منابع مشابه
Connecting VLBI and Gaia Celestial Reference Frames
The current state of the link problem between radio and optical celestial reference frames is considered. The main objectives of the investigations in this direction during the next few years are the preparation of a comparison and the mutual orientation and rotation between the opticalGaia Celestial Reference Frame (GCRF) and the 3rd generation radio International Celestial Reference Frame (IC...
متن کاملDefinition of the Celestial Ephemeris Origin and of UT 1 in the International Celestial Reference Frame ?
The adoption of the International Celestial Reference System ICRS, and of the corresponding Frame, ICRF, by the 23rd General Assembly of the International Astronomical Union, calls for a redefinition of the departure point on the true equator. Several possibilities have been suggested. This paper considers the use of the non-rotating origin (Guinot 1979). The " Celestial Ephemeris Origin " (CEO...
متن کاملVisual navigation in desert ants Cataglyphis fortis: are snapshots coupled to a celestial system of reference?
Central-place foraging insects such as desert ants of the genus Cataglyphis use both path integration and landmarks to navigate during foraging excursions. The use of landmark information and a celestial system of reference for nest location was investigated by training desert ants returning from an artificial feeder to find the nest at one of four alternative positions located asymmetrically i...
متن کاملOn accuracy assessment of celestial reference frame VLBI realizations
In this paper, we propose to use the scatter of celestial pole offset (CPO) series obtained from VLBI observations as a measure of the accuracy of the celestial reference frame (CRF) realizations. Several scatter indices (SIs) including those proposed for the first time are investigated. The first SI is based on analysis of residuals of CPO series w.r.t. Free Core Nutation (FCN) model. The seco...
متن کاملOn recent discovery of new planetoids in the solar system and quantization of celestial system
The present note revised the preceding article discussing new discovery of a new planetoid in the solar system. Some recent discoveries have been included, and its implications in the context of quantization of celestial system are discussed, in particular from the viewpoint of superfluid dynamics. In effect, it seems that there are reasons to argue in favor of gravitation-related phenomena fro...
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ژورنال
عنوان ژورنال: International Astronomical Union Colloquium
سال: 1980
ISSN: 0252-9211
DOI: 10.1017/s0252921100081422