High Quality Content by WIKIPEDIA articles! The Orionid meteor shower, usually shortened to the Orionids, is the most prolific meteor shower associated with Halley`s Comet. The Orionids are so-called because the point they appear to come from, called the radiant, lies in the constellation Orion, but they can be seen over a large area of the sky. Orionids are an annual meteor shower which last approximately one week in late-October. In some years, meteors may occur at rates of 50-70 per hour.