Aspledon Undae is one of the named northern circumpolardune fields in the vicinity ofPlanum Boreum, theMartian North pole. It is named after one of theclassical albedo features on Mars.[1] Its name was officially approved by theInternational Astronomical Union (IAU) on 20 March 2007. Its name isGreek,[1] and derives from the name of a town inBoeotia,Ancient Greece, which, in turn, took its name from Aspledon (Ancient Greek:Ασπληδών),[2] son ofPoseidon, the ancient Greek god of the sea.[3][4][5] The dunes of Aspledon Undae extend from latitude 71.47°N to 75.14°N and from longitude 305.83°E to 315.04°E (44.96°W – 54.17°W).[1] Its centre is located at latitude 73.06°N, longitude 309.65°E (50.35°W), and has a diameter of 215.2 km.[1]
Aspledon Undae is the southernmost of the albedo-named dune fields of Planum Boreum, and lies to the south ofHyperboreae Undae and southeast ofSiton Undae. It is theorised that the formation of Aspledon Undae may have occurred during early erosion incidents of the Planum Boreum cavi unit, and thatRupes Tenuis may have also been a sand source, although it is now depleted. Other dune fields sharing the same formation history includeOlympia andSiton Undae.[6] Aspledon Undae, along with Hyperboreae, Siton, Olympia, and Alalos Undae is one of the five named northern circumpolar dune fields. However, unlike the other four, it is not one of the densest.[7] The dune field of Aspledon Undae, along with those ofSiton,Hyperboreae, andAbalos Undae,[6] overlays the lowlands ofVastitas Borealis.[8] Aspledon Undae has been imaged byNASA's2001 Mars Odyssey robotic spacecraft using theThermal Emission Imaging System (THEMIS) camera on board the spacecraft.[9]
According to Tanaka et al.,Planum Boreum lies on two major basal units: The Rupes Tenuis unit and the Planum Boreum Cavi unit. The age of the Rupes Tenuis unit is earlyAmazonian, while the Planum Boreum Cavi unit overlays the Rupes Tenuis unit, and its age is Middle to Late Amazonian. The Olympia Undae unit may have formed during early denudation incidents of the Planum Boreum Cavi unit in its immediate neighbourhood.[6] More distant dune fields from the Planum Boreum Cavi unit, such as Siton, Aspledon, and a large portion ofOlympia Undae may have formed during earlier erosional events of the Planum Boreum Cavi unit.[6] Other sources to these dune fields may includeRupes Tenuis, although this source is now considered to be exhausted.[6]
Ασπληδών. Ορχομενού δε υιείς Ασπληδών Κλύμενός τε και Αμφίδοκος θεοειδής, Εustath. ad Ιl. β. p. 272. η Ασπληδών εκλήθη από Ασπληδόνος υιού Ποσειδώνος
12. ή δε Ασπληδών γράφεται παρ' ετέροις και χωρίς του α. εκλήθη δε από Ασπλη, δόνο, ύιου Ποσειδώνοί, ή Πρεβώνο, ή Ορχομε, νού. Ορχομενού γάρ φασιν υισί.
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