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 | 2745 | |
| data interval | 2017 10 08 – 2023 06 03 | |
| data arc selection | some part of the available data set (ST2) | |
| range of heliocentric distances | 8.64 au – 4.48 au (perihelion) – 9.2 au | |
| type of model of motion | NC - non-gravitational orbits for symmetric CO-g(r)-like function | |
| data weighting | YES | |
| number of residuals | 5402 | |
| RMS [arcseconds] | 0.41 | |
| orbit quality class | 1a+ | |
| orbital elements (heliocentric ecliptic J2000) | ||
|---|---|---|
| Epoch | 2017 09 04 | |
| perihelion date | 2020 06 16.71984288 | ± 0.00073911 |
| perihelion distance [au] | 4.47709364 | ± 0.00000484 |
| eccentricity | 1.00143938 | ± 0.00000471 |
| argument of perihelion [°] | 27.233681 | ± 0.000106 |
| ascending node [°] | 307.892702 | ± 0.000004 |
| inclination [°] | 103.507088 | ± 0.000017 |
| reciprocal semi-major axis [10-6 au-1] | -321.50 | ± 1.05 |
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).
| non-gravitational parameters | ||
|---|---|---|
| A1 [10-8au/day2] | 0.027503 | ± 0.037046 |
| A2 [10-8au/day2] | -0.2729 | ± 0.06241 |
| A3 [10-8au/day2] | -0.23804 | ± 0.01278 |
| m | -2.00 | |
| n | 3.000 | |
| k | -2.6000 | |
| r0 [au] | 10.000 | |
| α | 0.0100 | |