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 | |
| previous orbit statistics, both Galactic and stellar perturbations were taken into account | ||
|---|---|---|
| no. of returning VCs in the swarm | 2342 | |
| no. of escaping VCs in the swarm | 2659 | |
| no. of hyperbolas among escaping VCs in the swarm | 2639 | * |
| previous reciprocal semi-major axis [10-6 au-1] | -3,179.54 – -135.60 – 2,791.32 | |
| previous perihelion distance [au] | 2.475 – 2.479 – 2.482 | R |
| previous aphelion distance [103 au] | 0.53 – 1.3 – 7.5 | |
| time interval to previous perihelion [Myr] | 0.004 – 0.017 – 0.2 | R |
| percentage of VCs with qprev < 10 | 99 | |
| percentage of VCs with qprev > 20 | 1 | |
| previous orbit statistics, here only the Galactic tide has been included | ||
|---|---|---|
| no. of returning VCs in the swarm | 2343 | |
| no. of escaping VCs in the swarm | 2658 | |
| no. of hyperbolas among escaping VCs in the swarm | 2639 | * |
| previous reciprocal semi-major axis [10-6 au-1] | -3,179.59 – -135.60 – 2,791.32 | |
| previous perihelion distance [au] | 2.4745 – 2.4786 – 2.4807 | R |
| previous aphelion distance [103 au] | 0.53 – 1.3 – 7.5 | |
| time interval to previous perihelion [Myr] | 0.004 – 0.017 – 0.2 | R |
| percentage of VCs with qprev < 10 | 100 | |