Category: Meteorites

What a fantastic month for skywatching. On August 12th, we’ve got the Perseid meteor shower. On August 28th there’ll be a total lunar eclipse. And on September 1st, there might be another meteor shower to enjoy: the Aurigids.

Unlike the dependable Perseids, the Aurigid meteor shower is unpredictable. They’re a stream of particles left behind by Comet Kiess (C/1911 N1). This is a long period comet that has only visited the inner solar system twice within the last two thousand years. Its last visit is believed to have been 83 BC.

On September 1, 2007, the Earth will pass through the dusty trail left behind by Comet Kiess, and it might be a spectacular show. Or it might be a non-event.

“We have so little experience with ancient debris from long-period comets,” notes Bill Cooke of NASA’s Meteoroid Environment Office (MEO) at the Marshall Space Flight Center. “Almost anything could happen—from a fizzle to a beautiful meteor shower.”

Astronomers have predicted that the peak of the shower will occur at approximately 1136 UTC (7:36 am EDT), and last for about 2 hours. It should be visible to observers in Western North America, the Pacific, and Eastern Asia.

One prediction calculated that there could be as many as 100 meteors an hour. That’s pretty good, but not at meteor storm levels, like the Leonids. One unique attribute about the Aurigids is that they leave a brilliant blue-green streak in the sky. Scientists think this might be because Comet Kiess is such a long period comet, spending much of its time in the darkness of the outer Solar System, its particles are relatively untouched by the Sun

So, I can’t guarantee anything. But the weather should still be warm on September 1st. School hasn’t started, and many of you will be looking for an excuse to enjoy the night sky with your friends and family.

Now you’ve got something to do. Go see the Aurigid meteors.

Original Source: NASA Science

Asteroid 4 Vesta is the second largest asteroid in the Solar System, stuck between the orbits of Mars and Jupiter. It was fully formed early on, turning solid and crystallizing within 10 million years of the Solar System’s formation. How do scientists know this? They’ve found a little piece of it right here on Earth. A Vesta meteorite discovered in Antarctica that tells the history of the early Solar System.

A study is being led by researchers from the University of Toronto. Their subject is a volcanic meteorite discovered in Antarctica during a recent survey. The space rock contains tiny zircon crystals that match the chemical makeup of Asteroid Vesta. It belongs to a class of objects called eucrites – meteorites that formed from volcanic activity.

Scientists believe that Vesta was quickly heated, and then melted into a metallic and silcate core, similar to the process that happened here on Earth billions of years ago. The radioactive decay from abundant minerals in the early Solar System was thought to provide the energy for this process.

Based on their analysis, this meteorite – and therefore Vesta – was once boiling rock that quickly turned solid and crystallized. This change, from liquid to solid happened within 10 million years of the Solar System’s formation. This information gives scientists clues about how our own planet solidified out of the Solar System’s protoplanetary disk.

Original Source:University of Toronto News Release

My favourite meteor show is less than 2 weeks away now, so I wanted to give you all another gentle reminder to get organized and make sure that you’re able to enjoy the Perseid meteors this year – the shower will be peaking on the night of August 12, and into the next morning. It’s going to be a special event because the shower coincides with a new moon. The sky will be at its darkest, and the meteors will be at their brightest.

The shower gets its name because they will appear to originate from the constellation of Perseus. Don’t worry about finding the constellation, though, just lay on your back and stare up, you’ll see them.

On the evening of August 12, the first thing you’ll want to do is head outside shortly after sunset. If you’re lucky, you’ll see “earthgrazers”. These are some of the most beautiful meteors that you’ll see in the whole evening. Then settle down, find some satellites, and wait for the show to really get going. It you’ve got the stamina, the best viewing will happen in the early dawn hours of Monday, August 13th. At that point, you could be seeing a few dozen every hour.

To really get the best experience out of this, travel away from the lights of the city. Here in Vancouver, we need to get about 50 km away to start seeing the Milky Way above our heads. We’ve got a dark sky park in a suburb called Abbotsford that’s perfect.

So get organized. Book the evening with your friends, map out where you’re going to go. Bring hot drinks, warm clothes, and a comfortable place to sit back and enjoy the show.

And if you’re interested, Pamela and I recorded an episode of Astronomy Cast dealing with meteors and meteor showers, so you can listen in the car before you reach your viewing spot.

Enjoy, and let me know how it goes.

My absolute favourite meteor shower every year is the Perseids. They’re not the most spectacular meteors of the year, but the weather’s nice and warm here in Canada. We always head back home to Hornby Island to visit the family at Perseid time to enjoy them with nice dark skies. We keep the kids awake as long as possible, and then lay back on a mattress, enjoying the sky show.

And this year’s going to be a great one: no moon.

That’s right, there’s going to be a new moon on Sunday, August 12th, the exact same time that the Perseid shower is peaking. Without the glare of the Moon, the meteors will be at their brightest. But to really enjoy the show, you’ll want to head outside your city, away from the glare.

Like all meteor showers, the Perseids get their name from the constellation the meteors originate from. The constellation is in the northeast. As soon as it starts to get dark, you should start seeing meteors streaking across overhead. It’ll probably just be a couple every minute, but by early morning, when the shower is peaking, you could even see a few dozen a minute.

And as a special bonus, Mars is going to be in the sky as well. It’ll appear to be a bright red star also in the northeast.

I want you to organize something for the Perseids this year. Gather together some great friends, head somewhere dark, and plan to enjoy a great show. Put it on your calendar right now.

Promise?

Original Source: NASA