A Survey of Ensemble Physical Properties of Cometary Nuclei (SEPPCoN) is underway to characterize the nuclei of 100 Jupiter-family comets (JFC). The survey combines both visible and mid-infrared observations to measure the JFC size and albedo distributions. We inspected Spitzer Space Telescope MIPS and IRS images of the survey targets for dust

Unlike the trial procedures, a reliable characterization of the vertical turbulence distribution on a site should be based in unbiased statistical sample criteria. The sample size is as important as the criteria under which it is taken. We present here the statistical results of the optical turbulence profiles at the Roque de los Muchachos

Last year (Campins et al. 2006), we reported near-infrared rotational variability in ground-based spectra of comet-asteroid transition object 944 Hidalgo. Since then, we carried out a rotationally resolved study of Hidalgo at mid-infrared wavelengths using the Infrared Spectrograph (IRS) on NASA's Spitzer Space Telescope. We obtained 7 to 38 micron

During the last years a mayor effort has been carried out both, in defining key parameters to quantify the quality of a site for astronomical observations, and to design reliable techniques and tools to compare different sites. Here, we will revise some of the parameters relevant for astronomical site evaluation, and we will also brief on the

Multi-object spectroscopic observations of A115 were carried out at the TNG telescope in December 2003 during the program of proposal AOT8/CAT-G6. (1 data file).

We study the two-dimensional kinematics of the Hα-emitting gas in the nearby barred Scd galaxy NGC 6946, in order to determine the pattern speed of the primary m=2 perturbation mode. The pattern speed is a crucial parameter for constraining the internal dynamics, estimating the impact velocities of the gravitational perturbation at the resonance