C/2018 F3 Johnson
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Comet C/2018 C2 was discovered on 20 March 2018, about seven months after its perihelion passage and was was last seen on less than a three weeks later on 6 April.
Therefore, the solution given here is based on post-perihelion data, spans over 0.047 yr in a very narrow range of heliocentric distances from 3.38 au to 3.51 au, and orbital parameters are uncertain (orbit of 3b quality class).
Therefore, the solution given here is based on post-perihelion data, spans over 0.047 yr in a very narrow range of heliocentric distances from 3.38 au to 3.51 au, and orbital parameters are uncertain (orbit of 3b quality class).
| solution description | ||
|---|---|---|
| number of observations | 51 | |
| data interval | 2018 03 20 – 2018 04 06 | |
| data type | observed only after perihelion (POST) | |
| data arc selection | entire data set (STD) | |
| range of heliocentric distances | 3.38 au – 3.51au | |
| detectability of NG effects in the comet's motion | NG effects not determinable | |
| type of model of motion | GR - gravitational orbit | |
| data weighting | NO | |
| number of residuals | 88 | |
| RMS [arcseconds] | 0.42 | |
| orbit quality class | 3b | |
| orbital elements (heliocentric ecliptic J2000) | ||
|---|---|---|
| Epoch | 2017 08 15 | |
| perihelion date | 2017 08 15.31315666 | ± 0.56272092 |
| perihelion distance [au] | 2.48500449 | ± 0.00370103 |
| eccentricity | 1.00051105 | ± 0.00575009 |
| argument of perihelion [°] | 293.067125 | ± 0.168589 |
| ascending node [°] | 173.025403 | ± 0.009227 |
| inclination [°] | 105.560332 | ± 0.082626 |
| reciprocal semi-major axis [10-6 au-1] | -205.65 | ± 2,313.55 |