Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Rocks twirl in remote two-step

18.04.2002


This pair of asteroids is locked in a mutual orbit.
© Nature


One lump of rock is revealed as two in the distant Kuiper belt.

The stand-offish dance of two asteroids at the outer reaches of the Solar System is captivating astronomers. The two rocky objects, discovered locked in mutual orbit, could tell us about the properties of the far-flung Kuiper belt.

Christian Veillet and his team1 studied an object called 1998 WW31 in the Kuiper belt, a sparsely populated region of space beyond the orbit of Neptune. The object was previously thought to be a single rock.



One is in fact two, the team found, using images obtained by the Canada-France-Hawaii Telescope in Hawaii. And the pair follow an unusual elongated, ellipse-shaped orbit which keeps them 20-40,000 km apart. This is considered a very distant partnership for a ’binary object’.

The circling pair, which complete a rotation every 570 days, might offer some vital clues to the composition of rocks in the Kuiper belt. Its extreme distance makes resident objects difficult to study.

If one of the circling bodies eclipses the other, the pair’s size could be estimated and hence their density. Understanding the composition of material in the Kuiper belt - which is thought to contain rubble left over from planet formation - might help to discriminate between different explanations for the formation of the Solar System.

Kuiper-belt binaries are hard to spot, because two small bodies can appear as a single fuzzy blob of reflected sunlight at such long distances. Even if two spots are seen, several images are needed to rule out the possibility that they are two adjacent stars along our line of sight. Veillet and his team carried out such careful analyses before they could confidently claim that 1998 WW31 is indeed a binary.

The elliptical orbit is very different from that of the best known partnership in the Kuiper belt: the outermost planet Pluto and its moon Charon. The binary systems known in the asteroid belt between Mars and Jupiter also stick closer together than 1998 WW31.

The new discovery challenges existing theories of how two asteroid-like bodies can become bound together by their gravitational pull. Researchers are not yet clear why the two rocks have not been ripped apart by interactions with other bodies in the Kuiper belt.

References
  1. Veillet, C. et al The binary Kuiper-belt object 1998 WW31. Nature, 416, 711 - 713, (2002).

PHILIP BALL | © Nature News Service

More articles from Physics and Astronomy:

nachricht APEX takes a glimpse into the heart of darkness
25.05.2018 | Max-Planck-Institut für Radioastronomie

nachricht First chip-scale broadband optical system that can sense molecules in the mid-IR
24.05.2018 | Columbia University School of Engineering and Applied Science

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Powerful IT security for the car of the future – research alliance develops new approaches

The more electronics steer, accelerate and brake cars, the more important it is to protect them against cyber-attacks. That is why 15 partners from industry and academia will work together over the next three years on new approaches to IT security in self-driving cars. The joint project goes by the name Security For Connected, Autonomous Cars (SecForCARs) and has funding of €7.2 million from the German Federal Ministry of Education and Research. Infineon is leading the project.

Vehicles already offer diverse communication interfaces and more and more automated functions, such as distance and lane-keeping assist systems. At the same...

Im Focus: Molecular switch will facilitate the development of pioneering electro-optical devices

A research team led by physicists at the Technical University of Munich (TUM) has developed molecular nanoswitches that can be toggled between two structurally different states using an applied voltage. They can serve as the basis for a pioneering class of devices that could replace silicon-based components with organic molecules.

The development of new electronic technologies drives the incessant reduction of functional component sizes. In the context of an international collaborative...

Im Focus: LZH showcases laser material processing of tomorrow at the LASYS 2018

At the LASYS 2018, from June 5th to 7th, the Laser Zentrum Hannover e.V. (LZH) will be showcasing processes for the laser material processing of tomorrow in hall 4 at stand 4E75. With blown bomb shells the LZH will present first results of a research project on civil security.

At this year's LASYS, the LZH will exhibit light-based processes such as cutting, welding, ablation and structuring as well as additive manufacturing for...

Im Focus: Self-illuminating pixels for a new display generation

There are videos on the internet that can make one marvel at technology. For example, a smartphone is casually bent around the arm or a thin-film display is rolled in all directions and with almost every diameter. From the user's point of view, this looks fantastic. From a professional point of view, however, the question arises: Is that already possible?

At Display Week 2018, scientists from the Fraunhofer Institute for Applied Polymer Research IAP will be demonstrating today’s technological possibilities and...

Im Focus: Explanation for puzzling quantum oscillations has been found

So-called quantum many-body scars allow quantum systems to stay out of equilibrium much longer, explaining experiment | Study published in Nature Physics

Recently, researchers from Harvard and MIT succeeded in trapping a record 53 atoms and individually controlling their quantum state, realizing what is called a...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

In focus: Climate adapted plants

25.05.2018 | Event News

Save the date: Forum European Neuroscience – 07-11 July 2018 in Berlin, Germany

02.05.2018 | Event News

Invitation to the upcoming "Current Topics in Bioinformatics: Big Data in Genomics and Medicine"

13.04.2018 | Event News

 
Latest News

In focus: Climate adapted plants

25.05.2018 | Event News

Flow probes from the 3D printer

25.05.2018 | Machine Engineering

Less is more? Gene switch for healthy aging found

25.05.2018 | Life Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>