C/1885 X1 Fabry
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C/1885 X1 was discovered on 1 December 1885 by Louis Fabry (Paris, France), about 5 months before its perihelion passage, and the comet was last seen on 30 July 1886 [Kronk, Cometography: Volume 2].
This comet made its closest approach to the Earth on 1 May 1886 (0.198 au), that is less than two weeks before perihelion passage.
Solutions given here are based on data spanning over 0.630 yr in a range of heliocentric distances from 2.29 au through perihelion (0.642 au) to 2.00 au.
This Oort spike comet suffers small planetary perturbations during its passage through the planetary system; these perturbations lead to escape the comet from the planetary zone on a hyperbolic orbit (see future barycentric orbits).
C/1885 X1 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.
See also Królikowska 2020.
This comet made its closest approach to the Earth on 1 May 1886 (0.198 au), that is less than two weeks before perihelion passage.
Solutions given here are based on data spanning over 0.630 yr in a range of heliocentric distances from 2.29 au through perihelion (0.642 au) to 2.00 au.
This Oort spike comet suffers small planetary perturbations during its passage through the planetary system; these perturbations lead to escape the comet from the planetary zone on a hyperbolic orbit (see future barycentric orbits).
C/1885 X1 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.
See also Królikowska 2020.
| solution description | ||
|---|---|---|
| number of observations | 217 | |
| data interval | 1885 12 01 – 1886 07 19 | |
| data type | perihelion within the observation arc (FULL) | |
| data arc selection | entire data set (STD) | |
| range of heliocentric distances | 2.29 au – 0.64 au (perihelion) – 2 au | |
| type of model of motion | NS - non-gravitational orbits for standard g(r) | |
| data weighting | YES | |
| number of residuals | 390 | |
| RMS [arcseconds] | 3.58 | |
| orbit quality class | 2a | |
| previous orbit statistics, both Galactic and stellar perturbations were taken into account | ||
|---|---|---|
| no. of returning VCs in the swarm | 4992 | * |
| no. of escaping VCs in the swarm | 9 | |
| no. of hyperbolas among escaping VCs in the swarm | 0 | |
| previous reciprocal semi-major axis [10-6 au-1] | 33.44 – 61.21 – 82.87 | R |
| previous perihelion distance [au] | 0.76 – 1.1 – 140 | R |
| previous aphelion distance [103 au] | 24 – 33 – 59 | R |
| time interval to previous perihelion [Myr] | 1.3 – 2.1 – 3.8 | R |
| percentage of VCs with qprev < 10 | 67 | |
| percentage of VCs with 10 < qprev < 20 | 3 | |
| percentage of VCs with qprev > 20 | 30 | |
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.
| previous orbit statistics, here only the Galactic tide has been included | ||
|---|---|---|
| no. of returning VCs in the swarm | 4984 | * |
| no. of escaping VCs in the swarm | 17 | |
| no. of hyperbolas among escaping VCs in the swarm | 1 | |
| previous reciprocal semi-major axis [10-6 au-1] | 39.32 – 61.13 – 82.77 | R |
| previous perihelion distance [au] | 0.71 – 0.94 – 4.4 | R |
| previous aphelion distance [103 au] | 24 – 33 – 51 | R |
| time interval to previous perihelion [Myr] | 1.3 – 2.1 – 4 | R |
| percentage of VCs with qprev < 10 | 94 | |
| percentage of VCs with 10 < qprev < 20 | 2 | |
| percentage of VCs with qprev > 20 | 4 | |