PHAntom Viewer is an interactive display of known asteroids and comets designated as "Potentially Hazardous Objects." This means that each object is on an orbit which takes it within a very close approach to Earth at some point in time and, in the case of an impact, carry the potential to cause significant or catastrophic damage.
Orbital information on more than 1,400 "PHOs" and the planets are obtained from the NASA/Jet Propulsion Laboratory periodically to keep the list current. Orbits as portrayed are static and effects from gravitational influences, such as a close encounter with Earth or Jupiter, have not yet been implemented. While planet and asteroid orbits are to scale, the planet sizes and Moon orbit have been exaggerated.
This is built as a WebGL experiment using Three.js and is expected to work in the latest versions of Google Chrome, Firefox, & Internet Explorer 11.
Asteroids and comets that come within the configured maximum distance window (default of .15 AU, or 22.5 million kilometers) are shown. They are colored from green to red as the object approaches Earth, with bright red indicating a very close approach. Objects within the distance window will be displayed in the list on the top right.