C/2011 N2 McNaught
more info
Comet C/2011 N2 was discovered on 4 July 2011 by Robert H. McNaught (Siding Spring), that is 3.5 months before its perihelion passage. It was observed until 19 September 2011.
Comet had its closest approach to the Earth on 8 June 2011 (2.120 au), about a month before its discovery.
Solution given here is based on pre-perihelion data spanning over 0.194 yr in a range of heliocentric distances from 2.80 au to 2.59 au.
Original value of 1/a is negative; however within its uncertainty of 1 sigma this comet can came from the Oort Cloud.
C/2011 N2 was observed only before peryhelion; however, the future orbit is given here.
See also Królikowska 2020.

solution description
number of observations 48
data interval 2011 07 04 – 2011 09 13
data type observed only before perihelion (PRE)
data arc selection entire data set (STD)
range of heliocentric distances 2.8 au – 2.59au
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 92
RMS [arcseconds] 0.37
orbit quality class 2b
orbital elements (heliocentric ecliptic J2000)
Epoch 2011 10 06
perihelion date 2011 10 18.74595861 ± 0.00490596
perihelion distance [au] 2.56333607 ± 0.00005656
eccentricity 0.99959199 ± 0.00013415
argument of perihelion [°] 357.042726 ± 0.001734
ascending node [°] 274.018674 ± 0.000730
inclination [°] 33.675813 ± 0.00046
recip semi-major axis [10-6 au-1] 159.17 ± 52.34
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