C/2019 K7 Smith
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Comet C/2019 K7 was discovered on 30 May 2019, more than one year before its perihelion passage. Later a few pre-discovery observations were found from 8 and 9 October 2017. This comet was observed until 4 April 2024 (as in February 2025).
Comet had its closest approach to the Earth on 16 July 2020 (3.65 au), a month after its perihelion passage.
The preferred NG solution given here span over 6.49 yr in a range of heliocentric distances: 8.64 au – 4.48 au (perihelion) – 10.95 au; orbits based on pre-perihelion and post-perihelion data independently are also presented.
This Oort spike comet suffers moderate planetary perturbations during its passage through the planetary system that lead to a more tight future orbit with semimajor axis of about 2,500 au (see future barycentric orbit).
Comet had its closest approach to the Earth on 16 July 2020 (3.65 au), a month after its perihelion passage.
The preferred NG solution given here span over 6.49 yr in a range of heliocentric distances: 8.64 au – 4.48 au (perihelion) – 10.95 au; orbits based on pre-perihelion and post-perihelion data independently are also presented.
This Oort spike comet suffers moderate planetary perturbations during its passage through the planetary system that lead to a more tight future orbit with semimajor axis of about 2,500 au (see future barycentric orbit).
| solution description | ||
|---|---|---|
| number of observations | 2123 | |
| data interval | 2020 06 18 – 2024 04 04 | |
| data arc selection | data generally limited to post-perihelion (POS) | |
| range of heliocentric distances | 4.48 au – 10.95au | |
| type of model of motion | NC - non-gravitational orbits for symmetric CO-g(r)-like function | |
| data weighting | YES | |
| number of residuals | 4194 | |
| RMS [arcseconds] | 0.40 | |
| orbit quality class | 1a | |
| next 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 | |
| next reciprocal semi-major axis [10-6 au-1] | 382.88 – 384.01 – 385.19 | |
| next perihelion distance [au] | 4.46925 – 4.46926 – 4.46927 | |
| next aphelion distance [103 au] | 5.188 – 5.204 – 5.219 | |
| time interval to next perihelion [Myr] | 0.1319 – 0.1325 – 0.1331 | |
| percentage of VCs with qnext < 10 | 100 | |
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).
| next_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 | |
| next reciprocal semi-major axis [10-6 au-1] | 382.87 – 384.00 – 385.18 | |
| next perihelion distance [au] | 4.46908 – 4.46909 – 4.4691 | |
| next aphelion distance [103 au] | 5.188 – 5.204 – 5.219 | |
| time interval to next perihelion [Myr] | 0.1319 – 0.1325 – 0.1331 | |
| percentage of VCs with qnext < 10 | 100 | |