Zobrazeno 1 - 10
of 16
pro vyhledávání: '"Hans Betlem"'
Publikováno v:
Astronomy and Astrophysics
Astronomy and Astrophysics, 428, 683-690
Astronomy and Astrophysics, 428, 683-690
Double station data on 496 meteors belonging to several meteor showers were obtained within the program of the video meteor observations during years 1998-2001. Analyzed meteors cover a range of photometric masses from 10 -7 to 10 -4 kg with a corres
Publikováno v:
The Institute of Space and Astronautical Science report. S.P. : Proceedings of the 2002 International Science Symposium on the Leonid Meteor Storms. 15:47-53
During the high activity of the Leonid meteor shower on the night 2000 November17./18., the observations were carried out by an international team in Spain. The results of thedouble station video experiment are presented here. Almost 400 meteors were
Publikováno v:
Meteoritics & Planetary Science. 35:1109-1115
— In this paper, we study the extremely high beginning parts of atmospheric trajectories of seven Leonid meteors recorded by sensitive TV systems equipped with image intensifiers up to apparent magnitude +6.5. For all seven cases, we observed comet
Autor:
Peter Jenniskens, Hans Betlem
Publikováno v:
The Astrophysical Journal. 531:1161-1167
There is a subpopulation of Leonid meteoroid stream particles that appear to form a region of enhanced numbers density along the path of the stream. This structure has been detected in the vicinity of the parent comet, and its variation from one appa
Publikováno v:
Meteoritics & Planetary Science. 35:243-249
Precise atmospheric trajectories including dynamic and photometric data on thirteen of the brightest Leonid fireballs have been determined from the double-station photographic observations of Leonid meteors during the ground-based expedition to China
Autor:
Hans Betlem, Carl Johannink, C. Ter Kuile, J. van't Leven, HB Zhao, GY Li, Peter Jenniskens, J. Zhu, CM Lei, S Evans, P Spurny
Publikováno v:
Meteoritics & Planetary Science. 34:979-986
Seventy-five orbits of Leonid meteors obtained during the 1998 outburst are presented. Thirty-eight are precise enough to recognize significant dispersion in orbital elements. Results from the nights of 1998 November 16/17 and 17/18 differ, in agreem
Autor:
Peter Jenniskens, T. Rice, M. de Lignie, J. van 't Leven, M. Koop, Hans Betlem, M. van Vliet, C. Ter Kuile, E. Morales
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 301:941-954
We present the first measurements of the radiant and orbit of meteoroids that are part of the unusual Perseid activity called the ‘Perseid Filament’. This filament was encountered by Earth in the years before and after the return of the comet to
Autor:
Koen Miskotte, J. van't Leven, M. de Lignie, Peter Jenniskens, Klaas Jobse, Hans Betlem, C. Ter Kuile
Publikováno v:
Astronomy and Astrophysics Supplement Series
Astronomy and Astrophysics Supplement Series, 128, 179-185. EDP Sciences
Astronomy and Astrophysics Supplement Series, 128, 179-185. EDP Sciences
359 precisely reduced meteor orbits are presented that are the result of the Dutch Meteor Society's Photographic Meteor Survey in the period 1981 until 1993. Orbits include those of major and minor showers, doubling the number of known precise orbits
Autor:
P. Spurny, Juergen Oberst, J. Rendtel, C. Gritzner, Dieter Heinlein, S. Molau, Z. Ceplecha, M. Schindler, Hans Betlem
Publikováno v:
Meteoritics & Planetary Science. 33:49-56
Among the three large camera networks Fireball Netcarrying out fireball observations through the seventies and eighties, the "European work" is the last one still in operation. The network today consists of more than 34 all-sky and fish-eye cameras d
Autor:
Hans Betlem, Jiří Borovička
Publikováno v:
Planetary and Space Science
Planetary and Space Science, 45, 563-575
Planetary and Space Science, 45, 563-575
Spectra of two bright ( −11 mag) Perseid meteors are studied. Monochromatic light curves are constructed and the spectra are analyzed at selected points along the trajectory. The shift of maxima of low excitation iron lines down the trajectory in m