C/2011 U3 McNaught
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Comet C/2011 U3 was discovered on 24 October 2011 with Pan-STARRS 1 telescope (Haleakala), that is 7.5 months before its perihelion passage. It was observed until 26 January 2012.
Comet had its closest observed approach to the Earth on 3 December 2011 (2.002 au), more than a month after its discovery. If C/2011 U3 survived its perihelion passage it passed 0.814 au from the Earth on 24 June 2012.
Solution given here is based on pre-perihelion data spanning over 0.257 yr in a range of heliocentric distances from 3.31 au to 2.24 au.
This Oort spike comet suffered moderate planetary perturbations during its passage through the inner part of our planetary system.
C/2011 U3 was observed only before peryhelion; however, the future orbit is given here.
See also Królikowska 2020.

solution description
number of observations 57
data interval 2011 10 24 – 2012 01 26
data type observed only before perihelion (PRE)
data arc selection entire data set (STD)
range of heliocentric distances 3.31 au – 2.24au
detectability of NG effects in the comet's motion NG effects not determinable
type of model of motion GR - gravitational orbit
data weighting NO
number of residuals 114
RMS [arcseconds] 0.40
orbit quality class 2a
orbital elements (barycentric ecliptic J2000)
Epoch 2316 04 30
perihelion date 2012 06 04.27873223 ± 0.00301633
perihelion distance [au] 1.07218408 ± 0.00012261
eccentricity 0.99948395 ± 0.00003399
argument of perihelion [°] 287.823525 ± 0.005409
ascending node [°] 228.410067 ± 0.000026
inclination [°] 116.761266 ± 0.002571
reciprocal semi-major axis [10-6 au-1] 481.31 ± 31.75
file containing 5001 VCs swarm
2011u3a5.bpl
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.
Six 2D-projections of the 6D space of future swarm including 5001 VCs. Each density map is given in logarithmic scale presented on the right in the individual panel.