C/2013 B2 Catalina
more info
Comet C/2013 B2 was discovered on 16 January 2013 during Catalina Sky Survey, that is 5.5 months before perihelion passage, and next observed 1.2 yr in a range of heliocentric distances: 4.01 au – 3.734 au (perihelion) – 4.43 au.
C/2013 B2 had its closest approach to the Earth on 23 January 2013 (3.251 au, one week 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 also Królikowska and Dybczyński 2017.

solution description
number of observations 132
data interval 2013 01 16 – 2014 03 30
data type perihelion within the observation arc (FULL)
data arc selection entire data set (STD)
range of heliocentric distances 4.01 au – 3.73 au (perihelion) – 4.43 au
type of model of motion NS - non-gravitational orbits for standard g(r)
data weighting YES
number of residuals 260
RMS [arcseconds] 0.29
orbit quality class 1a
orbital elements (heliocentric ecliptic J2000)
Epoch 2013 07 07
perihelion date 2013 07 01.53762655 ± 0.00189123
perihelion distance [au] 3.73413270 ± 0.00000595
eccentricity 1.00261361 ± 0.00001156
argument of perihelion [°] 156.438198 ± 0.000358
ascending node [°] 331.957131 ± 0.000038
inclination [°] 43.457148 ± 0.000027
recip semi-major axis [10-6 au-1] -699.92 ± 3.09
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
non-gravitational parameters
A1 [10-8au/day2] 403 ± 1978
A2 [10-8au/day2] 7577 ± 1582
A3 [10-8au/day2] 0 (assumed)
m -2.15
n 5.093
k -4.6142
r0 [au] 2.808
α 0.1113