Table 1.
The journal of our observations
| Median UT | N | n | T tot | r h | Δ | α | P | P err | P r | P r,err | θ r | θ r,err | θ P | θ P,err | Airmass |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2016-09-15.476 | 16 | 4 | 32.00 | 0.780 | 0.451 | 106.5 | 50.0 | 1.1 | 49.8 | 1.1 | −2.6 | 0.6 | 77.0 | 0.6 | 4.888–6.336 |
| 2016-09-17.708 | 28 | 7 | 72.00 | 0.824 | 0.436 | 101.3 | 48.1 | 0.7 | 48.0 | 0.7 | −1.4 | 0.4 | 77.8 | 0.4 | 5.040–2.250 |
| 2016-09-24.619 | 14 | 3 | 22.75 | 0.950 | 0.407 | 85.4 | 35.6 | 0.4 | 35.6 | 0.4 | −2.7 | 0.3 | 79.2 | 0.3 | 2.438–2.240 |
| 2016-10-04.675 | 24 | 6 | 36.00 | 1.114 | 0.411 | 63.4 | 20.4 | 0.2 | 20.4 | 0.2 | −1.9 | 0.2 | 1.0 | 0.2 | 1.491–1.541 |
| 2016-10-07.636 | 48 | 12 | 58.00 | 1.159 | 0.423 | 57.7 | 15.9 | 0.1 | 15.8 | 0.1 | −2.6 | 0.2 | 24.2 | 0.2 | 1.216–1.735 |
| 2016-11-07.485 | 23 | 5 | 46.00 | 1.549 | 0.779 | 33.0 | 3.5 | 0.6 | 3.5 | 0.6 | 2.5 | 5.3 | 4.5 | 5.3 | 1.013–1.200 |
N: total number of exposures, n: total number of exposure sets, Ttot: total exposure time (minutes), rh: heliocentric distance of Phaethon (au), Δ: geocentric distance of Phaethon (au), α: solar phase angle (degree), P: polarization degree of Phaethon (%), Perr: error of P (%), Pr: polarization degree with respect to the scattering plane (%), Pr,err: error of Pr (%), θr: position angle with respect to the scattering plane defined in Eq. (11) (degree), θr,err: error of θr (degree), θP : position angle of the strongest electric vector in degrees (degree), θP,err: error of θP (degree), airmass: range of airmass during the night
Basically n = N/4, but for some reason (sky situation or hardware malfunction), we have n < N/4 for two nights. See 00README.txt on figshare online digital repository that we mentioned in the Data availability section for more details. The airmass values are calculated from elevation angle using the airmass function implemented in IRAF. See Code availability section for more details about IRAF