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+ | |
| previous orbit statistics, both Galactic and stellar perturbations were taken into account | ||
|---|---|---|
| no. of returning VCs in the swarm | 4791 | * |
| no. of escaping VCs in the swarm | 210 | |
| no. of hyperbolas among escaping VCs in the swarm | 0 | |
| previous reciprocal semi-major axis [10-6 au-1] | 19.73 – 26.91 – 34.49 | R |
| previous perihelion distance [au] | 1100 – 2100 – 3900 | R |
| previous aphelion distance [103 au] | 57 – 72 – 97 | R |
| time interval to previous perihelion [Myr] | 4.4 – 6.6 – 10 | R |
| 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 | 4571 | * |
| no. of escaping VCs in the swarm | 430 | |
| no. of hyperbolas among escaping VCs in the swarm | 2 | |
| previous reciprocal semi-major axis [10-6 au-1] | 19.20 – 26.90 – 36.31 | R |
| previous perihelion distance [au] | 11 – 60 – 480 | R |
| previous aphelion distance [103 au] | 55 – 74 – 100 | R |
| time interval to previous perihelion [Myr] | 4.5 – 7 – 11 | R |
| percentage of VCs with qprev < 10 | 9 | |
| percentage of VCs with 10 < qprev < 20 | 14 | |
| percentage of VCs with qprev > 20 | 77 | |