Last updated on April 16, 2014 at 21:24 EDT

Latest Yarkovsky–O'Keefe–Radzievskii–Paddack effect Stories

Astronomers Get A Good Look Inside Asteroid Itokawa
2014-02-05 12:24:19

[ Watch the Video: What's Inside An Asteroid? ] Lee Rannals for redOrbit.com - Your Universe Online Astronomers, using the European Southern Observatory’s (ESO) New Technology Telescope (NTT), have discovered that asteroids have a highly varied internal structure. The astronomers used the instrument to look at different parts of the asteroid Itokawa, which was the target of the Japanese spacecraft Hayabusa in 2005. This spacecraft took samples of an asteroid for the first time and...

2010-08-26 07:50:00

The asteroid belt between Mars and Jupiter is often depicted as a dull zone of dead rocks with an occasional wayward speedster smashing through on its way toward the sun. A new study appearing in the Aug. 26 issue of the journal Nature paints a different picture, one of slow but steady change, where sunlight gradually drives asteroids to split in two and move far apart to become independent asteroids among the millions orbiting the sun. "This shows that asteroids are not inert, dead bodies...

2010-01-12 11:00:00

Close-up images of asteroid (2867) Steins, obtained with the OSIRIS cameras on Rosetta, have provided extensive new measurements of the physical properties of this main-belt asteroid. Steins is revealed to be a loosely-bound 'rubble pile' whose diamond shape has been honed by the YORP effect. This is the first time this effect has been seen in a main-belt asteroid. The results are reported by H. Uwe Keller and colleagues in the January 8 issue of Science magazine. Most models of Solar System...

2008-07-09 16:40:00

Asteroids with moons, which scientists call binary asteroids, are common in the solar system. A longstanding question has been how the majority of such moons are formed. In this week's issue of the journal Nature, a trio of astronomers from Maryland and France say the surprising answer is sunlight, which can increase or decrease the spin rate of an asteroid. Derek Richardson, of the University of Maryland, his former student Kevin Walsh, now Poincar© Fellow in the Planetology Group in...

2007-03-09 12:53:31

Astronomers have observed an asteroid change the rate at which it spins for the first time, and shown that this is due to a theoretical effect predicted but never before seen. The international team of scientists from Europe and the United States used a range of telescopes to find that the asteroid is rotating faster by 1 millisecond every year. The acceleration in the rate of rotation is due to heating of the asteroid's surface by the Sun. Eventually it may spin faster than any known...

2007-03-07 14:21:57

For the very first time, astronomers have witnessed the speeding up of an asteroid's rotation, and have shown that it is due to a theoretical effect predicted but never seen before. The international team of scientists used an armada of telescopes to discover that the asteroid's rotation period currently decreases by 1 millisecond every year, as a consequence of the heating of the asteroid's surface by the Sun. Eventually it may spin faster than any known asteroid in the solar system and...