Thousands of Spiders on Mars
NASA/JPL/University of Arizona
Thousands of Spiders on Mars
ESP_056231_1065  Science Theme: Seasonal Processes
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As part of the Planet Four citizen science effort, volunteers searched Context Camera images for possible new locations on Mars with “spiders,” or features with radial troughs from which fans emanate in the springtime.

We planned this HiRISE image over one such location, to verify that they are spiders. There are thousands of them in this image!

Written by: Alfred McEwen  (19 September 2018)
Acquisition date
26 July 2018

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
248.7 km (154.6 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

Map projection

Emission angle

Phase angle

Solar incidence angle
67°, with the Sun about 23° above the horizon

Solar longitude
218.1°, Northern Autumn

For non-map projected images
North azimuth:  101°
Sub-solar azimuth:  34.8°
Black and white
map projected  non-map

IRB color
map projected  non-map

Merged IRB
map projected

Merged RGB
map projected

RGB color
non-map projected

Black and white
map-projected   (801MB)

IRB color
map-projected   (406MB)

Black and white
map-projected  (543MB)
non-map           (547MB)

IRB color
map projected  (285MB)
non-map           (518MB)

Merged IRB
map projected  (882MB)

Merged RGB
map-projected  (799MB)

RGB color
non map           (468MB)
B&W label
Color label
Merged IRB label
Merged RGB label
EDR products

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

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

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. The HiRISE camera was built by Ball Aerospace and Technology Corporation and is operated by the University of Arizona.