C/2015 O1 PANSTARRS
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Comet C/2015 O1 was discovered on 19 July 2015 with Pan-STARRS 1 telescope (Haleakala), that is about months after its perihelion passage.
Some prediscovery images of this comet were found: taken on 15 and 17 of June 2015 by Space Surveillance Telescope (Atom Site).
Solutions given here are based on data spanning over 4.76 yr in a range of heliocentric distances: 8.65 au – 3.730 au (perihelion) – 7.28 au.
NG orbits using full data-arc as well as independently using pre-perihelion and post-perihelion data are determinable.
See also Królikowska and Dones 2023.
| solution description | ||
|---|---|---|
| number of observations | 4142 | |
| data interval | 2015 06 15 – 2020 03 20 | |
| data type | perihelion within the observation arc (FULL) | |
| data arc selection | entire data set (STD) | |
| range of heliocentric distances | 8.65 au – 3.73 au (perihelion) – 7.28 au | |
| type of model of motion | NS - non-gravitational orbits for standard g(r) | |
| data weighting | YES | |
| number of residuals | 8242 | |
| RMS [arcseconds] | 0.51 | |
| orbit quality class | 1a+ | |
| orbital elements (heliocentric ecliptic J2000) | ||
|---|---|---|
| Epoch | 2018 03 23 | |
| perihelion date | 2018 02 19.03341719 | ± 0.00006314 |
| perihelion distance [au] | 3.72964179 | ± 0.00000088 |
| eccentricity | 0.99996438 | ± 0.00000120 |
| argument of perihelion [°] | 89.595650 | ± 0.000013 |
| ascending node [°] | 299.857498 | ± 0.000004 |
| inclination [°] | 127.210995 | ± 0.000004 |
| reciprocal semi-major axis [10-6 au-1] | 9.55 | ± 0.32 |
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] | 13081 | ± 106 |
| A2 [10-8au/day2] | -3506 | ± 85.5 |
| A3 [10-8au/day2] | 1065.1 | ± 33.6 |
| m | -2.15 | |
| n | 5.093 | |
| k | -4.6142 | |
| r0 [au] | 2.808 | |
| α | 0.1113 | |