Cassini was deliberately pushed into Saturn's atmosphere and destroyed (so as not to potentially contaminate habitable worlds) so we probably don't need to worry about that.

Also, there's a great documentary TV series called "7 Days Out" on Netflix which covers the last week of the Cassini mission.

I watched that show "7 Days Out" specifically for the Cassini mission. It did not disappoint. There were feelings involved.

Thanks for the hint.

If found in the current state, I'd speculate they'd conclude it's a planetary explorer:

* Lots of sensors

* Lots of communcation equipment

* No external controls

* Parts built without maitenance access

* Solar power

* Found on a mostly empty planet, with only a few other rovers around

* A planet next door littered with similar technology

How would you recognize this and reach that conclusion if you were a different species, with different technology?

Wheels and axis are probably universal. Don't believe in sci-fi moves about floating transports.

A cooper wire around a iron core makes a good electromagnet. Deducing from there that it is a motor is not difficult. (It's even connected to the wheels.)

I'm not sure about the battery. I guess it's guessable because it has some unusual metals.

The lens (a clear piece of glass, thin, with a rounded surfaces) are also probably universal. If you have a few of them in line connected with moving parts with gears will confirm that it's the zoom of the camera.

Probably at the end of the camera is the sensor, I don't know how long it will keep the photo sensibility. It is connected by wires with the big chunk of wires and weird electric parts, so it must be the main board. The main board is also connected to the motors of the wheels.

The high gain antena is not parabolic (IIUC), it would have been an easy task to recognize it if it were parabolic :( . The low gain antena is a stick. By this time they already know the technology level of the motors and they will deduce that the communication is electromagnetic waves. So a big metal stick connected to wires is a good low gain antena candidate. The other weird thing has similar conections. And is orientable (they can see the inner gears of the support arm) and perhaps if you open it the inner structure also help. They will deduce that it is another antena.

[I personally think that for long distance transmission (specially in space) the electromagnetic waves are irremplazable. They may have a better encoding and filtering methods, but I guess they will mainly use electromagnetic waves.]

Possibly, however who knows if in a million of years Earth even still exists to make associations viable.