C/1886 T1 Barnard-Hartwig
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C/1886 T1 was discovered on 5 October 1886 by Edward Emerson Barnard (Vanderbilt University Observatory, Nashville, Tennessee, USA). Independently, it was discovered on 6 October byErnst Hartwig (Bamberg Observatory, Germany). At the moment of discovery, the comet was about 2.5 months before its perihelion passage and was last seen on 17 June 1887 [Kronk, Cometography: Volume 2].
This comet made its closest approach to the Earth on 5 December 1886 (0.965 au), that is over 3 weeks after perihelion passage.
Solutions given here are based on data spanning over 0.693 yr in a range of heliocentric distances from 1.50 au through perihelion (0.663 au) to 3.01 au.
This Oort spike comet suffers tiny planetary perturbations during its passage through the planetary system; these perturbations lead to a little bit larger future semimajor axis (see future barycentric orbits).
C/1886 T1 was in the original sample of 19 comets used by Oort for his hypothesis on LPCs; however, according to presented here statistics for previous perihelion passage, dynamical status of this comet is uncertain.
See also Królikowska 2020.

solution description
number of observations 320
data interval 1886 10 07 – 1887 06 17
data type perihelion within the observation arc (FULL)
data arc selection entire data set (STD)
range of heliocentric distances 1.5 au – 0.66 au (perihelion) – 3.01 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 546
RMS [arcseconds] 3.80
orbit quality class 2a
orbital elements (barycentric ecliptic J2000)
Epoch 2184 09 08
perihelion date 1886 12 17.20493593 ± 0.00141791
perihelion distance [au] 0.66485367 ± 0.00000154
eccentricity 0.99998988 ± 0.00001356
argument of perihelion [°] 86.369486 ± 0.000275
ascending node [°] 139.070046 ± 0.000216
inclination [°] 101.647046 ± 0.000274
reciprocal semi-major axis [10-6 au-1] 15.22 ± 20.40
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.