C/2013 E1 McNaught
more info
Comet C/2013 E1 was discovered on 4 March 2013 by Robert H. McNaught (Siding Spring), that is about 3 months before its perihelion passage. Next, it was found on earlier images taken on 2 and 19 April 2012 and 16 May 2012 with the Siding Spring Survey.
Comet had its closest approach to the Earth on 28 March 2013 (6.848 au, 2.5 months before perihelion passage, see figure).
Solution given here is based on 2-yr observations taken in a range of heliocentric distances: 8.23 au – 7.782 au (perihelion) – 7.99 au.
This Oort spike comet suffers a very slight planetary perturbations during its passage through the planetary system.
See also Królikowska and Dybczyński 2017.

solution description
number of observations 176
data interval 2012 04 02 – 2014 03 30
data type perihelion within the observation arc (FULL)
data arc selection entire data set (STD)
range of heliocentric distances 8.23 au – 7.78 au (perihelion) – 7.99 au
detectability of NG effects in the comet's motion NG effects not determinable
type of model of motion GR - gravitational orbit
data weighting YES
number of residuals 337
RMS [arcseconds] 0.39
orbit quality class 1a
orbital elements (heliocentric ecliptic J2000)
Epoch 2013 05 28
perihelion date 2013 06 12.11206938 ± 0.00520503
perihelion distance [au] 7.78161530 ± 0.00001479
eccentricity 1.00232317 ± 0.00001157
argument of perihelion [°] 311.424878 ± 0.000340
ascending node [°] 134.028198 ± 0.000086
inclination [°] 158.720554 ± 0.000028
recip semi-major axis [10-6 au-1] -298.55 ± 1.48
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