C/2015 W1 Gibss
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Comet C/2015 W1 was discovered on 18 November 2015 by A.R. Gibbs (Catalina Sky Survey), that is half a year before its perihelion passage. Comet was followed until 3 July 2016. C/2015 V2 had closest approach to the Earth on 25 January 2016 (1.621 au, less than three months before the perihelion passage).
This is a comet with NG effects determinable using positional data fitting. Both solutions (GR and NG) are based on data spanning over 0.625 yr in a range of heliocentric distances: 3.01 au – 2.232 au (perihelion) – 2.30 au.
This Oort Cloud comet (GR orbit gives marginally Oort Cloud comet with original semimajor axis about 10,000 au whereas NG orbit – marginally hyperbolic) suffers moderate planetary perturbations during its passage through the planetary system; these perturbations lead to more tight future orbit, but predictions for GR and NG orbits are different (see future barycentric orbits).
This is a comet with NG effects determinable using positional data fitting. Both solutions (GR and NG) are based on data spanning over 0.625 yr in a range of heliocentric distances: 3.01 au – 2.232 au (perihelion) – 2.30 au.
This Oort Cloud comet (GR orbit gives marginally Oort Cloud comet with original semimajor axis about 10,000 au whereas NG orbit – marginally hyperbolic) suffers moderate planetary perturbations during its passage through the planetary system; these perturbations lead to more tight future orbit, but predictions for GR and NG orbits are different (see future barycentric orbits).
| solution description | ||
|---|---|---|
| number of observations | 356 | |
| data interval | 2015 11 18 – 2016 07 03 | |
| data type | observed only after perihelion (POST) | |
| data arc selection | entire data set (STD) | |
| range of heliocentric distances | 3.01 au – 2.23 au (perihelion) – 2.3 au | |
| type of model of motion | NS - non-gravitational orbits for standard g(r) | |
| data weighting | YES | |
| number of residuals | 695 | |
| RMS [arcseconds] | 0.44 | |
| orbit quality class | 1b | |
| orbital elements (heliocentric ecliptic J2000) | ||
|---|---|---|
| Epoch | 2016 05 12 | |
| perihelion date | 2016 05 17.12967021 | ± 0.00445246 |
| perihelion distance [au] | 2.23213335 | ± 0.00001654 |
| eccentricity | 1.00153990 | ± 0.00001632 |
| argument of perihelion [°] | 48.086445 | ± 0.001918 |
| ascending node [°] | 114.313190 | ± 0.000121 |
| inclination [°] | 87.317187 | ± 0.000165 |
| reciprocal semi-major axis [10-6 au-1] | -689.88 | ± 7.31 |
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).
| non-gravitational parameters | ||
|---|---|---|
| A1 [10-8au/day2] | 93.147 | ± 6.333 |
| A2 [10-8au/day2] | 20.587 | ± 2.016 |
| A3 [10-8au/day2] | -17.162 | ± 1.943 |
| m | -2.15 | |
| n | 5.093 | |
| k | -4.6142 | |
| r0 [au] | 2.808 | |
| α | 0.1113 | |