Blog dedicado a cuentos, notas de interés, actividades políticas , sociales, historia, artes culinarias, fiestas patronales, astronomía, ciencia ficción, temas del Medio Ambiente ,y del acontecer Peruano y Mundial desde otro punto de vista ... Muy Personal y diferente!!!. *** Blog Fundado el 03 de Enero del 2008 ***
SEMANA DE YªHWēH: Introducción al Reino
El Reino de YHWH es indefinible a nuestros sentidos, oculto
a la mejor hazaña por entenderlo, pero visible para los nacidos
Contando los días, ...
Hace 3 días
domingo, 30 de octubre de 2016
ESA : 15 000 space rocks and counting .- Contando 15,000 rocas espaciales..........
The international effort to find, confirm and catalogue the multitude of asteroids that pose a threat to our planet has reached a milestone: 15 000 discovered – with many more to go.
The number of catalogued asteroids approaching Earth has grown rapidly since the count reached 10 000 only three years ago.
Near-Earth objects, or NEOs, are asteroids or comets with sizes ranging from metres to tens of kilometres whose orbits come close to ours, meaning they could hit our planet.
The discovered NEOs are part of a much larger population of more than 700 000 known asteroids in our Solar System.
“The rate of discovery has been high in the past few years, and teams worldwide have been discovering on average 30 new ones per week,” says Ettore Perozzi, manager of the NEO Coordination Centre at ESA’s centre near Rome, Italy.
“A few decades back, 30 were found in a typical year, so international efforts are starting to pay off. We believe that 90% of objects larger than 1000 m have been discovered, but – even with the recent milestone – we’ve only found just 10% of the 100 m NEOs and less than 1% of the 40 m ones.”
ESA is contributing through its Space Situational Awareness programme, setting up the centre in Italy to combine new and existing European telescope data and support a new network to distribute information.
Maintaining the European risk list
“The centre maintains the European Risk List, containing all objects for which an Earth-impact probability cannot yet be ruled out, however low,” says Detlef Koschny, heading the NEO element of the Space Situational Awareness office.
“There is only a tiny impact probability for any known object in the next 40 years, but all NEOs bear close watching to refine and understand their orbits.”
The coordination centre is also the focal point for scientific studies needed to improve warning services and provide near-realtime data to scientific bodies, international organisations and government decision-makers.
In recent years, astronomers working with or sponsored by ESA have concentrated on follow-up observations, confirming new objects and obtaining more reliable orbits. Some of this work was done with ESA’s own observatory on Tenerife in the Canary Islands.
Others have been instrumental in imaging or confirming the orbits of particularly interesting objects, such as asteroid 2016 RB1, which grazed our planet on 7 September 2016 by 34 000 km, within the orbit of many telecom satellites.
Future fly-eye telescope
In the coming years, the pace of discovery is likely to increase.
ESA is developing new ‘fly eye’ telescopes to conduct automated nightly wide-sky surveys with their very large fields of view. These are expected to begin operating around 2018. The Large Synoptic Survey Telescope, being built in Chile, is set to begin hunting space rocks in the near future.
These future telescopes offer the almost complete sky coverage and depth needed for humanity to be sure that as many NEOs as possible are discovered and identified before posing any threat.
Reentry data will help improve prediction models23 October 2015 A rare reentry of a suspected rocket body from a very high orbit next month offers an excellent opportunity to gather data to improve our knowledge of how objects interact with Earth’s atmosphere.
Helping Europe prepare for asteroid risk30 June 2015 Each year, astronomers worldwide discover over 1000 new asteroids or other space rocks that could strike our planet. And if one is spotted heading towards Earth, experts working in ESA and national emergency offices need to know who should do what, an...
ESA’s bug-eyed telescope to spot risky asteroids10 September 2014 Spotting Earth-threatening asteroids is tough partly because the sky is so big. But insects offer an answer, since they figured out long ago how to look in many directions at once.