Preliminary Link of the Hipparcos and VLBI Reference Frames
We present a comparison of VLBI and Hipparcos astrometric parameters of several optically bright radio-emitting stars.
VLBI Hipparcos astrometry reference systems↗
Engineering topics
Preston, R.
Publications and source records attributed to Preston, R..
A Relativistically Expanding Radio Source Associated with GRO J1655-40
GRO J1655-40 was discovered as a new, bright X-ray source with the BATSE detector of the Gamma Ray Observatory (GRO) on July 27, 1994.
VLBI↗
Multi-Epoch VLA Observations of the Enstein Ring PKS1830-211
We present radio observations of the gravitational lens PKS1830-211 at 8.4 and 15 GHz acquired using the Very Large Array.
cosmology↗
The determination of the trajectory of the motion of a balloon probe in the Venusian atmosphere via VLBI
The trajectories of the motion of balloons floating freely in the Venusian atmosphere (the Vega project) are measured via VLBI. The balloon in the southern hemisphere moved with an average velocity of 66 m/s. The latitudinal velocity component was equal to 3.4 + or - 0.5 m/s and was directed northward. The velocity of the balloon in the northern hemisphere was equal to 69 m/s and was directed nearly parallel to the equator.
Sagdeev, R. Z.↗
VLBI observations of Supernova 1987 A
VLBI observations at 2.3 GHz of SN1987 A on February 28, 1987 yielded no fringes, implying, for an optically thin shell, a lower bound on the (outer) diameter of 1.9 mas. From the comparison of the VLBI and optical results, it is inferred that the radiosphere of SN1987 A was either about equal to, or larger than, the photosphere of the supernova five days after the explosion.
Shapiro, I.↗
Results of the Australian geodetic VLBI experiment
The 250-2500 km baseline vectors between radio telescopes located at Tidbinbilla (DSS43) near Canberra, Parkes, Fleurs (X3) near Sydney, Hobart and Alice Springs were determined from radio interferometric observations of extragalactic sources. The observations were made during two 24-hour sessions on 26 April and 3 May 1982, and one 12-hour night-time session on 28 April 1982. The 275 km Tidbinbilla - Parkes baseline was measured with an accuracy of plus or minus 6 cm. The remaining baselines were measured with accuracies ranging from 15 cm to 6 m. The higher accuracies were achieved for the better instrumented sites of Tidbinbilla, Parkes and Fleurs. The data reduction technique and results of the experiment are discussed.
Harvey, B. R.↗
Reaction of hydrogen atomic ions with hydrogen molecules - Experiment, ab initio theory and a conceptual model
Ab initio calculations on trajectories and nonadiabatic transitions in reactions of hydrogen atomic ions with hydrogen molecules
Krenos, J.↗