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Table 1.
Positions, proper motions, and separation measured by Gaia, as well as SDSS and Gaia photometry of the inner binary and the tertiary.
| Parameter | SDSS J1257+5428 | Tertiary |
|---|---|---|
| Gaia DR3 | 1570271658673389568 | 1570271757456852096 |
| Paralax [mas] | 8.32 ± 0.05 | 8.79 ± 0.72 |
| pm [mas yr−1] | 46.96 ± 0.05 | 46.93 ± 0.66 |
| pmra [mas yr−1] | −45.52 ± 0.05 | −45.59 ± 0.65 |
| pmdec [mas yr−1] | 11.45 ± 0.04 | 11.13 ± 0.68 |
| ang. sep. [arcsec] | – | 67.27902 ± 5.3 × 10−4 |
| proj. sep [au] | – | 8086 ± 49 |
| Filter | [mag] | [mag] |
| SDSS u′ | 17.365 ± 0.009 | 22.1 ± 0.19 |
| SDSS g′ | 16.840 ± 0.004 | 20.97 ± 0.04 |
| SDSS r′ | 16.740 ± 0.005 | 20.69 ± 0.03 |
| SDSS i′ | 16.725 ± 0.005 | 20.55 ± 0.04 |
| SDSS z′ | 16.76 ± 0.01 | 20.42 ± 0.15 |
| GaiaBp | 16.84 ± 0.43 | 20.82 ± 1.12 |
| GaiaG | 16.68 ± 0.15 | 20.66 ± 0.47 |
| GaiaRp | 16.41 ± 0.27 | 20.19 ± 0.65 |
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