Table 6.
Scaling factor and noise floor (in μas) applied to the estimated formal uncertainties of the source coordinates at each frequency band.
| Right ascension |
Declination |
||||
|---|---|---|---|---|---|
| Frequency | Scaling | Noise floor | Scaling | Noise floor | |
| band | factor | (μas) | factor | (μas) | |
| S/X | 1.5 | 30 | 1.5 | 30 | |
| K | 1.5 | 30 | 1.5 | 50 | |
| X/Ka | 1.0 | 30 | 1.0 | 30 | |
Notes. Inflated coordinate uncertainties are derived with the expressions 
and 
, where σα, formal and σδ, formal are the formal uncertainties in right ascension and declination (i.e., resulting from the least-squares parameter adjustment in our VLBI analysis solutions) and σα and σδ are the corresponding inflated uncertainties. The scaling factors are expressed as sα and sδ, and the noise floor as σα cos δ, 0 and σδ, 0.
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