Astronomy Essentials

2023 Eta Aquariid meteor shower: All you need to know

May 2023 meteors … the Eta Aquariids

Moonlight will obscure the 2023 Eta Aquariids.

When to watch: Full moon falls at the peak of the 2023 Eta Aquariid shower. If you want to try watching in moonlight, try the mornings of May 5, 6 and 7, 2023, in the hours before dawn. Why before dawn? See “Radiant” below. The American Meteor Society is listing 15 UTC on May 6 as the shower’s predicted* peak time. But times vary between different experts. And the peak of this shower stretches out over several days. So you can expected elevated numbers of meteors a few days before and after the peak time … albeit in moonlight.
Nearest moon phase: In 2023, full moon will fall at 17:36 UTC on May 5. Moonlight will obscure the 2023 Eta Aquariids.
Radiant: Rises in the wee hours, climbing toward its highest point at dawn. That’s why before dawn is the best time to watch this shower.
Duration of shower: April 15 to May 27.
Expected meteors at peak, under ideal conditions: In the southern half of the U.S., you might see 10 to 20 meteors per hour under a dark sky, with no moon, when the radiant is high in the sky. Farther south – at latitudes in the Southern Hemisphere – you might see two to three times that number.
Note: The Eta Aquariids’ radiant is on the ecliptic, which rides low in the sky on spring mornings as seen from the Northern Hemisphere. That’s why this shower favors the Southern Hemisphere. It’s often that hemisphere’s best meteor shower of the year … but not in 2023, when moonlight will drown out most meteors.

Visit EarthSky’s meteor shower guide for 2022

Report a fireball (very bright meteor) to the American Meteor Society: it’s fun and easy!

Lines marking constellation with radial arrows near middle of it.
The radiant point of Eta Aquariid meteor shower is near the star Eta Aquarii in the constellation Aquarius the Water Bearer. The radiant rises in the wee hours after midnight and is still climbing toward its highest point at dawn. That highest point is in the south as viewed from the Northern Hemisphere, closer to overhead for the Southern Hemisphere. That’s why the Southern Hemisphere sees more meteors (the radiant is higher up), and it’s why – for all of us around the globe – the hours before dawn are best for this shower.

The Eta Aquariids’ parent comet

From Don Machholz, who has discovered 12 comets

The object responsible for the Eta Aquariid meteor shower – that is, its parent comet – is the famous Halley’s Comet. This comet is in a retrograde orbit around the sun. That means it runs around the sun in the opposite direction from Earth and all the other planets. As a result, we pass near its path twice, one time along the outbound portion of the comet’s orbit. That happens every early May, causing the Eta Aquariid meteor shower. The other time is along the inbound portion of the comet’s orbit, and that passage causes the Orionid meteor shower in late October of each year.

Halley’s Comet orbits the sun on an average of every 76 years (the range is from 74 through 79 years due to perturbations of the planets). So, in most years, the comet is nowhere near when we sweep through its orbit, and when debris left behind by the comet enters our atmosphere to create Halley’s two meteor showers.

Perhaps you saw Halley’s Comet when it returned last, in 1985/86. It has been observed since the year 240 BCE.  Halley’s Comet will be back in 2061. Presently the comet is traveling away from the sun at about 0.6 miles a second (1 km/sec). In the year 2022, Halley’s Comet is beyond the orbit of Neptune.

In December of 2023, the comet will reach its farthest point from the sun that binds it in orbit. Then – pulled inexorably by the sun’s gravity – it will curve around and head back toward the inner solar system again.

While waiting for Halley’s Comet to return, watch for the next best thing: the Eta Aquariid meteor shower in early May.

Comet, bright head and cone-shaped tail against star field.
Halley’s comet, the parent of the May Eta Aquariid and October Orionid meteor showers. Dust from this comet will light the night as Eta Aquariid meteors on the morning of May 5. Image via NASA.

More about this shower’s radiant

If you trace the paths of the Eta Aquariid meteors backward, they all seem to radiate from a certain point in front of the constellation Aquarius the Water Bearer. This point on the sky’s dome is called the radiant of the meteor shower, which nearly aligns with the faint star Eta Aquarii. Hence, this meteor shower gets its name from this star.

Eta Aquarii is one of the four stars making up the Y-shaped Water Jar asterism in the northern part of Aquarius. If you can find the Water Jar in the constellation Aquarius, you’ve as good as located the radiant point for the Eta Aquariid meteors. The alignment of the radiant and the star is, of course, coincidental. Eta Aquarii is some 170 light-years away – trillions upon trillions of miles away – while the Eta Aquariid meteors burn up nearby – only 60 miles (100 km) above Earth’s surface.

Meteor shower radiants are sometimes misunderstood by casual meteor-watchers. You don’t need to know where they are to watch a meteor shower. That’s because the meteors fly every which way across the sky, in front of numerous constellations. However, the higher a shower’s radiant appears in your sky, the more meteors you’re likely to see. For the Eta Aquariids, the radiant soars highest in the nighttime sky just before dawn. That’s one of the reasons why you can expect to see the most meteors in the wee morning hours.

How to view a meteor shower

As with all meteors in annual showers, no special equipment to watch the Eta Aquariids. But a little luck always helps.

Find a dark, open sky away from artificial lights, and sprawl out on a reclining lawn chair.

Make yourself comfortable with a hot flask of you favorite beverage. Keep warm but not so snug that you fall asleep!

Meteor watching is a lot like fishing. Sometimes you catch a good number of them, and sometimes you don’t.

Eta Aquariid meteor shower photos from EarthSky’s community

Thin vertical bright line in dark blue sky, with a tall Saguaro cactus in the foreground.
You can see the Eta Aquariids’ radiant point – the Water Jar asterism in the constellation Aquarius, visible as a noticeable pattern of 4 stars in the top left – in this photo by Eliot Herman in Tucson, Arizona, on May 4, 2020. Thank you, Eliot!
Cloudy stretch of stars with streak in left corner.
View at EarthSky Community Photos. | Mary Jo Machnica in Hamburg, NY, captured this photo of an Eta Aquariid on May 6, 2021. She wrote: “I knew that the Eta Aquarids Meteor Shower was going to peak this morning. I took a nap, not setting my alarm. If I was awoken I would go out. 3 was peak viewing. I awoke at 2 AM. Ezra and I head out. Not going to far from home. I knew there was going to be a ton of light pollution. But, it didn’t matter. I just needed to be under the stars. Needing to feel small. Needing to know that the G-d of the Universe is in control of everything. Getting there right before 3AM. I set up my camera. Super damp out! Glad I have my lens warmer. With everything set up. I just keep taking photo after photo hoping to capture a glimpse of a meteor. I see a couple Meteors with my eyes, but they don’t show up in the photo….That’s ok. I keep snapping away. Talking outloud to the Creator of the Universe. Just Ezra and I was talking, this shot was taken.”

Bottom line: May’s Eta Aquariid meteor shower has a broad peak and often can be watched over several mornings. But, in 2023, moonlight interferes.

*Predicted peak times and dates for 2023 meteor showers are from the American Meteor Society. Note that meteor shower peak times can vary. Back to top.

Read more: Why the Eta Aquariids are best from the Southern Hemisphere.

Meteor showers: Tips for watching the show

Posted 
January 8, 2023
 in 
Astronomy Essentials

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