C/1925 G1

Solar System
Dynamics &
Planetology
Group

C/1925 G1 Orkisz

General description

Comet C/1925 G1 was discovered on 3 April 1925, that is two days after perihelion passage, and 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 below is based on data span over 1.07 yr in a range of heliocentric distances from 1.111 au to 5.062 au.

Comet suffered moderate planetary perturbations during its passage through the planetary system that led to escape the comet from the planetary zone on a hiperbolic orbit (see future barycentric orbit given below).

This comet was in the original sample of 19 comets used by Oort for his hypothesis on LPCs.

More details in Królikowska et al. 2014

Figure caption: 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.

SSDP Cometary Note C1925G1A6-001

Comet C/1925 G1 Orkisz

number of observations	598
number of residuals	964
data interval	1925 Apr. 5 — 1926 May 2
rms [arcsec]	2.79
orbit quality class	1b

Osculating orbital elements (heliocentric; ecliptic J2000.0)

Epoch (TT)	19250331.0	= JD 2424240.5
time of perihelion passage (TT)	19250401.506580	± 0.000240
perihelion distance	1.10948315	± 0.00000309
eccentricity	1.00060414	± 0.00000642
argument of perihelion [deg]	36.181542	± 0.000283
longitude of the ascending node [deg]	319.109303	± 0.000059
inclination [deg]	100.022632	± 0.000080
inverse semimajor axis [10^-6 au^-1]	-544.52	± 5.78

Note: Epoch is given in a format: yyyymmdd.d, time of perihelion passage in a format of yyyymmdd.dddddd.

Figure caption: Six 2D-projections of the 6D space of original swarm (5001 VCs) of C/1925 G1. Each density map is given in logarithmic scale presented on the right in the individual panel.
The same figure in the new window

Original orbital elements (barycentric; at 250 au from the Sun)

Epoch (TT)	16260626
time of perihelion passage (TT)	19250331.956264	± 0.000268
perihelion distance	1.10542489	± 0.00000304
eccentricity	0.99995575	± 0.00000635
argument of perihelion [deg]	36.344786	± 0.000283
longitude of the ascending node [deg]	319.188844	± 0.000060
inclination [deg]	100.089542	± 0.000081
inverse semimajor axis [10^-6 au^-1]	40.03	± 5.74

Note: Values of uncertainties of original/future orbital elements were derived using a swarm of 5001 osculating orbits of VCs (including the nominal osculating orbit given above) for original/future orbital evolution calclulations and then by fitting the distribution of a given orbital element of original/future swarm of VCs to Gaussian distribution.

Original barycentric positions and velocities of 5001 VCs at 250 au from the Sun are given here (data format), i.e. before entering the planetary zone.

Figure caption: Six 2D-projections of the 6D space of future swarm (5001 VCs) of C/1925 G1. Each density map is given in logarithmic scale presented on the right in the individual panel.
The same figure in the new window

Future orbital elements (barycentric; at 250 au from the Sun)

Epoch (TT)	22171006
time of perihelion passage (TT)	19250401.599089	± 0.000224
perihelion distance	1.10790258	± 0.00000311
eccentricity	1.00058995	± 0.00000637
argument of perihelion [deg]	36.149443	± 0.000282
longitude of the ascending node [deg]	319.121445	± 0.000059
inclination [deg]	99.886189	± 0.000081
inverse semimajor axis [10^-6 au^-1]	-532.49	± 5.74