Table 1
Heliocentric and barycentric orbital elements, and 1σ uncertainties of interstellar object 1I/2017 U1 (‘Oumuamua).
| Orbital parameter | Heliocentric | Barycentric | |
|---|---|---|---|
| Eccentricity, e | = | 1.20113 ± 0.00002 | 1.20315 |
| Perihelion distance, q (AU) | = | 0.255912 ± 0.000007 | 0.258847 |
| Inclination, i (°) | = | 122.7417 ± 0.0003 | 123.0322 |
| Longitude of the ascending node, Ω (°) | = | 24.5969 ± 0.0003 | 24.7778 |
| Argument of perihelion, ω (°) | = | 241.8105 ± 0.0012 | 242.0634 |
| Time of perihelion passage, τ (TDB) | = | 2 458 006.0073 ± 0.0003 | 2 458 005.7829 |
| Nongravitational radial acceleration parameter, A1 (AU d−2) | = | 2.8 × 10−7 ± 3.6 × 10−8 | |
| Nongravitational transverse acceleration parameter, A2 (AU d−2) | = | 1.4 × 10−8 ± 2.4 × 10−8 | |
| Nongravitational normal acceleration parameter, A3 (AU d−2) | = | 1.6 × 10−8 ± 2.2 × 10−8 | |
Notes. This solution is hyperbolic with a statistical significance of 9644-σ (barycentric, using all the decimal figures provided by the data source) and it is based on 207 observations that span a data-arc of 80 d. Although ‘Oumuamua reached perihelion on September 9, 2017, the first observation used in the calculations was acquired on October 14, 2017. The orbit determination has been computed by D. Farnocchia at epoch JD 2 458 080.5 that corresponds to 00:00:00.000TDB, Barycentric Dynamical Time, on 2017 November 23, J2000.0 ecliptic and equinox. Source: JPL’s SSDG SBDB (solution date, 2018-Jun.-26 12:17:57 PDT).
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