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 | 427 | |
| data interval | 2019 11 09 – 2022 03 24 | |
| data arc selection | data generally limited to post-perihelion (POS) | |
| range of heliocentric distances | 5.41 au – 5.81au | |
| 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 | 846 | |
| RMS [arcseconds] | 0.40 | |
| orbit quality class | 1b | |
| orbital elements (heliocentric ecliptic J2000) | ||
|---|---|---|
| Epoch | 2022 04 11 | |
| perihelion date | 2022 04 07.99924580 | ± 0.00657700 |
| perihelion distance [au] | 5.35372889 | ± 0.00002177 |
| eccentricity | 1.00144856 | ± 0.00003446 |
| argument of perihelion [°] | 69.535318 | ± 0.000789 |
| ascending node [°] | 120.013778 | ± 0.000281 |
| inclination [°] | 167.03586 | ± 0.000007 |
| reciprocal semi-major axis [10-6 au-1] | -270.57 | ± 6.43 |