Table 1
New astrometric measurements of the GG Tau A binary.
| Obs. date | Instrument | Filter | Nimg × Ncoadd × tint (s) | Sep. (″) | PA(°) | Prog. ID & PI/Ref. |
|---|---|---|---|---|---|---|
| 2010-12-09 | Keck/NIRC2 | Brγ | 1 × 1 × 0.2 | 0.2522 ± 0.0007 | 332.05 ± 0.11 | U146N2L, A. Ghez |
| 2011-12-16 | Keck/NIRC2 | Brγ | 9 × 30 × 0.4 | 0.2536 ± 0.0007 | 330.88 ± 0.20 | U054N2L, J.-L. Margot |
| 2012-10-29 | Keck/NIRC2 | K′ | 9 × 30 × 0.181 | 0.2558 ± 0.0005 | 329.55 ± 0.25 | H205N2L, J.Lu |
| 2012-12-06(†) | VLT/NaCo | Ks | (…) | 0.2558 ± 0.0035 | 329.3 ± 0.8 | Di Folco et al. (2014) |
| 2014-12-11 | Keck/NIRC2 | K′ | 9 × 30 × 0.181 | 0.2579 ± 0.0005 | 327.48 ± 0.11 | H233N2L, J.Lu |
| 2017-12-19 | VLT/NaCo | Ks | 101 × 1 × 1.0 | 0.2557 ± 0.0004 | 323.37 ± 0.10 | 0100.C-0055, R. Köhler |
| 2019-10-13 | Keck/NIRC2 | Brγ | 10 × 20 × 0.2 | 0.2553 ± 0.0005 | 319.55 ± 0.10 |
Notes. The fourth column lists the number of independent individual images, the number of individual frames co-added per image, and the individual integration time. No program ID or PI is listed in the Keck Observatory Archive for the last dataset. The(†) Symbol indicates the astrometric measurement from Di Folco et al. (2014), reported here for completeness.
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