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Monitoring the Large Proper Motions of Radio Sources in the Orion BN/KL Region
We present absolute astrometry of four radio sources in the Becklin-Neugebauer/Kleinman-Low (BN/KL) region, derived from archival data (taken in 1991, 1995, and 2000) as well as from new observations
Dynamical Decay of a Massive Multiple System in Orion KL
We present absolute astrometry of 35 radio sources in the Orion Trapezium and Becklin-Neugebauer/Kleinman-Low (BN/KL) regions, obtained from Very Large Array archival observations collected over a
A fourth planet orbiting υ Andromedae
We present a 4-planet Keplerian fit for the radial velocity curve of the F8V star υ Andromeda, indicating the presence of a fourth planet in the system. We detect an additional fifth coherent signal
The exo-planetary system of 55 Cancri and the Titius-Bode Law
The recent discovery of a fth planet bound to 55 Cancri (Fischer et. al 2007) motivated us to investigate if this exo-planetary system ts some form of the Titius-Bode (TB) law. We found that a simple
A new upper limit to the mass loss from the central region of the Galaxy
A mass loss of 200 Msun yr⁻¹, as has been conservatively suggested if Weber is detecting gravitational waves from an isotropic source at the galactic center, is shown to be incompatible with (a) the
Standing Waves on the Moon
The existence of local annular and radial structures in the environment of lunar craters, and of a global selenographic tectonic pattern, is ascribed in part to standing “moonquakes” established
Proper Motions of the BN Object and the Radio Source I in Orion: Where and When Did the BN Object Become a Runaway Star?
We present absolute astrometry of the core of the Orion molecular cloud, made with Very Large Array archive data taken over the last two decades. Our analysis reveals that both the BN object and the
Supernovae remnants evolution, properties and galactic distribution, discussing criteria for catalog listing and remnants as X ray sources
Halo Wide Binaries and Moving Clusters as Probes of the Dynamical and Merger History of our Galaxy
Abstract Wide or fragile pairs are sensitive probes of the galactic potential, and they have been used to provide information about the galactic tidal field, the density of GMC and the masses of dark