Table 1.
Keck LGS AO relative astrometry and photometry of WISEP J101905.63+652954.2.
| Epoch (MJD) | Filter | Separation (mas) | PA (deg) | Δm (mag) |
|---|---|---|---|---|
| 57037.5382 | J | 416 ± 7 | 161.5 ± 0.6 | 0.37 ± 0.06 |
| 57037.5246 | CH4s | 423.1 ± 0.6 | 161.72 ± 0.12 | 0.489 ± 0.019 |
| 59603.5270 | J | 467.2 ± 1.1 | 166.78 ± 0.12 | 0.494 ± 0.021 |
| 59603.5218 | CH4s | 467 ± 3 | 166.82 ± 0.18 | 0.48 ± 0.03 |
| 59603.5174 | H | 468.7 ± 0.7 | 166.97 ± 0.10 | 0.579 ± 0.013 |
Notes. The error bars given here are the standard deviation of individual measurements and they do not account for the 1.5 mas systematic error on the absolute astrometric reference frame of NIRC2 due to the optical distortion correction for such a wide binary. Relative photometry is given as the difference in magnitude Δm ≡ mB − mA.
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