This app simulates the trajectories of nearby asteroids which would possibly be doubtlessly dangerous to Earth. You can watch in actual time where they're, were, or might be at any given time.

All trajectories of the asteroids shown listed here are based mostly on actual knowledge from NASA's Near Earth Object Program:

http://neo.jpl.nasa.gov/

This free version incorporates 50 asteroids, including the next:

- 1981 Midas

- 2101 Adonis

- 2135 Aristaeus

- 2201 Oljato

- 2340 Hathor

- 3200 Phaethon

- 3361 Orpheus

- 3362 Khufu

- 3671 Dionysus

- 4034 Vishnu

- 4179 Toutatis

- 99942 Apophis

Besides the asteroids, you can even watch the next planets:

- Mercury

- Venus

- Earth

- Mars

- Jupiter

Get the total model to look at over one thousand near-earth asteroids. The full model contains all asteroids known by NASA whose trajectory comes nearer than 0.02 AU to Earth's orbit, and which measurement is larger than 50m in diameter.

NOTE: Asteroid trajectories are inherently unstable, so they're troublesome to foretell far into the lengthy run. The trajectories calculated by this app cannot be thought of 100% accurate, significantly for dates far into the longer term.