Sky-gazers may get a good chance to see fireballs streak across the night sky this week. Two meteor showers — the Alpha Capricornids and Southern Delta Aquariids — will reach their peak and another is ramping up.
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The Alpha Capricornids meteor shower, which is best known for producing very bright meteors called fireballs that may look like shooting stars, will be most visible at 1 a.m. ET Wednesday, according to Robert Lunsford, fireball report coordinator for the American Meteor Society. Its radiant — the point at which the meteor streaks seem to originate — is in the Capricorn constellation.
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The Alpha Capricornids are visible all over the world but are usually best seen from the Southern Hemisphere, in places such as Australia and Africa, according to Bill Cooke, the lead for NASA’s Meteoroid Environments Office. These meteors are expected to appear at a rate of three to five per hour. If you are viewing from the Northern Hemisphere, keep your eyes low along the southern sky to catch a glimpse.
If you stay up later, you’ll be able to see the Southern Delta Aquariids reach peak activity at 3 a.m. ET on Wednesday, said Lunsford. The Southern Delta Aquariids, which also are most visible in the Southern Hemisphere, make for a stronger shower than the Capricornids; people located in parts of the Northern Hemisphere such as the US can expect to view up to 10 to 15 meteors per hour, while those in the Southern Hemisphere may see 20 to 25 per hour.
The Aquariids appear to stream from the southern part of the Aquarius constellation, which is around 40 degrees east of the Capricorn constellation, according to Lunsford: “They’re going to kind of do a battle, shooting back and forth at each other.”
Both showers will be visible through August 13, though there is some disagreement about the date on which their peaks will occur. While experts at the American Meteor Society say peak activity will occur Tuesday night into early Wednesday morning, those at NASA say it will happen Wednesday night going into Thursday.
“The time of a meteor shower peak is not constant from year-to-year. It can vary by plus or minus a day or two,” Cooke said.
But missing the peak, according to Lunsford, is nothing to fret about. “It’s not a real sharp peak …You can go out (on) the 31st or the 29th and see pretty much the same activity.”
For the best viewing, avoid areas with bright lights and objects that could obscure your view of the sky, such as tall trees or buildings. Picking a spot with a higher altitude, like a mountain or hill, may make it easier to spot these showers. |
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發表於 8-1 11:07:09
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