach, at 82 degrees north, extends to eight degrees south of Titan's north pole.
As a high polar latitude occupant, Ginaz Labyrinthus intervenes between northwestern Ligeia Mare and the north pole. Labyrinthus (plural: labyrinthi; Latin borrowing from Ancient Greek λᾰβῠ́ρῐνθος, labúrinthos, “maze”) designates a "Complex of intersecting valleys or ridges," according to the Gazetteer of Planetary Nomenclature's documentation page, Descriptor Terms (Feature Types).
Ginaz Labyrinthus is centered at 83 degrees north latitude, 261.7 degrees west longitude. It marks its northernmost and southernmost latitudes at 84.9 degrees north and 81.7 degrees north, respectively. It posts easternmost and westernmost longitudes of 249 degrees west and 280.2 degrees west, respectively. Ginaz Labyrinthus has a length of 160 kilometers.
Ginaz Labyrinthus trends northwest-southeast. Its southern edge associates with Ligeia Mare. Its northern terminus verges toward Punga Mare, the third of Titan's three maria (Latin: plural, "seas").
All three of Titan's maria are located in the north polar region. Ligeia Mare lies to the east-northeast of Kraken Mare and to the east-southeast of Punga Mare. Their placements with respect to the north pole are described as "just below and to the right" for Kraken Mare, "to the left and above" for "nearly heart-shaped Ligeia Mare and "just below" for Punga Mare, according to NASA Jet Propulsion Laboratory's (JPL) Photojournal post, "Titan's North," published Dec. 12, 2013.
Kraken Mare is centered at 68 degrees north latitude, 310 degrees west longitude. Its northernmost and southernmost latitudes reach 81 degrees north and 55 degrees north, respectively. Its easternmost and westernmost longitudes touch 274 degrees west and 335 degrees west, respectively. Kraken Mare's diameter spans 1,170 kilometers.
Punga Mare is centered at 85.1 degrees north latitude, 339.7 degrees west longitude. It records northernmost and southernmost latitudes of 89 degrees north and 82.2 degrees north, respectively. It registers easternmost and westernmost longitudes of 72 degrees west and 287 degrees west, respectively. Punga Mare has a diameter of 380 kilometers.
A size ranking of Titan's three maria finds Ligeia Mare, with its 500 kilometer-diameter, as the second largest body of liquid on Titan. Kraken Mare's diameter of 1,170 kilometers secures its placement as the largest of Titan's three maria. Punga Mare finishes in third place, with its 380 kilometer-diameter, as Titan's smallest sea.
Ligeia Mare's surface area of approximately 50,000 square miles (130,000 square kilometers) exceeds that of Earth's Lake Superior by 50 percent, according to Photojournal's March 2, 2016, post, "Mystery Feature Evolves in Titan's Ligeia Mare." Lake Superior qualifies as Earth's largest freshwater body by surface area. The largest and northernmost of North America's five Great Lakes has a surface area of 31,700 square miles (82,097 square kilometers), according to "About Our Great Lakes: Lake by Lake Profiles," posted by the NOAA (National Oceanic and Atmospheric Administration) Great Lakes Environmental Research Laboratory (GLERL) website.
The saline Caspian Sea qualifies as Earth's largest inland body of water in a ranking that considers both saline and freshwater bodies. Kraken Mare's immensity of about 150,000 square miles (400,000 square kilometers) exceeds the Caspian Sea's coverage of approximately 143,200 square miles (371,000 square kilometers).
Ligeia Mare's size also is compared with two other Great Lakes. Its surface area approximates the combined sizes of Earth's Lake Huron and Lake Michigan, according to Preston Dyches and Jia-Rui C. Cook's news feature, "Cassini Explores a Methane Sea on Titan," published April 26, 2016, on the NASA JPL website. Lake Huron, the second largest Great Lake and Earth's third largest freshwater body, 23,000 square miles (59,565 square kilometers). Lake Michigan, the third largest Great Lake and Earth's four largest freshwater body, covers 22,300 square miles (57,753 square kilometers).
The International Astronomical Union (IAU) approved Ligeia as the sea's official name on April 11, 2008. The Gazetteer of Planetary Nomenclature explains the name's origin as: "One of the sirens in Greek mythology." Literary or mythic sea monsters inspire the names of Titan's maria, according to the Gazetteer's page on "Categories (Themes) for Naming Features on Planets and Satellites."
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| False-color mosaic of synthetic aperture radar images obtained by the Cassini spacecraft between February 2006 and April 2007 shows Ligeia Mare as nearly heart-shaped body of liquid in Titan's north polar region; image addition date 2013-05-22: image credit NASA/JPL-Caltech/ASI/Cornell, no known copyright restrictions, via NASA JPL Photojournal |
Acknowledgment
My special thanks to talented artists and photographers/concerned organizations who make their fine images available on the internet.
Image credits:
Image credits:
Ligeia Mare's size is 50 percent larger than that of Lake Superior, the largest of North America's five Great Lakes and Earth's largest freshwater body by surface area; image of Ligeia Mare obtained via near-polar flyby of Feb. 22, 2007; image of Lake Superior via NASA Goddard Space Flight Center's (GSFC) Sea-Viewing Wide Field-of-View Sensor (SeaWiFS) project; image addition date 2007-03-13: image credit NASA/JPL-Caltech/GSFC, no known copyright restrictions, via NASA JPL Photojournal @ https://photojournal.jpl.nasa.gov/catalog/PIA09184
False-color mosaic of synthetic aperture radar images obtained by the Cassini spacecraft between February 2006 and April 2007 shows Ligeia Mare as nearly heart-shaped body of liquid in Titan's north polar region; image addition date 2013-05-22: image credit NASA/JPL-Caltech/ASI/Cornell, no known copyright restrictions, via NASA JPL Photojournal @ https://photojournal.jpl.nasa.gov/catalog/PIA17031
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