Table 1.
Journal of the observations: imaging.
| Telescope/Instrument | Date (UT) | r | Δ | α | Scale |
|---|---|---|---|---|---|
| (au) | (au) | (deg) | arcsec/pixel | ||
| TCS/MuSCAT2 | 2019-01-11T02:43 | 2.464 | 1.822 | 20.3 | 0.434 |
| GTC/OSIRIS | 2019-01-13T06:56 | 2.460 | 1.794 | 19.8 | 0.254 |
| GTC/OSIRIS | 2019-01-14T06:12 | 2.458 | 1.781 | 19.7 | 0.254 |
| TRAPPIST-S | 2019-01-21T00:11 | 2.444 | 1.699 | 18.1 | 1.250 |
| TRAPPIST-S | 2019-01-29T05:36 | 2.428 | 1.608 | 15.9 | 1.250 |
| TRAPPIST-S | 2019-02-05T02:45 | 2.414 | 1.541 | 13.7 | 1.250 |
| TRAPPIST-S | 2019-02-07T07:22 | 2.410 | 1.523 | 12.9 | 0.625 |
| SOAR | 2019-02-15T06:37 | 2.394 | 1.463 | 10.1 | 0.290 |
| TRAPPIST-S | 2019-03-05T05:34 | 2.356 | 1.388 | 6.9 | 0.625 |
| TRAPPIST-S | 2019-03-13T04:48 | 2.338 | 1.384 | 8.8 | 0.625 |
Notes. Telescope/Instrument acronyms: TCS: 1.52 m Carlos Sánchez Telescope. MuSCAT2: Multi-color Simultaneous Camera for Studying Atmospheres of Transiting Planets. GTC: 10.4 m Gran Telescopio Canarias. OSIRIS: Optical System for Imaging and low-Intermediate-Resolution Integrated Spectroscopy. TRAPPIST: 0.6 m Transiting Planets and Planetesimals Small Telescope. SOAR: 4.1 m Southern Astrophysical Research Telescope. The geocentric and heliocentric distances of the asteroid are denoted by Δ and r, respectively, and α is the phase angle.
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