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Table 2.
Impact of alternate analysis configurations on the estimated radio source coordinates at S/X band.
| Elements of variations | Δα cos δ |
Δδ |
||
|---|---|---|---|---|
| rms |  |
rms |  |
|
| (μas) | (μas) | |||
| Elevation angle cutoff (a) | ||||
| > 7° | 6 | 0.06 | 8 | 0.07 |
| > 10° | 10 | 0.18 | 14 | 0.20 |
| > 15° | 16 | 0.36 | 22 | 0.38 |
| Zenith tropospheric delays (b) | ||||
| 20 min intervals | 10 | 0.23 | 12 | 0.21 |
| 1 hr intervals | 11 | 0.15 | 15 | 0.15 |
| 3 hr intervals | 11 | 0.15 | 15 | 0.15 |
| Special handling sources | ||||
| coordinates per session | 13 | 0.38 | 9 | 0.13 |
| Session-based antenna | ||||
| positions | 8 | 0.11 | 11 | 0.14 |
Notes. The observed variations are characterized by the rms scatter (in microarcseconds) and reduced chi-squared for right ascension (Δα cos δ) and declination (Δδ).
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