Showing papers by "Royal Institute and Observatory of the Spanish Navy published in 1990"
01 Jan 1990
TL;DR: The contribution of the Carlsberg Meridian Catalogue La Palma Number 4 to the determination of the optical reference frame is discussed in this paper, which provides one of the most accurate optical reference frames at the present epoch, having a density of 1 star per square degree, and an average accuracy of 0.
Abstract: The contribution of the Carlsberg Meridian Catalogue La Palma Number 4 to the determination of the optical reference frame is discussed. This catalogue of almost 51000 stars provides one of the most accurate optical reference frames at the present epoch, having a density of 1 star per square degree, and an average accuracy of 0.″12 in position and 0.″003 per year in proper motion for stars with V 11 in the fields of benchmark extragalactic radio sources which can be used in linking the optical reference frame defined by the FK5 to the extragalactic frame.
2 citations
01 Jan 1990
TL;DR: A new micrometer has been in operation on the Carlsberg Automatic Meridian Circle since May 1988 as discussed by the authors, and the zenith mean error for one observation has improved from 0.19 to 0.8.
Abstract: A new micrometer has been in operation on the Carlsberg Automatic Meridian Circle since May 1988. The zenith mean error for one observation has improved from 0.″19 to 0.″14 and the limiting magnitude from 13m. 2 to 14m. 8. The first meridian observations of Pluto and observations of nine extragalactic objects are briefly discussed.
1 citations