Asteroid Zoo Talk

Black Dots Moving

  • kalspaugh by kalspaugh

    In frames 3 and 4 of this sequence, I see two black dots moving in the lower left hand corner? I logged it as an asteroid, but I am not sure what it is. Is it an anomaly on the image or something else?

    Posted

  • MvGulik by MvGulik

    Those are telescope related artifacts.
    They come in black and white variations, and they can even change color in a single set.

    Any telescope related artifact is directly identifiable by the distinct relative virtual motion it makes.
    (The upside-down T)
    From frame 1 to frame-2: Up
    From frame 1 to frame-3: Right.
    From frame 1 to frame-4: Left.

    See here for the movement reason.
    See A guide to artifacts for more artifact related information.

    Posted