How do I...set target sprite distance from player?

Hello,

I'm trying to make a top-down shooter. The player sprite is moved by 8Direction keys. I want to set a target sprite:

e,g, target | Set position to (Player,X, Player.Y - 100)

and lock it to that distance from player, so if player moves between angle, the target will rotate or move to the players direction

[sorry, I'm a maths failure and I'm trying studying algebra again]]

--example-----

[t]

target

player

-------------

if player is facing north and presses key D, then

[t]

target rotates from North to East at set distance from payer.

I HOPE THIS MAKES SENSE!

The easiest way I can think of is, have a circle set against player and target follows cursor, but is restricted to circle (this is not the preferred method).

Thanks again,

Roberto