C/2019 Q1 Lemmon
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Comet C/2019 Q1 was discovered on 28 August 2019, almost one year before its perihelion passage. Later two series of pre-discovery observations were found from 2 January 2019 and 10 November 2018. This comet was observed until 4 June 2021.
Comet had its closest approach to the Earth on 3 September 2020 (4.09 au); 1.5 month after its perihelion passage.
Solutions (GR and NG) given here are based on data span over 2.56 yr in a range of heliocentric distances: 6.80 au – 5.00 au (perihelion) – 5.56 au. Orbits based on pre-perihelion and post-perihelion data independently were also obtained.
This Oort spike comet suffers small planetary perturbations during its passage through the planetary system; however, they lead to escape this comet from the solar system on hyperbolic orbit (see future barycentric orbits).
Comet had its closest approach to the Earth on 3 September 2020 (4.09 au); 1.5 month after its perihelion passage.
Solutions (GR and NG) given here are based on data span over 2.56 yr in a range of heliocentric distances: 6.80 au – 5.00 au (perihelion) – 5.56 au. Orbits based on pre-perihelion and post-perihelion data independently were also obtained.
This Oort spike comet suffers small planetary perturbations during its passage through the planetary system; however, they lead to escape this comet from the solar system on hyperbolic orbit (see future barycentric orbits).
| solution description | ||
|---|---|---|
| number of observations | 160 | |
| data interval | 2018 11 10 – 2020 07 16 | |
| data arc selection | data generally limited to pre-perihelion (PRE) | |
| range of heliocentric distances | 6.8 au – 5au | |
| type of model of motion | NC - non-gravitational orbits for symmetric CO-g(r)-like function | |
| data weighting | YES | |
| number of residuals | 314 | |
| RMS [arcseconds] | 0.34 | |
| orbit quality class | 1b | |
| orbital elements (heliocentric ecliptic J2000) | ||
|---|---|---|
| Epoch | 2020 07 10 | |
| perihelion date | 2020 07 19.63636272 | ± 0.03006836 |
| perihelion distance [au] | 4.99725225 | ± 0.00007117 |
| eccentricity | 1.00086833 | ± 0.00002774 |
| argument of perihelion [°] | 55.914381 | ± 0.004142 |
| ascending node [°] | 42.337277 | ± 0.000293 |
| inclination [°] | 155.721183 | ± 0.000168 |
| reciprocal semi-major axis [10-6 au-1] | -173.76 | ± 5.55 |
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] | 8.4309 | ± 3.0501 |
| A2 [10-8au/day2] | 3.3157 | ± 1.6475 |
| A3 [10-8au/day2] | -0.31222 | ± 0.42139 |
| m | -2.00 | |
| n | 3.000 | |
| k | -2.6000 | |
| r0 [au] | 10.000 | |
| α | 0.0100 | |