U-B-V photometry of the spectroscopic-visual triple HD 165590

U-band flares and sympathetic flaring on G1 65

U-Quantile-Statistics

U-series isochron dating: A generalized method employing total-sample dissolution

U-Th zonation-dependent alpha-ejection in (U-Th)/He chronometry

U.S. Naval Observatory CCD parallaxes of faint stars. I - Program description and first results

UBV photometry of eclipsing binaries in the SMC

UBV photometry of HK survey stars (Preston+, 1991)

UBVRI aperture photometry of early-type galaxies

UBVRI photometry in cluster Tr 18 (Vazquez+, 1990)

UBVRIJHK color-temperature calibration (Worthey+, 2011)

UCB Algorithm for Exponential Distributions

UCD in the IVOA context

ULF Energy Transport Induced by Magnetospheric Boundary Oscillations

ULF Wave Activity in the Terrestrial Polar Cap and Polar Cap Boundary Regions as Observed by Cluster

ULF waves at comets Halley and Giacobini-Zinner - Comparison with simulations

ULTOR passive pose and position engine for spacecraft relative navigation

Ultra Low Temperature Ultra Low Power Instrument Packages for Planetary Surfaces

Ultra-Deep Chandra Observation of Galactic Oxygen-Rich Supernova Remnant G292.0+1.8: The First Images

Ultra-Deep MIPS Imaging of the Lockman Hole