C/2016 A1 PANSTARRS
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Comet C/2016 A1 was discovered on 1 January 2016 with Pan-STARRS 1 telescope (Haleakala), that is about almost 2 yr before its perihelion passage, and was next observed until 15 February 2020.
Comet had its closest approach to the Earth on 17 January 2018 (4.397 au); about 2 months after its perihelion passage.
Solutions given here are based on data spanning over 4.12 yr in a range of heliocentric distances: 7.31 au 5.328 au (perihelion) – 7.90 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).
See also Królikowska and Dones 2023.
Comet had its closest approach to the Earth on 17 January 2018 (4.397 au); about 2 months after its perihelion passage.
Solutions given here are based on data spanning over 4.12 yr in a range of heliocentric distances: 7.31 au 5.328 au (perihelion) – 7.90 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).
See also Królikowska and Dones 2023.
| solution description | ||
|---|---|---|
| number of observations | 1195 | |
| data interval | 2017 11 26 – 2020 02 15 | |
| data arc selection | data generally limited to post-perihelion (POS) | |
| range of heliocentric distances | 5.33 au – 7.9au | |
| 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 | 3212 | |
| RMS [arcseconds] | 0.39 | |
| orbit quality class | 1a+ | |
| orbital elements (barycentric ecliptic J2000) | ||
|---|---|---|
| Epoch | 2325 03 14 | |
| perihelion date | 2017 11 22.56184556 | ± 0.00047163 |
| perihelion distance [au] | 5.32986854 | ± 0.00000243 |
| eccentricity | 0.99930325 | ± 0.00000276 |
| argument of perihelion [°] | 10.189611 | ± 0.000057 |
| ascending node [°] | 128.129479 | ± 0.000006 |
| inclination [°] | 121.19926 | ± 0.000009 |
| reciprocal semi-major axis [10-6 au-1] | 130.73 | ± 0.52 |
| file containing 5001 VCs swarm |
|---|
| 2016a1ra.bpl |
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 future swarm including 5001 VCs. Each density map is given in logarithmic scale presented on the right in the individual panel.