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 1045
data interval 2017 09 16 – 2020 03 26
data arc selection data generally limited to post-perihelion (POS)
range of heliocentric distances 3.2 au – 3.20 au (perihelion) – 8.37 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 2065
RMS [arcseconds] 0.44
orbit quality class 1a+
next orbit statistics, both Galactic and stellar perturbations were taken into account
no. of returning VCs in the swarm 5001 *
no. of escaping VCs in the swarm 0
no. of hyperbolas among escaping VCs in the swarm 0
next reciprocal semi-major axis [10-6 au-1] 228.37 – 229.02 – 229.66
next perihelion distance [au] 3.19636 – 3.19639 – 3.19642
next aphelion distance [103 au] 8.705 – 8.73 – 8.754
time interval to next perihelion [Myr] 0.2868 – 0.2881 – 0.2893
percentage of VCs with qnext < 10100
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).
next orbit statistics, here only the Galactic tide has been included
no. of returning VCs in the swarm 5001 *
no. of escaping VCs in the swarm 0
no. of hyperbolas among escaping VCs in the swarm 0
next reciprocal semi-major axis [10-6 au-1] 228.38 – 229.02 – 229.67
next perihelion distance [au] 3.20522 – 3.20526 – 3.2053
next aphelion distance [103 au] 8.705 – 8.729 – 8.754
time interval to next perihelion [Myr] 0.2868 – 0.288 – 0.2893
percentage of VCs with qnext < 10100