C/2020 R7 ATLAS
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Comet C/2020 R7 was discovered on 15 September 2020, two years before its perihelion passage. Later a series of observations were found from 3 December 2019. This comet was observed until 31 July 2024 (as in February 2025).
Comet had its closest approach to the Earth on 15 Julyl 2022 (2.18 au); about 2 months before its perihelion passage.
Currently, the preferred NG solution given here is based on data span over 4.66 yr in a range of heliocentric distances: 9.08 au – 2.96 au (perihelion) – 6.81 au. This comet shows large trends in the O-C distribution for a purely gravitational orbit. However, still some trends in [O-C] are visible for NG solutions based on full data arc (see solution 'c5' or 'n5'), trends substantially decrease for NG orbit based on pre-perihelion data atc (solution 'pc').
This Oort spike comet suffers moderate planetary perturbations during its passage through the planetary system that lead to a more tight future orbit (semimajor axis of about 1,800 au).
Comet had its closest approach to the Earth on 15 Julyl 2022 (2.18 au); about 2 months before its perihelion passage.
Currently, the preferred NG solution given here is based on data span over 4.66 yr in a range of heliocentric distances: 9.08 au – 2.96 au (perihelion) – 6.81 au. This comet shows large trends in the O-C distribution for a purely gravitational orbit. However, still some trends in [O-C] are visible for NG solutions based on full data arc (see solution 'c5' or 'n5'), trends substantially decrease for NG orbit based on pre-perihelion data atc (solution 'pc').
This Oort spike comet suffers moderate planetary perturbations during its passage through the planetary system that lead to a more tight future orbit (semimajor axis of about 1,800 au).
| solution description | ||
|---|---|---|
| number of observations | 1836 | |
| data interval | 2019 12 03 – 2024 07 31 | |
| data type | perihelion within the observation arc (FULL) | |
| data arc selection | entire data set (STD) | |
| range of heliocentric distances | 9.08 au – 2.96 au (perihelion) – 6.81 au | |
| type of model of motion | NC - non-gravitational orbits for symmetric CO-g(r)-like function | |
| data weighting | YES | |
| number of residuals | 3587 | |
| RMS [arcseconds] | 0.45 | |
| orbit quality class | 1a+ | |
| orbital elements (heliocentric ecliptic J2000) | ||
|---|---|---|
| Epoch | 2022 09 18 | |
| perihelion date | 2022 09 16.23799630 | ± 0.00008384 |
| perihelion distance [au] | 2.95596111 | ± 0.00000093 |
| eccentricity | 1.00008137 | ± 0.00000195 |
| argument of perihelion [°] | 347.837679 | ± 0.000021 |
| ascending node [°] | 268.281969 | ± 0.000006 |
| inclination [°] | 114.89105 | ± 0.000005 |
| reciprocal semi-major axis [10-6 au-1] | -27.53 | ± 0.66 |
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).
| non-gravitational parameters | ||
|---|---|---|
| A1 [10-8au/day2] | 1.1359 | ± 0.0348 |
| A2 [10-8au/day2] | -0.65123 | ± 0.03604 |
| A3 [10-8au/day2] | -0.11373 | ± 0.00641 |
| m | -2.00 | |
| n | 3.000 | |
| k | -2.6000 | |
| r0 [au] | 10.000 | |
| α | 0.0100 | |