Table 4
Fitted disk centroid positions.
| Object | Telescope | Epoch | α | δ | Δα, Δδ | p.m. (α) | p.m. (δ) |
| (UT) | (J2000.0) | (J2000.0) | mas | mas/yr | mas/yr | ||
|
|
|||||||
| AS 209 | – | 2000.0 | 16 49 15.30324 | −14 22 08.6346 | – | −7.69 | −22.84 |
| SMA | 2006-05-12 | 16 49 15.282 | −14 22 08.77 | 0.005 | |||
| CARMA | 2009-12-10 | 16 49 15.303 | −14 22 08.853 | 0.005 | |||
| VLA | 2011-05-20 | 16 49 15.298 | -14 22 08.914 | 0.005 | |||
| DR Tau | – | 2000.0 | 04 47 06.209 | +16 58 42.81 | – | 12.6 | −17.1 |
| CARMA | 2011-12-06 | 04 47 06.219 | +16 58 42.711 | 0.002 | |||
| VLA | 2012-08-08 | 04 47 06.217 | +16 58 42.652 | 0.006 | |||
| FT Tau | – | 2000.0 | 04 23 39.193 | +24 56 14.11 | – | 10.3 | −21.4 |
| CARMA | 2008-10-15 | 04 23 39.193 | +24 56 14.003 | 0.002 | |||
| VLA | 2011-03-28 | 04 23 39.196 | +24 56 13.977 | 0.004 | |||
Notes. For each object we give the astrometric coordinates at the reference Epoch 2000.0 with proper motion estimates from SIMBAD. For each interferometric dataset we give the coordinate of the disk center derived from the fit, with the estimated errors (Δα and Δδ are found to be approximately equal). These are the formal uncertainties of the fitting process and do not account for the uncertainties introduced by the phase calibration (position accuracy of the calibrator and potentially uncorrected phase offsets); we estimate that they contribute at the 0.1′′ level for our observations.
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