"Egg Rock" is a smooth, shiny nickel-iron meteorite found sitting on the surface of Mars on Curiosity's Sol 1505, or 30-Oct-2016. It is described the next day in Arizona State University's Red Planet Report website: Curiosity: Egg Rock, a small meteorite

Did Curiosity's software flag it as potentially interesting (e.g. "hey, what's that?) or was it noticed/spotted first by researchers, who then directed Curiosity to take a closer look?

See also:

Images from EarthSky, credit NASA/JPL/ASU, captions "October 30, 2016 image via Curiosity rover on Mars" (click for larger size):

"Egg Rock" meteorite on Mars "Egg Rock" meteorite on Mars "Egg Rock" meteorite on Mars


People did!

Re-reading the linked article in ASU's Red Planet Report, I noticed at the end it links to an additional article; "More on Egg Rock here".

That link says:

Laser-zapping of a globular, golf-ball-size object on Mars by NASA’s Curiosity rover confirms that it is an iron-nickel meteorite fallen from the Red Planet’s sky.

Iron-nickel meteorites are a common class of space rocks found on Earth, and previous examples have been seen on Mars, but this one, called “Egg Rock,” is the first on Mars examined with a laser-firing spectrometer. To do so, the rover team used Curiosity’s Chemistry and Camera (ChemCam) instrument.

Scientists of the Mars Science Laboratory (MSL) project, which operates the rover, first noticed the odd-looking rock in images taken by Curiosity’s Mast Camera (Mastcam) at at a site the rover reached by an Oct. 27 drive.

“The dark, smooth and lustrous aspect of this target, and its sort of spherical shape attracted the attention of some MSL scientists when we received the Mastcam images at the new location,” said ChemCam team member Pierre-Yves Meslin, at the Research Institute in Astrophysics and Planetology (IRAP), of France’s National Center for Scientific Research (CNRS) and the University of Toulouse, France.

The iron-nickel meteorite link above points to the same information as well as a further discussion of the meteorite.

below: cropped section of image of "Egg Rock" from here showing the spots where Curiosity's ChemCam laser has ablated material.

enter image description here

  • $\begingroup$ If someone has more detailed information about the discovery, please consider posting another answer. $\endgroup$ – uhoh Jan 29 '18 at 9:44
  • $\begingroup$ Out if interest, how would a Curiosity discovery differ from a people’s discovery? How do you determine the two different discoveries? $\endgroup$ – Edlothiad Jan 29 '18 at 10:56
  • $\begingroup$ @Edlothiad the third sentence of the question explains what I mean by that. Through software upgrades, NASA has been adding more and more automation to Curiosity since it's been there. See for example the answers to How much can the Mars rover Curiosity do autonomously, after four years of operation? $\endgroup$ – uhoh Jan 29 '18 at 15:44
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    $\begingroup$ I totally glanced over that, thanks for pointing it out and the link! $\endgroup$ – Edlothiad Jan 29 '18 at 16:36

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