C/2015 B2 PANSTARRS
more info
Comet C/2015 B2 was discovered on 29 January 2015 with Pan-STARRS 1 telescope (Haleakala), that is about 1.3 yr before its perihelion passage; a few prediscovery images of this comet were found (taken on 6 January with the same survey). This comet was observed until 12 September 2017.
Comet had its closest approach to the Earth on 12 January 2016 (3.625 au), about 4 months before its perihelion passage.
Solution given here is based on data spanning over 2.68 yr in a range of heliocentric distances: 5.48 au – 3.370 au (perihelion) – 5.53 au.
This comet suffers tiny planetary perturbations during its passage through the planetary system; have orignal semimajor axis of about 4,400 au and slightly tighter future orbit (see future barycentric orbit).

solution description
number of observations 242
data interval 2015 01 06 – 2017 09 12
data type perihelion within the observation arc (FULL)
data arc selection entire data set (STD)
range of heliocentric distances 5.48 au – 3.37 au (perihelion) – 5.53 au
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 464
RMS [arcseconds] 0.23
orbit quality class 1a+
orbital elements (barycentric ecliptic J2000)
Epoch 2321 09 11
perihelion date 2016 05 07.29382158 ± 0.00007310
perihelion distance [au] 3.36846261 ± 0.00000030
eccentricity 0.99912683 ± 0.00000120
argument of perihelion [°] 284.735609 ± 0.000010
ascending node [°] 341.977754 ± 0.000005
inclination [°] 105.094611 ± 0.000006
reciprocal semi-major axis [10-6 au-1] 259.22 ± 0.36
file containing 5001 VCs swarm
2015b2a5.bpl
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.