Optical Reference Frame Defined by Carlsberg Meridian Catalogue La Palma Number 4

Abstract

ABSTRACT. The contribution of the Carlsberg Meridian Catalogue La PalmaNumber 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"l2 in position and 0"003 per year in proper motion for stars with V<9. The catalogue also contains positions of reference 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.

On the Precision of Star Positions Observation Made with the Pulkovo HMC.

“…where η is the average number of observations for single star. The accuracy of the HMC observations is nearly the same as that of the CAMC observations and of the PMC observations (Morrison et al (1990), Yoshizawa et al (1989), Yoshizawa et al (1992)). The HMC accuracy of declination determination is high, but that of the right ascension determination is somewhat lower.…”

“…In this Fig. are visualised also the comparisons with the differences of considered catalogues with respect to the FK5 system among the Tokyo FMC86^88 (Yoshizawa et al 1992), CAMC86 (Morrison et al 1990), and Bordeaux86 (Morrison, Argy le et al 1990). All four catalogues show similar coincidence and good agreement of the mean variations with the accuracy of the mean error level of about 0.02 or 0.03 (Yoshizawa et al 1989).…”