Time series of VLBI radio source positions at K-band
vie_k_250819 solution

1. Frequency band: K

2. Origin of input data 
Astro2Geo project, K band VLBA

3. Authentic post-processing and calibration steps after data retrieval


4. Origin of meteorological data: database content, GPT3 as backup

5. Software used for analysis: VieVS

6. Instrumental calibration
   - Origin of cable cal data: database content
   - Application of cable cal flags: individual setting for each database, no cable cal for VLBA since 2018-Mar-04

7. Atmospheric propagation
   - Ionospheric correction: GIM from CODE
   - Numerical weather model used: 
   - Troposphere mapping function: VMF3
   - A priori mean tropospheric gradients: DAO

8. Earth orientation
   - A priori precession/nutation model: IAU2000A precession-nutation, IAU2006 precession model
   - A priori short-period tidal variations in X, Y and UT1: IERS Conventions 2010

9. Station positions
   - A priori station positions and velocities: ITRF2020-u2023
   - Solid Earth tides: IERS Conventions 2010
   - Ocean loading displacements: TPXO72
   - Atmospheric loading displacements: VIE
   - Permanent tide correction: IERS Conventions 2010
   - Ocean pole tide displacements: IERS Conventions 2010
   - Antenna thermal deformations: antenna-info.txt, Nothnagel, Version of 2022-07-19
   - Antenna gravitational deformations: Gipson, Version 2023-01-24
   - Antenna axis offsets: antenna-info.txt, Nothnagel, Version of 2022-07-19

10. Source coordinates
   - Apriori source coordinates: ICRF3sx
   - Amplitude of Galactocentric acceleration vector: 5.8 uas/yr
   - Epoch of coordinates: 2015.0
   
11. Parameterization
   - Clocks: PWLO 60 min, 1 rate, 1 quadratic term
   - Troposphere
      + Zenith wet delays: PWLO 30 min
      + Gradients: PWLO 3 h
   - Earth orientation: PWLO, ERP at 0 UTC, nutation for the middle of the session
   - Station positions and velocities: position estimated, velocities fixed
   - Antenna axis offsets: fixed
   - Source coordinates: sources in the .ts file estimated, sources from Group1* or Group2* were fixed
   - BCO: for larger than 3 sigma

12. Constraints
   - Orientation of the celestial reference frame: sources from Group1* or Group2* fixed to ICRF3sx
   - Origin and orientation of the terrestrial reference frame: NNT/NNR on pos w.r.t. ITRF2020-u2023

13. Outlier elimination: according to database settings + individual treatment of databases

14. Additional information

*Group1 -  missing ICRF3sx defining sources in vie-k-250819a.ts (i.e. about half of the ICRF3sx defining sources)
*Group2 -  missing ICRF3sx defining sources in vie-k-250819b.ts

Difference between vie-k-250819a and vie-k-250819b: sources from Group1 and Group2 were fixed.