C/2021 G2 ATLAS = A/2021 G2
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Comet C/2021 G2 was discovered on 11 April 2021 by ATLAS-MLO (Mauna Loa), that is three years and five months before its perihelion passage.
Comet had its closest approach to the Earth on 15 April 2024 (4.24 au), about five months before its perihelion passage, about 8 months after perihelion (on 1 May 2025) it will approaches the Earth within 4.31 au. So, as in March 2025 the comet is still observed.
The preferred NG solution given here is based on pre-perihelion data span over 3.80 yr in a range of heliocentric distances from 10.98 au to 4.98 au.
This Oort spike comet suffers small planetary perturbations during its passage through the planetary system that likely lead to escape the comet from the planetary zone on a hyperbolic orbit.
Comet had its closest approach to the Earth on 15 April 2024 (4.24 au), about five months before its perihelion passage, about 8 months after perihelion (on 1 May 2025) it will approaches the Earth within 4.31 au. So, as in March 2025 the comet is still observed.
The preferred NG solution given here is based on pre-perihelion data span over 3.80 yr in a range of heliocentric distances from 10.98 au to 4.98 au.
This Oort spike comet suffers small planetary perturbations during its passage through the planetary system that likely lead to escape the comet from the planetary zone on a hyperbolic orbit.
| solution description | ||
|---|---|---|
| number of observations | 1545 | |
| data interval | 2020 11 03 – 2024 08 21 | |
| data arc selection | data generally limited to pre-perihelion (PRE) | |
| range of heliocentric distances | 10.98 au – 4.98au | |
| type of model of motion | NC - non-gravitational orbits for symmetric CO-g(r)-like function | |
| data weighting | YES | |
| number of residuals | 3069 | |
| RMS [arcseconds] | 0.25 | |
| orbit quality class | 1a+ | |
| previous orbit statistics, both Galactic and stellar perturbations were taken into account | ||
|---|---|---|
| no. of returning VCs in the swarm | 5001 | * |
| no. of escaping VCs in the swarm | 0 | |
| no. of hyperbolas among escaping VCs in the swarm | 0 | |
| previous reciprocal semi-major axis [10-6 au-1] | 23.69 – 24.21 – 24.75 | |
| previous perihelion distance [au] | 1780 – 1840 – 1900 | |
| previous aphelion distance [103 au] | 79 – 80.8 – 82.5 | |
| time interval to previous perihelion [Myr] | 7.5 – 7.77 – 8.04 | |
| percentage of VCs with qprev > 20 | 100 | |
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.
| previous_g orbit statistics, here only the Galactic tide has been included | ||
|---|---|---|
| no. of returning VCs in the swarm | 5001 | * |
| no. of escaping VCs in the swarm | 0 | |
| no. of hyperbolas among escaping VCs in the swarm | 0 | |
| previous reciprocal semi-major axis [10-6 au-1] | 22.30 – 22.95 – 23.65 | |
| previous perihelion distance [au] | 130 – 160 – 190 | |
| previous aphelion distance [103 au] | 84.5 – 87 – 89.5 | |
| time interval to previous perihelion [Myr] | 8.38 – 8.74 – 9.1 | |
| percentage of VCs with qprev > 20 | 100 | |