C/1907 E1 Giacobini
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Comet C/1907 E1 was discovered on 9 March 1907 Michel Giacobini (Nice Observatory, France), that is ten days before its perihelion passage, and it was last seen on 26 February 1908 [Kronk, Cometography: Volume 3].
This comet made its closest approach to the Earth on 22 February 1907 (1.33 au), that is about two weeks before its discovery.
Solution given here is based on data spanning over 0.970 yr in a range of heliocentric distances from 2.055 au through perihelion (2.052 au) to 4.29 au.
This Oort spike comet suffers rather small planetary perturbations during its passage through the planetary system; however, they led to escape the comet from the planetary zone on a hyperbolic orbit (see future barycentric orbit)
This comet 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 its dynamical status is uncertain.
More details in Królikowska et al. 2014.

solution description
number of observations 178
data interval 1907 03 09 – 1908 02 26
data type significantly more measurements after perihelion (POST+)
data arc selection entire data set (STD)
range of heliocentric distances 2.05 au – 2.05 au (perihelion) – 4.29 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 296
RMS [arcseconds] 2.56
orbit quality class 2a
orbital elements (heliocentric ecliptic J2000)
Epoch 1907 03 09
perihelion date 1907 03 19.60694118 ± 0.00169016
perihelion distance [au] 2.05167901 ± 0.00001611
eccentricity 1.00099244 ± 0.00004395
argument of perihelion [°] 317.118563 ± 0.000810
ascending node [°] 98.484125 ± 0.000214
inclination [°] 141.659654 ± 0.000193
reciprocal semi-major axis [10-6 au-1] -483.72 ± 21.42
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.