C/2021 D2 ZTF
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Comet C/2021 D2 was discovered on 19 February 2021 by Palomar Mountain--ZTF, that is almost a year before its perihelion passage.
Comet had its closest approach to the Earth on 7 February 2022 (2.54 au), about four days after its perihelion passage.
The preferred NG solution given here is based on data span over 2.17 yr in a range of heliocentric distances: 4.46 au – 2.95 au (perihelion) – 5.10 au.
This Oort spike comet suffers small planetary perturbations during its passage through the planetary system that lead to escape the comet from the planetary zone on a hyperbolic orbit (see future barycentric orbits).
Comet had its closest approach to the Earth on 7 February 2022 (2.54 au), about four days after its perihelion passage.
The preferred NG solution given here is based on data span over 2.17 yr in a range of heliocentric distances: 4.46 au – 2.95 au (perihelion) – 5.10 au.
This Oort spike comet suffers small planetary perturbations during its passage through the planetary system that lead to escape the comet from the planetary zone on a hyperbolic orbit (see future barycentric orbits).
| solution description | ||
|---|---|---|
| number of observations | 561 | |
| data interval | 2021 02 19 – 2022 01 29 | |
| data arc selection | data generally limited to pre-perihelion (PRE) | |
| range of heliocentric distances | 4.46 au – 2.95au | |
| type of model of motion | NC - non-gravitational orbits for symmetric CO-g(r)-like function | |
| data weighting | YES | |
| number of residuals | 1107 | |
| RMS [arcseconds] | 0.49 | |
| orbit quality class | 1a+ | |
| orbital elements (heliocentric ecliptic J2000) | ||
|---|---|---|
| Epoch | 2022 01 21 | |
| perihelion date | 2022 02 03.97302149 | ± 0.00396231 |
| perihelion distance [au] | 2.94632163 | ± 0.00001593 |
| eccentricity | 1.00144464 | ± 0.00000814 |
| argument of perihelion [°] | 125.027520 | ± 0.001222 |
| ascending node [°] | 305.678697 | ± 0.000085 |
| inclination [°] | 83.830673 | ± 0.000021 |
| reciprocal semi-major axis [10-6 au-1] | -490.32 | ± 2.76 |
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] | 1.2557 | ± 0.8234 |
| A2 [10-8au/day2] | 0.92808 | ± 0.29278 |
| A3 [10-8au/day2] | 0.24411 | ± 0.11586 |
| m | -2.00 | |
| n | 3.000 | |
| k | -2.6000 | |
| r0 [au] | 10.000 | |
| α | 0.0100 | |