C/2016 N4 Master
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Comet C/2016 N4 was discovered on 15 July 2016 with Mobile Astronomical System of the Telescope-Robots (MASTER), that is about months after its perihelion passage.
Some prediscovery images of this comet were found: taken on 11 September 2015 by ISON-SSO Observatory (Siding Spring).
Solutions given here are based on data spanning over 4.54 yr in a range of heliocentric distances: 7.14 au – 3.199 au (perihelion) – 8.37 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 | 1030 | |
| data interval | 2015 09 11 – 2017 09 16 | |
| data arc selection | data generally limited to pre-perihelion (PRE) | |
| range of heliocentric distances | 7.14 au – 3.20 au (perihelion) – 3.2 au | |
| type of model of motion | NH - non-gravitational orbits for water sublimation from subsolar point | |
| data weighting | YES | |
| number of residuals | 2031 | |
| RMS [arcseconds] | 0.33 | |
| orbit quality class | 1a | |
| orbital elements (heliocentric ecliptic J2000) | ||
|---|---|---|
| Epoch | 2017 09 04 | |
| perihelion date | 2017 09 16.60228257 | ± 0.00131320 |
| perihelion distance [au] | 3.19908927 | ± 0.00000470 |
| eccentricity | 0.99931656 | ± 0.00001255 |
| argument of perihelion [°] | 55.956193 | ± 0.000306 |
| ascending node [°] | 354.031713 | ± 0.000047 |
| inclination [°] | 72.557589 | ± 0.000036 |
| reciprocal semi-major axis [10-6 au-1] | 213.64 | ± 3.92 |
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] | 0.92426 | ± 0.34611 |
| A2 [10-8au/day2] | -2.0625 | ± 0.5776 |
| A3 [10-8au/day2] | 1.2609 | ± 0.1953 |
| m | -2.00 | |
| n | 3.000 | |
| k | -2,752.4000 | |
| r0 [au] | 50.000 | |
| α | 0.0003 | |