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
detectability of NG effects in the comet's motion comet with determinable NG~orbit
type of model of motion GR - gravitational orbit
data weighting YES
number of residuals 2031
RMS [arcseconds] 0.35
orbit quality class 1a+
orbital elements (heliocentric ecliptic J2000)
Epoch 2017 09 04
perihelion date 2017 09 16.59857736 ± 0.00022200
perihelion distance [au] 3.19910799 ± 0.00000146
eccentricity 0.99937543 ± 0.00000175
argument of perihelion [°] 55.955506 ± 0.000051
ascending node [°] 354.031421 ± 0.000003
inclination [°] 72.55727 ± 0.000007
reciprocal semi-major axis [10-6 au-1] 195.23 ± 0.55
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).