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Mon, 25 Jul 2016
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Meteor

Scientists spot strange structures on surface of asteroid as it passes by


An asteroid that is 400m (1,300ft) wide has passed by Earth, much to the delight of astronomers.

Although invisible to the naked eye, scientists said they spotted strange structures on its surface as it spun past at 30,000mph (48 280.32 km/h).

Asteroid 2005 YU55's was the closest an asteroid has been to Earth in 200 years, according to Nasa.

It is also the largest space rock fly-by Earth has seen since 1976; the next visit by a large asteroid will be 2028.

The aircraft-carrier-sized asteroid was darkly coloured in visible wavelengths and nearly spherical, lazily spinning about once every 20 hours as it raced through our neighbourhood of the Solar System.

Comment: The above video is not the BBC's of course, it's taken from this YouTube channel.

We think that image is far too grainy to tell if we're looking at 'a structure' (in the sense that it's 'unnatural').

The narrator does make a good point however about the poor quality images they made available to the public. They can take fabulous photographs of other galaxies, but can't do better than this for "the closest asteroid fly-by in 200 years"?

It could be that by "strange structures", they meant naturally occurring structures they weren't expecting to see, such as the clear signs of electrical arc discharges on comets Wild 2 and Tempel 1 (which completely discounted the 'dirty snowball' theory of comets, by the way).

Then there's this:

Asteroid Vesta Has Mountain Three Times as Tall as Everest

And then, if we put our conspiracy-minded hats on for a minute, it could be that they're deliberately feeding the 'comets and space rocks as UFOs and motherships' disinformation.


Arrow Up

US: Another mystery rumble felt in Hampton Roads, Virginia

Boom, it happened again.

Residents at the Oceanfront reported hearing a strange explosion around 9 p.m. Wednesday that rattled windows, shook foundations and startled babies out of their sleep.

It was the second time this year coastal residents have flooded emergency lines and online social networking sites after hearing and feeling ... well, something.

As with a previous mystery disturbance in May, nobody seems to know what happened, yet theories abound.

It wasn't another earthquake like the one that shook the East Coast in August, according to geologists. A NASA scientist said it could have been caused by a meteor crashing through the atmosphere, but there's no way of knowing without photographic proof. And military officials said don't blame them.

Comment: Sounds like yet another meteor exploding overhead.


Meteor

US: Dalton, Georgia Reacts to 2.7 'Tremor' - 'explosion, came from the air'

A 2.7 magnitude quake rocked the Dalton area just before noon Wednesday. While some people in Dalton were pretty sure the rumble was an earthquake, others were convinced it was something else.


"Chances are it might have been an earthquake, but maybe it was some big monster outside that's coming to get us all," Jonathan Marks jokes about the magnitude 2.7 quake, but he wasn't the only one who was curious about what caused the ground to shake beneath his feet. The US Geological Survey didn't officially deem the shake, a quake until 2 hours after people say they felt the ground rattle and heard a loud boom in the air.

"I thought it was kind of like a huge explosion or a sonic boom because there was a little noise at first and then a loud explosion and I felt it right between my shoulders it was like it came from the air," said Mary Ellen Gurley, an employee at Dalton State College.

Comment: Sounds more like another meteorite exploding in the atmosphere overhead.


Telescope

Colorful Conjunction - Mars and Regulus

The red planet Mars and the blue star Regulus have gathered together in the pre-dawn sky for a close conjunction that will be at its best on the morning of Friday, Nov. 11th. Wake up early, look east, and behold the colors.

Image
© Brendan Alexander
Conjunction of Mars and Regulus

On November 10th, Brendan Alexander from Killygordon, Co. Donegal, Ireland writes:
A Colourful Pair: Perhaps the highlight of the month for casual observers will be provided by the red planet. Mars is putting on a pre-dawn show along with Regulus, the brightest star in the constellation of Leo the Lion. The pair rise in the east from 01:00 onwards and will be at their highest in the south before Sunrise. Regulus is a distinctive blue-white colour, while the planet Mars sports a striking red hue. This coming together gives stargazers an opportunity to compare and contrast the stunning colours these two heavenly bodies display. The colour difference was obvious to the naked eye and binoculars will further enhance my views of the pair. Mars approached Regulus from the west at the start of the month and makes its closest approach to the tomorrow morning (11 November). However, in case cloud interfered, I grabbed the shot this morning as the pair look equally stunning from the 8th to the 14th of November.

Sun

Incoming Coronal Mass Ejection? Full Halo CME blasts off the Sun, impacting Earth Friday or Saturday

Yesterday, Nov. 9th around 1330 UT, a magnetic filament in the vicinity of sunspot complex 1342-1343 erupted, producing a M1-class solar flare and hurling a CME into space. The Solar and Heliospheric Observatory recorded the progress of the expanding plasma cloud:

Image
© SOHO
Although the eruption was not squarely aimed at Earth, the CME is likely to deliver a glancing blow to our planet's magnetic field on Nov. 11th or 12th. This could add to the impact of another CME already en route. The earlier cloud was propelled by a filament eruption (movie) on Nov. 7th and is also expected to deliver a glancing blow on Nov. 11th.

Analyses of these events are still preliminary, and the forecast may change. For now it is safe to say that high-latitude sky watchers should be alert for auroras on Nov. 11-12. SOHO movie.

Meteor

Two fireballs seen over Poland on successive nights, including very bright one observed from Berlin to Czech Republic

Image
© PKiM
Trajectory
On Sunday a record-breaking fireball appeared over Poland. Its visible trail was as long as 254 km, reports the Polish Fireball Network (PFN - PKiM in Polish).

This phenomenon took place on 6 November at 5:38:19 p.m. local time. The fireball flew nearly directly south from the region of Poznan toward the Czech Republic. It reached its maximum brightness over a village of Lukova in the Czech Republic. Average brightness was of -3 magnitude and in outbursts it reached up to -5.5. The meteor appeared at an altitude of 130 km and burnt up at 95 km. Its flight lasted almost 4 seconds.

It was a sporadic meteor of cometary origin and was travelling very fast. Its velocity was up to 65 km/sec.

The phenomenon was registered by the Polish Fireball Network in Chelm, Otwock, Twardogora, Urzedowo and Krakow.

© PKiM
Nov 6, 16:38:19 UT, first report came from Tomasz Krzyzanowski, observatory station Podgorzyn, PFN 38

Meteor

Passing asteroid 2005 YU55 puts on a show

Astronomers watched the asteroid 2005 YU55 spin as it zoomed harmlessly past Earth, and everybody else was looking over their shoulders. You can expect to see a huge pile of pictures now that the coal-dark space rock has passed by.

Even before the closest pass, NASA's Jet Propulsion Laboratory provided a six-frame "movie" based on radar data acquired by the Goldstone radio telescope on Monday. This sequence was captured from a distance of 860,000 miles (1.38 million kilometers).


Meteor

Quarter-mile-wide asteroid coming close to Earth

An asteroid bigger than an aircraft carrier will dart between the Earth and moon on Tuesday - the closest encounter by such a huge rock in 35 years.

But scientists say not to worry. It won't hit.

"We're extremely confident, 100 percent confident, that this is not a threat," said the manager of NASA's Near Earth Object Program, Don Yeomans. "But it is an opportunity."

© NASA/Cornell/Arecibo
This image made from radar data taken in April 2010 by the Arecibo Radar Telescope in Puerto Rico and provided by NASA/Cornell/Arecibo shows asteroid 2005 YU55.
The asteroid named 2005 YU55 is being watched by ground antennas as it approaches from the direction of the sun. The last time it came within so-called shouting distance was 200 years ago.

Closest approach will occur at 6:28 p.m. EST Tuesday when the asteroid passes within 202,000 miles of Earth. That's closer than the roughly 240,000 miles between the Earth and the moon.

Sun

Largest Sunspot in Years Observed on the Sun

© SDO
The gigantic sunspot in the upper left of this image is about 50,000 miles (80,000 km) long and was observed on the sun by NASA's Solar Dynamics Observatory on Nov. 3, 2011.

One of the largest sunspots in years has appeared on the sun, darkening part of its glowing face.

The massive sunspot, called AR1339, is about 50,000 miles (80,000 km) long, and 25,000 miles (40,000 km) wide, reports SpaceWeather.com. For comparison, Earth itself is only 8,000 miles (12,800 km) wide.

The sunspot behemoth isn't yet facing our planet, but was spotted today (Nov. 3) by NASA's Solar Dynamics Observatory (SDO) satellite. The spacecraft's photos of the giant sunspot show the solar region as it comes into view on the northeastern edge, or limb, of the sun.

When it does turn our way in the days ahead, it should be an "easy target for backyard solar telescopes," according to SpaceWeather.com.

The sunspot is actually a group of nearby darkened spots on the sun, some of which are individually wider than planet Earth.

Sun

Large sunspot group turning Earthward

One of the largest sunspots in years is rotating over the sun's northeastern limb. NASA's Solar Dynamics Observatory took this picture of AR1339 during the early hours of Nov. 3rd:

Image
© SDO
Measuring some 40,000 km wide and at least twice that in length, the sprawling sunspot group is an easy target for backyard solar telescopes. Two or three of the sunspot's dark cores are wider than Earth itself.

Naturally, such a large sunspot has potential for strong flares. NOAA forecasters estimate a 50% chance of M-class solar flares during the next 24 hours. One such eruption has already occured: An M4-flare at 2200 UT on Nov. 2nd produced a bright flash of extreme UV radiation (SDO movie) and hurled a coronal mass ejection (CME) into space. The CME is not heading our way. Future CMEs could have greater effect as AR1339 turns toward Earth in the days ahead.