Table 1
Observational geometry and instrument settings.
| Median UT | Telescope/ | Mode | N | Exptime | X | mV | rH | Δ | α | ν |
|---|---|---|---|---|---|---|---|---|---|---|
| 2016+ | Instrument | (s) | (mag) | (au) | (au) | (°) | (°) | |||
| Jan. 12 07:00 | VLT/FORS2 | PMOS/300V | 2 | 2240 | 1.57 | 15.951 | 2.107 | 1.574 | 26.24 | 92.84 |
| (1.44–1.70) | ||||||||||
| Feb. 04 05:41 | 2400 | 1.52 | 16.267 | 2.283 | 1.496 | 18.47 | 99.56 | |||
| (1.41–1.63) | ||||||||||
| Mar. 04 08:42 | 2400 | 1.74 | 16.800 | 2.502 | 1.528 | 5.49 | 106.73 | |||
| (1.61–1.97) |
Notes. Top headers: mode, instrumental settings of spectropolarimetry observation (PMOS) with the grism filter (300V); N, number of a pair of one set of exposures; Exptime, total exposure time in seconds; X, mean airmass with the range in airmass in parentheses; mV, apparent total (nucleus + coma) V -band magnitude provided by the NASA/JPL Horizons system; rH and Δ, median heliocentric and geocentric distances in au, respectively; α, median phase angle (angle of Sun–comet–observer) in degrees; and ν, median trueanomaly in degrees.
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