Conjoined Twins
NASA/JPL/University of Arizona
Conjoined Twins
ESP_020894_1395  Science Theme: Landscape Evolution
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This image shows a remarkable double crater with a shared rim and North-South trending ejecta deposits. These two craters must have formed simultaneously.

The bolide may have consisted of two objects of the same mass that were loosely connected, perhaps similar to comet 103P/Hartley 2, which the Deep Impact spacecraft (EPOXI mission) encountered on 4 November 2010 (see here). Many more asteroids than comets impact Mars, but asteroids also come in double shapes, like asteroid Itokawa explored by the Japanese Huyabusa mission. The bolide must have separated into two distinct pieces prior to impact in order for two craters to be recognizable.
Written by: Alfred McEwen   (9 February 2011)

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Acquisition date
10 January 2011

Local Mars time:
15:42

Latitude (centered)
-40.166°

Longitude (East)
247.999°

Range to target site
250.1 km (156.3 miles)

Original image scale range
50.0 cm/pixel (with 2 x 2 binning) so objects ~150 cm across are resolved

Map projected scale
50 cm/pixel and North is up

Map projection
Equirectangular

Emission angle:
1.4°

Phase angle:
56.3°

Solar incidence angle
55°, with the Sun about 35° above the horizon

Solar longitude
214.7°, Northern Autumn

North azimuth:
96°

Sub-solar azimuth:
17.7°
JPEG
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IRB color
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Merged IRB
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Merged RGB
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RGB color
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map-projected   (120MB)

IRB color
map-projected   (56MB)

JP2 EXTRAS
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map-projected  (47MB)
non-map           (81MB)

IRB color
map projected  (14MB)
non-map           (61MB)

Merged IRB
map projected  (111MB)

Merged RGB
map-projected  (107MB)

RGB color
non map           (61MB)
ADDITIONAL INFORMATION
B&W label
Color label
Merged IRB label
Merged RGB label
EDR products
HiView

NB
IRB: infrared-red-blue
RGB: red-green-blue
About color products (PDF)

Black & white is 5 km across; enhanced color about 1 km
For scale, use JPEG/JP2 black & white map-projected images

USAGE POLICY
All of the images produced by HiRISE and accessible on this site are within the public domain: there are no restrictions on their usage by anyone in the public, including news or science organizations. We do ask for a credit line where possible:
NASA/JPL/University of Arizona



Postscript
For information about NASA and agency programs on the Web, visit: http://www.nasa.gov. NASA's Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, Calif., manages the Mars Reconnaissance Orbiter for NASA's Science Mission Directorate, Washington. Lockheed Martin Space Systems is the prime contractor for the project and built the spacecraft. The HiRISE camera was built by Ball Aerospace and Technology Corporation and is operated by the University of Arizona. The image data were processed using the U.S. Geological Survey’s ISIS3 software.