PIA17027: In Focus: Cahokia Vallis

In Focus: Cahokia Vallis


This image shows the second of five broad channels on Mercury for which names were recently approved (see Cahokia Vallis ). The valleys are named according to the theme of "abandoned cities (and towns and settlements) of antiquity" that was developed especially for these landforms.

The vallis shown in this figure is named for Cahokia Mounds, a Native American city that was the largest urban settlement in Mississippian culture (approx. 800-1500 CE). Cahokia contained hundreds of earthen mounds that supported the city's buildings. At its peak, the city may have been home to between 6,000 and 40,000 inhabitants. This image is a portion of the MDIS global mosaic basemap that was acquired during MESSENGER's first year in orbit.

Date Created: March 26, 2013
Instrument: Wide Angle Camera (WAC) of the Mercury Dual Imaging System (MDIS)
Feature Latitude Range: 64.9° N to 66.7° N
Feature Longitude Range: 124.4° E to 128.5° E
Feature Diameter: 77 km
Projection: Azimuthal equidistant

Background Info:

The MESSENGER spacecraft is the first ever to orbit the planet Mercury, and the spacecraft's seven scientific instruments and radio science investigation are unraveling the history and evolution of the Solar System's innermost planet. MESSENGER acquired over 150,000 images and extensive other data sets. MESSENGER is capable of continuing orbital operations until early 2015.

For information regarding the use of images, see the MESSENGER image use policy .

Cataloging Keywords:

Name Value Additional Values
Target Mercury
Target Type Planet
Instrument Host MESSENGER
Host Type Orbiter
Instrument Mercury Dual Imaging System (MDIS)
Detector Wide Angle Camera (WAC)
Extra Keywords Color, Map, Radio
Acquisition Date
Release Date 2013-05-07
Date in Caption 2013-03-26
Image Credit NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington
Source photojournal.jpl.nasa.gov/catalog/PIA17027
Identifier PIA17027