نتایج جستجو برای: astrometry
تعداد نتایج: 1642 فیلتر نتایج به سال:
— General relativistic effects in astrophyiscal systems have been detected thanks to accurate astrometric measurements. We outline some keystones of astrometry such as stellar aberration (argument development during the years 1727-1872); Mercury’s perihelion precession (1845-1916); solar disk oblateness (19662001); relativistic light deflection (1916-1919); lunar geodetic precession (1916-1988)...
ASTRONOMY AND ASTROPHYSICS High precision difference astrometry applied to the triplet of S5 radio sources B1803+784/Q1928+738/B2007+777 Abstract. We determined the separations of the radio sources in the triangle formed by the BL Lac objects 1803+784 and 2007+777, and the QSO 1928+738 from in-tercontinental interferometric observations carried out in November 1991 at the frequencies of 2.3 and...
Your thesaurus codes are: ASTRONOMY AND ASTROPHYSICS The Vela pulsar proper motion revisited with HST astrometry ⋆. Abstract. Using all the HST WFC/WFPC2 images of the field collected so far, we have performed an accurate relative astrometry analysis to reassess the value of the Vela pulsar proper motion. Although covering a much shorter time span, our measurement clearly confirms the previous ...
This article intends to review the different studies of the Mars satellites Phobos and Deimos realized by means of ground-based telescopic observations as well in the astrometry and dynamics domain as in the physical one. This study spans the first period of investigations of the Martian satellites since their discovery in 1877 through the astrometry and the spectrometry methods, mainly before ...
The VLA-COSMOS large project is described and its scientific objective is discussed. We present a catalog of ∼ 3, 600 radio sources found in the 2 deg 2 COSMOS field at 1.4 GHz. The observations in the VLA A and C configuration resulted in a resolution of 1.5 ′′ ×1.4 ′′ and a mean rms noise of ∼ 10.5(15) µJy/beam in the central 1(2) deg 2. 80 radio sources are clearly extended consisting of mul...
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