C/2020 H6 ATLAS
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Comet C/2020 H6 was discovered on 22 April 2020, about 1.3 yr before its perihelion passage. This comet was observed until 8 January 2024 (as in February 2025).
Comet had its closest approach to the Earth on 30 April 2021 (3.86 au); about six months before its perihelion passage.
The preferred NG solution ('bd') given here is based on data span over 3.72 yr in a range of heliocentric distances: 6.22 au – 4.70 au (perihelion) – 7.80 au. Orbits based on pre-perihelion and post-perihelion data independently are also presented.
This Oort spike comet suffers moderate planetary perturbations during its passage through the planetary system that lead to a significantly more tight future orbit (semimajor axis of about 2,000 au).
Comet had its closest approach to the Earth on 30 April 2021 (3.86 au); about six months before its perihelion passage.
The preferred NG solution ('bd') given here is based on data span over 3.72 yr in a range of heliocentric distances: 6.22 au – 4.70 au (perihelion) – 7.80 au. Orbits based on pre-perihelion and post-perihelion data independently are also presented.
This Oort spike comet suffers moderate planetary perturbations during its passage through the planetary system that lead to a significantly more tight future orbit (semimajor axis of about 2,000 au).
| solution description | ||
|---|---|---|
| number of observations | 2108 | |
| data interval | 2020 04 22 – 2024 01 08 | |
| data type | perihelion within the observation arc (FULL) | |
| data arc selection | entire data set (STD) | |
| range of heliocentric distances | 6.22 au – 4.70 au (perihelion) – 7.8 au | |
| type of model of motion | CT - non-gravitational orbits for assymetric CO-g(r)-like function | |
| data weighting | YES | |
| number of residuals | 4166 | |
| RMS [arcseconds] | 0.38 | |
| orbit quality class | 1a+ | |
| previous orbit statistics, both Galactic and stellar perturbations were taken into account | ||
|---|---|---|
| no. of returning VCs in the swarm | 656 | |
| no. of escaping VCs in the swarm | 4345 | * |
| no. of hyperbolas among escaping VCs in the swarm | 0 | |
| previous reciprocal semi-major axis [10-6 au-1] | 13.89 – 15.98 – 17.89 | |
| previous perihelion distance [au] | 875 – 935 – 1000 | |
| previous aphelion distance [103 au] | 110 – 120 – 140 | |
| synchronous stop epoch [Myr] | -3.49 | S |
| percentage of VCs with qprev > 20 | 100 | |
Upper panel: 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.
Middle panel(s): O-C diagram for a given solution (sometimes in comparison to another solution available in CODE), where residuals in right ascension are shown using magenta dots and in declination by blue open circles.
Lowest panel: Relative weights for a given data set(s).
Middle panel(s): O-C diagram for a given solution (sometimes in comparison to another solution available in CODE), where residuals in right ascension are shown using magenta dots and in declination by blue open circles.
Lowest panel: Relative weights for a given data set(s).
| previous_g orbit statistics, here only the Galactic tide has been included | ||
|---|---|---|
| no. of returning VCs in the swarm | 11 | |
| no. of escaping VCs in the swarm | 4990 | * |
| no. of hyperbolas among escaping VCs in the swarm | 0 | |
| previous reciprocal semi-major axis [10-6 au-1] | 9.02 – 11.55 – 13.89 | |
| previous perihelion distance [au] | 44.2 – 48.9 – 54.3 | |
| previous aphelion distance [103 au] | 140 – 170 – 220 | |
| synchronous stop epoch [Myr] | -3.32 | S |
| percentage of VCs with qprev > 20 | 100 | |