C/1993 A1 Mueller
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Comet C/1993 A1 was discovered on 2 January 1993 by Jean Mueller (Palomar Sky Survey II). Later, a prediscovery image of this comet taken on 26 November 1992 (Catalina Station, Tucson) was found.At the moment of discovery, this comet was a year before its perihelion passage and it was last observed in the mid-August 1994.
Comet had its closest approach to the Earth on 13 November 1993 (1.713 au), 2 months before its perihelion passage.
This is a comet with nongravitational effects strongly manifested in positional data fitting.
Preferred solution given here is based on data spanning over 1.72 yr in a range of heliocentric distances: 4.89 au – 1.94 au (perihelion) – 3.19 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 2020.
Comet had its closest approach to the Earth on 13 November 1993 (1.713 au), 2 months before its perihelion passage.
This is a comet with nongravitational effects strongly manifested in positional data fitting.
Preferred solution given here is based on data spanning over 1.72 yr in a range of heliocentric distances: 4.89 au – 1.94 au (perihelion) – 3.19 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 2020.
| solution description | ||
|---|---|---|
| number of observations | 658 | |
| data interval | 1992 11 26 – 1994 01 08 | |
| data arc selection | data generally limited to pre-perihelion (PRE) | |
| range of heliocentric distances | 4.89 au – 1.94au | |
| type of model of motion | NC - non-gravitational orbits for symmetric CO-g(r)-like function | |
| data weighting | YES | |
| number of residuals | 1306 | |
| RMS [arcseconds] | 1.15 | |
| orbit quality class | 1a | |
| orbital elements (barycentric ecliptic J2000) | ||
|---|---|---|
| Epoch | 1694 05 20 | |
| perihelion date | 1994 01 13.83940039 | ± 0.00384286 |
| perihelion distance [au] | 1.94247911 | ± 0.00002889 |
| eccentricity | 1.00001865 | ± 0.00002038 |
| argument of perihelion [°] | 130.671299 | ± 0.001134 |
| ascending node [°] | 144.724243 | ± 0.000124 |
| inclination [°] | 124.971137 | ± 0.000179 |
| reciprocal semi-major axis [10-6 au-1] | -9.60 | ± 10.49 |
| file containing 5001 VCs swarm |
|---|
| 1993a1pc.bmi |
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.
Six 2D-projections of the 6D space of original swarm including 5001 VCs. Each density map is given in logarithmic scale presented on the right in the individual panel.