Zobrazeno 1 - 10
of 43
pro vyhledávání: '"E. H. Geyer"'
Publikováno v:
Astronomy and Astrophysics Supplement Series. 127:479-495
Multislit spectra of comet P/Halley were ob- tained on April 10, 1986, using a focal reducer with a eld of 0:5 angular diameter. The number and ar- rangement of the slits allowed a reconstruction of the spa- tial distribution of principal neutral and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2fb447581107ee786f36d149f35a1fcf
https://doi.org/10.1051/aas:1998115
https://doi.org/10.1051/aas:1998115
Autor:
T. Kwiatkowski, L. Jorda, Anders Erikson, E. Dotto, C. Blanco, W. Pych, F. P. Velichko, L. Sarounova, G. De Angelis, V. Ivanova, P. Denchev, Petr Pravec, Uwe Fink, Agnieszka Kryszczyńska, M. Dahlgren, M. Di Martino, N. M. Gaftonyuk, J.D. Drummond, Robert J. Whiteley, Wieslaw Z. Wisniewski, Walter J. Wild, R. P. Binzel, E. H. Geyer, William M. Grundy, J.F. Lahulla, Marek Wolf, Boris Komitov, P. Magnusson, Z. Donchev, D. F. Lupishko, Stefano Mottola, Michael J. Hoffmann, T. Bauer, Stephen M. Slivan, O. Mendez, David J. Tholen, Vasilij G. Chiorny, D. Riccioli, Yu. N. Krugly, François Colas, Maria Antonietta Barucci, Steven J. Ostro, Bonnie J. Buratti, Vasilij G. Shevchenko, Javier Licandro, J. Berthier, Michael D. Hicks
Publikováno v:
Icarus. 123:227-244
Photometric observations of 1620 Geographos in 1993 and 1994 are presented and, in combination with previously published data, are used to derive models of Geographos. We estimate that the sidereal period of rotation is 0.21763860 ± 0.00000003 days
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e55ccb35fa34ed968f58b834d9255e32
https://doi.org/10.1006/icar.1996.0151
https://doi.org/10.1006/icar.1996.0151
Publikováno v:
Astrophysics and Space Science. 239:259-274
For observations of solar system objects an imaging polarimeter has been constructed as an auxiliary instrument for a f/15 focal reducer. With this instrument simultaneous measurement of theQ andU Stokes parameters is possible. It contains no moving
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f2c92908c1860c4a8c213d8e05a2a665
https://doi.org/10.1007/bf00645780
https://doi.org/10.1007/bf00645780
Autor:
Daniela Lazzaro, Jack D. Drummond, David J. Tholen, F. P. Velichko, G. De Angelis, M. Gonano-Beurer, E. H. Geyer, Tadeusz Michalowski, R. P. Binzel, P. Magnusson, C. A. Angeli, Kari Lumme, Stefano Mottola, Michael J. Hoffmann, M. Di Martino, Stephen M. Slivan, E. Dotto, Wieslaw Z. Wisniewski, M. A. Barucci
Publikováno v:
Icarus. 105:310-325
Groundbased photometric observations of asteroid 243 Ida over seven apparitions from 1980 to 1993 allow us to derive a model for its spin vector and shape prior to the August 1993 encounter by the Galileo spacecraft. Two equally likely solutions for
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::965f46a46daa19fd3af8c4d9d559625a
https://doi.org/10.1006/icar.1993.1129
https://doi.org/10.1006/icar.1993.1129
Autor:
R. Müller, E. H. Geyer
Publikováno v:
Astronomische Nachrichten: A Journal on all Fields of Astronomy. 314:49-67
With this paper we present the mathematical background for a novel method for the deconvolution of longer exposed double star images, merged by seeing and other effects. This method, which was recently presentcd in a short paper (Muller and Geyer 199
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d04b0f4abe98fe91b05213cda0637c2d
https://doi.org/10.1002/asna.2113140202
https://doi.org/10.1002/asna.2113140202
Autor:
B. Nelles, E. H. Geyer
Publikováno v:
Applied optics. 20(4)
The basic theory of off-axis distortion and dispersion errors of grating-prisms is given. it is used to determine steller radial velocities according to the reversion method with slitless grating-prism field spectrographs.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ee0bf11341697564f03fa2f1bfedd9e5
https://pubmed.ncbi.nlm.nih.gov/20309174
https://pubmed.ncbi.nlm.nih.gov/20309174
Publikováno v:
Icarus. 95:211-221
Comet Wilson (1986l) was observed with the MPAE/Hoher List focal reducer-based CCD camera and grism spectrometer having spectral resolution of 4.9 A per pixel, coupled to the ESO 1-m reflector. The data base consists of six long slit spectra, one of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4a7d9d2b345753adf463bdec5cab640c
https://doi.org/10.1016/0019-1035(92)90038-9
https://doi.org/10.1016/0019-1035(92)90038-9
Autor:
E. H. Geyer, M. Hoffmann
Publikováno v:
Earth, Moon and Planets. 52:83-86
Observations of the occultation of 28 Sgr by Titan are presented. Apparently being located close to the central line of the occultation track, a double peaked central flash was observed. Some characteristic times of the phenomenon are given.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c018e3534d0adf0a2b17fe9a275e39ef
https://doi.org/10.1007/bf00113833
https://doi.org/10.1007/bf00113833
A century of observations of omega Centauri allows us to accurately follow the period changes of a large sample of variable stars. Although the period changes are composed of monotone and irregular changes, period increases dominate in most of the RR
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d80f83d69f16cd988b2ca934f074cd99
Autor:
E. H. Geyer, Thilo Bauer
Publikováno v:
SPIE Proceedings.
With the combination of a grism and a Kosters interference prism not only a beam doubling but also a reversion of the dispersion direction is achieved. With this principle a new type of an astronomical radial velocity spectrograph was designed. With
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d4441d433b00bd763492de4b423cc046
https://doi.org/10.1117/12.187597
https://doi.org/10.1117/12.187597