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Table 1
Characteristics of nominal orbit of comet 2P/Encke (Giorgini et al. 1996).
| Parameter | Value |
|---|---|
| Epoch | 2014 November 14.0 |
| (JDT = 2456975.5) | |
| Perihelion | |
| distance | q = (0.33604472 ± 0.00000017) au |
| Eccentricity | e = 0.848294191 ± 0.000000075 |
| Semi-major axis | a = 2.215107758 ± 0.000000063 au |
| Argument of | |
| perihelion | ω = 186.541808° ± 0.000039° |
| Longitude of | |
| ascending node | Ω = 334.568755° ± 0.000039° |
| Inclination: | i = 11.7809254° ± 0.0000056° |
| Time of perihel. | |
| Passage | T = 2456618.221611 ± 0.000011 |
| (2013 November 21.72161) | |
| Orbital period | P = 1204.17807054 ± 0.00000014 day |
| (3.30 yr) | |
| Non-gravitational parameters in direction | |
| Radial | A1 = (−1.344 ± 1.633) × 10−11 au day−2 |
| Transverse | A2 = (−2.283 ± 0.995) × 10−12 au day−2 |
| Perpendicular | A3 = 1.799 × 10−9 au day−2 (the |
| determination error is unknown) | |
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