C/2018 U1 Lemmon
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Comet C/2018 U1 was discovered on 27 October 2019, almost four years before its perihelion passage and is still observed (September 2023, 6.64 au from the Sun).
Currently, the solutions (GR and NG) given here are based on pre-perihelion data and span over 3.94 yr in a range of heliocentric distances: 9.33 au – 5.00 au (perihelion).
Currently, the solutions (GR and NG) given here are based on pre-perihelion data and span over 3.94 yr in a range of heliocentric distances: 9.33 au – 5.00 au (perihelion).
| solution description | ||
|---|---|---|
| number of observations | 2289 | |
| data interval | 2019 02 08 – 2021 06 18 | |
| data arc selection | data generally limited to pre-perihelion (PRE) | |
| range of heliocentric distances | 9.33 au – 5au | |
| type of model of motion | NC - non-gravitational orbits for symmetric CO-g(r)-like function | |
| data weighting | YES | |
| number of residuals | 4524 | |
| RMS [arcseconds] | 0.35 | |
| orbit quality class | 1a+ | |
| orbital elements (heliocentric ecliptic J2000) | ||
|---|---|---|
| Epoch | 2018 10 09 | |
| perihelion date | 2021 11 02.49137752 | ± 0.00128966 |
| perihelion distance [au] | 4.99950439 | ± 0.00000501 |
| eccentricity | 1.00049372 | ± 0.00000471 |
| argument of perihelion [°] | 180.332642 | ± 0.000094 |
| ascending node [°] | 75.476371 | ± 0.000018 |
| inclination [°] | 108.301298 | ± 0.000008 |
| reciprocal semi-major axis [10-6 au-1] | -98.75 | ± 0.94 |
| non-gravitational parameters | ||
|---|---|---|
| A1 [10-8au/day2] | 0.40391 | ± 0.17926 |
| A2 [10-8au/day2] | 1.1101 | ± 0.1528 |
| A3 [10-8au/day2] | -0.56664 | ± 0.03909 |
| m | -2.00 | |
| n | 3.000 | |
| k | -2.6000 | |
| r0 [au] | 10.000 | |
| α | 0.0100 | |