Summer Friday Blog: Journey into Outer Space for the Delta Aquarid Meteor Shower

11156716_lThis week we travel to outer space, the Final Frontier, to catch a glimpse of the Southern Delta Aquarid Meteor Shower. But don’t worry, you don’t have to leave your backyard. Just grab a blanket and find a place without too much light pollution, and you’ll be able to catch a glimpse of this worldwide phenomenon.

The Southern Delta Aquarid Meteor Shower is an annual summer occurrence that spans July and August, but this weekend marks its nominal peak in activity. From July 26th through August 1st, give or take a couple of days because nature is lovably fickle, we can expect a maximum hourly rate of 15-20 meteors. That might not sound like much, but a special angle of atmospheric entry gives Delta Aquarid meteors long, lingering trails that seriously set this shower apart.

Most meteor showers are created by comets. As a comet circles our Sun, it sheds a rocky dust stream along its orbit. When Earth travels through this space litter, the result is a meteor shower. Astronomers believe that the Southern Delta Aquarids originated from the breakup of two sungrazing comets, Marsden and Kracht.

Shooting stars, as they’re lovingly called, can appear anywhere in the sky, but if you trace the tails it becomes clear that each shower has a definite epicenter. The showers are named after these radiant points, taking the name of the constellation dominating that particular region of the sky. The Delta Aquarids, as you can probably guess, pay homage to the constellation Aquarius. Look for the star Skat within the “water bearer” constellation, the point where Delta Aquari meteors are born.

For every time zone and all continents, the hours between midnight and dawn will be the best time to glimpse these brief celestial bodies. Those of you in the southern hemisphere and southerly latitudes in the northern hemisphere will get a better show, as is typical with this particular shower, though all observers are bound to see activity. Unfortunately, this year the waning crescent moon rises around midnight and will drown out dimmer meteors. But we’ll still see the big ones, and those are arguably the most thrilling.

Meteors are really just bits of interplanetary debris traveling tens of thousands of miles per hour, igniting as they vaporize in Earth’s upper atmosphere, but they sure are pretty. For a preview, take a look at this video of last year’s meteor shower, filmed August 2 by Canadian Geographic.

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Kathryn is a summer intern with the Scientific Communications team at Promega Madison.

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