C/2018 C2 Lemmon
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Comet C/2018 C2 was discovered on 5 February 2018, about four months before its perihelion passage; later a few prediscovery measurements going back to 28 January 2018 were found. This comet was last seen on 27 October 2018.
Solutions (GR and NG) given here are based on data span over 0.748 yr in the range of heliocentric distances: 2.47 au – 1.96 au (perihelion) – 2.63 au.
This Oort spike comet suffers moderate planetary perturbations during its passage through the planetary system that lead to a more tight future orbit (see future barycentric orbit).
Solutions (GR and NG) given here are based on data span over 0.748 yr in the range of heliocentric distances: 2.47 au – 1.96 au (perihelion) – 2.63 au.
This Oort spike comet suffers moderate planetary perturbations during its passage through the planetary system that lead to a more tight future orbit (see future barycentric orbit).
| solution description | ||
|---|---|---|
| number of observations | 1677 | |
| data interval | 2018 01 28 – 2018 10 27 | |
| data type | perihelion within the observation arc (FULL) | |
| data arc selection | entire data set (STD) | |
| range of heliocentric distances | 2.47 au – 1.96 au (perihelion) – 2.63 au | |
| type of model of motion | NS - non-gravitational orbits for standard g(r) | |
| data weighting | YES | |
| number of residuals | 3273 | |
| RMS [arcseconds] | 0.17 | |
| orbit quality class | 1a | |
| orbital elements (heliocentric ecliptic J2000) | ||
|---|---|---|
| Epoch | 2018 06 11 | |
| perihelion date | 2018 06 02.22213833 | ± 0.00006070 |
| perihelion distance [au] | 1.95651499 | ± 0.00000051 |
| eccentricity | 1.00183780 | ± 0.00000115 |
| argument of perihelion [°] | 134.138092 | ± 0.000030 |
| ascending node [°] | 91.139069 | ± 0.000014 |
| inclination [°] | 34.453761 | ± 0.000011 |
| reciprocal semi-major axis [10-6 au-1] | -939.32 | ± 0.59 |
| non-gravitational parameters | ||
|---|---|---|
| A1 [10-8au/day2] | 0.38291 | ± 0.12699 |
| A2 [10-8au/day2] | 0.3448 | ± 0.06033 |
| A3 [10-8au/day2] | 0.28318 | ± 0.05432 |
| m | -2.15 | |
| n | 5.093 | |
| k | -4.6142 | |
| r0 [au] | 2.808 | |
| α | 0.1113 | |