Side by side observation and artist's impression of Asteroid 1999 KW4
Minimum Separation of Asteroid 1999 KW4 and Earth
Artist’s Impression of Asteroid 1999 KW4
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ESOcast 202 Light: ESO helps protect Earth from dangerous asteroids
Artist’s Impression of Asteroid 1999 KW4
VLT observes a passing double asteroid hurtling by Earth at 70000 km/h
This recent close encounter with 1999 KW4 comes just a month before Asteroid Day,
an official United Nations day of education and awareness about
asteroids, to be celebrated on 30 June. Events will be held on five
continents, and ESO will be among the major astronomical organisations
taking part. The ESO Supernova Planetarium & Visitor Centre
will host a range of activities on the theme of asteroids on the day,
and members of the public are invited to join in the celebrations.
Notes
[1] This distance is about 14 times the distance to the Moon — close enough to study, but not close enough to be threatening! Many small asteroids fly past the Earth much closer than 1999 KW4, occasionally closer than the Moon. Earth’s most recent encounter with an asteroid took place on 15 February 2013, when a previously unknown asteroid 18 metres across exploded as it entered Earth's atmosphere over the Russian city of Chelyabinsk. The damage produced by the subsequent shockwave caused injuries to about 1,500 people.
More Information
ESO is the foremost intergovernmental astronomy organisation in Europe and the world’s most productive ground-based astronomical observatory by far. It has 16 Member States: Austria, Belgium, the Czech Republic, Denmark, France, Finland, Germany, Ireland, Italy, the Netherlands, Poland, Portugal, Spain, Sweden, Switzerland and the United Kingdom, along with the host state of Chile and with Australia as a Strategic Partner. ESO carries out an ambitious programme focused on the design, construction and operation of powerful ground-based observing facilities enabling astronomers to make important scientific discoveries. ESO also plays a leading role in promoting and organising cooperation in astronomical research. ESO operates three unique world-class observing sites in Chile: La Silla, Paranal and Chajnantor. At Paranal, ESO operates the Very Large Telescope and its world-leading Very Large Telescope Interferometer as well as two survey telescopes, VISTA working in the infrared and the visible-light VLT Survey Telescope. Also at Paranal ESO will host and operate the Cherenkov Telescope Array South, the world’s largest and most sensitive gamma-ray observatory. ESO is also a major partner in two facilities on Chajnantor, APEX and ALMA, the largest astronomical project in existence. And on Cerro Armazones, close to Paranal, ESO is building the 39-metre Extremely Large Telescope, the ELT, which will become “the world’s biggest eye on the sky”.
Links
Contacts
Calum Turner
ESO Public Information Officer
Garching bei München, Germany
Tel: +49 89 3200 6670
Email: pio@eso.org
The unique capabilities of the SPHERE
instrument on ESO’s Very Large Telescope have enabled it to obtain the
sharpest images of a double asteroid as it flew by Earth on 25 May.
While this double asteroid was not itself a threatening object,
scientists used the opportunity to rehearse the response to a hazardous
Near-Earth Object (NEO), proving that ESO’s front-line technology could
be critical in planetary defence.
The
International Asteroid Warning Network (IAWN) coordinated a
cross-organisational observing campaign of the asteroid 1999 KW4 as it
flew by Earth, reaching a minimum distance of 5.2 million km [1]
on 25 May 2019. 1999 KW4 is about 1.3 km wide, and does not pose any
risk to Earth. Since its orbit is well known, scientists were able to
predict this fly-by and prepare the observing campaign.
ESO joined the campaign with its flagship facility, the Very Large Telescope (VLT). The VLT is equipped with SPHERE
— one of the very few instruments in the world capable of obtaining
images sharp enough to distinguish the two components of the asteroid,
which are separated by around 2.6 km.
SPHERE was designed to observe exoplanets; its state-of-the-art adaptive optics
(AO) system corrects for the turbulence of the atmosphere, delivering
images as sharp as if the telescope were in space. It is also equipped
with coronagraphs to dim the glare of bright stars, exposing faint
orbiting exoplanets.
Taking a break from its usual night job hunting exoplanets,
SPHERE data helped astronomers characterise the double asteroid. In
particular, it is now possible to measure whether the smaller satellite
has the same composition as the larger object.
“These data, combined with all those that are obtained
on other telescopes through the IAWN campaign, will be essential for
evaluating effective deflection strategies in the event that an asteroid
was found to be on a collision course with Earth,” explained ESO astronomer Olivier Hainaut. “In
the worst possible case, this knowledge is also essential to predict
how an asteroid could interact with the atmosphere and Earth’s surface,
allowing us to mitigate damage in the event of a collision.”
“The double asteroid was hurtling by the Earth at more than 70 000 km/h, making observing it with the VLT challenging,”
said Diego Parraguez, who was piloting the telescope. He had to use all
his expertise to lock on to the fast asteroid and capture it with
SPHERE.
Bin Yang, VLT astronomer, declared “When we saw the
satellite in the AO-corrected images, we were extremely thrilled. At
that moment, we felt that all the pain, all the efforts were worth it.” Mathias Jones, another VLT astronomer involved in these observations, elaborated on the difficulties. “During
the observations the atmospheric conditions were a bit unstable. In
addition, the asteroid was relatively faint and moving very fast in the
sky, making these observations particularly challenging, and causing the
AO system to crash several times. It was great to see our hard work pay
off despite the difficulties!”
While 1999 KW4 is not an impact threat, it bears a striking
resemblance to another binary asteroid system called Didymos which
could pose a threat to Earth sometime in the distant future.
Didymos and its companion called “Didymoon” are the target
of a future pioneering planetary defence experiment. NASA’s DART
spacecraft will impact Didymoon in an attempt to change its orbit around
its larger twin, in a test of the feasibility of deflecting asteroids.
After the impact, ESA’s Hera mission will survey the Didymos asteroids
in 2026 to gather key information, including Didymoon’s mass, its
surface properties and the shape of the DART crater.
The success of such missions depends on collaborations
between organisations, and tracking Near-Earth Objects is a major focus
for the collaboration between ESO and ESA. This cooperative effort has
been ongoing since their first successful tracking of a potentially hazardous NEO in early 2014.
“We are delighted to be playing a role in keeping Earth safe from asteroids,” said Xavier Barcons, ESO’s Director General. “As
well as employing the sophisticated capabilities of the VLT, we are
working with ESA to create prototypes for a large network to take
asteroid detection, tracking and characterization to the next level.”
Notes
[1] This distance is about 14 times the distance to the Moon — close enough to study, but not close enough to be threatening! Many small asteroids fly past the Earth much closer than 1999 KW4, occasionally closer than the Moon. Earth’s most recent encounter with an asteroid took place on 15 February 2013, when a previously unknown asteroid 18 metres across exploded as it entered Earth's atmosphere over the Russian city of Chelyabinsk. The damage produced by the subsequent shockwave caused injuries to about 1,500 people.
More Information
ESO is the foremost intergovernmental astronomy organisation in Europe and the world’s most productive ground-based astronomical observatory by far. It has 16 Member States: Austria, Belgium, the Czech Republic, Denmark, France, Finland, Germany, Ireland, Italy, the Netherlands, Poland, Portugal, Spain, Sweden, Switzerland and the United Kingdom, along with the host state of Chile and with Australia as a Strategic Partner. ESO carries out an ambitious programme focused on the design, construction and operation of powerful ground-based observing facilities enabling astronomers to make important scientific discoveries. ESO also plays a leading role in promoting and organising cooperation in astronomical research. ESO operates three unique world-class observing sites in Chile: La Silla, Paranal and Chajnantor. At Paranal, ESO operates the Very Large Telescope and its world-leading Very Large Telescope Interferometer as well as two survey telescopes, VISTA working in the infrared and the visible-light VLT Survey Telescope. Also at Paranal ESO will host and operate the Cherenkov Telescope Array South, the world’s largest and most sensitive gamma-ray observatory. ESO is also a major partner in two facilities on Chajnantor, APEX and ALMA, the largest astronomical project in existence. And on Cerro Armazones, close to Paranal, ESO is building the 39-metre Extremely Large Telescope, the ELT, which will become “the world’s biggest eye on the sky”.
Links
- ESO/ESA observations of Didymos
- Photos of the VLT
- DART mission
- Hera Mission
- ESOblog on ESA-ESO collaboration
- ESA's technical web portal for near-Earth objects
Contacts
Calum Turner
ESO Public Information Officer
Garching bei München, Germany
Tel: +49 89 3200 6670
Email: pio@eso.org
Source: ESO/News
