High precision astrometry with closure constraints: The triplet 1803+784/1928+738/2007+777

Autor:	J. M. Marcaide, Thomas P. Krichbaum, Robert A. Preston, A. Witzel, M. I. Ratner, Irwin I. Shapiro, Eduardo Ros, J. C. Guirado
Rok vydání:	1997
Předmět:	Physics Sky media_common.quotation_subject Very-long-baseline interferometry Closure (topology) Astronomy and Astrophysics Ranging Astrometry Astrophysics Differential (mathematics) media_common Computational physics
Zdroj:	Vistas in Astronomy. 41:207-211
ISSN:	0083-6656
DOI:	10.1016/s0083-6656(97)00007-x
Popis:	Improvements in the technique of high precision differential astrometry in VLBI based on the use of triangles of radio sources are reported. Such geometry provides new constraints by taking advantage of “closure”. Results on the relative separations (ranging from 4.6 to 6.8°) of the sources in the triangle 1803+784/1928+738/2007+777 from ionosphere-free delays are shown and “sky closure” verified. A comparison with previous results on the pair 1928+738/2007+777 is also presented.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::f4bd32e37947db8f5b4de9cc8f4374ab https://doi.org/10.1016/s0083-6656(97)00007-x Zobrazit plný text záznamu Full Text from ScienceDirect