NASA : Un Pequeño Asteroide Pasará Cerca de la Tierra el 5 de Marzo, será el asteroide 2013 TX68

Hola amigos: A VUELO D EUN QUINDE EL BLOG., la Agencia Espacial NASA, en su versión en español nos anticipa que hoy 5 de marzo, pasará el Asteroide 2013 TX68, entre una distancia de 14 millones de kilómetros o lo más cerca de ésta a tan sólo 17,000 kilómetros cerca a La Tierra..

Más información:

https://www.lanasa.net/

04.03.16.- Un pequeño asteroide que hace dos años pasó cerca de la Tierra a una distancia cómoda de alrededor de 1,3 millones de millas (2 millones de kilómetros) va a pasar de nuevo mucho más cerca nuestro planeta este fin de semana, pero de manera segura.

Durante el próximo sobrevuelo del sábado 5 de marzo, el punto de máximo acercamiento del asteroide 2013 TX68 oscilaría de la Tierra entre una distancia de 14 millones de kilómetros o lo más cerca de ésta a tan sólo 17.000 kilómetros. La variación en las posibles distancias de aproximación máxima se debe a la amplia gama de posibles trayectorias para este objeto, ya que fue seguido por un corto tiempo después de su descubrimiento.

 

El gráfico indica la nube de posibles ubicaciones del asteroide 2013 TX68 cuando esté en su máximo acercamiento a la Tierra durante el sobrevuelo seguro a nuestro planeta el 5 de marzo.

Image Credit: NASA / JPL-Caltech /NASANET

 

Científicos en el Centro de Estudios de la NASA NEO (CNEOS) en el Laboratorio de Propulsión a Chorro en Pasadena, California, han determinado que no hay posibilidad de que este objeto impacte contra la Tierra durante este sobrevuelo. Sin embargo, han identificado una oportunidad muy remota de que este pequeño asteroide podría impactar el 28 de Septiembre de 2017, con probabilidades de no más de 1 entre 250 millones. Los futuros sobrevuelos cerca de la Tierra en 2046 y 2097 tienen una probabilidad aún de menor de impacto.

"Las posibilidades de colisión en cualquiera de las tres futuras fechas de sobrevuelo son demasiado pequeñas para provocar una preocupación real", dijo Paul Chodas, gerente de CNEOS. "Confío plenamente en todas las observaciones futuras para reducir aún más la probabilidad"

Se estima que el asteroide 2013 TX68 tenga alrededor de 30 metros (100 pies) de diámetro. En comparación, el asteroide que sobrepasó la atmósfera en Chelyabinsk, Rusia, hace tres años tenía una anchura de aproximadamente 20 metros (65 pies). Si un asteroide del tamaño de 2013 TX68 fuera a reentrar en la atmósfera de la Tierra, es probable que produjese una explosión en el aire con aproximadamente el doble de energía de la que produjo el de Chelyabinsk.

El asteroide fue descubierto por el programa “Catalina Sky Survey” patrocinado por la NASA el 6 de octubre de 2013, cuando se acercaba a la Tierra en el lado nocturno. Después de tres días de seguimiento, el asteroide pasó por el cielo durante el día y ya no se pudo observar. Debido a que no fue rastreado durante mucho tiempo, los científicos no pueden predecir ahora su órbita precisa alrededor del Sol, pero si saben que no puede afectar a la Tierra durante su sobrevuelo del próximo mes de marzo.

Para obtener más información sobre la Oficina de Coordinación de Defensa Planetaria de la NASA, visite:

http://www.nasa.gov/planetarydefense

NASA en español.
Guillermo Gonzalo Sánchez Achutegui
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ESA - Expertos europeos se reúnen en Madrid para evaluar las opciones ante un asteroide como el de Chelyabinsk

Asteroid trace over Chelyabinsk, Russia, on 15 February 2013

8 May 2013

In February, a speeding asteroid slammed into our atmosphere and exploded high over Russia’s Ural region, injuring hundreds and causing millions of euros of damage. What should we do if we have a similar – or even bigger – strike in the future?

Of the more than 600 000 known asteroids in our Solar System, almost 10 000 are classified as near-Earth objects, or NEOs, because their orbits bring them relatively close to Earth’s path. 

Dramatic proof that any of these can strike Earth came on 15 February, when an unknown object thought to be 17–20 m in diameter arrived at 66 000 km/h and exploded high above Chelyabinsk, Russia, with 20–30 times the energy of the Hiroshima atomic bomb.
The resulting shock wave caused widespread damage and injuries, making it the largest known natural object to have entered the atmosphere since the 1908 Tunguska event, which destroyed a remote forest area of Siberia.

“It’s important that we become aware of the current and future position of NEOs, develop estimates on the likelihood of impacts and assess the possible consequences,” says Detlef Koschny, Head of NEO activities in the Agency’s Space Situational Awareness (SSA) Programme Office.

Artist's impression of asteroids passing Earth

“More importantly, we must consider whether and how warning, mitigation and possible deflection actions can be taken. It’s important not only for Europe, but for the rest of the planet, too.”

One aspect of ESA’s four-year-old effort requires the development of an integrated system to scan the sky nightly for as-yet-undiscovered NEOs.

Another important element is studying how mitigation measures can be applied in the case of smaller NEOs, and how to deflect any larger ones that may seriously threaten our home planet.

This week, Deimos Space, an industrial partner working for ESA on SSA, has invited top researchers from universities, research institutes, national space agencies and industry in Europe and the USA to discuss the state of the art in NEO impact effects and threat mitigation.
The meeting is taking place in Tres Cantos, Spain, near Madrid.

“A great deal of work remains to be done, for example, in computer modelling of impact effects, how airbursts differ from ground strikes, kinetic versus explosive deflection strategies and much more,” says Gerhard Drolshagen, of the SSA Programme Office.
“The aim is to develop plans that will guide us in current and future NEO research and development.”
Ultimately, ESA aims to develop the capability to integrate European current and new assets such as automated telescopes into a coordinated and more efficient NEO system that can provide nightly sky surveys and advanced warning.
“With this, we can work with our partner agencies, scientists, industry and international bodies like the UN to offer firm options to national governments and political decision-makers,” says Nicolas Bobrinsky, Head of ESA’s SSA Programme.
“Events like the Chelyabinsk strike show that the NEO hazard is not just theoretical, and we need to invest in practical measures today to address tomorrow’s threats.”
Editor’s note: A summary of the workshop findings will be available as a downloadable PDF after 8 May.

ESA

Guillermo Gonzalo Sánchez Achutegui

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nsf.gov - News - Incoming! Then Outgoing! Waves Generated by Russian Meteor Recorded Crossing the U.S.

Network of stations with seismometers and air pressure sensors detected the blast waves.-
 
 

Meteor trail over eastern Russia is seen in this image from the Russian Emergency Ministry.
Credit: Russian Emergency Ministry
Download the high-resolution JPG version of the image. (78 KB) 
 

Trajectory of the meteor as it neared impact in Russia.
Credit: Wikimedia Commons
Download the high-resolution JPG version of the image. (84 KB)
 

Is it a bird, a plane, a...meteor? A view of the meteor as it streaked by buildings in Russia.
Credit: Russian Emergency Ministry
Download the high-resolution JPG version of the image. (101 KB)
 

Hole in the ice at Russia's Lake Chebarkul, said to be caused by the meteor.
Credit: Wikimedia Commons
Download the high-resolution JPG version of the image. (33 KB) 

As the meteor streaked by then crashed, window glass in eastern Russia shattered.
Credit: Russian Emergency Ministry
Download the high-resolution JPG version of the image. (142 KB)



 
 Infrasound pressure waves are detected by a sensor installed in an EarthScope TA station.
Credit: IRIS
Download the high-resolution JPG version of the image. (509 KB)

A network of seismographic stations recorded spectacular signals from the blast waves of the meteor that landed near Chelyabinsk, Russia, as the waves crossed the United States.

The National ScieMeteornce Foundation- (NSF) supported stations are used to study earthquakes and the Earth's deep interior.

While thousands of earthquakes around the globe are recorded by seismometers in these stations--part of the permanent Global Seismographic Network (GSN) and EarthScope's temporary Transportable Array (TA)--signals from large meteor impacts are far less common.

The meteor explosion near Chelyabinsk on Feb. 15, 2013, generated ground motions and air pressure waves in the atmosphere. The stations picked up the signals with seismometers and air pressure sensors.

The ground motions were recorded by the GSN and the TA. The pressure waves were detected by special sensors that are part of the TA.

"The NSF-supported Global Seismic Network and EarthScope Transportable Array made spectacular recordings of the Chelyabinsk meteor's impact," says Greg Anderson, program director in NSF's Division of Earth Sciences.

"These recordings of seismic waves through the Earth, and sound waves through the atmosphere, are good examples of how these facilities can help global organizations better monitor earthquakes, clandestine nuclear tests and other threats."

Incoming! Then outgoing!

The Chelyabinsk meteor exploded in the atmosphere at approximately 9.20 a.m. local time.

The blast caused significant damage in the city, breaking thousands of windows and injuring more than 1,000 people.

Energy from the blast created pressure waves in the atmosphere that moved rapidly outward and around the globe. The blast also spread within the Earth as a seismic wave.

The two wave types--seismic wave and pressure wave--travel at very different speeds.

Waves in the ground travel quickly, at about 3.4 kilometers per second. Waves in the atmosphere are much slower, moving at about 0.3 kilometers per second, and can travel great distances.

GSN stations in Russia and Kazakhstan show the ground-traveling wave as a strong, abrupt pulse with a duration of about 30 seconds.

The atmospheric waves--referred to as infrasound--were detected across a range of inaudible frequencies and were observed at great distances on infrasound microphones.

When the infrasound waves reached the eastern United States--after traveling 8.5 hours through the atmosphere across the Arctic from the impact site in Russia--they were recorded at TA stations at the Canadian border.

The infrasound waves reached Florida three hours later, nearly 12 hours after the blast.

Infrasound sensors at TA stations along the Pacific coast and in Alaska also recorded the blast, but with signatures that were shorter and simpler than those recorded by stations in the mid-continent and along the southeastern seaboard.

The duration of the signals, and the differences between the waveforms in the east and west, scientists believe, are related to the way in which energy travels and bounces on its long path through the atmosphere.

EarthScope Transportable Array

The Transportable Array is operated by the IRIS (Incorporated Research Institutions for Seismology) Consortium as part of NSF's EarthScope Project. It consists of 400 stations traversing the United States, recording at each site along the way for two years.

Each of the TA stations was originally equipped with sensitive broadband seismometers for measuring ground motions, but in 2010, NSF awarded the University of California, San Diego, in cooperation with IRIS, funding to add pressure and infrasound sensors.

These special sensors help scientists understand how changes in pressure affect ground motions recorded by the TA's seismometers and provide a view of regional pressure changes related to weather patterns.

The sensors also record events such as tornadoes, derechos, rocket launches, chemical explosions--and meteor impacts.

The Chelyabinsk meteor is the largest signal recorded to date.

In 2013, the Transportable Array will reach states in the Northeast, completing its traverse of the contiguous United States and southern Canada.

Global Seismographic Network

The GSN's primary mission is collecting data to monitor worldwide earthquakes and to study the Earth's deep interior.

It's funded jointly by NSF and the U.S. Geological Survey and is managed and operated by IRIS in collaboration with the U.S. Geological Survey's Albuquerque Seismological Laboratory and the University of California, San Diego.

As part of a worldwide network of seismic stations, data from the GSN have contributed over the past three decades to the monitoring of nuclear explosions at test sites in the United States, the former Soviet Union, India, Pakistan and Korea. For example, GSN stations provided observations of the Korean nuclear test on Feb. 12, 2013.

-NSF-

Media Contacts Cheryl Dybas, NSF (703) 292-7734 cdybas@nsf.gov

Related WebsitesNSF EarthScope Project: http://www.earthscope.org
Incorporated Research Institutions for Seismology: http://www.iris.edu
Global Seismographic Network: http://www.iris.edu/hq/programs/gsn
IRIS 'special event' page for the Chelyabinsk meteor: http://www.iris.edu/dms/nodes/dmc/specialevents/2013/02/19/chelyabinsk-russia-bolide-meteor/

The National Science Foundation (NSF) is an independent federal agency that supports fundamental research and education across all fields of science and engineering. In fiscal year (FY) 2012, its budget is $7.0 billion. NSF funds reach all 50 states through grants to nearly 2,000 colleges, universities and other institutions. Each year, NSF receives over 50,000 competitive requests for funding, and makes about 11,000 new funding awards. NSF also awards nearly $420 million in professional and service contracts yearly.

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 The National Science Foundation (NSF).-

 Guillermo Gonzalo Sánchez Achutegui

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ESA - Russian asteroid strike

 
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 An image from the SEVIRI instrument aboard Eumetsat's Meteosat-10 geostationary satellite. The vapour trail visible in the centre of the image was left by an asteroid that struck Earth near Chelyabinsk, Russia, 15 February 2013, around 03:15 UT. Initial media reports included accounts of injuries and property loss. This image uses data from the High Resolution Visible (HRV) channel of SEVIRI that can produce images with both high spatial and temporal resolution.

A space rock a few metres across exploded in Earth’s atmosphere above the city of Chelyabinsk, Russia today at about 03:15 GMT. The numerous injuries and significant damage remind us that what happens in space can affect us all. 

While precise information on the size, mass and composition of the object are yet to be confirmed, videos show a fireball and explosion consistent with an asteroid up to a few metres in size exploding in the atmosphere, possibly several to ten kilometres above the surface.

In this type of event, if the explosion altitude is less than 10 km or so, the resulting shockwave can cause damage on the ground, such as shattering windows. Debris from the object may be found later.

“Current information, which is not yet complete nor confirmed, points to a small asteroid,” said Detlef Koschny, Head of Near-Earth Object activity at ESA’s Space Situational Awareness (SSA) programme office.
“There is no way it could have been predicted with the technical means available today. What can be said with near certainty is that this object has no connection with asteroid 2012 DA14.”

Asteroid 2012 DA14 made a close flyby of Earth at 19:27 GMT (20:27 CET) today. 

Finding objects that pass close to our planet and are large enough to do damage if they enter our atmosphere is a major goal of ESA’s SSA programme.
In addition to conducting its own sky searches using ESA's Optical Ground Station in Tenerife, Spain, SSA is partnering with existing European and international asteroid survey activities.  

It also sponsors astronomer groups in Europe, supporting surveys carried out with their own equipment or allocating observation time on its Tenerife telescope. The office also provides access to orbit predictions, close flyby details and related data via its technical website at http://neo.ssa.esa.int

“Today’s event is a strong reminder of why we need continuous efforts to survey and identify near-Earth objects,” said Thomas Reiter, ESA’s Director of Human Spaceflight and Operations.
“Our SSA programme is developing a system of automated optical telescopes that can detect asteroids and other objects in solar orbits.”

Today’s event is a strong reminder of why we need continuous efforts to survey and identify near-Earth objects.

In cooperation with survey efforts worldwide, ESA’s goal is to spot near-Earth objects larger than 40 m at least three weeks before closest approach to our planet.
To achieve this, ESA, European industry and partner agencies are developing a system of automated 1 m-diameter telescopes capable of imaging the complete sky in one night.
In addition to Russian media, who reported immediately, all media worldwide have published images of notable damage around Chelyabinsk, and reports also mention numerous casualties.
“Our most sincere sympathies are with those suffering injury and property loss due to this event in Russia,” added Thomas Reiter.

 ESA

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Guillermo Gonzalo Sánchez Achutegui

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