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 (heliocentric ecliptic J2000)
Epoch 2012 06 02
perihelion date 2012 06 03.93302412 ± 0.00339052
perihelion distance [au] 1.07139230 ± 0.00012267
eccentricity 1.00001790 ± 0.00003393
argument of perihelion [°] 287.840498 ± 0.005373
ascending node [°] 228.379853 ± 0.000023
inclination [°] 116.78103 ± 0.002558
reciprocal semi-major axis [10-6 au-1] -16.71 ± 31.66
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.