C/2015 XY1 Lemmon
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Comet C/2015 XY1 was discovered on 4 December 2015 with Mount Lemmon survey, that is about 2.4 yr before its perihelion passage, and was observed until 1 January 2020.
Comet had its closest approach to the Earth on 27 December 2017 (6.984 au); about 4 months before its perihelion passage.
Solutions given here are based on data spanning over 4.88 yr in a range of heliocentric distances from 9.52 au 7.928 au (perihelion) – 9.62 au.
This Oort spike comet suffers slight planetary perturbations during its passage through the planetary system; however, these perturbations can lead to escape the comet from the planetary zone on a marginally hyperbolic orbit (see future barycentric orbit for solution ra).
See also Królikowska and Dones 2023.
Comet had its closest approach to the Earth on 27 December 2017 (6.984 au); about 4 months before its perihelion passage.
Solutions given here are based on data spanning over 4.88 yr in a range of heliocentric distances from 9.52 au 7.928 au (perihelion) – 9.62 au.
This Oort spike comet suffers slight planetary perturbations during its passage through the planetary system; however, these perturbations can lead to escape the comet from the planetary zone on a marginally hyperbolic orbit (see future barycentric orbit for solution ra).
See also Królikowska and Dones 2023.
| solution description | ||
|---|---|---|
| number of observations | 415 | |
| data interval | 2015 12 04 – 2018 04 10 | |
| data arc selection | data generally limited to pre-perihelion (PRE) | |
| range of heliocentric distances | 9.52 au – 7.93au | |
| 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 | 816 | |
| RMS [arcseconds] | 0.33 | |
| orbit quality class | 1a+ | |
| orbital elements (barycentric ecliptic J2000) | ||
|---|---|---|
| Epoch | 1707 11 09 | |
| perihelion date | 2018 04 29.16368248 | ± 0.00208078 |
| perihelion distance [au] | 7.93548033 | ± 0.00000950 |
| eccentricity | 0.99976935 | ± 0.00000561 |
| argument of perihelion [°] | 196.230987 | ± 0.000135 |
| ascending node [°] | 281.553775 | ± 0.000010 |
| inclination [°] | 148.84195 | ± 0.000018 |
| reciprocal semi-major axis [10-6 au-1] | 29.07 | ± 0.71 |
| file containing 5001 VCs swarm |
|---|
| 2015xypa.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.