Surprise Asteroid Passes Earth in Close Flyby
Discovered two days ago (likely due to its small size). Reports BBC News:
The asteroid, estimated to be about 11 m (36 ft) in diameter, was first detected on Wednesday. At its closest, the space rock — named 2012 BX34 — passed within about 60,000 km of Earth — less than a fifth of the distance to the Moon. Astronomers stressed that there had been no cause for concern. “It’s one of the closest approaches recorded,” said Gareth Williams, associate director of the US-based Minor Planet Center.
“It makes it in to the top 20 closest approaches, but it’s sufficiently far away …” he told the BBC. The asteroid’s path made it the closest space-rock to pass by the Earth since object 2011 MD in June 2011.
Here’s more from Space.com:
Earth Always Has Two Moons
A group of Cornell astrophysicists say that at any given time, Earth always has a very small second moon orbiting. That’s the moon I like most. Phenomenica writes:
The Earth has always had a temporary second moon, new study has claimed. When astronomers caught sight of a mysterious titanium white object circling around the Earth in 2006, they assumed it was a spent rocket. But it was actually a small asteroid captured by the Earth’s gravitational field that rotated around the Earth until June 2007.
In the new study, astrophysicists at Cornell claim that this little moon was not an anomaly as these asteroids come and go so often it means our planet always has a temporary second moon.
According to Cornell University’s Mikael Granvik, Jeremie Vaubaillon and Robert Jedicke, they have calculated the population of “irregular natural satellites that are temporarily captured” by Earth.
In their study, researchers say that while these moons are…
Earth (Usually) Has Two Moons
So reports MIT’s Technology Review:
Back in 2006, the Catalina Sky Survey in Arizona noticed that a mysterious body had begun orbiting the Earth. This object had a spectrum that was remarkably similar to the titanium white paint used on Saturn V rocket stages and, indeed, a number of rocket stages are known to orbit the Sun close to Earth.
But this was not an object of ours. Instead, 2006 RH120, as it became known, turned out to be a tiny asteroid just a few metres across–a natural satellite like the Moon. It was captured by Earth’s gravity in September 2006 and orbited us until June 2007 when it wandered off into the Solar System in search of a more interesting neighbour.
2006 RH120 was the first reliably documented example of a temporary moon …
Large Asteroid 2005 YU55 to Pass Earth — Closer Than Moon
Edward Lovett and Ned Potter Report on ABC News:
We have a visitor — a large asteroid called 2005 YU55 that is expected to come within approximately 201,700 miles of Earth on Tuesday, according to NASA. That’s slightly less than the distance from Earth to the moon.
Asteroids often pass this close, but most are tiny. Countless thousands of pieces come plunging into the atmosphere, but they burn up without doing any harm. If they’re as large as grains of sand, we may, if we’re lucky, see them in the night sky as shooting stars.
But 2005 YU55 is at least 1,300 feet wide — larger than an aircraft carrier, according to radar measurements. The last time an asteroid this big passed by was in 1976, and the next one scientists know of won’t be until 2028, NASA says. (There have been some rude surprises in between, but not involving anything remotely as…
Planet Earth Has A Stalker
Michael Reilly reports in the New Scientist:
An asteroid 300 metres in diameter is stalking the Earth. Hiding in the pre-dawn twilight, it has marched in lockstep with our planet for years, all but invisible to our telescopes.
The rock is Earth’s first confirmed Trojan, which can orbit the sun in either of two gravitational wells along the same orbital path as our planet. From the sun’s point of view, these wells lie 60 degrees ahead of and behind the Earth, at Lagrange points where gravitational forces between the sun and the Earth balance out.
Trojans are common — Jupiter alone boasts about 5000, and Neptune and Mars each have their own smaller collections. But finding Earth’s has proven difficult, because the Lagrange points lie towards the sun in the sky. Astronomers must look for the objects just before the sun rises or after it sets, and until now the glare of this…
The Search For Alien Space Miners
Ray Villard writes on Discovery News:
Rather than looking for aliens who use interstellar radio signals to say “hi,” an alternative search strategy is simply to spy on any mega-engineering projects that an advanced civilization might be undertaking. Veteran SETI astronomer Jill Tarter calls this strategy “SETT” — the Search for Extraterrestrial Technology.
A new science paper by Duncan Forgan at the University of Edinburgh in Scotland and Martin Elvis at the Harvard-Smithsonian Center for Astrophysics in Cambridge, Mass., suggests we look for evidence of a very ambitious macro-engineering project: the wholesale mining of an asteroid belt. The asteroid material may be mined to build space colonies, solar power satellites or maybe even an entire “ringworld,” as imagined by sci-fi writer Larry Niven.
What’s more, precious metals are in high demand for technologies such as computers, high-speed networks and mobile phones. So-called “green technologies” of the future, such as hydrogen fuel cells, will…
Early Warning System For Asteroid Attack
One of the more credible of the various 2012 “end is nigh” scares is the prospect of a massive “Near Earth Object” (NEO), most likely a meteor or asteroid, smashing through the Earth’s atmosphere, causing damage locally on impact and potentially causing such great meteorological disruption that our way of life is changed forever, possibly to an extinction level. Frighteningly there is usually hardly any warning that they are coming. MIT’s Technology Review reports on an astronomer’s plans for a network of telescopes that could give up to three weeks’ warning of a city-destroying impact, on its Physics arXiv Blog:
At about 3am on 8 October last year, an asteroid the size of a small house smashed into the Earth’s atmosphere over an isolated part of Indonesia. The asteroid disintegrated in the atmosphere causing a 50 kiloton explosion, about four times the size of the atomic bomb used to destroy Hiroshima. The…
When Asteroids Collide
One of the most likely ‘Earth Apocalypse’ scenarios among the many bandied about by 2012 alarmists is that a “Near Earth Object” — as asteroids, meteors and other space junk that might collide with us are known in the trade — might smash through our atmosphere and impact with our planet. The Hubble Telescope has recorded a taste of what that might mean, reported in the Register:
The Hubble Space Telescope has captured the aftermath of just what happens when two asteroids collide at 11,000 mph (17,702 km/h), prompting an explosion “as powerful as the detonation of a small atomic bomb”.
P/2010 A2. Photo: NASA
The result is a “peculiar” object – dubbed P/2010 A2 – which boasts a comet-like debris trail behind a mysterious X-shaped formation.
The asteroid belt pile-up happened in early 2009, according to NASA, but it wasn’t until January this year that the Lincoln Near-Earth Research (LINEAR) Program Sky Survey…
Two Asteroids Perilously Close To Earth
NASA/JPL plot of asteroids' paths
These ones probably won’t hit, but they show that so-called Near Earth Objects could collide with our planet at any time with precious little warning. From ABC News:
Today is not a good day for the anxious among us. Two small asteroids — two in twelve hours — are passing the earth, both coming within the moon’s orbit, one of them whipping by about 49,000 miles away.
In a spirit of calm, we ought to point out that NASA says close calls like these happen, on average, almost daily. The difference is that usually we never know. These two objects were both spotted Sunday by the Catalina Sky Survey at the University of Arizona.
The specifics:
–Asteroid 2010 RX30 is estimated to be 32 to 65 feet in size (10-20 meters) and passed within 154,000 miles of Earth at 5:51 a.m. EDT this morning. (The moon, by comparison, is 2,200…
Very Early Warning: 1-in-1,000 Chance of Asteroid Impact in 2182
Ian O’Neill writes on Discovery News:
This isn’t an urgent call to arms, but it’s certainly a future date to consider. In the year 2182 — 172 years time — there’s the possibility that we might be hit by an asteroid with potential to cause some significant global turmoil.
This long-distance forecast could help mankind determine whether asteroid deflection techniques are warranted, especially when given nearly two centuries of lead time.
The not-so-romantically named (101955) 1999 RQ36 — discovered in 1999 — measures approximately 510 meters in diameter and is classified as an Apollo asteroid. Apollo asteroids pose a threat to our planet as they routinely cross Earth’s orbit.
With a one-in-a-thousand chance of 1999 RQ36 hitting Earth — with half of this probability indicating a 2182 impact — the threat might not sound too acute.
But compare this with the panic that ensued with the discovery of 99942 Apophis in 2004. Initially, it was…
Dark Asteroids Found Lurking Near Earth
A near-Earth object becomes visible in infrared (Image: NASA/JPL-Caltech/UCLA)
David Shiga writes on New Scientist:
An infrared space telescope has spotted several very dark asteroids that have been lurking unseen near Earth’s orbit. Their obscurity and tilted orbits have kept them hidden from surveys designed to detect things that might hit our planet.
Called the Wide-Field Infrared Survey Explorer (WISE), the new NASA telescope launched on 14 December on a mission to map the entire sky at infrared wavelengths. It began its survey in mid-January.
In its first six weeks of observations, it has discovered 16 previously unknown asteroids with orbits close to Earth’s. Of these, 55 per cent reflect less than one-tenth of the sunlight that falls on them, which makes them difficult to spot with visible-light telescopes. One of these objects is as dark as fresh asphalt, reflecting less than 5 per cent of the light it receives.
Many of these dark asteroids have orbits…
‘Object X’ Likely Related to Prehistoric Dinosaur-Killing Asteroid
David Perlman writes in the SF Chronicle:
A puzzling object that seemed to be a comet flying inside the solar system’s asteroid belt is no comet at all, but the remains of a violent collision between two fossil rocks that populate the belt, astronomers say.
Captured in images by the Hubble Space Telescope, the crash of the asteroids provides scientists with their first opportunity to see clear evidence of the violent activity that has constantly churned the asteroid belt since its formation, probably when the planets themselves were forming about 4.5 billion years ago.
The object was first sighted in early January by astronomers at the Air Force LINEAR project telescope in New Mexico, who reported it as a comet that must have flown into the asteroid belt from the solar system’s outer reaches, as all comets do. It was the fifth presumed comet to be reported in the unlikely region, they said,…
Hubble Detects Mysterious Spaceship-Shaped Object Traveling at 11,000 MPH
Jesus Diaz writes a very thought-provoking article on Gizmodo:
Hubble has discovered a mysterious X-shaped object traveling at 11,000mph. NASA says that P/2010-A2 may be a comet, product of the collision between two asteroids. Or a Klingon Bird of Prey. Either way, UCLA investigator David Jewitt is excited:
This is quite different from the smooth dust envelopes of normal comets. The filaments are made of dust and gravel, presumably recently thrown out of the nucleus. Some are swept back by radiation pressure from sunlight to create straight dust streaks. Embedded in the filaments are co-moving blobs of dust that likely originated from tiny unseen parent bodies.
OK, David, we will believe you until Jerry Bruckheimer finish his next movie, in which a “comet” suddenly stops, turns to Earth, and starts firing anti-matter rays against our underpants.
The weirdest thing, however, is not only the prettyful X-shaped debris pattern, but the fact that its 460-foot-wide…
Russia’s Armageddon Plan to Save Earth from Asteroid Collision
More interesting news from Russia to set your mind at ease. Via the Guardian:
Space scientists in Russia are preparing to boldly go where no man has gone before, except for the actor Bruce Willis.
The head of the Russian space agency said today that it was considering a Hollywood-style mission to send a spacecraft to bump a large asteroid from a possible collision course with Earth.
Anatoly Perminov told the Russian radio station Golos Rossii: “People’s lives are at stake. We should pay several hundred million dollars and build a system that would allow us to prevent a collision, rather than sit and wait for it to happen and kill hundreds of thousands of people.”
The mission would be aimed at an asteroid called Apophis, he said, which is expected to pass close to the Earth in 2029 and again in 2036. “Calculations show that it’s possible to create a special-purpose spacecraft within…
Are Earth’s Oceans Made Of Extraterrestrial Material?
From Science Daily:
Contrary to preconceived notions, the atmosphere and the oceans were perhaps not formed from vapors emitted during intense volcanism at the dawning of our planet. Francis Albarède of the Laboratoire des Sciences de la Terre (CNRS / ENS Lyon / Université Claude Bernard) suggests that water was not part of the Earth’s initial inventory but stems from the turbulence caused in the outer Solar System by giant planets. Ice-covered asteroids thus reached the Earth around one hundred million years after the birth of the planets.
The Earth’s water could therefore be extraterrestrial, have arrived late in its accretion history, and its presence could have facilitated plate tectonics even before life appeared. The conclusions of the study carried out by Albarède feature in an article published on the 29 October 2009 in the journal Nature.
Space agencies have got the message: wherever there is life there has to be water. Around…
Asteroid Passes Just 8,700 Miles From Earth – With Only 15 hours Warning
The Daily Mail is reporting on a close shave for all of us here on Earth, scarily close to the opening of Roland Emmerich’s mega-disaster movie 2012. A massive impact on the Earth’s surface by a Near Earth Object (NEO) (albeit one bigger than this asteroid) could bring about the types of disasters that 2012 alarmists are warning of. Alexandra Bruce describes the likelihood of NEO impact on Earth in 2012 in her book, 2012: Science or Superstition; the scariest part is that scientists generally only know about NEOs buzzing Earth after the fact.
Although no one noticed at the time, the Earth was almost hit by an asteroid last Friday.
The previously undiscovered asteroid came within 8,700miles of Earth but astronomers noticed it only 15 hours before it made its closest approach.
Its orbit brought it 30 times nearer than the Moon, which is 250,000 miles away.
But before you head for the nuclear bunkers…
Scientists Close In On Mystery Of Arctic Asteroid Strikes
Alexis Madrigal reports in Wired:
Two polar scientists hot on the trail of an arctic mystery have a new tool for exploration: a hovercraft, specially outfitted for week-long trips over the ice with scientific instruments and solar panels.
Their quarry is a nearly 22,000 square-mile patch of disturbed Arctic sea floor that could be evidence of a massive asteroid strike. John Hall, a now-retired geoscientist, discovered the anomaly during his late-’60s graduate work aboard Fletcher’s Ice Island, a huge berg U.S. scientists inhabited for several decades.
Since then, no scientific vessel has been back over the area to collect more data. The massive icebreakers that have crunched through the Arctic since the 1990s can’t reach the spot, said Yngve Kristofferson, a scientist and explorer at the University of Bergen in Norway.
