C/1989 X1 Austin
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Comet C/1989 X1 was discovered on 6 December 1989 by Rodney R.D. Austin (New Plymouth, New Zealand), that is about 4 months before its perihelion passage. This comet was last observed in late June 1990.
Comet had its closest approach to the Earth on 25 May 1990 (0.237 au), about 1.5 month after perihelion passage.
Solutions given here are based on data spanning over 0.556 yr in a range of heliocentric distances: 2.44 au – 0.350 au (perihelion) – 1.74 au.
This Oort spike comet suffers moderate planetary perturbations during its passage through the planetary system; these perturbations lead to escape the comet on hyperbolic orbit from the planetary zone.
See also Królikowska 2014 and Królikowska 2020.
Comet had its closest approach to the Earth on 25 May 1990 (0.237 au), about 1.5 month after perihelion passage.
Solutions given here are based on data spanning over 0.556 yr in a range of heliocentric distances: 2.44 au – 0.350 au (perihelion) – 1.74 au.
This Oort spike comet suffers moderate planetary perturbations during its passage through the planetary system; these perturbations lead to escape the comet on hyperbolic orbit from the planetary zone.
See also Królikowska 2014 and Królikowska 2020.
| solution description | ||
|---|---|---|
| number of observations | 275 | |
| data interval | 1989 12 06 – 1990 06 27 | |
| data type | perihelion within the observation arc (FULL) | |
| data arc selection | entire data set (STD) | |
| range of heliocentric distances | 2.44 au – 0.35 au (perihelion) – 1.74 au | |
| type of model of motion | NS - non-gravitational orbits for standard g(r) | |
| data weighting | YES | |
| number of residuals | 537 | |
| RMS [arcseconds] | 1.28 | |
| orbit quality class | 1b | |
| previous orbit statistics, both Galactic and stellar perturbations were taken into account | ||
|---|---|---|
| no. of returning VCs in the swarm | 4987 | * |
| no. of escaping VCs in the swarm | 14 | |
| no. of hyperbolas among escaping VCs in the swarm | 0 | |
| previous reciprocal semi-major axis [10-6 au-1] | 27.86 – 37.88 – 42.19 | R |
| previous perihelion distance [au] | 65 – 740 – 1900 | R |
| previous aphelion distance [103 au] | 47.1 – 52 – 69.8 | R |
| time interval to previous perihelion [Myr] | 2.6 – 3.7 – 6.1 | R |
| percentage of VCs with qprev < 10 | 8 | |
| percentage of VCs with qprev > 20 | 92 | |
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 | 4974 | * |
| no. of escaping VCs in the swarm | 27 | |
| no. of hyperbolas among escaping VCs in the swarm | 0 | |
| previous reciprocal semi-major axis [10-6 au-1] | 28.27 – 40.70 – 53.30 | R |
| previous perihelion distance [au] | 1.8 – 6.4 – 53 | R |
| previous aphelion distance [103 au] | 38 – 49 – 71 | R |
| time interval to previous perihelion [Myr] | 2.6 – 3.8 – 6.5 | R |
| percentage of VCs with qprev < 10 | 63 | |
| percentage of VCs with 10 < qprev < 20 | 15 | |
| percentage of VCs with qprev > 20 | 22 | |