Výsledky vyhledávání - "R. L. Duncombe"

Astrometry with the HST Planetary Camera

Autor: T. M. Girard, Y. Li, W. F. Van Altena, J. M. Nunez, G. F. Benedict, R. L. Duncombe, P. D. Hemenway, W. H. Jefferys, B. McArthur, J. McCartney, E. Nelan, P. Shelus, D. Story, A. L. Whipple, O. G. Franz, L. W. Wasserman, L. W. Fredrick

Publikováno v: Symposium - International Astronomical Union. 166:101-106

The astrometric capability of the Hubble Space Telescope Planetary Camera (WF/PC1) is investigated, motivated by a study of the internal velocity distribution of globular clusters. The astrometric accuracy of the HST PC will be determined ultimately

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::05a126938919707626eb635baede40c0
https://doi.org/10.1017/s0074180900227927

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Interferometric Astrometry with Hubble Space Telescope Fine Guidance Sensor 3:The Parallax of the Cataclysmic Variable TV Columbae

Autor: B. E. McArthur, G. F. Benedict, J. Lee, W. F. van Altena, C. L. Slesnick, J. Rhee, R. J. Patterson, L. W. Fredrick, T. E. Harrison, W. J. Spiesman, E. Nelan, R. L. Duncombe, P. D. Hemenway, W. H. Jefferys, P. J. Shelus, O. G. Franz, L. H. Wasserman

TV Columbae (TV Col) is a 13th magnitude Intermediate Polar (IP) Cataclysmic Variable (CV), with multiple periods found in the light curves. Past estimates predicted a distance of 400 parsec to greater than 500 parsec. Recently completed Hubble Space

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::996595e52f4272e9c8780a0d02175048

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Observations of Mars 1950-1976 Compared to Ephemerides

Autor: P. K. Seidelmann, R. L. Duncombe, Y. Kubo

Publikováno v: Symposium - International Astronomical Union. 81:121-127

The present basis for the ephemeris of Mars in the National Ephemerides is the theory of S. Newcomb (1898) as amended by the corrections of Ross (1917). These amendments by Ross, however, are empirical in nature and therefore the present ephemeris of

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::74f1e7cfc0d41143b685a5d32620ec66
https://doi.org/10.1017/s0074180900012614

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Planetary Ephemerides

Autor: R. L. Duncombe, P. K. Seidelmann, P. M. Janiczek

Publikováno v: Highlights of Astronomy. 3:223-227

At the present time the planetary ephemerides in the Astronomical Ephemeris and in the American Ephemeris and Nautical Almanac (both hereinafter referred to as the AE), the Astronomical Ephemeris of the U.S.S.R. and most other national almanacs have

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::139b708dd26c1df41ccaecf3d053b32e
https://doi.org/10.1017/s1539299600001933

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Planetary Theories and Observational Data

Autor: R. L. Duncombe, P. K. Seidelmann

Publikováno v: International Astronomical Union Colloquium. 41:3-14

A brief review is given of planetary theories from Leverrier to Newcomb to the age of computers. The presently used planetary theories are discussed and the process of replacing these theories with new ones is described. Some difficulties in preparin

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https://doi.org/10.1017/s0252921100062060

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4. Ephemerides

Autor: T Lederle, B L Morando, V K Abalakin, S Aoki, R L Duncombe, J H Lieske, A Orte, P K Seidelmann, A M Sinzi, G A Wilkins, B D Yallop

Publikováno v: Transactions of the International Astronomical Union. 19:1-6

The period of this Report includes 1984 January 1, the date which was probably the most drastic caesura in the history of astronomical almanacs. It seemed, therefore, appropriate to concentrate here to the general aspects rather than to describe the

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::519e6fbadc3638deacfe459587ea632a
https://doi.org/10.1017/s0251107x00006052

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The New UTC Time Signals

Autor: R. L. Duncombe, P. K. Seidelmann

Publikováno v: Navigation. 24:160-165

beginning januaey 1, 1972, the standard time signal broadcasts no longer give directly the rotational position of the Earth to an accuracy of 1/10 of a second of time, as had been done previously. Instead the new UTC Time Signals may depart from the

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c03f4101228b719941644893b9ea50c4
https://doi.org/10.1002/j.2161-4296.1977.tb01279.x

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4. Ephemerides

Autor: A M Sinzi, T Lederle, V K Abalakin, S Aoki, R L Duncombe, J H Lieske, B L Morando, A Orte, P K Seidelmann, G A Wilkins, B D Yallop

Publikováno v: Transactions of the International Astronomical Union. 18:1-13

Because of unforeseen difficulties, Dr Sinzi, President of the Commission, was not able to prepare this Report. It was then too late for asking the Directors of the almanac offices and the other Members of the Commission for informations. This Report

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f1df6a1d79a6d5191bb9b70dd7dd8836
https://doi.org/10.1017/s0251107x00004429

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