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A low density of 0.8 g cm-3 for the Trojan binary asteroid 617 Patroclus
It is reported that the components of 617 Patroclus move around the system's centre of mass, describing a roughly circular orbit, and a very low density is derived, suggesting that they could have been formed in the outer part of the Solar System. Expand
A low-temperature origin for the planetesimals that formed Jupiter
It is shown that argon, krypton and xenon in Jupiter's atmosphere are enriched to the same extent as the other heavy elements, which suggests that the planetesimals carrying these elements must have formed at temperatures lower than predicted by present models of giant-planet formation. Expand
Models of the millimeter-centimeter spectra of the giant planets
Abstract Hitherto Jupiter's spectrum at short millimeter wavelenghts showed a clear discrepancy with model calculations (e.g., G.L. Berge and S. Gulkis, 1976 , In Jupiter (T. Gehrels, Ed.), pp.Expand
Coronal Field Opens at Lower Height During the Solar Cycles 22 and 23 Minimum Periods: IMF Comparison Suggests the Source Surface Should Be Lowered
The solar cycle 23 minimum period has been characterized by a weaker solar and interplanetary magnetic field. This provides an ideal time to study how the strength of the photospheric field affectsExpand
Triplicity and physical characteristics of Asteroid (216) Kleopatra
Abstract To take full advantage of the September 2008 opposition passage of the M-type Asteroid (216) Kleopatra, we have used near-infrared adaptive optics (AO) imaging with the W.M. Keck IIExpand
Titan's Clouds from Gemini and Keck Adaptive Optics Imaging
Using adaptive optics on the Gemini and Keck II telescopes, we found a thin haze and discrete clouds in Titan’s south polar troposphere. The discrete clouds vary on timescales of a few hours. WeExpand
Jupiter’s shrinking Great Red Spot and steady Oval BA: Velocity measurements with the ‘Advection Corrected Correlation Image Velocimetry’ automated cloud-tracking method
Abstract We show that between 1996 and 2006, the area circumscribed by the high-speed collar of the Great Red Spot (GRS) shrunk by 15%, while the peak velocities within its collar remained constant.Expand
Titan: High-Resolution Speckle Images from the Keck Telescope
Abstract Saturn's large moon Titan is unique among planetary satellites in that it possesses a thick atmosphere and a haze layer that is opaque to visible light. This haze is believed to be composedExpand
A Nearby M Star with Three Transiting Super-Earths Discovered by K2
Small, cool planets represent the typical end-products of planetary formation. Studying the architectures of these systems, measuring planet masses and radii, and observing these planets’ atmospheresExpand