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).
solution description
number of observations 1311
data interval 2021 12 16 – 2024 01 08
data arc selection data generally limited to post-perihelion (POS)
range of heliocentric distances 4.74 au – 7.8au
detectability of NG effects in the comet's motion comet with determinable NG~orbit
type of model of motion GR - gravitational orbit
data weighting YES
number of residuals 2580
RMS [arcseconds] 0.41
orbit quality class 1a
orbital elements (heliocentric ecliptic J2000)
Epoch 2021 09 23
perihelion date 2021 10 01.07243848 ± 0.00034015
perihelion distance [au] 4.70285894 ± 0.00000246
eccentricity 1.00069019 ± 0.00000206
argument of perihelion [°] 20.347472 ± 0.000056
ascending node [°] 213.706315 ± 0.000012
inclination [°] 79.96694 ± 0.000009
reciprocal semi-major axis [10-6 au-1] -146.76 ± 0.44
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).