Assessment of Earth orientation parameters from K-band VLBA sessions until 2025

• Autores: Krásná, H.; Gordon, D.; Jacobs, C.S.; de Witt, A.
• Año de publicación: 2025
• Idioma: inglés
• Tipo de recurso: documento de conferencia
• Materia: Ciencias Astronómicas; K-band VLBI; Celestial Reference Frame; Earth Orientation Parameters (EOP)
• Institución: Universidad Nacional de La Plata

The K-band Astro2Geo Very Long Baseline Interferometry project has initiated regular 24-h sessions conducted by the Very Long Baseline Array (VLBA) at 24 GHz since 2016, with the primary goal to refine the precision and accuracy of the celestial reference frame at K-band frequency. Each of the ten VLBA telescopes consists of a 25 meter parabolic dish antenna, and is strategically placed on the US territory. Therefore, the observing sessions are generally suitable for estimation of all five Earth orientation parameters (EOP). Based on our previous studies, for example, we present an update of the EOP estimates that includes the most recent K-band sessions. We carry out comparisons with EOP estimated from traditional S/X measurements divided into separate groups based on the station network geometry and project purpose. We show, that the precision of the EOP estimates from VLBA sessions observed within the K-band Astro2Geo project is comparable with astrometric USNO-CRF sessions observed with VLBA at S/X band since 2018.0. In addition, a comparison is made with the combined IERS C04 series and extensive statistics are presented.
Facultad de Ciencias Astronómicas y Geofísicas