Table 1
Observational geometry and instrument settings.
| UT Date | Telescope/instrument | Mode | Filter | Exptime | N | rh | Δ | α | Airmass |
|---|---|---|---|---|---|---|---|---|---|
| 2017-02-19.43 | NHAO/MALLS | spec | WG320 | 600 | 1 | 0.58 | 1.00 | 71.3 | 2.5 |
| 2017-02-19.43 | IAO/MITSuME | image | g′, RC, IC | 60 | 6 | 0.58 | 1.00 | 71.3 | 2.6 |
| 2017-02-21.42 | OAO/MITSuME | image | g′, RC, IC | 120 | 9 | 0.54 | 0.97 | 75.7 | 3.0 |
| 2017-02-21.41 | HHO/HONIR | sppol | OPT | 90 | 20 | 0.54 | 0.97 | 75.7 | 2.7 |
Notes. Top headers: Exptime, individual exposure time in seconds; N, number of exposures; rh, median heliocentric distance in au; Δ, median geocentric distance in au; α, median phase angle in degrees. “image”, “spec”, and “sppol” stand for the imaging, spectroscopic, and spectropolarimetric instrumental settings (mode), respectively. The web-based JPL Horizon system (http://ssd.jpl.nasa.gov/?horizons) is referred to for the ephemerides. WG320 and OPT are names of the cut filters we employed, ensuring the available spectra at wavelengths of 0.50–0.73 μm and of 0.50–1.00 μm, respectively.
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