Table 1
Observation log of comet C/2013 X1 (PANSTARRS).
| Date, UT | rh (au(a)) | Δ (au(b)) | α (deg(c)) | ψ (deg(d)) | −υ (deg(e)) | Texp, s(f) | N(g) |
|---|---|---|---|---|---|---|---|
| 2015-12-05 | 2.332 | 1.539 | 17.8 | 92.96 | 67.65 | 60/60/60 | 9/9/9 |
| 2015-12-06 | 2.322 | 1.542 | 18.3 | 90.79 | 66.89 | 60/60/60 | 10/6/6 |
| 2015-12-07 | 2.321 | 1.542 | 18.4 | 89.03 | 66.27 | 60/60/60 | 10/6/6 |
| 2015-12-08 | 2.300 | 1.552 | 19.5 | 87.15 | 65.60 | 60/60/60 | 10/6/6 |
| 2015-12-10 | 2.278 | 1.564 | 20.7 | 83.95 | 64.42 | 60/60/60 | 10/6/6 |
| 2015-12-12 | 2.257 | 1.579 | 21.8 | 81.19 | 63.37 | 60/60/60 | 10/6/6 |
| 2015-12-16 | 2.216 | 1.612 | 23.7 | 76.31 | 61.49 | 60/60/60 | 10/6/6 |
| 2015-12-19 | 2.185 | 1.642 | 25.0 | 73.51 | 60.40 | -/60/60 | -/6/6 |
| 2015-12-23 | 2.142 | 1.690 | 26.5 | 70.19 | 59.12 | 60/60/60 | 10/6/6 |
| 2015-12-29 | 2.082 | 1.766 | 28.1 | 66.50 | 57.77 | 60/60/60 | 10/6/6 |
| 2015-12-30 | 2.072 | 1.780 | 28.3 | 65.98 | 57.59 | 60/60/60 | 10/6/6 |
| 2015-12-31 | 2.060 | 1.795 | 28.5 | 65.45 | 57.41 | 60/60/60 | 10/6/6 |
| 2016-01-01 | 2.051 | 1.807 | 28.6 | 64.98 | 57.25 | 60/60/60 | 10/6/6 |
| 2016-01-02 | 2.040 | 1.823 | 28.8 | 64.52 | 57.10 | 60/60/60 | 10/6/6 |
| 2016-01-07 | 1.990 | 1.893 | 29.2 | 62.43 | 56.47 | 60/60/60 | 10/6/6 |
| 2016-01-08 | 1.979 | 1.909 | 29.2 | 62.05 | 56.37 | 60/60/60 | 10/6/6 |
Notes. (a)heliocentric distance, (b)geocentric distance, (c)phase angle, (d)position angles of the extended Sun-to-target radius vector, (e)negative of the heliocentric velocity vector of the target, (f)total exposure time in each filter (B/V/R), and (g)number of observation cycles in each filter (B, V, and R).
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