Argyre Planitia

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Argyre Planitia

(ar -jÿr, air -) A 1000-km diameter basin in Mars' southern hemisphere, visible as a bright area to Earth-based observers and centered on the areographic coordinates 50° S latitude, 44° W longitude (see areography). Like Hellas Planitia it is probably an impact feature. See Mars, surface features.
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On 6 June, the high-resolution stereo camera on ESA's Mars Express revisited the Argyre basin as featured in our October release, but this time aiming at Nereidum Montes, some 380 km northeast of Hooke crater.
Named after George Ellery Hale, this 150-by-125-kilometer-wide (90-by-80-mile) crater resides just north of the Argyre Basin in Mars's southern hemisphere.
The water-vapor content of the tenuous Martian atmosphere is at its highest during northern-hemisphere spring and early summer, when the northern polar cap is receding rapidly, and early in southern-hemisphere spring, when ice in the Hellas and Argyre basins is subliming.