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 (heliocentric ecliptic J2000)
Epoch 2011 12 25
perihelion date 2011 12 06.85647186 ± 0.00150061
perihelion distance [au] 3.53656667 ± 0.00000712
eccentricity 1.00142339 ± 0.00001561
argument of perihelion [°] 50.736713 ± 0.000322
ascending node [°] 252.998269 ± 0.000064
inclination [°] 106.932238 ± 0.000012
recip semi-major axis [10-6 au-1] -402.48 ± 4.41
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