PIA18526: Halo of Hollows

Halo of Hollows


This high resolution image shows hollows in the northnern hemisphere. Hollows are irregularly shaped, high-albedo depressions that are often associated with craters . These hollows are located along the rim of a degraded small crater in the smooth plains.

This image was acquired as part of the MDIS low-altitude imaging campaign. During MESSENGER's second extended mission, the spacecraft makes a progressively closer approach to Mercury's surface than at any previous point in the mission, enabling the acquisition of high-spatial-resolution data. For spacecraft altitudes below 350 kilometers, NAC images are acquired with pixel scales ranging from 20 meters to as little as 2 meters.

Date acquired: May 26, 2014
Image Mission Elapsed Time (MET): 43453698
Image ID: 6383189
Instrument: Narrow Angle Camera (NAC) of the Mercury Dual Imaging System (MDIS)
Center Latitude: 48.87°
Center Longitude: 134.1° E
Resolution: 5 meters/pixel
Scale: The circle of halos has a diameter of about 1.3 km (0.8 mi.).
Incidence Angle: 51.6°
Emission Angle: 26.4°
Phase Angle: 78.0°

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 Narrow Angle Camera (NAC)
Extra Keywords Crater, Grayscale, Radio
Acquisition Date
Release Date 2014-06-20
Date in Caption 2014-05-26
Image Credit NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington
Source photojournal.jpl.nasa.gov/catalog/PIA18526
Identifier PIA18526