The Orionids is an average shower producing up to 20 meteors per hour at its peak. It is produced by dust grains left behind by comet Halley, which has been known and observed since ancient times. The shower runs annually from October 2 to November 7. It peaks this year on the night of October 21 and the morning of October 22. Best viewing will be from a dark location after midnight (just after Moonset). The meteors will radiate from the constellation Orion, but they can appear anywhere in the sky.