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  • MIA011: Disc-Shaped Feature


MIA011.1 Disc Shaped Feature -  Comparison with 'map' and 'non-map' projected images - MGS 2000

​Image credit: NASA/JPL/MSSS

Image sources: Original MSSS source links no longer work (images shown above). However, a PDS image source was found for the Non-map version (see last link below)

Non-map projected

Map projected:

PDS image source non-map projected:

MIA011.2 Disc Shaped Feature - Comparison of MRO Context Camera (CTX) image with MOC images

​​Image credit (1): NASA/JPL/MSSS

Image pixel width: 6.32 m

Image source: (MRO Context CTX)

(When viewing the full MRO CTX image, zoom in, and you will find this object at the very top right of the picture)

MIA011: Disc-Shaped Feature



Mars Report Ref: MIA011

Report Date: July-August 2017

Research Status: Explained

Description: Disc-Shaped Feature
Approximate size: 150 m

Mission image/date: MGS August 2000

Image pixel width: 2.90 m
Location: Aram Chaos

Found by: Bret Colin Sheppard

Image credits: NASA/JPL/MSSS

Graphics/image editing: M. J. Craig

Image source: See image captions


The non-map projected image taken by MOC/MGS, gives the impression of a metal disc shape reflecting sunlight. However, as the image was taken from directly overhead, the perceived viewing angle of this object is an illusion.

The map-projected image gives a clearer impression of the true shape of this feature that is partially covered by sand dunes. The specular reflections on the 'disc' also follow a line which runs parallel with ridges of rock strata.

Due to MSSS recently handing their image database over to NASA/PDS, we have not yet been able to locate the original image links for the map and non-map versions which we show below in MIA011.1 and MR011.2.


None. Feature satisfactorily explained by geology.


ACCEPTED - Illusion caused by incorrect image perspective.

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