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+ | |
| orbital elements (heliocentric ecliptic J2000) | ||
|---|---|---|
| Epoch | 2024 09 07 | |
| perihelion date | 2024 09 09.20816727 | ± 0.00128477 |
| perihelion distance [au] | 4.98238515 | ± 0.00000360 |
| eccentricity | 1.00017920 | ± 0.00000276 |
| argument of perihelion [°] | 343.277712 | ± 0.000169 |
| ascending node [°] | 221.095171 | ± 0.000015 |
| inclination [°] | 48.473011 | ± 0.000018 |
| reciprocal semi-major axis [10-6 au-1] | -35.97 | ± 0.55 |
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.
| non-gravitational parameters | ||
|---|---|---|
| A1 [10-8au/day2] | 2.2581 | ± 0.1314 |
| A2 [10-8au/day2] | -1.8205 | ± 0.0928 |
| A3 [10-8au/day2] | -0.36235 | ± 0.03854 |
| m | -2.00 | |
| n | 3.000 | |
| k | -2.6000 | |
| r0 [au] | 10.000 | |
| α | 0.0100 | |