C/1925 G1 Orkisz
more info
Comet C/1925 G1 was discovered on 3 April 1925 by Lucjan Orkisz (Astronomical Observatory at Łysina, currently Lubomir, near Kraków, Poland), that is two days after perihelion passage, and the comet was last seen on 12 May 1926 [Kronk, Cometography: Volume 3].
This comet made its closest approach to the Earth on 6 May 1925 (1.476 au), that is about one month after its discovery.
Solution given here is based on data spanning over 1.07 yr in a range of heliocentric distances from 1.111 au to 5.062 au.
This Oort spike comet suffers moderate planetary perturbations during its passage through the planetary system that lead 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 this comet most probably is dynamically old.
More details in Królikowska et al. 2014.

solution description
number of observations 598
data interval 1925 04 05 – 1926 05 02
data type observed only after perihelion (POST)
data arc selection entire data set (STD)
range of heliocentric distances 1.11 au – 5.15au
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 964
RMS [arcseconds] 2.79
orbit quality class 1b
orbital elements (heliocentric ecliptic J2000)
Epoch 1925 03 31
perihelion date 1925 04 01.50657982 ± 0.00024031
perihelion distance [au] 1.10948315 ± 0.00000309
eccentricity 1.00060414 ± 0.00000642
argument of perihelion [°] 36.181542 ± 0.000283
ascending node [°] 319.109303 ± 0.000059
inclination [°] 100.022632 ± 0.00008
reciprocal semi-major axis [10-6 au-1] -544.52 ± 5.78
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.