The annual Orionid meteor shower is set to reach its peak this week, giving skywatchers an opportunity to observe one of the major celestial events associated with Halley’s Comet. However, a bright, large moon is expected to limit visibility during the early part of the night, with viewing conditions likely to improve after it sets late at night.
According to the American Meteor Society, observers could see up to 20 meteors per hour under ideal conditions during the peak from Wednesday night into Thursday morning. The shower remains visible for several weeks before and after its peak, allowing observers additional opportunities to catch the display.
The Orionids can be seen from both the Northern and Southern hemispheres after midnight. Although the shower takes its name from the Orion constellation, the meteors can appear across the night sky, according to NASA.
Known for their speed and brightness, Orionid meteors sometimes leave glowing trails that remain visible for several seconds. Their appearance is caused by small pieces of cosmic debris entering Earth’s atmosphere at high speeds and burning up.
What causes the Orionid meteor shower?
Meteor showers occur several times a year when Earth passes through trails of debris left behind by comets and, occasionally, asteroids as it orbits the Sun.
The Orionids originate from Halley’s Comet, which passes near Earth approximately once every 75 years. As Earth crosses the debris trail, small particles enter the atmosphere at high speeds. Friction and interactions with the surrounding air cause the particles to heat up and burn, producing bright streaks of light commonly known as shooting stars.
During the Orionid shower, some meteors can appear particularly bright and fast. In certain cases, the surrounding atmosphere glows briefly, creating a luminous trail that persists for several seconds after the meteor has passed.
Despite their dramatic appearance, meteor showers can be observed without specialised equipment. NASA notes that the Orionids are visible across the night sky, so observers do not need to look exclusively towards Orion to spot them.
The number of meteors visible depends on several factors, including the time of night, weather conditions, moonlight and artificial light pollution. While the American Meteor Society estimates that up to 20 meteors per hour may be visible under ideal conditions during the peak, actual sightings can vary considerably.
Best time and conditions to watch the meteor shower
The best time to observe the Orionids is generally after midnight and during the early hours before dawn. During this period, viewing conditions can be more favourable, particularly when moonlight is limited.
This year’s bright moon is expected to interfere with visibility until it sets late at night. Observers may therefore have a better chance of spotting meteors during the later hours of the night and before sunrise.
Finding a location away from city lights, streetlights and other sources of artificial illumination can also improve the viewing experience. Open areas with a clear view of the sky are preferable, provided local weather conditions are suitable.
Allowing the eyes several minutes to adjust to darkness is another important step. Observers should avoid looking at bright phone screens or other light sources while waiting for meteors to appear, as this can make faint streaks harder to see.
No telescope or binoculars are required. Since Orionid meteors can appear in different parts of the sky, watching a broad area rather than concentrating on one constellation can improve the chances of spotting them.
Those who miss the peak will still have opportunities to observe the shower, as Orionid activity continues for a few weeks on either side of its maximum. The next major meteor shower identified in the report is the Southern Taurids, which are expected to peak on November 5. A crescent moon is forecast for that period, potentially creating more favourable viewing conditions than those expected during the Orionids’ peak.
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