Chris
Favorite Answer
On a purely theoretical level, ANYTHING moving towards you is blue-shifted. If you're driving on a two land road, the traffic coming the other way (towards you) should be blue-shifted.
However, at anything less than near relativistic speeds (the expansion of the universe), this is such a itty bitty insignificant amount (talking like a trillion trillion trillionth of a nanometer here) as to be virtually impossible to see.
So yea, an asteroid headed towards the earth would fall into that same immeasurable amount as a car, but on the pure theory level, yes, it IS blueshifted.
George Patton
Everything that emits, or even reflects, light is blue and red shifted, at the same time. Most things aren't noticeable. But even a guy walking down the side walk is blue and red shifted. If you're standing behind him he's red shifted, if you're in front of him and he's coming towards you he's blue shifted. You'd need some serious instrumentation to be able to notice it, but it's there regardless.
aladdinwa
Asteroids and meteors do not travel even nearly fast enough to blue or red shift the light reflected off of them.
Snowwie888
In order for us to see asteroids they must be very close to Earth. On such a small distance a blue shift is hardly visible.
Randy P
In the case of asteroids and meteors outside our atmosphere, that light would be reflected light from the sun. But yes, if the object was coming toward us, the reflected spectrum should be blue-shifted compared to the spectrum of light directly emitted by the sun.