Table 2
Heliocentric and barycentric orbital elements, and 1σ uncertainties of interstellar comet 2I/Borisov (I).
| Orbital parameter | Heliocentric | Barycentric | |
|---|---|---|---|
| Eccentricity, e | = | 3.3571 ± 0.0002 | 3.3641 |
| Perihelion distance, q (AU) | = | 2.00662 ± 0.00002 | 2.01315 |
| Inclination, i (°) | = | 44.05349 ± 0.00014 | 44.06149 |
| Longitude of the ascending node, Ω (°) | = | 308.1500 ± 0.0003 | 308.0993 |
| Argument of perihelion, ω (°) | = | 209.1244 ± 0.0004 | 209.2067 |
| Time of perihelion passage, τ (TDB) | = | 2 458 826.0543 ± 0.0006 | 2 458 826.3146 |
| Nongravitational radial acceleration parameter, A1 (AU d−2) | = | −4.1 × 10−8 ± 3.5 × 10−8 | |
| Nongravitational transverse acceleration parameter, A2 (AU d−2) | = | −2.9 × 10−8 ± 5.9 × 10−8 | |
| Nongravitational normal acceleration parameter, A3 (AU d−2) | = | −1.15 × 10−7 ± 1.7 × 10−8 | |
Notes. This solution is hyperbolic with a statistical significance of 10950-σ (barycentric, using all the decimal figures provided by the data source) and it is based on 1191 observations that span a data-arc of 389 d. Interstellar comet 2I/Borisov reached perihelion on December 8, 2019; the last observation used in these calculations was acquired on January 6, 2020 (the first one corresponds to December 13, 2018). The orbit determination has been computed by D. Farnocchia at epoch JD 2 458 853.5 that corresponds to 00:00:00.000 TDB on 2020 January 5, J2000.0 ecliptic and equinox. Source: JPL’s SSDG SBDB (solution date, 2020-Jan.-09 10:42:19 PST).
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