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 | 2028 | |
| data interval | 2018 11 27 – 2020 06 15 | |
| data type | perihelion within the observation arc (FULL) | |
| data arc selection | entire data set (STD) | |
| range of heliocentric distances | 3.81 au – 1.46 au (perihelion) – 3.83 au | |
| type of model of motion | NS - non-gravitational orbits for standard g(r) | |
| data weighting | YES | |
| number of residuals | 4020 | |
| RMS [arcseconds] | 0.41 | |
| orbit quality class | 1a | |
| orbital elements (heliocentric ecliptic J2000) | ||
|---|---|---|
| Epoch | 2019 08 25 | |
| perihelion date | 2019 09 05.72837615 | ± 0.00001579 |
| perihelion distance [au] | 1.45466033 | ± 0.00000027 |
| eccentricity | 1.00074883 | ± 0.00000177 |
| argument of perihelion [°] | 157.972740 | ± 0.000015 |
| ascending node [°] | 181.849258 | ± 0.000002 |
| inclination [°] | 116.615389 | ± 0.000013 |
| reciprocal semi-major axis [10-6 au-1] | -514.78 | ± 1.22 |
| non-gravitational parameters | ||
|---|---|---|
| A1 [10-8au/day2] | 0.57711 | ± 0.0388 |
| A2 [10-8au/day2] | -0.072359 | ± 0.038397 |
| A3 [10-8au/day2] | 0.31833 | ± 0.01946 |
| m | -2.15 | |
| n | 5.093 | |
| k | -4.6142 | |
| r0 [au] | 2.808 | |
| α | 0.1113 | |