Beautiful mornings for skywatchers; Perseid meteor shower warming up

This morning’s lunar crescent through the branches of a spruce tree. The crescent is lit by the sun; the remainder by light reflected from the Earth to the moon and back again. Credit: Bob King

Is there a more peaceful experience than standing under a dawning sky with a crescent moon to greet your gaze? I hope you’ve had a clear morning recently to follow the march of the moon toward the trio of Jupiter, Mars and Mercury.

View to the east 50 minutes before sunrise this morning shows the moon and a beautiful planet lineup. Credit: Bob King

For skywatchers in across North America the International Space Station started up a round of bright passes at dawn last week and will continue through the third week of August. Add in the first  Perseid meteors and there’s always something to see in the greatest wilderness that ever was – the night sky.

A 2-minute time exposure caught the International Space Station traveling to the southeast to the right of the moon (overexposed) and Jupiter. Click photo to find when the station is visible over your town. Credit: Bob King

The Perseid shower will peak on Monday morning August 12 with 60-80 meteors per hour expected from a dark location. After the Geminids of December, this is the best meteor shower of the year and the most easily watched. No need for a heavy parka in August. Just put on a sweater and relax in the recliner or hot tub as hot bits of Comet Swift-Tuttle race to oblivion overhead. We’ll have more on the shower and what to expect in a few days.

Perseid meteors appear to radiate for a point in the sky just below the W of Cassiopeia in the constellation Perseus the Hero. Watch for early arrivals tonight through next week. Created with Stellarium

Like many meteor showers, it’s a good idea to watch for early arrivals a few days in advance. I saw a Perseid two nights ago and have heard reports of several nice fireballs. Characteristic of the shower, many meteors leave streaks or what astronomers call “trains”. These may look like dust trails but they’re glowing “tubes” of ionized air molecules.

I leave you with our good friend Orion the Hunter peeking over the eastern horizon about 75 minutes before sunrise this morning. Can you find the famed trio of stars that form his Belt? Credit: Bob King

The meteoroid – what a bit of comet grit is called before it becomes a meteor – plows into the air at many thousands of miles per hour, energizing the molecules. Upon return to their rest states, each gives off a brief flash of light contributing to the evanescent train.

Fingernail moon pops in on three dawn planets this week

The ever-thinning moon glides by three separate planets in the dawn sky – Jupiter, Mars and Mercury. Mars will be rather faint and may still require binoculars to see well. Jupiter and Mercury will be easy to spot. The map shows the sky facing east about an hour before sunrise. Stellarium

There’s some cool stuff going down in the dawn sky with the crescent moon and planets starting tomorrow and continuing through Monday.

The show begins tomorrow morning Aug. 2 with the moon midway between bright Jupiter and the Bull’s Eye Star Aldebaran in Taurus. On Saturday an even thinner crescent shines to the right of Jupiter. Come Sunday the sliver moon forms a diamond with Jupiter, faint Mars and brighter Mercury low in the northeastern sky. Great stuff for early risers!

For a fun challenge, you might still see the crescent on Monday morning Aug. 5 directly below Mercury 40 minutes before sunrise. The moon will be only one day before new moon phase and breathtakingly thin.

John Chumack of Ohio caught this very nice southern Delta Aquarid meteor late on July 29 using a 17mm lens, ISO 800 and 20-second exposure.

You’ll also notice winter’s taskmaster Orion coming up in the eastern sky and maybe even catch a few southern Delta Aquarids flying around. I saw two last night.  One crossed the Great Square of Pegasus in the east at 11 p.m. and left a wonderful chalky trail. The other zipped through Corona Borealis the Northern Crown in the western sky. Expect meteors any time these August nights, even early Perseids. You’ll be able to tell those from the others if their trails point back to the northeastern sky near the W of Cassiopeia.

Delta Aquarid meteor shower kicks off summer meteor-watching season

The Delta Aquarid shower will appear to radiate from a point in the sky in the zodiac constellation Aquarius about two outstretched fists above Fomalhaut, the sole bright star in the southern sky at the time. The map shows the sky facing south at 2 a.m. Created with Stellarium

Wahoo! It’s that time of year again. Meteor showers are back on the menu beginning with the southern Delta Aquarids which peak Tuesday morning July 30. This long-duration shower begins around July 14 and finally peters out more than a month later on Aug. 18. Tuesday morning we might see between 15-20 meteors per hour.

Southern Delta Aquarid meteor caught on video in 2009 by astrophotographer John Chumack

The Delta Aquarids radiate from low in the southern sky as seen from mid-northern latitudes. A low radiant means many of a shower’s meteors are out of view, streaking away below the horizon. Expect lower counts if you live in the northern half of the U.S. , Canada and Europe. Most of the Delta Aquarids will shoot north, east and west from the constellation Aquarius. The farther south your location then, the more meteors you’ll see.

The Delta Aquarids make for a consistent shower even if the numbers for northerners aren’t particularly good. Lest you lose heart, we experience the same situation every May with the Eta Aquarid meteor shower. Despite the radiant’s location low in the east at the start of dawn, that stream put on a fine show this past May with a volley of memorable Earth grazers.

I got lucky once and caught a portion an Earth-grazing Leonid meteor trail during the November 2009 shower. The trail was white to my eye but shows up green in the photo. I suspect the color comes from oxygen atoms that were ionized or “excited” by the meteor’s passage in the upper atmosphere. Credit: Bob King

Earth grazers are meteors that strike the Earth’s atmosphere at a very shallow angle, coming up from below the horizon and vaulting across more than half the sky. They’re more likely to be seen when the meteor radiant is near or below the horizon. Keep an eye out for them Tuesday morning.

It’s takes fortitude to catch a meteor shower during the work week, but I plan to be out there and hope you will too. To see the bestest, mostest meteors, find a dark location with a good view to the south. Set up a comfortable lounge chair facing south-southeast and plan to watch between about 1 a.m. and dawn. If you wanted to limit your sleep sacrifice to one hour, go for 3-4 a.m. This is when the radiant will be highest in the south just before dawn.

Be aware the last quarter moon, located well off to the east in Aries, will brighten the sky enough to compromise the fainter meteors. As you kick back, you’ll see gritty bits of Comet 96P/Machholz flash to incandescence above. Comets shed dust and small rocks as they round the sun on repeated trips to the inner solar system.

Comet 96P/Machholz, discovered by amateur astronomer Don Machholz on May 12, 1986 is the comet responsible for the southern Delta Aquarid meteor shower. Credit: NASA

When Earth’s orbit intersects the stream of debris, as it does every summer with Machholz, we smack right into the grit, which vaporizes in a streak of light called a meteor. The Delta Aquarids hit the atmosphere at around 90,000 mph (145,000 km/hr), which sounds and is incredibly fast, yet that about average for a meteroid entry.

The northern Delta Aquarids (July 16 – Sept. 10), Alpha Capricornids (July 15 – Aug. 10) and several other minor showers active at the same time as the southern Delta Aquarids add even more spice to late July and August nights.

Like a fireworks display that ends in a grand finale, the Perseid shower will cap off the show on August 12-13 with 60-100 meteors per hour and no moon to interfere. Happy hunting!

 

Morning aurora topped off by avian cheer

A pretty series of rays sprouts above a pair of green arcs this morning around 3 a.m. CDT. Photo: Bob King

I got up for the stars but stayed for the birds. Clear skies overnight allowed for a look at a surprise aurora display, comets PANSTARRS and Lemmon, a handful of spectacular Eta Aquarid meteors and an attractive lunar crescent early this morning.

Three images from NASA’s Solar Dynamics Observatory were combined to create this spectacular view of last Friday’s flare. Credit: NASA

No auroras were predicted and true-to-forecast all looked quite at least through midnight. But at 2:30 this morning a bright green band spanned the northern horizon punctuated by one, two and occasionally an entire series of faint, rosy rays.

Sunspot group 1734’s largest spot – at left – is several times the diameter of Earth. This photo was taken this morning May 6, 2013. Credit: NASA

Expect more excitement courtesy of our parent star. Last Friday, a big flare erupted along’s the sun’s eastern edge, hurling a dragon-like tongue of incandescent hydrogen gas 120,000 miles (193,000 km) above the surface. Although this storm wasn’t directed toward Earth, the large sunspot group 1734 is currently nearly face-on to the planet and has the potential for strong flares. Cross your fingers.

A bright Eta Aquarid streaks across the northern sky and aurora this morning around 2:45 a.m. Photo: Bob King

I had planned to look at a variety of objects in the telescope but kept getting “distracted” by both the northern lights and regular appearances of incredibly fast, long-trailed meteors streaking across the northern sky from the east – Eta Aquarids.

Because the shower has a broad peak I encourage you to go out for a look yourself. Being so far north, I figured only a few might be seen here in Duluth, Minn. but was happily proven wrong. Had I simply sat in a lawn chair and stared skyward I’m certain I would have seen many more. Click HERE for more on the shower and how to view it.

A wide-field photo of Comet C/2011 L4 PANSTARRS shot on May 4, 2013. The comet is oriented the way it would appear shortly before dawn with the anti-tail pointing down and broad dust fan opening to the left. Credit: Joseph Brimacombe

Let me tell you about Comet PANSTARRS. In 10×50 binoculars I was surprised by how much there was to see under a dark sky. The V or fan-shaped tail spread is still obvious marked at its base by the small, brighter comet’s head. A second, straight anti-tail (debris left by the comet along its orbital path) stuck out like a pinkie finger from one side.

I estimated the whole works measured 1 degree or two full moon diameters across. While faint and smoky-looking at magnitude 7, the comet was very easy to pick out. In a 15-inch telescope PANSTARRS and its dual tails were brighter and better-defined; a tiny star-like nucleus peeped through the gases and dust concentrated in the its head. Very beautiful.

A morning topped off by the crescent moon is never wasted. Photo: Bob King

On to Comet Lemmon. I didn’t see it until 4 a.m. when dawn’s first light had already put its pale stamp on the eastern sky. I found it with difficulty in binoculars as a small, dim soft patch of light below the lower left star in the Square of Pegasus VERY low in the northeastern sky. It’s about as bright as PANSTARRS but low altitude and the onset of twilight combined to make it look fainter. In the scope, Lemmon was a big pale green fuzzball with a hint of a tail pointing southwest. Care to find it yourself? Here’s a map.

Wherever you are, enjoy the coming nights. If the moon’s your thing, an even thinner crescent will rise an hour before sunrise tomorrow in the east. Check for northern lights before you turn in tonight and use the map from yesterday’s blog to try your luck at Comet PANSTARRS … one last time.

 

Cassini sees meteoroids pummeling Saturn’s rings

Larry Beck was watching TV last Friday night when he heard a loud crash on his roof. Beck thought something that had fallen off a plane since his home is in the flight path of a nearby airport. When he went into the attic to look, he discovered a hole in his roof and a softball-sized rock, which was soon confirmed as a meteorite. Credit: NBCConnecticut.com

The spectacular fireball over Chelyabinsk, Russia in February and a more recent meteorite fall through the roof of a home in Wolcott, Connecticut last Friday remind us the solar system is still littered with debris left over from its formation 4.6 billion years ago.

Piles of small meteorites dropped by the Chelyabinsk fireball on Feb. 15, 2013 and collected by meteorite hunter Mike Farmer. Credit: Mike Farmer

During and immediately after the formation of the planets, meteorite bombardment was nonstop. Since then the impact rate has dropped dramatically – a good thing for life – but continues to this day as a steady rain of everything from fine dust to the occasional teeth-rattling meteorite strike.

Five images of Saturn’s rings, taken by NASA’s Cassini spacecraft between 2009 and 2012, show clouds of material ejected from impacts of small objects into the rings. Click for large version. Credit: NASA/JPL-Caltech/Space Science Institute/Cornell

Besides Earth, amateur and professional astronomers have recorded meteorite or comet strikes on the moon and Jupiter. Now we can add Saturn to the list. Detailed study of thousands of images sent back to Earth by the Cassini spacecraft have turned up nine meteoroid strikes on Saturn’s rings in 2005, 2009 and 2012.

Think of the rings as a giant meteoroid detector/collector. If Earth gathers some 37,000-78,000 tons of space debris per year (mostly as dust but approx. 3-8 tons as rocks weighing 1/3 ounce to 2.2 lbs.), Saturn’s rings, with a surface area 100 times that of our planet, is more like humpback whale during feeding season.

This illustration shows the shearing of an initially circular cloud of debris as a result of the particles in the cloud having differing orbital speeds around Saturn. The numbers in the lower left of the panels in the still image show how quickly a cloud can be elongated as it orbits the planet. Credit: NASA/Cornell

Meteoroids pummeling the rings range in size from about a half-inch to several yards (one cm to several meters). When they bash into the icy ring particles they self-destruct, creating clouds of dust and ice in the process. The material is then sorted according to its distance from the planet – closer debris orbits more quickly, material further out more slowly. Soon the dust cloud gets stretched into an elongated bright streak that Cassini can photograph as it looks down (or up) onto the ring plane.

Detail of a debris cloud from a meteoroid strike in Saturn’s C-ring in 2012. Credit: NASA/JPL-Caltech/Space Science Institute/Cornell

“These new results imply the current-day impact rates for small particles at Saturn are about the same as those at Earth — two very different neighborhoods in our solar system — and this is exciting to see,” said Linda Spilker, Cassini project scientist at NASA’s Jet Propulsion Laboratory in Pasadena, Calif.

It’s fascinating to realize that the sight of a meteor in Earth’s starry skies finds its counterpart among the icy boulders of Saturn’s rings nearly a billion miles afield.

 

Update on the fireball that exploded over Russia

The largest ~ 1 kilogram (2.2 lbs) Chelyabinsk / Chebarkul meteorite found to date alongside many smaller fragments. Credit: Screenshot from video, courtesy press-service Ural Federal University

The sun rose twice over the Ural Mountains in Russia Friday February 15. No one expected the second sun, a meteoroid that slammed into the atmosphere so fast it set the air aglow with a fire even brighter than the real sun. It lasted more than 30 seconds before exploding and sending a shock wave rippling across the city of Chelyabinsk and surrounding countryside.

Thousands of residents of small towns in the area of the fall at and around Lake Chebarkul have been busy hunting for meteorite fragments by looking for holes in the snow cover and then carefully clearing away the white stuff until a little black rock remains. It must sound and look like an Easter egg hunt out there. Some of the locals are cashing in on meteorite fever by offering rides to the big hole in the ice on Chebarkul Lake thought to have been punctured by a meteorite fragment.

Another view of the biggest meteorite fragment. It’s shows regmaglypts or dimples created when high temperatures during entry heat and melt away minerals on the surface. Click to see more images of  meteorites found from the fall. Credit: Screenshot from video, courtesy press-service Ural Federal University

Many of the stones – some real, some obviously fake – are popping up on various auction sites in Russia and elsewhere. A quick check on eBay under “Chelyabinsk meteorite” turned up 29 listings today. How many of those are real? Hard to say.

One meteorite hunter interviewed by a BBC team put it this way: “It’s like hunting or fishing. When you see an animal, your heart starts to beat fast, and when you’re fishing – it’s like pulling the fishing rod and thinking there’s something extraordinary. This is the same – you see a tiny hole, try it, and here it is.”

After more than a week of study, we know a little more about the asteroid that created this shower of stones in large part from information recorded by a network of infrasound sensors operated by the Comprehensive Test Ban Treaty Organization (CTBTO). Their purpose is to monitor nuclear explosions.


Recording of infrasound from the Russian fireball that’s been sped up 135 times so we can hear it. The original file was 25 minutes long!

Infrasound, a very low frequency sound wave that can travel long distances, can only be heard by a few animals including elephants. When a large meteor enters the atmosphere it sends ripples of infrasound across the atmosphere around the planet revealing information about its speed, direction of travel and how much energy it contains.

“The Russian meteor’s infrasound signal was was the strongest ever detected by the CTBTO network. The furthest station to record the sub-audible sound was 9,300 miles away in Antarctica,” according to a NASA press release.

Russian fireball on Feb. 15, 2013 recorded by a dashcam

Here’s what we know based on an analysis by Western Ontario Professor of Physics Peter Brown:

* Size: 56 feet (17 meters) in diameter
* Weight: 11,000 tons (10,000 metric tons)
* Speed: 40,000 mph (64,000 km/hour) and broke apart 12-15 miles above Earth’s surface
* Exploded with the power of 470 kilotons of TNT which is equal to more than 23 1940s-era atomic bombs

We looked at the asteroid’s orbit the other day and discovered it belonged to the Apollo family of Earth-crossing asteroids. When farthest from Earth it used to mingle with its many friends in the asteroid belt. Like the majority of asteroids between Mars and Jupiter it has a rocky composition.

Further thoughts on fireballs, asteroids and coincidence

Fragments said to be from the Russian meteorite fall ring the hole in Chebarkul Lake. Credit: Reuters: Chelyabinsk region Interior Ministry

Asteroid 2012 DA14 has moved on, and the Russians are busy cleaning up the mess from yesterday’s fireball. Hopefully a few people are also busy looking for meteorites from the fall. The only meteorite-maybes I’ve seen photos of are the small, black rocks found around the perimeter of the hole in Chebarkul Lake, west of Chelybinsk.

A Tagish Lake meteorite fragment. Credit: Michael Holly, Creative Services, University of Alberta.

If these are indeed meteorites from the bolide, they remind me of the black, carbonaceous debris dropped by the Tagish Lake fall over the Tagish Lake area in British Columbia on January 18, 2000. Carbonaceous chondrites are fragile, carbon-rich meteorites that easily shatter into dust and small bits during a fall. If that’s what we’re dealing with here, meteorite hunters better get cracking – this type erodes quickly. Divers found no trace of any meteorites in the lake at the bottom of the hole today.

It is odd though that two days have gone by without a single significant fragment found. Meteorites, which develop a black fusion crust on atmospheric entry, would show up beautifully against the snowy Russian landscape. So what gives? How long will see purported Chelyabinsk “meteorites”pop up on eBay before the real item finally shows? Only hours after the fall, the first dubious specimens appeared on the auction site. Not a one of them looks like a fresh fall and some are clearly not meteorites. Buyer beware!

These MET-7 satellite photos clearly show the Russian fireball traveling from east to west. North is at top. Asteroid DA14’s trajectory was south to north or nearly perpendicular to the fireball’s. Click for more information and a short video. Credit and copyright: EUMETSAT

As for the Russian fireball being related in any way to the asteroid flyby, it is not. I’ve been in touch with folks who orbits and it’s becoming even clearer that we’re dealing with two very different asteroids. Not only were their orbits nearly perpendicular to each other from the perspective of the Earth, but it’s not possible for a cloud of DA14 fragments to even reach the city of Chelyabinsk at 55 degrees north latitude in Russia.

Since the fragments would approach Earth from due south nearly parallel to the planet’s axis, if they hit the planet, they’d strike the southern hemisphere. From the fragments’ very-close-to-Earth perspective, Chelyabinsk, Russia is on the far or opposite side of the globe and totally out of sight. Amateur asteroid discoverer Dr. Marco Langbroek uses this analogy and I paraphrase slightly:

“Compare it with a car. A bird flying toward your car will always hit the front of the car – it cannot hit the back of the car. Chelyabinsk at 55 North latitude is “the back of the car” in this comparison, given the approach direction of 2012 DA 14 and any fragments of it.”

We place a lot of faith in coincidence because, well, if you drop a plate, it breaks. The two are related. So if two close meteors or asteroids appear around the same time, many of us make the assumption they’re related too. It totally makes sense to wonder about a connection between the two events, but once the data is in, we need to take another look at our surmise. Speaking of data, we’re still waiting on radar images from the Goldstone antenna. As soon as they’re available, you’ll see them here.

Animation of DA14 made from images taken this morning from New Mexico. Credit: Ernesto Guido and Nick Howes

I’m curious if any of you got to see the asteroid flyby either through binoculars or telescope. If so, we’d love to hear your story. Clouds were cruel here in Duluth, Minn., but I stood at the telescope and waited. And waited. Finally, a few thin openings passed the asteroid’s location just above the bowl of the Little Dipper about 7:15 p.m. (CST). There was just enough time to identify DA14 and watch it scoot north. One minute of joy followed by hours of clouds.

Cosmic debris rains down through the atmosphere nearly every day, accumulating at a rate of 37,000 to 78,000 tons per year. While that may sound like a lot, much of it is dust or passes unseen over the oceans.

At least a half-dozen times a year, however, a fireball burns up over a populated area and drops meteorites. Their fall is pinpointed by careful analysis of the angle of entry based on eyewitness reports, Doppler weather radar, security cameras or even dashboard cams, as we saw in Russia on Friday. Once the word is out, everyone from those closest to the areas of impact to meteorite hunters from across the planet are eager to find a piece of otherworldly treasure. The Chelyabinsk region has been pretty much off-limits to foreigners until recently, so it should be interesting to see who gets in and out without being arrested.

What they’re looking for are leftover fragments from collisions of bodies in the asteroid belt between Mars and Jupiter. Over the eons, Jupiter’s gravity nudges the shattered rocks out of the belt, sending them toward the inner solar system. Millions of years later, those fragments may hurl toward Earth. As the space rocks plummet through the atmosphere, the heat and pressure become so intense that even a fairly large object, say 13 to 50 feet across, will more often than not burst into harmless pieces that fall to the ground as meteorites.


The famous Peekskill fireball of October 9, 1992 that dropped a meteorite that smashed the rear end of a Chevy Malibu

A 13-footer hits our planet about once a year. One the size of Friday’s fall in Russia — about 50 feet across and weighing about 7,000 tons — strikes Earth about once every 50-60 years. The bigger they are, the less frequently they fall but the greater the consequences.

Yesterday’s flyby asteroid 2012 DA14, a rock about 150 feet across, would have caused regional devastation had it struck in one piece. One that size only rings our bell every thousand years. An asteroid of about 0.9 miles across could cause planet-wide devastation and climate change. The good news is such an event happens only once in half a million years.

While most of the 0.9-mile and larger near-Earth asteroids have been discovered, there are something like a million others as big as the one that zoomed by harmlessly yesterday. Sky surveys have ferreted out many of them, but many more remain to be found — before they find us. While there are many great ideas about how we might deflect an asteroid headed toward Earth, there are presently no programs underway to accomplish that goal.

Watch asteroid 2012 DA14 flyby LIVE on the Web

2012 DA14 earlier this morning seen from Australia. The negative or reversed image is a 4-minute time exposure. The fast-moving asteroid created a trail of light during that time. Credit: Dave Herald

After this morning’s Russian fireball, we’re all sitting on the edge of our seats, but the fireball and 2012 DA14 are unrelated asteroid fragments on very different paths. One made a beeline directly to Earth, the other will safely pass 17,150 miles away around 1:24 p.m. (CST) today. The latest estimates on the Russian meteoroid’s size before it broke it up in the atmosphere put it around 50 feet across with a weight upwards of 7,000 tons. Today’s asteroid in contrast is about 150 feet end-to-end and tips the scales at 209,000 tons.

Amateur astronomer Dave Herald of Australia has been busy taking pictures of 2012 DA14 through his telescope overnight. His photograph shows the asteroid as a trail against the starry backdrop as it moved northward during the 4-minute time exposure. Herald will be providing an online feed with his observations and photos for NASA later today.

Simulated image of 2012 DA14 approaching Earth this morning around 9:15 a.m. CST. Antarctica shows up nicely as the asteroid closes in. Click to see the latest image.

If you’d like to hear commentary and see real-time pictures of the flyby (from Dave and others), check out NASA TV’s live stream beginning at 11 a.m. Central Time and continuing through the afternoon. Undoubtedly you’ll learn more about the Russian fireball there, too. When pictures are shown, the asteroid will look exactly like a star, because you’re looking at a small object many thousands of miles away.

A Ustream feed of the flyby from a telescope at NASA’s Marshall Space Flight Center in Huntsville, Ala., will be streamed for three hours starting at 8 p.m. CST this evening when the asteroid is visible in a dark sky over the U.S. You can view the feed and ask researchers questions about the flyby via Twitter HERE.

And don’t forget to take a virtual ride-along with the asteroid available HERE. Images are updated every 2 minutes. Enjoy the show!

Must-see videos of spectacular Friday fireball over Russia


Video of a brilliant fireball over Russia on Feb. 15, 2013 local time

A spectacular fireball exploded over the Russian city of Chelyabinsk more than 900 miles east of Moscow around 9:26 p.m. (CST) Feb. 14 or 9:26 a.m. Feb. 15 local time in Russia this morning.

Frame grab from the video during the early phase as the fireball rapidly brightened

Frame from a few seconds later as the meteor heads toward the horizon

The dashcam videos record one of the most brilliant and amazing fireballs I’ve ever seen. Watch as it becomes nearly as bright as the sun with a strong reflection off the roadway. Loud booms accompanied the spectacle and glass windows were shattered. There are reports of downed power lines and interrupted cell phone service. Some 500 people were treated for injuries, mostly from broken glass sent flying from the shock wave and sonic boom. The roof at a zinc factory in Chelyabinsk may have collapsed from the same.


Video from a different dashcam taken from a different location where the fireball is higher in the sky and approaching at a different angle with an insanely spectacular trail. Click to view.

In the second video, notice how long the smoke trail lasts as the car speeds along in a big hurry to get somewhere. In case you’re wondering, this is not related to the flyby of asteroid 2012 DA14 expected around 1:24 p.m. CST today. One clue is the direction of travel. Had it been “leading” today’s asteroid, the fireball’s path would have been almost directly south to north. Instead it traveled from northeast to southwest.

But they do have one thing in common. Even though one will miss Earth and the other’s trajectory took it straight into our atmosphere, both are small asteroids almost certainly originating from the asteroid belt between Mars and Jupiter.

A hole in Chebarkul Lake, west of Chelybinsk, made by meteorite debris. Small fragments of black rocks were found around the crater. Two other impact sites are reported. Click for more photos and further story. Photo by Chebarkul town head Andrey Orlov.


Great video of the smoke trail also called a meteor train 

In this photo provided by Chelyabinsk.ru, a meteorite contrail is seen over Chelyabinsk on Friday, Feb. 15, 2013. The meteor, which streaked across Russia’s Ural Mts. Friday morning, was the largest reported fireball since the 1908 Tunguska explosion. Credit: AP Photo/Chelyabinsk.ru

The latest estimate of size for the original meteoroid – the name given to the object while still in space before entry into Earth’s atmosphere – is about 50 feet across with an approximate weight of 7,000 tones. The Russian Academy of Sciences released a statement saying the meteor traveled at 33,000 mph and shattered about 18-32 miles above the  ground. Three impact sites are now reported including one that fell through the ice in Chebarkul Lake. Dark, rocky meteorites have also been found.


Short video showing dramatic effect of the shockwave

I’ll be updating this blog with more information and photos throughout the day.

More videos HERE.

Bundle up for tonight’s Quadrantid meteor shower; K5 comet update

The Quadrantid radiant, or point in the sky from the meteor shower originates is found below the handle of the Big Dipper. I’ve shown the sky looking northeast around 2 a.m. Later that morning, the radiant will be high in the northern sky. Created with Stellarium

Yes Bobby, there is life after the Geminids. Last month’s meteor shower was arguably the best of 2012, but more are on the way. We start the year with a shower that originates from one of astronomy’s extinct constellation, Quadrans Muralis.

Although defunct, the group of dim stars was around long enough in the late 1700s to lend its name to the Quadrantid meteor shower.

The Quadrantids are reliable but forever a tease. Unlike most showers, which typically toss meteors our way up to several days before and after maximum, the Quads’ activity is limited to a span of 6 hours centered on the peak. That peak can bring a blast of up to 100 meteors per hour, but after that, the show’s pretty much over.

Quadrantid meteor on Jan. 4, 2011. Details: ISO 400, 30-second exposure and 8mm fisheye lens. Credit: John Chumack

This year’s maximum occurs at 13:00 Greenwich time or 7 a.m. CST tomorrow morning Jan. 3 for the Midwest. That’s well into morning twilight for the eastern half of the U.S. but still close enough to peak to make the shower worth watching.

Observers living in the western U.S. and across Hawaii and east Asia are favored because their skies will be dark for a longer time centered around the expected time of maximum.

No matter where you are, light from the waning gibbous moon will compromise meteor counts.

To watch the Quadrantids, set your alarm for tomorrow morning between 2 and 6 a.m. and face east or north away from the bright moon. Your eyes will adapt better to the darkness in those directions, letting you see more (and fainter) meteors. For mainland U.S. observers, the closer to dawn you’re out the better. I plan on rising about 5 should the sky clear.

Peter Jenniskens, senior research scientist at NASA’s SETI Institute, traces the Quads origin to the asteroid 2003EH1, a likely extinct comet. So yes, tomorrow morning we’ll be watching the remains of an extinct comet radiate from an extinct constellation. What could be more apropos?

Comet C/2012 K5 Monday evening Dec. 31, 2012 from Austria. Compare its appearance to the photo taken below in mid-December. The comet’s tail points northeast. Credit: Michael Jaeger

Did someone say comets? Rarely have I seen a comet’s appearance change so rapidly. C/2012 K5, the comet we visited in a blog three days ago, went from compact and bright to big and foggy in just a week. On Christmas morning, C/2012 K5 sported a small, bright head and a striking tail pointing northwest. Two nights ago I was in for a shock when I observed it again. The head had swelled into a big, hazy bulb with a bright, star-like center followed by a wide, much fainter, tube-like tail angled northeast.

There are at least two reasons for these radical changes – the comet was closer by a few million miles – 27 million on Monday night vs. 30 million on the 25th – and our viewing perspective is changing rapidly as C/2012 K5 dives through the plane of the solar system on about Jan. 6.

C/2012 K5 on Dec. 16, 2012 shows a small head and well-defined bright tail pointing northwest. Credit: Michael Jaeger

The comet follows a steeply inclined orbit, looping high above and plunging deep below the plane of the planets and sun. During the first half of December  skywatchers looked up above the Earth and solar system plane to see it. As C/2012 K5 plunges southward, we’re now seeing the comet more from the side.

Since a comet’s tail always points away from the sun, these changing perspectives – a combination of both the comet’s and Earth’s orbital motions – will continue to alter the tail’s direction and appearance in the coming weeks.

C/2012 K5 orbit is steeply inclined to the plane of the solar system, which is why it’s been visible in the far northern sky of late. Now the comet’s rapidly moving southward as it plunges through the plane. Credit: NASA/JPL

Despite the changes, C/2012 K5 remains bright enough to see easily in 8×40 binoculars from a dark sky. It’s a speedy beast too, leaping along at the rate of about 4 degrees per day or 1/3 the moon’s diameter per hour. When the bright core or nucleus happened to pass near a star Monday night, I could see it move in just 15 seconds at 64x in my scope.

Comets and meteor showers keep an amateur astronomer’s life interesting.