C/2020 U4 PanSTARRS
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Comet C/2020 U4 was discovered on 22 October 2020, about 1.5 yr before its perihelion passage; later a series of prediscovery images was found going back to 9 November 2019. In the moment of orbit determination, this comet was still observed.
Solution given here is based on data span over 3.25 yr in a range of heliocentric distances: 8.24 au – 5.35 au (perihelion) – 5.81 au.Orbits based on pre-perihelion and post-perihelion data independently were also obtained.
This Oort spike comet suffers rather small planetary perturbations during its passage through the planetary system; however, they lead to escape the comet from the solar system on hyperbolic barycentric orbit.
Solution given here is based on data span over 3.25 yr in a range of heliocentric distances: 8.24 au – 5.35 au (perihelion) – 5.81 au.Orbits based on pre-perihelion and post-perihelion data independently were also obtained.
This Oort spike comet suffers rather small planetary perturbations during its passage through the planetary system; however, they lead to escape the comet from the solar system on hyperbolic barycentric orbit.
| solution description | ||
|---|---|---|
| number of observations | 957 | |
| data interval | 2019 11 09 – 2023 02 08 | |
| data type | perihelion within the observation arc (FULL) | |
| data arc selection | entire data set (STD) | |
| range of heliocentric distances | 8.24 au – 5.35 au (perihelion) – 5.81 au | |
| detectability of NG effects in the comet's motion | NG effects not determinable | |
| type of model of motion | GR - gravitational orbit | |
| data weighting | YES | |
| number of residuals | 1881 | |
| RMS [arcseconds] | 0.35 | |
| 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] | 19.49 – 19.99 – 20.49 | |
| previous perihelion distance [au] | 615 – 669 – 726 | |
| previous aphelion distance [103 au] | 96.9 – 99.4 – 102 | |
| time interval to previous perihelion [Myr] | 10.4 – 10.8 – 11.2 | |
| percentage of VCs with qprev > 20 | 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] | 21.77 – 22.25 – 22.72 | |
| previous perihelion distance [au] | 190 – 210 – 240 | |
| previous aphelion distance [103 au] | 87.8 – 89.7 – 91.6 | |
| time interval to previous perihelion [Myr] | 9.11 – 9.39 – 9.69 | |
| percentage of VCs with qprev > 20 | 100 | |