C/2012 B3 La Sagra
more info
Comet C/2012 B3 was discovered on 29 January 2012, that is about two months after perihelion passage, and next observed almost continuously 0.56 yr in a range of heliocentric distances from 3.57 au to 4.23 au.
Comet had its closest approach to the Earth on 24 March 2012 (3.436 au, almost two months after discovery, see figure).
This Oort spike comet suffers small planetary perturbations during its passage through the planetary system that lead to a more tight future orbit (see future barycentric orbit).
See also Królikowska and Dybczyński 2017.

solution description
number of observations 301
data interval 2012 01 29 – 2012 08 21
data type observed only after perihelion (POST)
data arc selection entire data set (STD)
range of heliocentric distances 3.57 au – 4.23au
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 589
RMS [arcseconds] 0.38
orbit quality class 1b
orbital elements (barycentric ecliptic J2000)
Epoch 2316 03 21
perihelion date 2011 12 07.12325962 ± 0.00150276
perihelion distance [au] 3.53814747 ± 0.00000729
eccentricity 0.99949879 ± 0.00001566
argument of perihelion [°] 50.737091 ± 0.000324
ascending node [°] 252.983956 ± 0.000064
inclination [°] 106.936866 ± 0.000013
reciprocal semi-major axis [10-6 au-1] 141.66 ± 4.43
file containing 5001 VCs swarm
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.