By comparison of different parameters associated with a chaotic evolution, we discuss the relation between several populations of inner Solar System bodies. Tancredi (1998) found that the observed sample of Jupiter family comets (JFCs) and near-Earth asteroids (NEAs) have Lyapunov times (the inverse of Lyapunov characteristic exponents) grouped in

Not Available

The frequencies of solar p-modes are known to change over the solar cycle. There is also recent evidence that the relation between frequency shift of low-degree modes and magnetic flux or other activity indicators differs between the rising and falling phases of the solar cycle, leading to a hysteresis in such diagrams. We consider the influence of

Integral field optical spectroscopy with the INTEGRAL fiber-fed system and Hubble Space Telescope optical imaging are used to map the complex stellar and warm ionized gas structure in the ultraluminous infrared galaxy IRAS 12112+0305. Images reconstructed from wavelength-delimited extractions of the integral field spectra reveal that the observed

Available from the Minor Planet Center.

Narrow-band Hα and [Nii] images and high-dispersion spatially resolved echelle spectroscopy of the planetary nebula NGC 6891 are presented. These observations show a great wealth of structures. The bright central nebula is surrounded by an attached shell and a detached outer halo. Both the inner and intermediate shells can be described as