F. Verbunt
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View article: The star catalogue of Wilhelm IV, Landgraf von Hessen-Kassel
The star catalogue of Wilhelm IV, Landgraf von Hessen-Kassel Open
Near the end of the 16th century Wilhelm IV, Landgraf von Hessen-Kassel, set up an observatory with the main goal to increase the accuracy of stellar positions primarily for use in astrology and for calendar purposes. A new star catalogue …
View article: The star catalogue of Wilhelm IV, Landgraf von Hessen-Kassel
The star catalogue of Wilhelm IV, Landgraf von Hessen-Kassel Open
We analyse a manuscript star catalogue by Wilhem IV, Landgraf von Hessen-Kassel from 1586. From measurements of altitudes and of angles between stars, given in the catalogue, we find that the measurement accuracy averages 26″ for eight fun…
View article: The star catalogue of Wilhelm IV, Landgraf von Hessen-Kassel: Accuracy of the catalogue and of the measurements
The star catalogue of Wilhelm IV, Landgraf von Hessen-Kassel: Accuracy of the catalogue and of the measurements Open
We analyse a manuscript star catalogue by Wilhem IV, Landgraf von Hessen-Kassel, from 1586. From measurements of altitudes and of angles between stars, given in the catalogue, we find that the measurement accuracy averages 26 arcsec for ei…
View article: \nThe star catalogue of Wilhelm IV, Landgraf von Hessen-Kassel. Accuracy of the catalogue and of the measurements
\nThe star catalogue of Wilhelm IV, Landgraf von Hessen-Kassel. Accuracy of the catalogue and of the measurements Open
\n Contains fulltext :\n 234284.pdf (Publisher’s version ) (Open Access)\n
View article: Why Halley Did Not Discover Proper Motion and Why Cassini Did
Why Halley Did Not Discover Proper Motion and Why Cassini Did Open
In 1717, Halley compared contemporaneous measurements of the latitudes of four stars with earlier measurements by ancient Greek astronomers and by Brahe, and from the differences concluded that these four stars showed proper motion. An ana…
View article: Astronomy as a human activity
Astronomy as a human activity Open
Farewell speech by prof. dr. Frank Verbunt, Professor of High Energy Astrophysics at the Radboud University’s Faculty of Science on Thursday 12 December 2019, 12 december 2019
View article: The observed velocity distribution of young pulsars
The observed velocity distribution of young pulsars Open
\n Contains fulltext :\n 180940.pdf (Publisher’s version ) (Open Access)\n
View article: How to estimate distance and velocity from parallax and proper motion
How to estimate distance and velocity from parallax and proper motion Open
If the observed parallax ϖ′ has a gaussian measurement error σ, there is a 68% probability that the actual parallax ϖ is in the range ϖ′ − σ < ϖ < ϖ′ + σ (the frequentist approach). The probability distribution within this range is not kno…
View article: The mass of the black hole in 1A 0620–00, revisiting the ellipsoidal light curve modelling
The mass of the black hole in 1A 0620–00, revisiting the ellipsoidal light curve modelling Open
The mass distribution of stellar mass black holes can provide important clues to supernova modeling, but observationally it is still ill constrained. Therefore it is of importance to make black hole mass measurements as accurate as possibl…