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Lucia Plank
Type of contribution: poster

Hb-Ho: observations with the sibling telescopes in Hobart

Lucia Plank, University of Tasmania Jamie McCallum, University of Tasmania Jim Lovell, University of Tasmania David Mayer, Technische Universit{"a}t Wien Johannes B{"o}hm, Technische Universit{"a}t Wien

With the transition to VGOS, co-located radio telescopes will be common at many sites. This can be as a sibling telescope, when a VGOS antenna is built next to a legacy one or as the concept of a twin telescope, with two identical VGOS antennas. Besides a number of new observing possibilities in a network, such a configuration also allows the investigation of local effects or antenna-specific systematics. This is for example the measurement of the local baseline with VLBI and the subsequent comparison with the local tie as determined with classical surveying. The comparison of redundant observations to other antennas can be used as independent verification and identify systematic delays specific to each antenna. Lastly, co-location offers new possibilities in analysis, by combining common parameters like station positions, tropospheric conditions or clock modelling. In 2014, the two telescopes in Hobart, (12m-Hb, 26m-Ho) observed several common sessions. Besides Cont14, we also performed four dedicated twin sessions, some of them also including the antenna pair in Hartebeesthoek (15m-Ht, 26m-Hh). We report on differences we found in redundant observations, compare common parameters, determine the local baseline and its variations, and report on newly applied scheduling and analysis strategies.