NEWS
Paper on the evaluation of satellite observations with VLBI published
Paper on Southern Intensives for UT1 determination published
The need for stimulating global geodetic measurements with southern observatories served as a powerful motivation to launch the Southern Intensive (SI) program in 2020. The competitiveness of these SI sessions with routinely operated Intensive sessions has now been demonstrated in a paper published in Earth, Planets and Space.
Dr.-vlbi Jakob Gruber
On June 30, 2022, Jakob Gruber successfully defended his PhD thesis on Raw Data Simulation and Correlation of VLBI data. After the presentation of his thesis, Jakob withstood the difficult questions from Axel Nothnagel, Jamie McCallum and Johannes Böhm. Congratulations and thanks for the nice party in Hof3! @tu_wien @geodepartment @j_boehm72
Excursion to the Geodetic Observatory Wettzell
On June 20, the excursion to the Geodetic Observatory Wettzell organised by the Vienna VLBI Group took place. This year, 34 students and 7 staff members participated in the trip to the Bavarian Forest. At the observatory, we were able to inspect three VLBI antennas, two SLR/LLR systems, many GNSS antennas and a DORIS beacon. Moreover, we were able to get insight information on the on-site ring laser and additional telescopes observing the space weather.
Vienna VLBI Group at EGU 2022
- Characteristics and results of two years of a VLBI southern hemisphere intensive observing program (Sigrid Böhm et al.)
- Precision of Galileo satellite orbits obtained from simulated VLBI observations (Helene Wolf et al.)
- Impact of erroneous station coordinates on the estimation of UT1-UTC with VLBI Intensive sessions (Lisa Kern et al.)
Seminar on jet precession in VLBI data by Michal Zajaček
On September 30, 2021, Michal Zajaček from the Masaryk University in Brno visited TU Wien and gave a seminar talk on short-term jet precession in VLBI data. It was very interesting to see where astrophysics and geodesy have common topics and goals.
First IVS VGOS session successfully correlated at TU Wien
For the first time, a 24h VGOS session of the International VLBI Service for Geodesy and Astrometry (IVS) was correlated at TU Wien. Eight globally distributed radio telescopes participated in session VO1021 on January 21, 2021, each observing quasars with a data rate of 8 Gbit/s. In total, more than 220 TByte had to be e-transferred to Vienna before being processed on the Vienna Scientific Cluster 4. The session fit of the finally used 11 thousand observations was 20 picoseconds.
New software to simulate raw telescope data for VLBI
Jakob Gruber has developed software to simulate raw telescope data for VLBI (VieRDS). Interested? The software is available via Github and the description with the mathematical background has just gone online as open access paper. @IVS_OOC
Paper on ICRF3 published in A&A
What a nice Christmas present: the paper on the ICRF3 is finally published in A&A: https://doi.org/10.1051/0004-6361/202038368 . Wien is very happy and honored to have been part of this great achievement! @IVS_OOC @tu_wien
IVS Newsletter online
Do not miss the December 2020 issue of the IVS Newsletter! @IVS_OOC It features the Celestial Reference Frame with great interviews by “CRF veterans”. It also introduces the joint Operation Center by Wettzell, Zürich, and Wien. https://ivscc.gsfc.nasa.gov/publications/newsletter/issue58.pdf