C/2018 W2 Africano
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Comet C/2018 W2 was discovered on 27 November 2018, about ten months before its perihelion passage, and was last seen on 15 June 2020.
Solutions (GR and NG) given here span over 1.55 yr in a range of heliocentric distances: 3.81 au – 1.46 au (perihelion) – 3.83 au; also orbit based on pre-perihelion data is presented.
This long-period comet of original semimajor axis of about 2,000 au suffers moderate planetary perturbations during its passage through the planetary system and these perturbations lead to escape the comet from the planetary zone on a hyperbolic orbit (see future barycentric orbits).
Solutions (GR and NG) given here span over 1.55 yr in a range of heliocentric distances: 3.81 au – 1.46 au (perihelion) – 3.83 au; also orbit based on pre-perihelion data is presented.
This long-period comet of original semimajor axis of about 2,000 au suffers moderate planetary perturbations during its passage through the planetary system and these perturbations lead to escape the comet from the planetary zone on a hyperbolic orbit (see future barycentric orbits).
| solution description | ||
|---|---|---|
| number of observations | 1000 | |
| data interval | 2018 11 27 – 2019 09 05 | |
| data arc selection | data generally limited to pre-perihelion (PRE) | |
| range of heliocentric distances | 3.81 au – 1.46 au (perihelion) – 1.45 au | |
| detectability of NG effects in the comet's motion | comet with determinable NG~orbit | |
| type of model of motion | GR - gravitational orbit | |
| data weighting | YES | |
| number of residuals | 1979 | |
| RMS [arcseconds] | 0.37 | |
| orbit quality class | 1a | |
| previous orbit statistics, both Galactic and stellar perturbations were taken into account | ||
|---|---|---|
| no. of returning VCs in the swarm | 5001 | * |
| no. of escaping VCs in the swarm | 0 | |
| no. of hyperbolas among escaping VCs in the swarm | 0 | |
| previous reciprocal semi-major axis [10-6 au-1] | 492.58 – 493.36 – 494.11 | |
| previous perihelion distance [au] | 1.45784 – 1.45785 – 1.45785 | |
| previous aphelion distance [103 au] | 4.046 – 4.052 – 4.059 | |
| time interval to previous perihelion [Myr] | 0.09069 – 0.09089 – 0.09111 | |
| percentage of VCs with qprev < 10 | 100 | |
| previous orbit statistics, here only the Galactic tide has been included | ||
|---|---|---|
| no. of returning VCs in the swarm | 5001 | * |
| no. of escaping VCs in the swarm | 0 | |
| no. of hyperbolas among escaping VCs in the swarm | 0 | |
| previous reciprocal semi-major axis [10-6 au-1] | 492.58 – 493.36 – 494.11 | |
| previous perihelion distance [au] | 1.45766 – 1.45766 – 1.45767 | |
| previous aphelion distance [103 au] | 4.046 – 4.052 – 4.059 | |
| time interval to previous perihelion [Myr] | 0.09069 – 0.09089 – 0.09111 | |
| percentage of VCs with qprev < 10 | 100 | |