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 | 2748 | |
| data interval | 2017 10 08 – 2024 04 04 | |
| data type | perihelion within the observation arc (FULL) | |
| data arc selection | entire data set (STD) | |
| range of heliocentric distances | 8.64 au – 4.48 au (perihelion) – 10.95 au | |
| type of model of motion | NC - non-gravitational orbits for symmetric CO-g(r)-like function | |
| data weighting | YES | |
| number of residuals | 5432 | |
| RMS [arcseconds] | 0.41 | |
| orbit quality class | 1a | |
| orbital elements (barycentric ecliptic J2000) | ||
|---|---|---|
| Epoch | 1715 12 17 | |
| perihelion date | 2020 06 16.77644372 | ± 0.00075571 |
| perihelion distance [au] | 4.46291885 | ± 0.00000581 |
| eccentricity | 0.99988737 | ± 0.00000482 |
| argument of perihelion [°] | 27.452363 | ± 0.000117 |
| ascending node [°] | 307.929036 | ± 0.000005 |
| inclination [°] | 103.522948 | ± 0.000018 |
| reciprocal semi-major axis [10-6 au-1] | 25.24 | ± 1.08 |
| file containing 5001 VCs swarm |
|---|
| 2019k7bd.bmi |
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).
Six 2D-projections of the 6D space of original swarm including 5001 VCs. Each density map is given in logarithmic scale presented on the right in the individual panel.