Marcos A. van Dam

TL;DR: 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.

TL;DR: Open-loop deformable mirror telemetry from Altair and Keck adaptive optics is used to determine whether atmospheric turbulence follows the frozen flow hypothesis, indicating that the atmosphere is stable enough for predictive control to measure and adapt to prevailing atmospheric conditions before they change.

TL;DR: This paper shows that using four off-axis DFSs operating at J-band with 10 ms exposures, this paper is able to measure segment piston to the required 50 nm accuracy every 30 s with over 90% sky coverage.

TL;DR: A novel technique for deriving wave-front aberrations from two defocused intensity measurements based on the evolution of the cumulative density function of the intensity with light propagation, which requires use of a Radon transform.

TL;DR: This paper uses a model to characterize the LGS aberrations as a function of pupil angle, elevation, sodium structure, uplink tip/tilt error, detector field of view, the number of detector pixels, and seeing, and employs the model to estimate the L GSAberrations for the Palomar LGS AO system, the planned Keck I and the Thirty Meter Telescope AO systems.