C/2020 S4 PanSTARRS
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Comet C/2020 S4 was discovered on 16 September 2020, about 2.5 yr before its perihelion passage. In the moment of orbit determination, this comet was still observed.
Currently, solutions (GR and NG) based on pre-perihelion data are given. Therefore, the data arc span over 2.40 yr in a range of heliocentric distances from 8.04 au to 3.37 au.
This is Oort spike comet. According to orbits obtained using pre-perihelion data this comet suffers moderate planetary perturbations that lead to escape this comet from the solar system on hyperbolic orbit.
Currently, solutions (GR and NG) based on pre-perihelion data are given. Therefore, the data arc span over 2.40 yr in a range of heliocentric distances from 8.04 au to 3.37 au.
This is Oort spike comet. According to orbits obtained using pre-perihelion data this comet suffers moderate planetary perturbations that lead to escape this comet from the solar system on hyperbolic orbit.
| solution description | ||
|---|---|---|
| number of observations | 992 | |
| data interval | 2020 09 16 – 2023 02 09 | |
| data arc selection | data generally limited to pre-perihelion (PRE) | |
| range of heliocentric distances | 8.04 au – 3.37 au (perihelion) – 3.37 au | |
| type of model of motion | NH - non-gravitational orbits for water sublimation from subsolar point | |
| data weighting | YES | |
| number of residuals | 1975 | |
| RMS [arcseconds] | 0.42 | |
| orbit quality class | 1a | |
| orbital elements (heliocentric ecliptic J2000) | ||
|---|---|---|
| Epoch | 2023 02 25 | |
| perihelion date | 2023 02 09.20308678 | ± 0.00302766 |
| perihelion distance [au] | 3.36981451 | ± 0.00000976 |
| eccentricity | 1.00119645 | ± 0.00001393 |
| argument of perihelion [°] | 20.982870 | ± 0.000685 |
| ascending node [°] | 117.722008 | ± 0.000027 |
| inclination [°] | 20.570469 | ± 0.000039 |
| reciprocal semi-major axis [10-6 au-1] | -355.05 | ± 4.13 |
| non-gravitational parameters | ||
|---|---|---|
| A1 [10-8au/day2] | 9.8549 | ± 0.5191 |
| A2 [10-8au/day2] | 0.97468 | ± 0.63028 |
| A3 [10-8au/day2] | 1.9566 | ± 0.1095 |
| m | -2.05 | |
| n | 3.070 | |
| k | -2,752.4000 | |
| r0 [au] | 50.000 | |
| α | 0.0003 | |