Asteroid Blindsides Scientists, Narrowly Misses Earth

An asteroid very narrowly missed the Earth last Thursday, and the scientists apparently had no clue about its approach. The large asteroid, about 100 metres in diameter, was nicknamed ‘city-killer’ due to the potential threat it posed.

By TWC 7-30-19

According to reports, the rock, named Asteroid 2019 OK, passed within 73,000 kilometres of our planet—that’s one-fifth of the distance between the Earth and the moon!

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Oumuamua: Interstellar rock or sun-powered alien UFO?

As a mysterious flying object exits our solar system,
we asked experts to speculate on its origins

Last year, astronomers spotted an unusual interstellar object moving through the solar system at the breezy pace of 26 km per second. [...]

By Sarah Niedoba www.macleans.ca 12-28-18

This month, a pair of Harvard scientists published a paper suggesting that the object might be an abandoned alien spacecraft pushed forward by a “solar sail”—a device using energy from the sun to propel the vessel through space. In January 2019, it will travel beyond Saturn’s orbit on its way out of our solar system. In the interest of scientific rigour, Maclean’s has rounded up the hottest takes from Canada’s leading experts on what they believe ‘Oumuamua might be.

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A mysterious cigar-shaped object spotted tumbling through our solar system last year may have been an alien spacecraft sent to investigate Earth, astronomers from Harvard University have suggested.

By CNN 11-6-18

The object, nicknamed 'Oumuamua, meaning "a messenger that reaches out from the distant past" in Hawaiian, was first discovered in October 2017 by the Pan-STARRS 1 telescope in Hawaii.

Since its discovery, scientists have been at odds to explain its unusual features and precise origins, with researchers first calling it a comet and then an asteroid, before finally deeming it the first of its kind: a new class of "interstellar objects."

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Is the Interstellar Space Object Emitting Radio Signals?

It’s a long shot, but scientists are about to listen very closely for radio signals from our solar system’s first known interstellar visitor

Ever since its discovery in mid-October as it passed by Earth already outbound from our solar system, the mysterious object dubbed ‘Oumuamua (Hawaiian for “first messenger”) has left scientists utterly perplexed. Zooming down almost perpendicularly

By Lee Billings Scientific American 12-11-17

inside Mercury’s orbit at tens of thousands of kilometers per hour—too fast for our star’s gravity to catch—‘Oumuamua appeared to have been dropped in on our solar system from some great interstellar height, picking up even more speed on a slingshot-like loop around the sun before soaring away for parts unknown. It is now already halfway to Jupiter, too far for a rendezvous mission and rapidly fading from the view of Earth’s most powerful telescopes. ... this Wednesday at 3 p.m. Eastern time, the Breakthrough Listen project will aim the West Virgina-based 100-meter Green Bank Telescope at ‘Oumuamua for 10 hours of observations in a wide range of radio frequencies, scanning the object across its entire rotation in search of any signals. Breakthrough Listen is part of billionaire Yuri Milner’s Breakthrough Initiatives program, a collection of lavishly-funded efforts aiming to uncover evidence of life elsewhere in the universe. Other projects include Breakthrough Starshot, which intends to develop and launch interstellar probes, as well as Breakthrough Watch, which would use large telescopes to study exoplanets for signs of life.

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If ‘Oumuamua is in fact artificial, the reasoning goes, it might be transmitting or at least leaking radio waves.

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New data reveal that the interstellar asteroid that recently zipped through our solar system is rocky, cigar-shaped, and has a somewhat reddish hue. It’s the first confirmed object from another star observed in our solar system, and was discovered Oct. 19 by the University of

NASA 11-24-17

Hawaii’s Pan-STARRS1 telescope team, funded by NASA’s Near-Earth Object Observations Program. The telescope team named it ‘Oumuamua (oh MOO-uh MOO-uh) – Hawaiian for “a messenger from afar arriving first.” The unusually-shaped asteroid, which is up to a quarter mile long and perhaps 10 times as long as it is wide, may provide new clues into how other solar systems formed.

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Asteroid Approaching!

An asteroid the size of a house is set to give Earth a close shave, and you can watch part of the space rock's approach live online this evening (Oct. 11).

By Mike Wall Space.com 10-11-17

The astronomy broadcasting service Slooh will air a webcast at 8 p.m. EDT tonight (0000 GMT on Oct. 12) focused on the space rock 2012 TC4, which will zoom by Earth just a few hours later. You can watch the show directly on Slooh's website. You can also watch the webcast on Space.com, courtesy of Slooh.

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Huge Asteroid 'Florence' Zooms Past Earth in Record-Breaking Flyby | VIDEO

A mountain-size space rock cruised past Earth this morning (Sept. 1) in a record-breaking encounter that has long had scientists drooling.

At 8:06 a.m. EDT (1206 GMT) today, the roughly 2.7-mile-wide (4.4 kilometers) asteroid 3122 Florence came within a mere 4.4 million miles (7 million km) of Earth — just 18 times the distance from our planet to the moon.

By Mike Wall Space.com 9-1-17

"Nothing this big has passed this close to Earth since we've been tracking," Paul Chodas, manager of the Center for Near-Earth Object Studies at NASA's Jet Propulsion Laboratory in Pasadena, California, told Space.com. "This is a once-in-40-year-event kind of thing."

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Massive Asteroid To Buzz By Earth Today (4-19-17) | VIDEO

The Earth will have a close encounter Wednesday with a massive asteroid nicknamed "The Rock." NASA first learned about it three years ago, and it is the largest to pass by Earth since 2004. CBS News science and futurist contributor Michio Kaku joins "CBS This Morning"

By CBS This Morning 4-19-17

to discuss how the asteroid will not affect Earth, although it does show the dangers of nearby objects.

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A bus-size asteroid that buzzed between the Earth and the moon at 3:25 p.m. EST (2025 GMT) on Thursday (Feb. 2) was spotted by one of the Slooh Community Observatory telescopes in the Canary Islands.

By Calla Cofield space.com 2-4-17

The asteroid, dubbed 2017 BS32, was first identified by the Panoramic Survey Telescope & Rapid Response System, or Pan-STARRS, on Jan. 30, and came to within half the distance between the Earth and the moon on Feb. 2, according to Slooh. The space rock is between 36 and 82 feet long (11 to 25 meters), and was traveling at a speed of 25,800 mph (42,000 km/h), or about 16 times faster than a bullet shot out of an AK-47 rifle, according to Slooh astronomer Erik Edelman.

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Earth's Close Shave with Comet Recorded on Radar and Infrared | VIDEO

Astronomers were watching when comet P/2016 BA14 flew past Earth on March 22. At the time of its closest approach, the comet was about 2.2 million miles (3.5 million kilometers) away, making it the third closest comet flyby in recorded history (see "A 'Tail' of Two Comets"). Radar images from the flyby indicate that the comet is about 3,000 feet (1 kilometer) in diameter.

By NASA 3-24-16

The scientists used the Goldstone Solar System Radar in California's Mojave Desert to track the comet. "We were able to obtain very detailed radar images of the comet nucleus over three nights around the time of closest approach," said Shantanu Naidu, a postdoctoral researcher at NASA's Jet Propulsion Laboratory in Pasadena, California, who works with the radar team and led the observations during the comet's flyby. "We can see surface features as small as 8 meters per pixel.

"The radar images show that the comet has an irregular shape: looks like a brick on one side and a pear on the other," Naidu said. "We can see quite a few signatures related to topographic features such as large flat regions, small concavities and ridges on the surface of the nucleus. "

According to the new radar observations, comet P/2016 BA14 appears to spin around its axis once every 35 to 40 hours.

Vishnu Reddy, of the Planetary Science Institute, Tucson, Arizona, also observed comet P/2016 BA14 using the NASA Infrared Telescope Facility (IRTF) on Mauna Kea, Hawaii. Data collected (infrared spectra) indicate that the comet reflects less than 3 percent of the sunlight that falls on its surface. Comet nuclei are as dark as fresh asphalt. However, infrared spectra can often yield clues to the makeup of these primitive denizens of the solar system. [...]

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Radar data of asteroid 1999 JD6 revealed the object is a contact binary consisting of two lobes. The data was collected over seven and a half hours on July 25, 2015, when the asteroid was about 4.5 million miles (7.2 million kilometers) from Earth.

By NASA
7-31-15

     NASA scientists have used two giant, Earth-based radio telescopes to bounce radar signals off a passing asteroid and produce images of the peanut-shaped body as it approached close to Earth this past weekend.

The asteroid appears to be a contact binary -- an asteroid with two lobes that are stuck together.

The images show the rotation of the asteroid, named 1999 JD6, which made its closest approach on July 24 at 9:55 p.m. PDT (12:55 a.m. EDT on July 25) at a distance of about 4.5 million miles (7.2 million kilometers, or about 19 times the distance from Earth to the moon).

"Radar imaging has shown that about 15 percent of near-Earth asteroids larger than 600 feet [about 180 meters], including 1999 JD6, have this sort of lobed, peanut shape," said Lance Benner of NASA's Jet Propulsion Laboratory in Pasadena, California, who leads NASA's asteroid radar research program.

To obtain the views, researchers paired NASA's 230-foot-wide (70-meter) Deep Space Network antenna at Goldstone, California, with the 330-foot (100-meter) National Science Foundation Green Bank Telescope in West Virginia. Using this approach, the Goldstone antenna beams a radar signal at an asteroid and Green Bank receives the reflections. The technique, referred to as a bistatic observation, dramatically improves the amount of detail that can be seen in radar images. The new views obtained with the technique show features as small as about 25 feet (7.5 meters) wide.

The individual images used in the movie were generated from data collected on July 25. They show the asteroid is highly elongated, with a length of approximately 1.2 miles (2 kilometers) on its long axis. The movie spans a period of about seven hours, 40 minutes.

This week's flyby was the closest approach the asteroid will make to Earth for about the next 40 years. The next time it will approach Earth this closely is in 2054, at approximately the same distance of this week's flyby.

Data from the new observations will be particularly useful to Sean Marshall, a graduate student at Cornell University in Ithaca, New York, whose doctoral research on 1999 JD6 is funded by NASA's Near-Earth Object Program. "I'm interested in this particular asteroid because estimates of its size from previous observations, at infrared wavelengths, have not agreed. The radar data will allow us to conclusively resolve the mystery of its size to better understand this interesting little world," he said.

Despite the uncertainty about its size, asteroid 1999 JD6 has been studied extensively and many of its physical properties, as well as its trajectory, are well known. It rotates in just over seven-and-a-half hours and is thought to be a relatively dark object. Asteroid 1999 JD6 was discovered on May 12, 1999, by the Lowell Observatory Near-Earth-Object Search, located in Flagstaff, Arizona.

Radar is a powerful technique for studying an asteroid's size, shape, rotation, surface features and surface roughness, and for improving the calculation of asteroid orbits. Radar measurements of asteroid distances and velocities often enable computation of asteroid orbits much further into the future than would be possible otherwise.

NASA places a high priority on tracking asteroids and protecting our home planet from them. In fact, the U.S. has the most robust and productive survey and detection program for discovering near-Earth objects (NEOs). To date, U.S. assets have discovered over 98 percent of the known NEOs.

In addition to the resources NASA puts into understanding asteroids, it also partners with other U.S. government agencies, university-based astronomers, and space science institutes across the country, often with grants, interagency transfers and other contracts from NASA, and also with international space agencies and institutions that are working to track and better understand these objects.

NASA's Near-Earth Object Program at NASA Headquarters, Washington, manages and funds the search, study and monitoring of asteroids and comets whose orbits periodically bring them close to Earth. JPL manages the Near-Earth Object Program Office for NASA's Science Mission Directorate in Washington. JPL is a division of the California Institute of Technology in Pasadena. . . .

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Record Size Asteroid Flies by Earth Today (1-26-15) – Watch It Live

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By Shannon Hall
www.space.com
1-26-15

      A huge asteroid will become the largest space rock of its kind to pass closest to Earth until 2027 today (Jan. 26) when it zooms safely by Earth beyond the orbit of the moon, and you can see the space rock's flyby live online.

The mountain-size asteroid 2004 BL86 will star in a live webcast at 11 a.m. EST (1600 GMT) by the online Slooh observatory and may even be visible to observers with binoculars or a small telescope because of its significant size – about a third of a mile wide. At its closest approach, the asteroid will be about 745,000 miles (1.2 million kilometers) from Earth and poses no danger of hitting our planet, according to NASA scientists.

The Slooh webcast will be available free on Slooh.com at and feature live commentary from NASA near-Earth object expert Paul Chodas and NASA research scientist Lance Benner, and be hosted by Will Gater and Slooh astronomer Bob Berman. You can also watch the asteroid 2004 BL86 flyby on Space.com, courtesy of Slooh. . . .

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By space.com
1-14-15

     On Jan. 26th, 2015, Asteroid 2004 BL86 will become the largest known space rock to fly this close to Earth (nearest approach = ~745,000 miles). Unless another asteroid of its size or bigger is discovered, it will hold the record until 2027, when asteroid 1999 AN10 makes a close approach. . . .

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By Amanda Barnett
CNN
9-5-14

     (CNN) -- A newly discovered asteroid will pass "very close" to Earth on Sunday, NASA says.

The space rock is estimated to be 60 feet (18 meters) long. It's expected to fly over New Zealand about 2:18 p.m. EDT (11:18 a.m. PDT / 18:18 UTC.)

It won't hit Earth or any of the thousands of satellites orbiting the planet, NASA says. It will give astronomers and scientists a chance to study it.

The asteroid won't be visible the naked eye, but amateur astronomers should be able to see it with telescopes.

Called 2014 RC, the asteroid was discovered on August 31 by the Catalina Sky Survey near Tucson, Arizona.

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By space.com
12-30-13

    The space rock was discovered on Dec. 23rd, 2013 and will be makes its closest approach to Earth (3.6 lunar distance) on Jan. 3rd, 2014. Its is estimated to be 102 meters or 400 feet-wide.

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Giant Asteroid to Sail Past Earth Today: Watch it Live!

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By Mike Wall
SPACE.com
5-31-13

      A huge asteroid is set to cruise by Earth Friday afternoon (May 31), making its closest approach to our planet for at least the next two centuries.

Asteroid 1998 QE2 will come within 3.6 million miles (5.8 million kilometers) of Earth at 4:59 p.m. EDT (2059 GMT) Friday — about 15 times the distance from our planet to the moon.

There's no chance the 1.7-mile-wide (2.7 km) 1998 QE2 will hit us, researchers say. That's a good thing, because a strike by such a big space rock would cause catastrophic damage, potentially wiping out our species.

In general, scientists think any asteroid bigger than 0.6 miles, or 1 km, could end human civilization if it hit us. For comparison, the object that killed off the dinosaurs 65 million years ago is thought to have been about 6 miles (10 km) wide.

Asteroid 1998 QE2 won't put on a show for skywatchers. At its closest pass, the space rock will still be 100 times fainter than the dimmest star visible to naked-eye observers under clear and dark skies, experts say.

But several different organizations, including the Slooh Space Telescope and the Virtual Telescope Project, will broadcast live views of the near-Earth asteroid's close approach from professional-quality observatories around the world. You can watch their 1998 QE2 webcasts starting at 4:30 p.m. EDT (2030 GMT) (See link below):

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WATCH LIVE @ 4:30: Asteroid 1998 QE2 Flyby


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Asteroid Toutatis Slowly Tumbles by Earth

By DC Agle
NASA
12-14-12

     Scientists working with NASA's 230-foot-wide (70-meter) Deep Space Network antenna at Goldstone, Calif., have generated a series of radar data images of a three-mile-long (4.8-kilometer) asteroid that made its closest approach to Earth on Dec. 12, 2012. The radar data images of asteroid Toutatis have been assembled into a short movie (above).

The images that make up the movie clip were generated with data taken on Dec. 12 and 13, 2012. On Dec. 12, the day of its closest approach to Earth, Toutatis was about 18 lunar distances, 4.3 million miles (6.9 million kilometers) from Earth. On Dec. 13, the asteroid was about 4.4 million miles (7 million kilometers), or about 18.2 lunar distances.

The radar data images of asteroid Toutatis indicate that it is an elongated, irregularly shaped object with ridges and perhaps craters. Along with shape detail, scientists are also seeing some interesting bright glints that could be surface boulders. Toutatis has a very slow, tumbling rotational state. The asteroid rotates about its long axis every 5.4 days and precesses (changes the orientation of its rotational axis) like a wobbling, badly thrown football, every 7.4 days.

The orbit of Toutatis is well understood. The next time Toutatis will approach at least this close to Earth is in November of 2069, when the asteroid will safely fly by at about 7.7 lunar distances, or 1.8 million miles (3 million kilometers). An analysis indicates there is zero possibility of an Earth impact over the entire interval over which its motion can be accurately computed, which is about the next four centuries.

This radar data imagery will help scientists improve their understanding of the asteroid's spin state, which will also help them understand its interior.

The resolution in the image frames is 12 feet (3.75 meters) per pixel. NASA detects, tracks and characterizes asteroids and comets passing close to Earth using both ground- and space-based telescopes. The Near-Earth Object Observations Program, commonly called "Spaceguard," discovers these objects, characterizes a subset of them, and plots their orbits to determine if any could be potentially hazardous to our planet.

JPL manages the Near-Earth Object Program Office for NASA's Science Mission Directorate in Washington. JPL is a division of the California Institute of Technology in Pasadena.

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By Keerthi Chandrashekar
12-11-12

     Doomsday fetishists rejoice. It seems that a giant asteroid will be passing relatively close to Earth on the night of Tuesday, Dec. 11. The asteroid is expected to come as close as 4.3-million miles from our planet Earth.

The 3-mile wide asteroid is roughly half the size of the asteroid believed to have killed off the dinosaurs and is shaped like a peanut. Named 4179 Toutatis, the asteroid is currently listed as a potentially hazardous space object, whose collision with Earth would have dramatic consequences.

Don't worry though, at 4.3-million miles, Toutatis will be 18 times the distance between the Earth and the moon (lunar distances), and scientists agree the chances of a collision are incredibly slim. The only long-term issue is that Toutatis operates on a slightly chaotic orbit, making it difficult to predict the distant future.

The Slooh Space Camera held a live stream of the asteroid's passing.

"We will be tracking Asteroid Toutatis live from two observatory locations - Canary Islands, off the coast of Africa and Arizona," president of Slooh Patrick Paolucci said. . . .

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By Mike Wall
SPACE.com
6-14-12

     A newly discovered asteroid the size of a city block cruised past Earth well beyond the orbit of the moon Thursday night (June 14), providing a rare treat for scientists and telescope-equipped observers.

The 1,650-foot-wide (500-meter) near-Earth asteroid 2012 LZ1 came within 3.3 million miles (5.3 million kilometers) of our planet during its closest approach at 8 p.m. EDT Thursday (0000 GMT Friday). . . .

. . . More


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