Table 1
Observing geometry.
| UT date and time | DOY(a) | ∆Tp(b) | v(c) | rH(d) | ∆(e) | α(f) | θ⊙(g) | θ−v(h) | δ⊕(i) |
|---|---|---|---|---|---|---|---|---|---|
| 2018 Sep. 28 18:19–18:56 | 271 | v11 | 354.6 | 1.758 | 0.786 | 11.9 | 11.9 | 243.2 | 9.1 |
| 2018 Nov. 14 20:07–20:46 | 318 | 36 | 18.1 | 1.782 | 1.035 | 27.5 | 60.2 | 242.6 | 1.0 |
| 2018 Dec. 28 20:54–21:32 | 362 | 80 | 38.6 | 1.877 | 1.503 | 31.4 | 66.8 | 239.7 | −3.5 |
Notes. (a)Day of year, UT 2018 January 1 = 1. (b) Number of days from perihelion (UT 2018 October 9 = DOY 282). (c) True anomaly, in degrees. (d)Heliocentric distance, in AU. (e)Geocentric distance, in AU. (f)Phase angle, in degrees. (g)Position angle of projected anti-Solar direction, in degrees. (h)Position angle of projected negative heliocentric velocity vector, in degrees.(i) Angle from orbital plane, in degrees.
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