C/2020 H5 Robinson
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Comet C/2020 H5 was discovered on 22 April 2020 by ATLAS-HKO (Haleakala), that is about 7.5 months before its perihelion passage. was observed until the 11 May 2024. Several prediscovery images of this comet were found going back to the mid-December 2015.
Comet had its closest approach to the Earth on 11 April 2021 (8.48 au), about 4 months after its perihelion passage.
Preferred GR solution given here is based on data span over 8.41 yr in a range of heliocentric distances: 13.59 au – 9.34 au (perihelion) – 11.60 au; also orbit based on pre-perihelion data is presented.
This long-period comet (original semimajor axis of about 7,000–7,500 au) suffers small planetary perturbations during its passage through the planetary system that lead to a more tight future orbit (semimajor axis of about 4,000 au).
Comet had its closest approach to the Earth on 11 April 2021 (8.48 au), about 4 months after its perihelion passage.
Preferred GR solution given here is based on data span over 8.41 yr in a range of heliocentric distances: 13.59 au – 9.34 au (perihelion) – 11.60 au; also orbit based on pre-perihelion data is presented.
This long-period comet (original semimajor axis of about 7,000–7,500 au) suffers small planetary perturbations during its passage through the planetary system that lead to a more tight future orbit (semimajor axis of about 4,000 au).
| solution description | ||
|---|---|---|
| number of observations | 278 | |
| data interval | 2015 12 14 – 2024 05 11 | |
| data type | perihelion within the observation arc (FULL) | |
| data arc selection | entire data set (STD) | |
| range of heliocentric distances | 13.59 au – 9.35 au (perihelion) – 11.6 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 | 551 | |
| RMS [arcseconds] | 0.32 | |
| orbit quality class | 1a+ | |
| orbital elements (heliocentric ecliptic J2000) | ||
|---|---|---|
| Epoch | 2020 12 17 | |
| perihelion date | 2020 12 12.27623319 | ± 0.00071949 |
| perihelion distance [au] | 9.34530362 | ± 0.00000544 |
| eccentricity | 0.99753071 | ± 0.00000498 |
| argument of perihelion [°] | 326.414153 | ± 0.000031 |
| ascending node [°] | 210.641607 | ± 0.000006 |
| inclination [°] | 70.210442 | ± 0.000011 |
| reciprocal semi-major axis [10-6 au-1] | 264.23 | ± 0.53 |
Time distribution of positional observations with corresponding heliocentric (red curve) and geocentric (green curve) distance at which they were taken. The horizontal dotted line shows the perihelion distance for a given comet whereas vertical dotted line — the moment of perihelion passage.