C/2018 B1 Lemmon
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Comet C/2018 B1 was discovered on 25 January 2018, about two months before its perihelion passage; later a few prediscovery measurements going back to 16 January 2017 were found. This comet was last seen on 31 October 2019.
Solution given here is based on data span over 2.79 yr in the range of heliocentric distances from: 6.08 au – 5.12 au (perihelion) – 6.69 au.
This Oort spike comet suffers small planetary perturbations during its passage through the planetary system that lead to a more tight future orbit (see future barycentric orbit).
Solution given here is based on data span over 2.79 yr in the range of heliocentric distances from: 6.08 au – 5.12 au (perihelion) – 6.69 au.
This Oort spike comet suffers small 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 | 320 | |
| data interval | 2017 01 16 – 2019 10 31 | |
| data type | perihelion within the observation arc (FULL) | |
| data arc selection | entire data set (STD) | |
| range of heliocentric distances | 6.08 au – 5.12 au (perihelion) – 6.69 au | |
| detectability of NG effects in the comet's motion | NG effects not determinable | |
| type of model of motion | GR - gravitational orbit | |
| data weighting | YES | |
| number of residuals | 634 | |
| RMS [arcseconds] | 0.41 | |
| orbit quality class | 1a+ | |
| orbital elements (barycentric ecliptic J2000) | ||
|---|---|---|
| Epoch | 1710 05 17 | |
| perihelion date | 2018 03 31.09429367 | ± 0.00034957 |
| perihelion distance [au] | 5.12633456 | ± 0.00000259 |
| eccentricity | 0.99893213 | ± 0.00000349 |
| argument of perihelion [°] | 68.225912 | ± 0.000055 |
| ascending node [°] | 133.077259 | ± 0.000040 |
| inclination [°] | 162.45347 | ± 0.000006 |
| reciprocal semi-major axis [10-6 au-1] | 208.31 | ± 0.68 |
| file containing 5001 VCs swarm |
|---|
| 2018b1a5.bmi |
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).
Six 2D-projections of the 6D space of original swarm including 5001 VCs. Each density map is given in logarithmic scale presented on the right in the individual panel.