If you missed out on seeing Halley's Comet during its last Earth flyby in 1986, don't despair — you can spot tiny pieces of the icy wanderer overhead this week.

Dusty debris that Halley's Comet has shed on its 75-year-long laps around the sun slams into Earth's atmosphere during the first week of May every year, creating an annual meteor shower known as the Eta Aquarids. (Another Halley-spawned shower, the Orionids, occurs every October.)

The Eta Aquarids are usually the year’s richest meteor shower for Southern Hemisphere observers, but north of the equator it's one of the more difficult annual displays to observe. [See photos from past Eta Aquarid meteor showers]

This year, the shower will peak in the predawn hours Thursday and Friday (May 5 and May 6). From mid-northern latitudes, the radiant — the spot in the sky from which the meteors appear to emanate — rises at about 1:30 a.m. local daylight time, scarcely 2 hours before morning twilight begins to interfere.

At peak activity, observers at 26 degrees north latitude — that's around Brownsville, Texas or the Florida Keys — should be able to see about a dozen Eta Aquarid meteors, provided viewing conditions are good. But that number falls to practically zero north of 40 degrees (the latitude of New York City).

You might catch an Earthgrazer

But don't give up hope if you live north of New York City. You still have the chance to see a very special kind of meteor — an Earthgrazer. 

Earthgrazers skim the top of Earth's atmosphere like a stone skipping across the surface of a pond. They appear when the radiant of a meteor shower is near the horizon, and meteoroids streak horizontally overhead rather than down through the sky.

Earthgrazers are rare; an hour of watching might produce one or two at most, but that's plenty. These meteors are sometimes colorful and gracefully slow, and people who are lucky enough to see one talk about it for years.

During the 2001 Leonid meteor shower, I was stationed just outside of Benson, Arizona, and caught sight of an Earthgrazer. It bolted straight up out of the northeast and took about 10 seconds to traverse nearly the entire sky, passing almost directly over my head in the process.

The meteor did not leave a streak or trail; rather, it appeared as a small, white glowing ball. I felt like an outfielder at a baseball game watching a home run sail right over my head.

Looking for Earthgrazers is simple: Spread a blanket on the ground, lie down and look up. A reclining lawn chair facing southeast works just as well. Eta Aquarid Earthgrazers streak overhead, flying generally southeast to northwest.

The Eta Aquarids remain active at about one-half peak strength for a couple of days before and after the maximum. Conditions this year are excellent; the moon is absent from the predawn sky for more than a week around maximum.

Source:
courtesy of SPACE

by Joe Rao

If you have any stories or news that you would like to share with the global online community, please feel free to share it with us by contacting us directly at [email protected]