Looks like a camera artefact to me, especially when zoomed in.

Old age creeps in insidiously.....
i mis dislexiaed the curiosity/spirit names so sorry guy.....
But what explains the faint contrail?
You dont think the object and contrail related?

Yeah definitely Spirit hit a bug.
Now it's stuck to the lens.
Wait..what?

Looks like a rocket.

North Korea doing super-secret testing.

will NASA tell us this is just another mars rock?

Great minds think alike..................
Fools seldom differ......
That movie went through my head too.......
What then would BE flying around? wind driven sand?
It looks like theres distance there, but if stuck on the lense is there a way to enhance the artifact through some kind of software which may give us a corrected image on another scale or magnification?
(knowing the lense specs of the camera, and the distance at zero for the srtifact?)
I bet the NRO has sat analysis stuff like that.....
KUDOS for the screenshot

Well it sure look like a chinnese lantern to me

no no it swamp gas or

it a bug that hit the eye len.

Here's a bigger pic..

Where is you Arken?...........................

Is anyone able to enhance the above sceenshot? and post same?
I am running a 100 buck laptop with zilch for guts and a few screwed up keys......(that and fat fingers if you are wondering)......
The likeness is damned close to an earthly aerodynamic shape....
I wonder if the wing /tail sizes (control surfaces)are suitable for Martian atmos? any bored mathmaticians?
Trouble is i think this stuff but no education at that level to figure out the details...
Another observation from tired eyes is the winglike section cresent shaped possibly?
Thanks again for photo.......
On the larger shot it becomes more plausibly a lense bug maybe......?
Looking again it seems to be surrounded by a sort of airglow phenom in the second larger shot....ya gotta squint

It looks to me as though one of the rockets the palestinians are lobbing at Israel went of course.

(sorry it's so lame but all the good jokes were already taken.)

All joking aside it looks like something flying.
Hmmmm... thanks for the pic.