C/2010 X1 Elenin
more info
Comet C/2010 X1 was discovered on 10 December 2010 by Leonid Elenin (Lyubertsy, Russia); that is about 9 months before its perihelion passage. This comet was observed until 1 September 2011; however it started to disintegrate in August.
The deepest approach to the Earth would be on 16 October 2011 (0.233 au), about a month after its perihelion passage.
The solution based on observations taken to the end of July/June/May exhibits some trends in O-C time variation. Therefore, the preferred solution given here is based on data taken before 1 May and spanning over 0.394 yr in a range of heliocentric distances from 4.22 auto 2.47 au.
This was an Oort spike comet.

See also Królikowska and Dybczyński 2013, Sekanina 2019, and Królikowska 2020.

solution description
number of observations 2248
data interval 2010 12 10 – 2011 07 31
data arc selection data generally limited to pre-perihelion (PRE)
range of heliocentric distances 4.22 au – 1.04au
detectability of NG effects in the comet's motion comet lost close to perihelion or split comet
type of model of motion GR - gravitational orbit
data weighting YES
number of residuals 4438
RMS [arcseconds] 0.47
orbit quality class 1b
orbital elements (barycentric ecliptic J2000)
Epoch 1714 02 05
perihelion date 2011 09 11.57933076 ± 0.00017198
perihelion distance [au] 0.48158827 ± 0.00000116
eccentricity 0.99998609 ± 0.00000079
argument of perihelion [°] 343.653923 ± 0.000425
ascending node [°] 323.416603 ± 0.000429
inclination [°] 1.876268 ± 0.000022
reciprocal semi-major axis [10-6 au-1] 28.89 ± 1.64
file containing 5001 VCs swarm
2010x1a5.bmi
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 original swarm including 5001 VCs. Each density map is given in logarithmic scale presented on the right in the individual panel.