Search Publications

Assigning WCS Standards to Rozhen Fits Archive. Preliminary Tests

Borisov, G.; Stanchev, O.

Assigning physical coordinates to FITS image pixels is important to standardize the Rozhen fits files. Among wide spread WCS software available, here we present tests based on the IDL implementation of the WCS standards. Our goal is to apply this implementation for calculating and adding the necessary WCS FITS keywords in the image headers. The ob…

Wide-Field Plates Observations of Stars from Earth Orientation Catalogs (EOC)

Vondrak, J.; Ron, C.; Chapanov, Y. +3 more

The Earth Orientation Catalogues (EOCs) are primarily meant to provide stable celestial reference frame in optical wavelengths for deriving Earth Orientation Parameters (EOP) from astrometric observations. The EOCs combine catalogues ARIHIP and TYCHO-2 with the rich observation material (variations of Latitude/Universal Time), obtained during the …

New Solution of Earth Orientation Parameters 1900-1992 from Optical Astrometry, and its Linking to ICRF and ITRF

Vondrak, J.; Ron, C.; Stefka, V. +1 more

In preceding years we collected and re-analyzed the optical astrometry data from 33 observatories, using a unique celestial reference frame. It was realized first by the Hipparcos Catalogue, and then by a group of our own Earth Orientation Catalogs (EOC), being obtained by combining Hipparcos/Tycho data with older ground-based observations. EOC ca…